Water recycling with solids and foam removal

A water economizing system for new or existing buildings where the waste lines of lavatory sinks, showers and clothes washing machines are connected to a storage reservoir for accumulation of water therein. This accumulated water is filtered and treated and thereafter used for the operation of water closets of toilets, the storage reservoir providing for the removal of solids and foam by flushing action at the top and subsequently by the gravitational separation of solids which are periodically flushed from the bottom of the reservoir into the sewer. The pumping action which delivers the accumulated water to the water closets of toilets may optionally be hydraulically operated by a portion of the water drained to the storage reservoir.

BACKGROUND OF THE INVENTION 
One of the most essential ingredients for life is wholesome, palatable 
drinking water. Throughout the history of mankind, wars have been fought 
over the possession and ownership of bodies of potable water. Man may 
exist for weeks upon nothing but water and its essential value has always 
been recognized. 
In modern times, through industrialization, urbanization and population 
growth, vast sources of clean water have been eliminated or so 
contaminated as to be rendered unfit for human consumption. The invention 
involves a system whereby available water supplies are more judiciously 
utilized by improved and more effective distribution, thus saving an 
additional twenty-five percent, or more, without harmful effect to the 
consumer or the community. 
In household sinks and showers of conventional systems currently in use, 
the water is soiled by soap and material washed from a person's body, and 
discharged to a sewer drain. With laundry washing machines the sewer 
discharged water is soiled by the detergent and the dirt from the laundry. 
With rain water the detritus is largely leaves, twigs and air borne matter 
such as soot and dust. Such water is commonly referred to as "gray water." 
In water closets of toilets, where proper functioning is predicated upon 
the provision of a proper liquid volumetric vehicle, usually several 
gallons of water are required to carry off the waste contained therein. 
Although it is not essential that the water used in these devices be 
potable in the strict sense it should not be so contaminated as to pose a 
danger to children and animals. The waste entailed in conventional systems 
is not only of natural resources but also is an unnecessary drain on the 
user. 
The invention provides a system where the liquid discharge from the sinks, 
showers and washing machines of a household is stored in a suitable 
reservoir, supplied to the water closets when needed and then ultimately 
discharged to the sewer. However, for such a system to be acceptable, it 
is necessary that it is able to operate continuously in an adequately 
sanitary manner with minimum maintenance. With pilot and experimental 
installations, it has been learned that after about six months a faint but 
discernible odor begine to emanate from the reservoir. Thus, an important 
aspect of the invention relates to the reservoir and associated equipment 
whereby the gray water therein is adequately flushed and maintained 
sufficiently clean to preclude the emission of undesirable odors even 
after a relatively long period os use. 
DESCRIPTION OF THE PRIOR ART 
A patent to Call, U.S. Pat. No. 3,112,497, issued Dec. 3, 1963, discloses a 
water conservation system where the same water is used for two purposes 
before being discharged. An O'Brien et al, U.S. Pat. No. 3,183,525, issued 
May 18, 1965 relates to a water conservation device for use in a fallout 
shelter. A patent issued Mar. 2, 1971, to Kemperer, U.S. Pat. No. 
3,567,032, discloses a diaphragm type pump used in a recirculating 
samitary system. A patent to Reid, U.S. Pat. No. 3,594,825, issued July 
27, 1971, is directed to a system for storing water that has been used in 
a shower or basin and reusing it in a flush toilet. Of particular interest 
is a pamphlet entitled "Demonstration of Waste Flow Reduction from 
Households" EPA-670/2-74-071, September 1974, distributed by U.S. National 
Environmental Research Center, Office of Research and Development, U.S. 
Environmental Protection Agency, Cincinnati, Ohio 45268. This pamphlet 
discusses various means for the conservation of water and including 
consideration of systems for recycling water that has been used for 
washing and showering, so that it may be used for flush toilets or the 
like. 
A patent to Lankton, U.S. Pat. No. 2,419,319, issued Apr. 22, 1947 relates 
to a portable housing unit adapted to be prefabricated as a factory item 
and mounted as a unit in a building. Other patents of interest are U.S. 
Pat. Nos. 1,200,126 to Mitchell, 1,946,163 to Hiett, 2,190,812 to 
Wahlmark, 2,974,800 to Fleischmann, 3,815,159 to Delaney et al, and 
3,849,305 to Majikian. 
