Talk:Sewage treatment

message: From "Sewage treatment in developing countries" (http://en.wikipedia.org/wiki/Sewage_treatment#Sewage_treatment_in_developing_countries):
"Developing countries as diverse as Egypt, Algeria, China or Colombia have invested substantial sums in wastewater treatment without achieving a significant impact in terms of environmental improvement. Even if wastewater treatment plants are not properly operated, it can be argued that the environmental impact is limited in cases where the assimilative capacity of the receiving waters (ocean with strong currents or large rivers) is high, as it is often the case."
This paragraph is highly questionable and I am going to remove those lines until somebody finds a reliable source to proof this statement.  —Preceding unsigned comment added by 141.65.4.56 (talk) 13:03, 16 March 2010 (UTC)
replies: text: Agreed.  This argument is typically based upon statistical comparison of traditional physical-chemical analyses including biochemical oxygen demand, total suspended solids, turbidity, and dissolved oxygen.  There are at least two other broad categories to be considered.  The first is bacterial and viral pathogens.  Water quality has traditionally been assessed with coliform counts, but coliform organisms live in such a wide variety of hosts that high background levels from birds, rodents, and domestic livestock and pets may mask true sewage plumes.  Measurement of true pathogen counts is comparatively seldom undertaken, and assumptions of coincidence with receiving water coliform counts are questionable.  Another emerging issue is the significance of enzymatically active substances capable of causing biological changes at unmeasurably low concentrations.  These situations were first identified with industrial wastes like polychlorinated dibenzodioxins (potentially present in bleached toilet paper), but can also result from hormones or pharmaceutical drug residues in human urine and feces.  Estrogen levels from oral contraceptives or menopause therapy may be high enough to impede sexual development of fish, amphibians, crustaceans, or insects maturing in receiving waters.Thewellman (talk) 20:07, 16 March 2010 (UTC)
thread_title: Environmental impact

message: I've noticed that the sequence in which each part of the sewage works process is in a specific sequence, as if it were saying "this is the order in which the seperate processes occur", but this is in fact incorrect as each plant arranges their process in a slightly different way, with slightly different methods employed at each stage. There are so many different ways of arranging plants, each with their own benefits and reasons, that it seems incomplete without at least mentioning this and going into some detail on it.
I propose that, rather than going through the process step by step (which is going to be incorrect the second you start looking at a different plant, as the author seems to've taken his information from one specific plant in Wales), processes used on most sites should be described individually, each with a little footnote on what part of the whole treatment process it's usually used in, to give the reader a general overall understanding of the methods employed and the common application of those methods.
At the end of the article, with the reader now fully knowledgeable of what components can make up a sewage treatment plant, there can be an expansion on the structuring and arrangement of components of a sewage works, and their relative merits. There seems to be a lot of potential knowledge to be shared on what factors into decisions on how sewage works are structured. If this is not possible, then at least a few of the most common arrangements, and then a description of the variables that determine what methods are used where would be desireable. There are so few constants in the world of sewage treatment, that it would be impossible to structure one article around a "typical" sewage works, because such a sewage works does not exist.--Badharlick 17:10, 10 April 2006 (UTC)
replies: text: I did respond but Wikipedia obliterated my response. I tried to say that, you make exactly my point. There are many sorts of novel and INTERESTING ways - please give me a reason why these shouldn't be added to the article? I'm not critising the work that you've done, more the work that hasn't been done. There's lots and lots of information that can be added here, and just because you "don't think it's important for the public to know" doesn't mean it shouldn't be added. There's whole processes, equipment, methods, equipment names, and various other things that aren't listed in the article that are actually really quite important if you're even semiserious about the subject. What about hydroseperators? Different types of hydroseperators for different purposes? The difference between a settling tank and a hydroseperator and their relative merits? Different types of drying equipment? --Badharlick 19:35, 13 April 2006 (UTC)
thread_title: Process Sequence

message: I added little bit on historical section, but it is far from being enough.
* Historical section is still too limiting.
* "Modern sewage treatment" is mixed with laws, problems, and systems for sewage treatments.  It should be splitted into different sections.
* This can mention how sewage are treated inside factories, which is mostly due to regulations.
* The incineration of sewage can be quite safe as long as the industrial waste water that causes most problems is separated.
Revth 09:55, 23 Sep 2004 (UTC)
thread_title: Structure

