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Design of the Aeration Basin Based on Solids Retention Time - sewer construction:
You are provided the following information about a municipal wastewater treatment plant. That plant will use the classically activated sludge process. Population = 150,000 people, flow rate of 33.75 × 106 l/day (equals 225 l/person/day) and influent BOD5 concentration of 444 mg/l (note this is high strength wastewater). Suppose that the regulatory agency enforces an effluent standard of BOD5 = 20 mg/l and suspended solids standard of 20 mg/l in the treated wastewater. A wastewater sample is collected from the biological reactor and is found to contain a suspended solids concentration of 4,300 mg/l. A suspended solids concentration within the secondary sludge is 15,000 mg/l and the concentration in the secondary sludge is 5,000 mg/l. The concentration of suspended solids in the plant influent is 200 mg/l and that which leaves the primary clarifier is 100 mg/l. A microorganism within the activated sludge procedure can convert 100 grams of BOD5 into 55 grams of biomass. They have a maximum growth rate of 0.1/day, a first-order death rate constant of 0.05/day, and they reach 1/2 of their maximum growth rate when the BOD5 concentration is 10 mg/l. The mean cell retention time of the solids is 4 days and sludge is processed on the belt filter press every 5 days.
Define the Categories of Scaling? Scaling is classified into following three categories: i. Light scale - loss of surface mortar up to 5 mm deep, with surface exposure of co
Blocked process list is not maintioned in priority order why
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Question While designing water storage tank , has movement joints be installed? Answer While designing water storage tanks , group joints can be set up in similar w
All semiconductors have how many electrons in their last orbit? Answer: All semiconductors have 4 electrons.
Maintenance of Terminal Building: All accessories such as lighting, water, sanitation, telephone and public address system should be maintained in a good condition. Disposal
if the slump of concrete drops how to rectify it
Light Rail Transit (LRT) Light Rail Transit is also known by the name train. LRT can be run on the surface if road space is available (as in Kolkata) or as elevated, with pil
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