Building A Conventional Sewage Treatment Facility

1674 Words Dec 5th, 2014 7 Pages
As in the case of rural non-point source pollution; urban areas are not likely to fix all contamination problems with one system. While it may be possible to build a conventional sewage treatment facility that can handle any storm condition it is not likely that this will ever be cost feasible to do. One type of larger combined sewage system that is being tried in several locations around the county where proper topography allows is the aquatic marsh system. In this type of system sewage still goes through the primary treatment of separation out the larger solids. Once these solids have settled out it move on to the secondary treatment where it undergoes another process to remove biochemical oxygen demand. This is done through introducing microorganism to convert organic matter into gases. The microorganism and sediments settle to the bottom the sewage moves on to the tertiary treatment phase. Here the sewage is introduced to a marsh environment. In these last steps the effluent is allowed to flow through a treatment wetland with different types of grasses that help absorb and filter the rest of the contaminations. The two major types of contamination that are being removed are phosphorus and nitrogen. Nitrogen in found in fertilizers and phosphorus is found in soaps. Once it finishes flowing through the treatment wetland it is pumped back the treatment facility to be chlorinated From there the chlorine is flushed and then it is routed back to an enhanced marsh to remove…
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