BRIEF SUMMARY OF THE INVENTION 
An object of this invention is, broadly, a practical household system 
wherein all or a portion of the water that is usually discharged to the 
sewer is satisfactoruly treated and preserved for use in another facility 
before its ultimate disposal. 
A further object of this invention is a waste water conservation system 
comprising a practicable process and apparatus for sanitizing, maintaining 
free from undesirable emissions for a relatively long period, and reusing 
the waste water from sinks, showers and washing machines for water closets 
of toilets. 
Another object of this invention is a process and apparatus for the 
conservation of water, comprising the accumulation and storage or rain 
water from roof gutters, to be admixed with water from household sinks, 
showers or washing machines and ultimately used for water closets of 
toilets or garbage disposals. 
A yet further object of this invention is a process and apparatus as 
above-mentioned, wherein a disinfectant material is added to the stored 
liquid prior to use in the water closet. 
Alternatively, the salvaged water may be caused to flow through, or 
otherwise be exposed to, a supply of iodine crystals which cleanse the 
water. 
Other objects, adaptabilities and capabilities of the invention will appear 
as the description progresses, reference being had to the accompanying 
drawings, which:

DESCRIPTION OF THE PREFERRED EMBODIMENTS 
In FIG. 1, a building comprising a house 10 is provided with conventional 
float tank water closet 11, lavatory 12, tub 14 and washer 15. The 
lavatory, tub and washer are connected to a source of suitable clean 
uncontaminated water through a conventional piping system which forms no 
part of the invention, as such, and is therefore not illustrated in the 
interests of clarity. The waste lines from these facilities are not, 
however, connected directly to the sewer line as in a conventional system. 
Instead, inasmuch as this water, known as "gray water," after having been 
used, remains relatively clean, it can again be used for flushing toilets. 
Therefore waste lines 18 are connected to a storage tank 19 for settling 
and solids removal. Washer 15 is provided with a discharge line 18a which 
discharges into an open-sight drain 18b. 
Storage tank 19 is provided with a conical bottom having an included 
conical angle of not more than 120.degree. and a valved drain system 21. 
The drain system is provided for the periodic removal of sediment, dirt 
and grit, and the like, which settles to bottom 20. It will be noted that 
tank 19 is disposed at a level below the main or first household floor 22 
and therefore conventional gravity flow to the tank sufficies for the 
purpose of collecting the gray water. The tank and its essential 
components are preferably enclosed in a separate compartment or box-like 
holder as described hereafter with reference to FIG. 9. Deodorant pellets 
may be added to the contents of the tank to remove odors, impart an 
unpleasant taste to the water, or color same or any combination thereof. 
An important feature of the system is in the provision of a filtering, 
chlorinating and bluing system for this reused gray water. A deodorizing 
canister designated generally by reference numeral 23, may be provided on 
an upper portion of the tank 19 which may contain a supply of liquid 
sanitizer, deodorizer and soft blue coloring agent which is gravity fed 
into the gray water in tank 19 in controlled amounts. Alternately, or in 
combination, canister 23 may also function as a vent to tank 19 and serve 
to deodorize material emitted therefrom. FIG. 6 shows further optional 
embodiment wherein a canister 27 is supported in a container 23a which is 
mounted by a bracket 18c affixed to line 18 and is provided with a conduit 
24 having a tip 25 disposed in the flow path of the gray water flowing 
through the waste lines 18, immediately prior to discharge into the 
settling storage tank. Tip 25 is split as at 26, the bisection being of a 
character and sufficiently thin that it normally prevents the flow of the 
liquid 27 from its interior, except that upon being wetted on its exterior 
by the water flowing in the waste lines 18 it permits the flow of the 
liquid 27 to intermix in selected amounts in the flowing water. Thus it 
will be seen that this chlorinating means functions only while the gray 
water is being added to tank 19 and the tip 25 is wetted. 