message: :In many other countries, including many quite-wealthy ones, untreated sewage is released directly to surface water.
Which wealthy countries release untreated sewage to surface water? Burschik 10:00, 23 Sep 2004 (UTC)
replies: text: Stupid ones? --ZayZayEM 04:44, 9 Nov 2004 (UTC)

text: Brussels didn't have a WWTP until 2001; ironic given the importance of EU legislation in driving forward WWT in Europe... Rd232 15:58, 5 Jan 2005 (UTC)
replies: text: i belive its accepted wisdom that its better to dump raw sewage into rivers etc than to let it back up in the pipes causing all manor of problems. So when treatment fails thats what happens! Plugwash 00:17, 14 March 2006 (UTC)
thread_title: Untreated sewage disposal

message: Primary, secondary, and tertiary treatment all have time-tested definitions in the United States.  I'm not an expert on this specific topic per se but do work in the industry, and would like to see the definitions conform more to current standards and practices.  I can work on this if nobody else is willing to, but like I said, I don't run a treatment plant or anything....
I have provided some updates to treament methods but it is still North American flavoured. Much remains to be done and I an unhappy about some of the statements about the lack of environmental impacts for sewage discaring into high dilution systems. All the evidence demoinstrates  that the impacts can be severe.
Velela 18:34, 23 Nov 2004 (UTC)
thread_title:  Treatment 

message: I'm working on an article about constructed wetlands; one primary use for them is wastewater and sewage treatment. I've linked back here, but I'm not sure how much detail I should go into on how they function as wastewater treatment systems. At the moment, I'm working on a description of their design for different purposes and plan to provide examples. Any suggestions? Deirdre 00:52, 9 Dec 2004 (UTC)
thread_title:  constructed wetlands question 

message: Is 'Sewerage' not a more appropriate title for any article on sewers, pumps, etc?  In my experience, the word 'sewers' refers exclusively to pipes, and not the other components of sewerage such as pumping stations.  Sewer could then be used to refer to sewage pipe history/technology/usage which is a significant field in its own right, while sewerage could describe or link to sewage pumps, pumping stations, and network design.  I would be happy to contribute.
I agree that in British usage, sewerage refers to and includes all that infrastructure used to convey sewage from its origin to the point of disposal and therefore includes pipes, valves, pumps, screens etc. I would be happy to see this separated out and included in a linked articlee provided that there is a similar usage in other English speaking countries. Does the word 'sewerage' have the same meaning in the USA and Canada ? I believe that it does in Australia and NZ.
Velela 14:23, 18 Dec 2004 (UTC)
thread_title:  sewerage 

message: Is there a nice way to clean up the "Lagooning", "Pressing", etc list?  It doesn't read well, but since I can't even figure out if they're supposed to be subsections or separate sections, don't want to mess with it...  --Bushytails 04:44, 24 Jan 2005 (UTC)
thread_title:  Formatting 

message: The article includes lists of "Possible Equipment" that I do not recognize. I have been a water professional for over 30 years and do try to keep up. I suspect that there may be brand names mixed in. I feel that an encyclopedia article should not include these in the main treatment article, although notable companies could have references and articles. For example, "belt press" and "vacuum filter" are types of dewatering equipment, but including Andritz or Roediger would be inappropriate since those are manufacturers. -- WCFrancis 17:39, 8 September 2005 (UTC)
replies: text: I'm in the same boat since I've worked in the water and waste water treatment fields as well.  A link to the articles on those devices which themselves contain a list of brands (inclusive, not just one or two but most or all manufacturers) would probably be more acceptable.  2601:1:9280:155:E1CA:5ABE:F2A2:BCEA (talk) 06:45, 15 April 2014 (UTC)
thread_title:  Brand Names? 

