Sewage Treatment
The process of sewage treatment from start to finish.
The first step to sewage treatment is the pretreatment. This is where the raw wastewater is collected and disposed off. Easily removed products such as rocks, oils, fats are also removed during this process. The next step is to remove the rest of the big particles in order to stop big lumpy objects clogging the system up. This is called screening.
The next process is the sedimentation process in which all of the large objects and oils and fat are skimmed off as sludge and are pumped into further sludge treatment areas. Meanwhile that, the wastewater is filtered and cleaned in order to remove harmful bacteria, chemicals or organic growths such as mould. Aeration and heating of the water also removes a lot of bacteria.
Then extremely fine filtration is needed to remove the last of the sludge. Then the wastewater is left so more wastes sink to the bottom. After that the wastewater is disinfected.
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One Response to “Sewage Treatment”
On June 12, 2009 at 8:49 am
What you are actually reviewing here is ONE option for sewage treatment, one that is inherently unstable and so problematic. Activated sludge depends for its treatment effect on very few trophic levels of organisms living in concentrations far higher than found in nature, so it depends for its treatment effect on large inputs of energy and careful attention to maintaining proper conditions, which among other things requires that sludge be handled on time scales measured in hours or the process will degrade. For a number of reasons, the process is prone to upset on a routine basis. There is not even an operating theory for activated sludge that does not presume steady state flow. Therefore, this is a technology that should not be highly considered for anything but large base-loaded treatment units. For other situations, there are other technologies that would be much better choices, such as recirculating biofilters and constructed wetland concepts. But from this piece, you wouldn’t know that sewage treatment was not, solely and exclusively, done by the activated sludge process. This is a disservice. Please consider correcting this misimpression. Thank you.
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