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Sedimentation is likewise utilized to eliminate grit and also suspended solids, to generate clarified effluent, and to enlarge the sludge generated in biological treatment. Flocculation as well as sedimentation must get rid of a lot of the suspended solids and a part of the FIGURE. 4. Chemical Unit Processes:. Chemical device procedures are always made use of with physical operations as well as may also be used with biological treatment processes, although it is feasible to have a purely physico-chemical plant with no biological treatment. Chemical processes use the enhancement of chemicals to the wastewater to bring about modifications in its top quality. The key clarifier slows the diluted and gets rid of the solids that settle on all-time low with a rotating sludge ranking system. It also gets rid of solids that float to the surface area of the storage tank with its turning rake skimming system. Afterwards, the wastewater is slowly gotten rid of from the container and also supplied to oxidation fish ponds for the next step in the process. The smaller sized clarifiers are utilized when inbound wastewater quantity surpasses the capability of the larger clarifier or during maintenance of the larger clarifier. Clarifiers Vs Thickeners:Thickeners as well as clarifiers are both used to separate fluids and also solids by settling process with only one difference i. e.