message: The following was deleted by User:206.128.209.28 on April 8th - not clear as to why:
:For example, one process which combines secondary treatment and settlement is the Sequential Batch Reactor (SBR). Typically, activated sludge is mixed with raw incoming sewage and mixed and aerated. The resultant mixture is then allowed to settle producing a high quality effluent. The settled sludge is run off and re-aerated before a proportion is returned to the head of the works. SBR plants are now being deployed in many parts of the world including North Liberty, Iowa, and Llanasa, North Wales.  	 
:The disadvantage of such processes is that precise control of timing, mixing and aeration is required. This precision is usually achieved by computer controls linked to many sensors in the plant. Such a complex, fragile system is unsuited to places where such controls may be unreliable, or poorly maintained, or where the power supply may be intermittent.
posted: Paleorthid 16:15, 9 April 2006 (UTC)
thread_title:  Package plants and batch reactors 

message: The following was deleted by User:206.128.209.28 on April 8th - not clear as to why:
:Thermal depolymerization uses hydrous pyrolysis to convert reduced complex organics to oil. The premacerated, grit-reduced sludge is heated to 250C and compressed to 40 MPa. The hydrogen in the water inserts itself between chemical bonds in natural polymers such as fats, proteins and cellulose. The oxygen of the water combines with carbon, hydrogen and metals. The result is oil, light combustible gases such as methane, propane and butane, water with soluble salts, carbon dioxide, and a small residue of inert insoluble material that resembles powdered rock and char. All organisms and many organic toxins are destroyed. Inorganic salts such as nitrates and phosphates remain in the water after treatment at sufficiently high levels that further treatment is required. 	 
:The energy from decompressing the material is recovered, and the process heat and pressure is usually powered from the light combustible gases. The oil is usually treated further to make a refined useful light grade of oil, such as no. 2 diesel and no. 4 heating oil, and then sold. 	 
:The choice of a wastewater solid treatment method depends on the amount of solids generated and other site-specific conditions. However, in general, composting is most often applied to smaller-scale applications followed by aerobic digestion and then lastly anaerobic digestion for the larger-scale municipal applications.
Posted: Paleorthid 16:15, 9 April 2006 (UTC)
replies: text: I couldn't see any reason for deletion so I have restored the missing text. Velela 08:22, 10 April 2006 (UTC)
thread_title: Thermal depolymerization

message: In addition to correct a mistake in the definition of "mesophilic" and "thermophilic", I deleted the reference to large tanks were sludge is supposed to be left for weeks in anaerobic conditions. I don't really understand what the original writer is talking about, as non-heated closed anaerobic digesters would have a huge, anti-economic, size and would only be possible were incoming sewage temperature would be high enough to allow this. Kekel 11:41, 29 June 2006 (UTC)
replies: text: Fermentation is a part of anaerobic digestion, namely Mixed acid fermentation, as well as hydrolysis and methanogenesis. I dont mind using the term "fermented" since it's commonly understood, resonably correct and often used in non-technical literature to describe anaerobic digestion. Morphriz (talk) 09:34, 13 July 2010 (UTC)
thread_title: Anaerobic Digestion

message: To try and make this article a more manageable size, I have created a new article as a home for the sludge treatment and disposal topics. I have retained a precis here as an overview but have tried to avoid overt duplication between the two articles.  Velela 12:03, 5 July 2006 (UTC)
replies: text: PLEASE have a look at the talk page for Sewage sludge treatment. I have added much as to the methods of dewatering and disposal, as that section is very small and needs to be expanded. i think right now that is the only topic on the discussion page. JAK83 17:41, 5 February 2007 (UTC)
thread_title: [[Sewage sludge treatment]]

message: (I posted this to Talk:Catfish#Using catfish in septic tanks., but it is also of relevance here.) 
Catfish are used in septic tanks in Indonesia, to eat the waste and prevent the tank from filling up with solids too quickly. I can't find a valid source, so I'll just offer these links for now, and hope that someone comes up with a source. I might try and co-author a journal article on it next year, which would then be a valid source. 
Blog post (and comments): Ikan lele technology
My comment: An Indonesian's comment on catfish in septic tanks
The Indonesian Wikipedia article on catfish mentions that freshwater catfish are used to remove impurities from water; it states that catfish used in the way must be cleansed before eating, by being placed in flowing water. (The article doesn't state how long for, or just how much this improves the taste & safety). --Singkong2005 · talk 00:30, 31 October 2006 (UTC)
thread_title:  Using catfish in septic tanks 