A flow reversible pump designated generally by reference numeral 28 
automatically functions to displace water from tank 19 into the gray water 
feed pipe line 29 and to maintain the desired pressure therein. Water in 
this pipe is pumped to an upper portion of the household into an upper 
storage tank 30 which may be of diaphragm type to maintain pressure 
through the gray water feed system. The tank may be hidden in a closet or 
be in an attic or at any appropriate location where danger of the water 
therein freezing does not exist. A line pressure switch 53 is interposed 
between pump 28 and tank 30. Upon flushing water closet 11, gray water 
from the upper storage tank 30 flows through the conduit 29 thereto to 
replace water flushed from the tank of water closet 11. This flushed water 
and wastes therein are discharged to the sewer line 32. The drain system 
21 of tank 19 also discharges to a sewer line 32. If desired, the upper 
storage tank 30 may be disposed in the general region of the main storage 
tank 19, such as at the location of tank 30a, for example. The function is 
essentially the same inasmuch as the entire system is maintained under 
pressure by pump 28 and by the head of pressure above the diaphragm 
whether in tank 30 or 30a. Tanks 30 or 30a also function as a reservoir 
for the several water closets. When the water closets are flushed, the 
fall in water level in the tank results in a lower pressure upon the line 
pressure switch 53 which, in turn actuates pump 28 to refill tank 30 or 
30a and repeat the cycle. Pump 28, as previously indicated, is preferably 
reversible to back-flush periodically, for example, every twenty-four 
hours. Piping arrangements, per se, for reversing pump 28 are well-known 
and therefore are not shown. 
A tank pressure switch 54 acts as a safety cutoff for pump 28. If the water 
level in tank 19 drops too low, switch 54 breaks the circuit to the 
electric motor 55 of pump 28 which will not then operate. Further, tank 
pressure switch 54, with a reduction in pressure in tank 19, causes a fill 
solenoid 34 in conduit 37 to open. As shown in detail in FIGS. 1 and 7, 
this causes fresh water from the building's fresh water system via a fresh 
water inlet to fill tank 19. Conduit 37 also has a manually operated gate 
valve 36. A manual fill 35 which by-passes the automatic fill may be used 
if necessary. This manual fill comprises a gate valve 35b in a conduit 
35a. Both conduits 35a and 37 carry fresh water to a tank fill funnel 38 
and a further conduit 39 which leads into tank 19. It should be noted that 
there is an air break between the conduit 37 and the funnel 38 to prevent 
the least possibility of contamination of the fresh water system. Valve 36 
in conduit 37 is preferably adjusted to ensure that the flow of fresh 
water provided therein is not at a rate to exceed the cap capacity of 
funnel 38 for drainage into tank 19. 
The valved drain system 21 is opened for a few moments periodically to 
drain off any sediment from tank 19. Also inasmuch as the quantity of 
water flowing into tank 19 from the washers, showers, etc., is normally 
greater than the quantity pumped out for water closet use, the water level 
in tank 19 rises and the gray water passes through an overflow 39a and is 
discharged to sewer line 32. This action is utilized to remove any surface 
film which may accumulate on the surface of the gray water. In larger 
buildings such as office buildings where this system can be incorporated, 
the reverse situation occurs and some makeup water is normally required. 
Waste lines are vented conventionally through conduits as indicated by 
reference numeral 40 and check valves 41 are appropriately disposed in the 
system to prevent back flow. A strainer 42 is positioned in the pipe line 
29 prior to pump 28 to prevent passage of solids therethrough. Reversing 
action of the pump 28 cleans the strainer. 
A disinfecting system as shown in FIG. 8 may be optionally substituted for 
the systems shown in FIGS. 1 and 6. In this modification a receptacle 43 
containing iodine crystals 44 is directly and removably interposed in the 
waste line 18 so that all gray water flowing to the settling storage tank 
must pass therethrough. The iodine crystals, like the chlorinating and 
bluing solution, function to deodorize as well as cleanse the stored 
water. For normal household use, the iodine crystals may remain effective 
for up to a year before replacement is required. The crystals may be added 
from time to time into receptacle 43 by removing a plug 43a. Line 18 which 
passes through the top of receptacle 44 almost touches the bottom of 
receptacle 43 whereby the crystals are slowly dissolved into the gray 
water passing therethrough. 
In the arrangement shown in FIG. 1, kitchen sink 16 with its garbage 
disposal unit 17 are connected to a waste line 45 and the material 
therefrom is discharged directly into sewer line 32. A vent conduit for 
the waste line 45 is designated by reference numeral 46. Lower level 
fixtures such as the lavatory 47 and a water closet 48 also discharge 
directly into sewer line 32; however, the water closet 48 receives its 
water through a pipe line 49 connected to pipe line 29. The pipe provided 
for lines 29 and 49, which carry the recycled gray water, may, if desired, 
be of distinctive color and character such as yellow plastic. This 
provides an additional safeguard against accidental use of gray water for 
an undesired purpose. 
