The secondary stage of a wastewater treatment plant using the activated sludge process in a continuous flow tank reactor 1. Achieves removal of soluble and colloidal biodegradable organic matter by biological means 2. Requires air for only mixing the organic matter 3. Must include a secondary clarifier 4. Consists only of volatile solids

The secondary stage of a wastewater treatment plant using the activated sludge process in a continuous flow tank reactor 1. Achieves removal of soluble and colloidal biodegradable organic matter by biological means 2. Requires air for only mixing the organic matter 3. Must include a secondary clarifier 4. Consists only of volatile solids

Solid Waste Engineering

3rd Edition

ISBN:9781305635203

Author:Worrell, William A.

Publisher:Worrell, William A.

Chapter4: Mechanical Processes

Section: Chapter Questions

Problem 4.2P

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a) A wastewater treatment plant consists of primary treatment followed by an activated-sludge secondary system. The plant processes 7000 m3/d of wastewater with 180 mg/L of BOD5 and 150 mg/L of suspended solids. The primary sludge contains 500 kg of dry solids per day with 4.5% solids content. The plant produces 760 kg of total sludge (primary and secondary) per day. Assume 30% removal efficiency of the primary clarifier and F/M ratio of 0.2 for the aeration tank. b) The thickened sludge from problem a) is to be digested in a standard-rate mesophilic anaerobic digester (MAD). The sludge has 68% organic content, and approximately 60% of the organic fraction is digested after a 30-d period. The digested sludge has a solids content of 6% and is stored for a period of 90 d. Calculate the volume of the standard-rate digester
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