message: I work at a 16MGD water reclamation facility, and would be happy to submit photos for the different processes, such as
-Influent Pumping
-Screening (mechanical bar screens)
-Degritting
-Aereation basins (oxidation ditch)
-Anerobic tanks
-Anoxic tanks
-Clarification (circular gravity clarifiers)
-Tertiary Filters (Rapid Sand Filters)
-UV Disinfection
-Effluent Pumping
-Sream Outfall
-Laboratory
-Aerobic Digesters
-Various Equipment (pumps, blowers, motors, etc)
-Power backup (turbo-diesel generators)
-Sludge Dewatering (belt filter presses, centrifuge)
You want a picture of it I can get it. JAK83 18:31, 5 February 2007 (UTC)
replies: text: Some additional images would greatly improve the article. Please go ahead. Only one caveat - most sewage in the world is actually treated in the many tens of thousands of small rural works so it would be good to maintain a balance and illustrate both large and small works  Velela 21:39, 5 February 2007 (UTC)
replies: text: I think I will wait until Spring when there is no snow and the grass is green... not a great time now to take outdoor pics, but i will post some of the indoor processes here on the talk page. JAK83 03:56, 10 February 2007 (UTC)
thread_title:  PHOTOS 

message: The section on "Sedimentation solidification and evaporation" refers to a piometre.  I can't find any information on what that is--could it be a typo?  
Ccrrccrr 01:41, 5 July 2007 (UTC)
thread_title:  piometre? 

message: In many countries strapped for water, it is necessary to recycle water from sewage treatment plants into either potable water, requiring high purity, or irrigation water, permitting a lower quality. I was rather surprised not to see either feature mentioned in this article, which is therefore incomplete. I don't have enough know-how to write a section, although I understand that single stage RO (much cheaper than desalination) plus UV irradiation is used for the former and ultrafiltration for the latter. Could anyone add this, please? --Devilinhell (talk) 07:30, 1 June 2008 (UTC)
thread_title:  Recycling water 

message: A friend of mine that worked in water treatment always use to point out what he called Primary Settlement Tanks or PST's when we went past sewage works. As far as I can see there isn't a direct reference to them in this artical.  Is that something that is missing?   
He was mainly refering to items like this:   62.189.100.228 (talk) 20:00, 5 February 2009 (UTC)
replies: text: Yes, they are there. See Sewage treatment#Sedimentation. Velela (talk) 20:12, 5 February 2009 (UTC)

text: Ah right, thanks.  Is the acronym 'PST' in wide spread enough use to include it?  At the moment i don't see it. 81.158.252.81 (talk) 14:36, 8 February 2009 (UTC)
replies: text: Never heard it used in the UK despite all my working life regulating sewage works. Possible it is used elsewhere. Velela (talk) 15:21, 8 February 2009 (UTC)
replies: text: During 2007 - 2009 I have worked as a consultant engineer in London for water and wastewater treatment works. My clients were Thames Water, Anglian Water and Scottish Water and the acronym PSTs for Primary Settlement Tanks was commonly used. Silenzio76 (talk) 00:16, 3 May 2010 (UTC)
thread_title:  PST's 

message: I have removed the following text from the article because it seems to make little sense to me as part of the sewage treatment process. If someone can re-draft it so that it make sense to the ordinary reader and assuming that it is still relevant to this article, it could then be re-inserted.
:The carbon absorption following biological treatment is particularly effective in reducing both the BOD and COD to low levels. A fluidized bed reactor is a combination of the most common stirred tank packed bed, continuous flow reactors. It is very important to chemical engineering because of its excellent heat and mass transfer characteristics. In a fluidized bed reactor, the substrate is passed upward through the immobilized enzyme bed at a high velocity to lift the particles. However the velocity must not be so high that the enzymes are swept away from the reactor entirely. This causes low mixing; these type of reactors are highly suitable for the exothermic reactions. It is most often applied in immobilized enzyme catalysis
Velela (talk) 11:20, 13 March 2009 (UTC)
thread_title:  Fluidized bed reactors 

message: I am a retired ChE with no sewage plant knowledge.  I found the article a good introduction; however, I would suggest adding a specific discussion of the process flow diagram shown in the article.  Its content does not relate directly to the text, resulting in unnecessary difficulty in understanding it.
Ugodit (talk) 01:16, 22 February 2010 (UTC)
thread_title:  Process Flow Diagram 

