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Transcript of The Sewage
Table of contents: I. Introduction
A. Sewage treatment
B. what is sewage treatment
C. Where it comes from
1. Preliminary treatment
2. Primary treatment
3. Secondary treatment
4. Tertiary treatment
II. Preliminary Treatment
1. removal of the solids
III. Primary treatment
A. Separate sludge from water
IV. Secondary treatment
A. Biological treatment
1. micro-organisms clean h2o
2. removal of nitrogen and phosphate
IV. Tertiary treatment
A. Removal of organic matter
1. this requires the use:
a. Sand filter
b. machanical filtration
Mysteries of Life with: So what is sewage treatment? Sewage treatment is the process of removing contaminants from waste water. There are two main types of sewage treatment. Domestic sewage treatment - this is household wastes for example. Industrial sewage treatment - this is used water from manufacturing or chemical process. There are three main steps in treating sewage: 1. Primary treatment
2. Secondary treatment
3. Tertiary treatment These steps are cautiously supervised in order for the water to be properly cleaned and then irrigated into the sea. Preliminary Treatment After the water is used it ends up in a sewage treament plant. This is where the preliminary treatment takes place.
In this process, large solids are removed with screening. The by product of the screening process are large solids, rags, and plastic. After screening the next process in this category would be grit removal.
This allows sand, grit, and rocks to settle. Primary Treatment The sewage passes through large sedimentation tanks to provide the
sludge with a settlement of about 8 hours. Most of the solids settle
to the bottom of the tank, and form a watery sludge, this is know as
primary sludge. The remaining sewage is taken to the oxidation tanks. Sludge is undisolved solids in raw sewage. vocab corner: BOD - Biochemical Oxygen Demand. It is an important measure of water quality. It's the amount of oxygen needed by bacteria and microorganisms. Only one third of BOD is removed in the primary process Secondary Treatment This process takes place in the oxidation tanks beds. This is where the effluent comes into contact with oxygen and aerobic microorganisms.
Those microorganisms break down oranic matter. Primary treatment removes about 90% of BOD. After oxidation comes chlorination, which is basically adding chlorine (Cl2) to remove bacteria just in pools. Nitrogen and phosphorus (P) are removed from the sewage water, thus reducing the nutrient load on the recieving waters. Tertiary Treatment The tertiary treatment is used to get the highest quality of water is possible by the used sand filters, mechanical filtration, or the use of a wet land Solids are removed by physical filtrations, organic matter may be removed by physical process. Biodegradation ultimately removes most organic matters. This is why the wetland is where the culminating process takes place. How do wetlands work? Simple Wetlands are like filters. When waste substances enter the wetlands before reaching the body of water, wetlands plants will take in the harmful substances. As you can see in this diagram the farm without a wetland pollutes the sea more, rather than the farm that has a wetland. less pollution more pollution no wetland wetland After the water is filtered, the by-product still has to be treated. Sludges have high content of water and they are eventually turned into fertilizer. So in the end the sewage water is recycled using the three steps in sewage treatment. Finally it ends up being discharged into the seas or a body of water. Why is this important?
If the sewage is not taken care of it can harm people in many different ways. If the sewages aren't controlled large cities would be in chaos. Even though the whole idea of sewage sounds disgusting it's very important. It also helps the envionment by recycling water. If it weren't for sewage treatment the beaches would be infested with waste. ONE MORE THING figure 4.1 see figure 4.2 figure 4.2 Luis L. and Jose .V 1 It is also called sanitary sewage info. THE CHEMISTRY STUFF.
solutions: sources: Eventhough sewge treatment is mostly biology. There is a bit of chemistry to it. Chemicals like nitrogen and phosphate have to be removed
There is also an aerobic process, which depends on oxygen.
sewage treatment After sewage treatment Almost forgotten foundation for water research, Peview of current knowladge; Sewage sludge. Foundation for water REsearch, arlow SL7 1fd 2002.
FWR; (2010 jun 3). Sewafe treatment. Retrieved form http:// www. wufd. com/gtml/sewage treatment. html.
KImball, John. " Kimballs Biology Pages." Sewage treatment, 4 August 2003, Wed 8 june 2010. <htt:// users.rcn.com/ jkimball.ma./ ultranet/ biology pages/ s/ sewage treatment/ index.html Siago, Barbara, and William Cunningham, Enviormental science . 5. Boston: McGrantlill 1999 Print.