In FIG. 7, the electrical components are shown diagrammatically. The main 
electric power supply (120 volt, sixty cycle AC current) is designated by 
reference numerals 50 and 50a; the main disconnect switch by 51; magnetic 
starter for motor 55 by 52; line pressure switch by 53; tank pressure 
switch by 54 and the pump motor by 55. 
In FIG. 7A the pump wiring diagram is indicated whereby the power supply 
comprising 120 volt, sixty cycle AC conduits 107 and 108 provide electric 
current to a timer 106 which ordinarily retains in an opened or 
inactivated condition a further conductor which is a continuation of line 
107 designated 107a. Solenoids 105 (for a valve 21a) and 105a (for valve 
42a) cause drainage from tank 19 for a predetermined period of time; say 
thirty seconds once in each twenty-four hour period, into sewer line 32 
whereby sediment and the like collected in the bottom of the tank 19 and 
in the strainer 42 are discharged. 
Line pressure switch 53 activates electric motor 55 when pressure in 
conduit 29 is sufficiently low as may be caused by the flushing of a 
toilet (FIG. 7). Tank pressure switch 54 in a like manner actuates the 
fill solenoid 34 and at the same time inactivates motor 55 when water in 
tank 19 is low. This condition continues until the tank pressure has 
increased sufficiently to open tank pressure switch 54 which closes the 
circuit to line pressure switch 54 and permits pump motor 55 to operate. 
This provides a safety measure inasmuch as if the water in tank 19 is so 
low as to actuate the tank pressure switch 54 the lack of water for 
suction may cause damage to an operating pump 28. 
In FIG. 2, a modified arrangement for water conservation is illustrated. In 
conventional arrangements, storm water is either discharged directly to 
the soil or into a sewer line. In either instance its usefulness as a 
liquid volumetric vehicle is lost. In FIG. 2, storm water accumulated from 
gutters 56 is conducted by downspouts 57 to trap 58. The gutters are 
provided with screens 59 to eliminate leaves and twigs. Trap 58 shown in 
detail in FIG. 3, comprises a further debris eliminating screen 60 of 
convex configuration and disposed atop the receptacle 61 whereby debris 
washes off to the side and water is received through screen 60 into 
receptacle 61. An upper discharge conduit 62 connects to the receptacle at 
a point below screen 60 and above the bottom of receptacle 61 which has a 
discharge conduit with valve 62a. Conduit 62 is in communication with a 
pipe line 63 which carries the water to a tank 64. A valve 65 is disposed 
in line 63 to limit the flow of water as desired in case of a heavy storm 
or of a large roof area. A check valve 66 prevents the back flow of water 
from tank 64. In this arrangement the drains from the lavatory, tub and 
washer are illustrated in FIG. 1. If however, it is desired to use only 
storm water for the water closet, drain 67 may be entirely omitted. The 
lines from the tank 64 to water closets 11 and 48 and therefrom to the 
sewer line are also the same as in FIG. 1. Further, where it is not 
desirable to discharge storm water to the sanitary sewer, or where a 
septic field is utilized, a high limit switch closes a solenoid 68 in the 
storm line. The solenoid is normally closed but opens at a predetermined 
water level in the tank 64 and remains open until tank 64 is filled. 
In FIG. 4, the system is further modified for use with an outdoor tank 69 
mounted on a concrete base 70 disposed below ground. A manhole 71 is 
provided, and a utility pipe 73 and vent 72 are utilized for evacuating, 
as necessary and venting the tank. The lavatory, tub and washer water are, 
as before, fed to tank 69 through pipes 74 similar to pipes 18. An 
overflow line 75 discharges excess water from the tank to the sewer, 
whereas pipe 76 feeds water from the tank to pump 28 for circulation to 
water closet 11 and the system otherwise as disclosed with reference to 
FIG. 1. Tank 69 is tilted at a minimum pitch of 3" per foot and preferable 
at about 30.degree. to 45+ relative to the horizontal to promote removal 
of solids and semi-solids therein. Utility pipe 73 terminates within tank 
69 a short distance above its lowest point wherein pipe 76 is connected. 