message: Such as soaps, detergents, and other chemicals used in the laundry room, kitchen, and bathroom?  —Preceding unsigned comment added by Consuelo D'Guiche (talk • contribs) 20:27, 18 May 2010 (UTC)
replies: text: Soaps are organic, as are most detergents and other laundry products - nearly all or which are either chemically bound into fats and greases and skimmed of the primary tank or are degraded biologically in a filter bed or activated sludge tank. Truly inorganic materials such as washing soda, caustic soda (for those really tough stains!), bleach, chlorinated solvents react with other components or evaporate off during the aeration stage. Alkaline materials tend to saponify fats producing soaps and glycerine; chlorine from bleach mostly oxidises organic components producing innocuous chloride ion. However; some difficult or potentially toxic materials do remain including small concentrations of halogenated organics, pharmaceutical residues, hormone residues, medical radio-isotopes etc. all of which, very greatly diluted, are discharged into the environment.  Velela  Velela Talk   21:59, 18 May 2010 (UTC)
thread_title:  What happens to the non-organic soluble materials 

message: Following edit has been removed; although the header "Circular sedimentation tanks" is best swapped for "Settling basin", I think it's accurate to place it at a seperate section. If you look at the schematic on the article, circular sedimentation tanks also come behind the rectangular, aerated/vortex basins. Hence, perhaps reinstate the infor by reverting to http://en.wikipedia.org/w/index.php?title=Sewage_treatment&oldid=472802720
91.182.211.156 (talk) 11:50, 26 January 2012 (UTC)
replies: text: Circular sedimentation tanks, clarifiers, primary settlement tanks, secondary settlement tanks, sludge consolidation tanks - call them what you like, but they are probably the most common tank in the business and are mentioned throughout the article and therefore don't need a separate section as if they are something special or different.  Velella  Velella Talk   12:00, 26 January 2012 (UTC)
replies: text: The choice between circular or rectangular tanks is largely a function of available space and volume of wastewater to be treated.  Rectangular clarifiers are used where space restrictions or very large flows encourage common wall construction of multiple basins within a small land footprint.  Circular clarifiers may provide more efficient volume and flow characteristics where space is available.Thewellman (talk) 19:31, 26 January 2012 (UTC)
thread_title: Settling chamber

message: In the Process overview section, MBBR (Moving Bed Biofilm Reactor) is discussed in the Secondary treatment sub-section with a direct link to World Water Works’ website, a business that provides wastewater treatment solutions. With multiple businesses providing MBBR solutions such as Headworks Bio Inc, Veolia/ AnoxKaldnes and Siemens, is the direct linking of World Water Works’ website a Conflict of Interest?  Specifically, a self-promotion?  Perhaps linking to an industry trade group for an explanation of MBBR would be the better course of action?  Water World, a nationally recognized industry trade group for wastewater treatment, provides a webcast on the topic of Evaluation, Application and Operation of IFAS and MBBR Technologies.
:Almost certainly so. Please feel free to make an appropriate change.  Velella  Velella Talk   15:20, 27 April 2011 (UTC)
replies: text: Done.  Thank you for the confirmation.  I like to verify these types of issues via the talk page to ensure I am editing pages correctly.  EERichards  EERichards Talk   17:26, 27 April 2011 (UTC)
thread_title:  Process overview section 

message: The attention of those knowledgeable about water treatment would be welcomed at :commons:Commons:Deletion_requests/File:Simple_water_treatment_plant.png
Thanks  Andy Dingley (talk) 17:21, 31 January 2012 (UTC)
thread_title:  KVDP images - your knowledge would be welcomed. 

message: Wastewater treatment currently consumes about 15 GW or about 3% of the electrical power produced in the United States. Domestic, industrial and animal wastewater together however contains about 17 GW of potential energy. At present, this energy is still untapped, yet could be extracted using a microbial electrolysis cells (MEC).Conversion of Wastes into Bioelectricity and Chemical by Using Microbial Electrochemical Technologies by Bruce E.Logan, Korneel Rabaey
mention in article
109.130.149.22 (talk) 10:47, 5 January 2013 (UTC)
replies: text: There's many, many possible ways to extract energy from organic waste.2601:1:9280:155:E1CA:5ABE:F2A2:BCEA (talk) 06:55, 15 April 2014 (UTC)
thread_title: Energy use

message: Where is the reference on Nitrospira being more active than Nitrobacter in the environment? I have read that this is true only for marine environments.
122.3.43.60 (talk) 11:07, 19 March 2013 (UTC)
thread_title: Nitrospira

