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Activated sludge is best fit to the removal of soluble raw material due to the fact that insoluble raw material could generally be eliminated more economically by physico-chemical means. Frequently, nevertheless, wastewaters will consist of both soluble as well as insoluble organic matter. AS leaves the reactor with the treated effluent yet is settled out in a clarifier and also went back to the oygenation device to recycle the bacteria. The quantity of AS needed for efficient operation varies according to the design of the ASP and the concentration and also nature of the effluent being dealt with. Distributors of ASPs must be able to encourage on the optimal quantity of AS in the system. The proportion of the amount of effluent in regards to BOD as well as the quantity of AS (called the f/m proportion) is a vital layout and also running criterion and also occasionally ASPs are operating so regarding keep a set f/m proportion.