In FIG. 5 the salvaged gray water is recycled by a hydraulic ram or pumping 
device 77 which preferably comprises a water pump driven by a hydraulic 
motor of a type disclosed in U.S. Pat. No. 2,190,812, through the ram 
discharge line 78. This system is advantageous in the event of electric 
power failure or where no power is available. With the hydraulic device, 
as the water flows through the conduit 18 a portion thereof is pumped 
through line 78 to storage tank 30 for reuse. The remainder flows into 
tank 19 and otherwise the system is preferably as shown in FIG. 1 and thus 
also includes electric motor 55 which drives pump 28. However, it will be 
appreciated that device 77 may be substituted for the pump 28, including 
motor 55, in the embodiment shown in FIG. 1, providing the necessary 
energy for pumping a portion of it needed for the water closets with the 
remainder being discharged to sewer 32. 
It should be noted that in tall buildings which are provided with cooling 
tower water, such water may readily be utilized for water closet flushing. 
At present, this cooling water is usually wasted by being discharged to 
the sanitary sewer. The discharge from such a cooling tower may be 
connected to the downspout as is the gutter 56 in FIG. 2. 
Referring to FIG. 9, apparatus in accordance with the invention is 
illustrated in a self-contained transportable unit. This unit, designated 
generally be reference numeral 80, is contained in a parallelepiped 
framwork structure which has a width of approximately thirty inches, a 
length of approximately sixty inches, and an overall height of about 
sixty-four inches. The diameter of the holding tank 19 is thirty inches 
and the diameter of the pressure tank 30a is twenty inches. Although is 
FIG. 9 an overflow line 39a appears to extend beyond the length dimensions 
of the unit, in actuality this line extends in the corner space defined 
between the outer circumference of the holding tank and the box-shaped 
frame 81. It will be noted from FIG. 9 that frame 81 includes a platform 
81a which directly supports motor 55 for pump 28. Also supported on the 
frame 81 via a further platform 81b is pressure tank 30a, and on a 
backboard 85, an electric timer control box 82, and an electrical 
connection panel 84. Gray water supply line 18 (a two-inch pipe in this 
embodiment) connected in the side of tank 19 near its top is at the same 
level and 180.degree. displaced from overflow line 39a. Mounted on 
backboard 85 is fresh water inlet 37a which includes gate valve 36 
controlled by solenoid 34. The manual fill by-pass 35 includes gate valve 
35b. The inlet 37a and bypass 35 lead to conduit 37 which is spaced above 
funnel 38 which, in turn, leads into the interior of tank 19. Also mounted 
on backboard 85 is a filter 86 which has small diameter water conduit 
lines 86a and 86b leading from the upper and lower aspects thereof. Such 
lines connect to conduit 29 on either side of a gate valve 87 which is 
disposed in a conduit portion 29a that connects a pump discharge conduit 
portion 29b and the bottom of the pressure tank 30a. A further gate valve 
90 is disposed in the discharge conduit portion 29c which connects pump 
discharge conduit portion 29b with the gray water outlet 29d for 
connection to conduit 29 as shown in FIG. 1. 
In this embodiment the drain system 21 includes a gate valve 92 which is 
manually operated and a valve 21c operated by solenoid 105. The valve 21b 
is a check valve to ensure that the liquid flows in the system 21 in the 
direction of arrow 91 only. Strainer 42 is disposed between the inlet of 
pump 28 and the outlet conduit portion 29c of holding tank 19 in which a 
gate valve 92 is also disposed prior to the strainer. 
A diaphragm switch 96 is connected to the interior of tank 19. Switch 
mechanism 96 is actuated by a first predetermined low level (low pressure) 
within tank 19 to open solenoid valve 34 and admit fresh water through 
valve 34 and conduit 37 into funnel 38. Such water continues to flow until 
a second predetermined higher level (higher pressure) within tank 19 is 
attained to actuate mechanism 96 whereby the solenoid valve 34 is no 
longer energized. When such occurs, resilient means within the solenoid 
valve 34 causes it to close. 
Within tank 19, a plastic support 94 having a plurality of openings 95 is 
provided as illustrated in FIGS. 9 and 10. Support 95 is held by plurality 
of lugs 97 disposed at the same level along the interior of tank 19 near 
its top. Support 95, in turn, provides support for a one-half inch thick 
fiberglass filter 98 under a removal top 99 of tank 19. 