message: "Communities that have urbanized in the mid-20th century or later generally have built separate systems for sewage (sanitary sewers) and stormwater, because precipitation causes widely varying flows, reducing sewage treatment plant efficiency.Burrian, Steven J., et al. (1999)."The Historical Development of Wet-Weather Flow Management." US Environmental Protection Agency (EPA). National Risk Management Research Laboratory, Cincinnati, OH. Document No. EPA/600/JA-99/275."
This is one heck of an understatement.  It does more than just reduce efficiency.  It can totally disrupt a plant for a long period of time.  It essentially shuts down many plant designs for various reasons, including the ecosystems in each tank.  Maybe someone with more experience with this phenomenon could State it in more detail.  It's not like it's even 'original research' since there's plenty of books to reference in the treatment industry on possible plant failures.  For example, the books used to study for exams. 2601:1:9280:155:E1CA:5ABE:F2A2:BCEA (talk) 07:04, 15 April 2014 (UTC)
thread_title:  Origins of Sewage - more details needed? 

message: This sections seems like an indiscriminate collection of information. The thing that seemed wrong to me initially was the inclusion of Israel, which is a developed country, but actually the section is problematic overall. It mostly provides random information from three countries: Venezuela, Iran and Israel. There is one general and unsourced line about sub-Saharan Africa without any useful information. There is no information about Asia or the Americas beyond the above countries.
I see two possible solutions: either removing the section entirely, or having a by-country section which will list information on sewage treatment in as many countries as possible.
—Ynhockey (Talk) 15:19, 9 December 2014 (UTC)
replies: text:  I agree that this section needed more work. I have done a bit but it needs more. I have moved the part about Israel to a new section on reuse, as it's more about reuse. I don't think it would be very interesting to have a by-country section as the situation in almost all developing countries is quite similar: pretty much no sewage treament; sewage collection only in the CBDs of major cities. EvM-Susana (talk) 22:26, 26 December 2014 (UTC)
thread_title:  "Sewage treatment in developing countries" section 

message: I think we should trim down the information on sludge treatment on this page and rather move it to the existing page on sewage sludge treatment. For example, the recent addition about the Omni processor should in my opinion rather be on the sewage sludge treatment page as it is clearly a process for sewage sludge only, not for sewage treatment:
New research developments[edit source | editbeta]
A new sewage sludge treatment process aimed at developing countries is currently under development. It is called the Omni Processor and is a self sustaining process which uses the solids of the sewage sludge as fuel to convert the waste water into drinking water and surplus electrical energy.[27] EvM-Susana (talk) 11:43, 13 January 2015 (UTC)
replies: text: Yes, let's do it. This will also help to improve the article on sewage sludge treatment which so far has almost no references. I would say ALL information about sewage sludge treatment should be moved to the existing sewage sludge treatment page (i.e. not just the information on alternative sludge treatment), except for a short summary that can remain on the page of sewage treatment. EvM-Susana (talk) 19:41, 13 January 2015 (UTC)
replies: text:  Done thanks to Thewellman. EvM-Susana (talk) 10:39, 14 January 2015 (UTC)
thread_title:  Less information on sludge treatment on this page? 

message: Perhaps imbibing Goldschläger has something to do with this.   7&6=thirteen (☎) 15:23, 4 May 2015 (UTC)
thread_title: Gold in poo

message: Hello fellow Wikipedians,
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*Added archive https://web.archive.org/web/20060904172532/http://ironwood.cpe.uchicago.edu/CPE_Workshop/paper/Cain-Rotella-Sept2005.pdf to http://ironwood.cpe.uchicago.edu/CPE_Workshop/paper/Cain-Rotella-Sept2005.pdf
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thread_title:  External links modified 

message: I propose that wastewater treatment be merged into sewage treatment. The subject is exactly the same in common usage of the terms, and the information is mostly duplicates that could be consolidated better on this page
: Please see the above discussion: Proposed name change to "wastewater treatment"  Although other wastewaters are commonly treated with sewage for reasons including dilution and economy of scale, merger would obscure both the significantly different treatment requirements for differing wastewaters and the reduced fraction of pollutants removed from combined wastewaters. Thewellman (talk) 00:57, 2 January 2018 (UTC)
replies: text: Oppose merger as per Thewellman . Please also see a variety or articles on waste water treatment including :Industrial wastewater treatment, :Agricultural wastewater treatment etc. all of which would somehow have to be shoe-horned into one article. There is some significant overlap but that would be best dealt with by pruning :Wastewater treatment. There seems to be no benefit to this proposal. (apologies, I now realise that I said the almost identical thing in 2014)   Velella  Velella Talk   07:01, 2 January 2018 (UTC)

