Sewage treatment | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-05-05

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Sewage_treatment


00:01:31 1 Terminology
00:02:27 2 Origins of sewage
00:03:12 2.1 Sewage mixing with rainwater
00:05:01 2.2 Industrial effluent
00:06:01 3 Process steps
00:06:11 3.1 Overview
00:08:35 3.2 Pretreatment
00:10:00 3.2.1 Grit removal
00:11:59 3.2.2 Flow equalization
00:12:58 3.2.3 Fat and grease removal
00:13:31 3.3 Primary treatment
00:14:22 3.4 Secondary treatment
00:16:27 3.5 Tertiary treatment
00:17:04 3.5.1 Filtration
00:17:25 3.5.2 Lagoons or ponds
00:18:01 3.5.3 Biological nutrient removal
00:19:17 3.5.3.1 Nitrogen removal
00:25:15 3.5.3.2 Phosphorus removal
00:28:24 3.5.4 Disinfection
00:32:29 3.6 Fourth treatment stage
00:34:57 4 Odor control
00:35:58 5 Energy requirements
00:37:06 6 Sludge treatment and disposal
00:38:27 7 Environment aspects
00:40:16 7.1 Effects on biology
00:43:26 8 Reuse
00:44:39 9 Developing countries
00:46:36 10 History
00:48:19 10.1 Early attempts
00:50:29 10.2 Biological treatment
00:54:00 11 See also



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SUMMARY
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Sewage treatment is the process of removing contaminants from municipal wastewater, containing mainly household sewage plus some industrial wastewater. Physical, chemical, and biological processes are used to remove contaminants and produce treated wastewater (or treated effluent) that is safe enough for release into the environment. A by-product of sewage treatment is a semi-solid waste or slurry, called sewage sludge. The sludge has to undergo further treatment before being suitable for disposal or application to land.
Sewage treatment may also be referred to as wastewater treatment. However, the latter is a broader term which can also refer to industrial wastewater. For most cities, the sewer system will also carry a proportion of industrial effluent to the sewage treatment plant which has usually received pre-treatment at the factories themselves to reduce the pollutant load. If the sewer system is a combined sewer then it will also carry urban runoff (stormwater) to the sewage treatment plant. Sewage water can travel towards treatment plants via piping and in a flow aided by gravity and pumps. The first part of filtration of sewage typically includes a bar screen to filter solids and large objects which are then collected in dumpsters and disposed of in landfills. Fat and grease is also removed before the primary treatment of sewage.