Unit 80 is installed usually in the basement of a dwelling in an 
appropriate location and appropriate connections are made with gray water 
supply 18, sewer line 32, the water closet gray conduit 29 and fresh water 
conduit 37a. Also electrical connections are made to the control box 82 
and connection panel 84. In operation, gray water supplied to the tank 19 
is filtered by filter 98 and foam collecting on top of filter 98 moves 
across same whereby it is discharged through overflow line 39a. In the 
event that amount of gray water supplied to the tank 19 exceeds its 
capactiy, the excess overflows through line 39a to the sewer 32. If, on 
the other hand, not enough gray water for the purposes of the apparatus is 
retained in tank 19, the diaphragm switch mechanism 96 is activated and as 
previously explained, fresh makeup water is added via the fresh water 
conduit 37. Water closets are supplied by means of the pumping action of 
the pump 28 whereby water is drawn from the holding tank outlet 29e and 
discharged through conduit portion 29d. Pressure is maintained on the 
system by the pressure tank 30a and motor 55 of pump 28 is actuated by the 
reduction of pressure in conduit 29 through a pressure responsive switch 
which connects into box 82 to activate motor 55 via electrical line 100. 
The pressure responsive switch involved is designated by reference numeral 
101 and is connected to tank 30a via a line 102 and to the control box 82 
via a further conductive line 104. 
As pressure changes within pressure tank 30a a small amount of water passes 
through liquid conduit lines 86a and 86b and filter 86 which contains 
iodine crystals. By this means, iodine in the amount needed is introduced 
into the system. In this connection, although valve 87 is normally a gate 
valve, it can be a check valve which allows a surge of water from pump 27 
to enter tank 30a via such valve but it requires that water passing in the 
opposite direction pass through filter 86. 
Box 82 contains a twenty-four hour timer and at appropriate times of the 
day, preferably after holding tank 19 has been inactive for a period, say 
at 4:00 a.m. or 5:00 a.m., the valve 21c is caused to open by means of a 
solenoid 105 which is electrically connected to the timing device in box 
82 and sediment and the like which is collected in the bottom of tank 19 
and also in the strainer 42 is caused to drain via the line 21 (gate 
valves 42b and 42c being normally in an open condition). An appropriate 
period is provided to accomplish the necessary draining, say thirty 
seconds to one or two minutes. After such appropriate period, the timer 
box 82 causes the solenoid 105 to close valve 21a whereupon the drainage 
ceases. 
When water is received by the tank 19 through conduit 18 a flow occurs from 
left to right as seen in FIG. 9 across the fiberglass filter 98. Any 
solids or foam in the water tend to lie on top of the filter 98 and are 
moved to the right wherein they are received through the overflow conduit 
39a and washed into the sewer 32. Filtered water, on the other hand, 
enters the tank. However, when the tank is partially drained by action of 
the timer as described above, any sediment or the like which may deposit 
on the walls of the conical bottom 20 is displaced and received via 
conduit 21 and valves 42c and 21c into the sewer 32. Periodically, or as 
otherwise required, the top 99 of tank 19 may be lifted whereby filter 98 
is removed and either cleaned or, preferably discarded and replaced by a 
further like filter. For this reason, the top 99 is preferably made of a 
relatively light plastic material such as fiberglass plastic and, in 
practice, the tank 19 may also be made of a similar material. Wherein the 
tank is molded, it is advantageous to incorporate in the bottom 20 
spiral-like furrows which terminate at the outlet into conduit 21 whereby 
a spiraling action of the draining gray water occurs and the scouring 
action of such drainage is enhanced. 
The primary purpose for the relatively high pitch in the bottom of the tank 
19 and also as shown for the tank 69 in FIG. 4 is to insure that sediment 
which may subsequently cause undesirable odors or otherwise contaminate 
the water does not permanently lodge in the tank 19. This result is 
enhanced by the utilization of the fiberglass filter 98 and the cleaning 
action due to the location and flow from conduit 18 across filter 98 and 
into the overflow conduit 39a. 
Although the preferred embodiments of the invention are described above, it 
is to be understood that the invention is capable of other adaptations and 
modifications within the scope of the appended claims.