text: Also Oppose from me but we need to take another look at how we can make it clearer that it's not the same. I think the two articles for treatment are fairly OK, but last time I checked I found quite a bit of overlap between wastewater and sewage, e.g. in the lead. This needs to be worked on.EMsmile (talk) 00:55, 18 January 2018 (UTC)
replies: text:  This issue still requires looking at. I just realised that when it comes to the global situation, the term used in most publications by the UN is "wastewater treatment" but we would call it "sewage treatment" within the Wikipedia context. As a result, there is now a bit of new content on the wastewater treatment article about the global situation which should probably be moved to "sewage treatment". But other editors will probably continue to add content to "wastewater treatment" in future because colloquially it is used perhaps even more than "sewage treatment" nowadays. I also have the feeling that the term "wastewater treatment plant" (WWTP) is replacing "sewage treatment plant" (STP) in many cases. So we have a problem here that is not going away... EMsmile (talk) 02:39, 29 March 2021 (UTC)
replies: text:  I have made some modifications to both articles in the meantime and hope that the borders between the two articles are now clearer. We just have to make sure that in future, new editors don't add content to wastewater treatment that already exists at sewage treatment. Hopefully, the wastewater treatment article will remain as a more high-level overview article that does not go in depth in anything. EMsmile (talk) 04:44, 25 August 2021 (UTC)
thread_title:  Propose Merging with Wastewater Treatment 

message: Some of the article seems to have been written as if it's only about the U.S. — e.g., "Sewage collection and treatment is typically subject to local, state and federal regulations and standards." --84.93.89.54 (talk) 12:23, 30 January 2019 (UTC)
replies: text: I agree this is a broader issue for many Wikipedia articles. If you see anything that requires changing, please do point it out or make the change directly if you can. EMsmile (talk) 02:41, 29 March 2021 (UTC)
thread_title:  Parochial? 

message: There is a discussion here proposing that it might be appropriate to promote this article to GA status. Because this may impact other articles , the discussion is currently at the Sanitation Project talk page where comments and suggestions are welcome.  Velella  Velella Talk   15:05, 29 March 2021 (UTC)
thread_title:  Possible promotion of this article to GA ststus 

message: I have just made quite some changes to the article. What I tried to do is this:
# Provided a better balance between different types of sewage treatment processes. The current emphasis was too much on the activated sludge process.
# Provided information about some of the low cost treatment methods.
# Provided information about how to select the right treatment process for a given case.
# Reduced some content that was repetitive or too detailed if sub-articles existed.
# Moved the history content to history of water supply and sanitation and replaced it with an excerpt. This is to keep all the history stuff in one place rather than having overlapping content in several places. Hopefully like this it will be enough to give people an idea and to show them where they have to look for more information.
# Tried to reduce some of the focus on the US by providing more information about developing countries, using the book by Marcos Von Sperling which is available for free as a pdf file which makes it very handy. EMsmile (talk) 04:48, 25 August 2021 (UTC)
thread_title:  Restructuring work (Aug 2021) 

message: A discussion is taking place to address the redirect :Crap plant. The discussion will occur at Wikipedia:Redirects for discussion/Log/2021 August 25#Crap plant until a consensus is reached, and readers of this page are welcome to contribute to the discussion.  firefly ( t · c ) 08:13, 25 August 2021 (UTC)
thread_title:  "Crap plant" listed at [[Wikipedia:Redirects for discussion|Redirects for discussion]] 

message: I am working with an external content expert (Marcos Von Sperling) to review this article. This is part of this project. I will save after each small change and explain in the edit summary what was done. Happy to engage in further discussions on those changes. He has also sent me some images, some of which I will also include. EMsmile (talk) 06:20, 6 October 2021 (UTC)
replies: text: I have now added all the reviewers comments to the article. EMsmile (talk) 03:35, 14 October 2021 (UTC)
thread_title: Reviewer's comments

message: I have just added more images that were supplied to Wikimedia Commons by Marcos Von Sperling. The aim here is to show the variety of sewage treatment process and sizes that exist around the world, i.e. not to just focus on the activated sludge process. For the same reason, I have also created an image collage for the lead now. We can discuss further if I found a good balance or if we need different photos that are more suitable/appealing. EMsmile (talk) 03:35, 14 October 2021 (UTC)
thread_title: Use of images in the article and in the lead