The solution to Problem is a flow diagram for a treatment plant with primary sedimentation and secondary step aeration. Expand this diagram to include direct tertiary granular-media filtration and effluent chlorination. Show the arrangement of filters and backwash system. Recommend the kind of filter media, underdrain system, method of backwashing, and flow control. (Refer to Sections 14.4 and 10.16-10.18.) List numerical design guidelines for sizing the processing units.
Problem:
The high-purity-oxygen process illustrated in Figure 12.39 is being considered for treatment of an unsettled domestic wastewater flow of 1.40 mgd with an average BOD of 200 mg/l. Compute the aeration volume required based on a maximum allowable BOD loading of 130 lb/1000 ft3/day and minimum aeration period of 1.8 hr. For this system, what is the F/M ratio in terms of lb of BOD/day/lb of MLVSS, assuming an MESS of 5500 mg/l, that is 75% volatile?
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