Biochemistry
Biochemistry
9th Edition
ISBN: 9781319114671
Author: Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher: W. H. Freeman
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Question

what is the influent biodegradable chemical oxygen demand?

A complete-mix activated sludge system with membrane separation is proposed to treat onsite wastewater for a residential tower building in lower Manhattan. The system will use a trash basket, grinder pumps and trash tank to remove physical screenings. The characteristics of the primary effluent going to the suspended growth tank are: . . • ● • • • Flow: 23,000 gpd Chemical oxygen demand = 800 mg/L Biodegradable soluble chemical oxygen demand = 480 mg/L Readily biodegradable chemical oxygen demand = 200 mg/L 5 day biochemical oxygen demand = 350 mg/L 5 day soluble biochemical oxygen demand = 175 mg/L Total Kjeldahl Nitrogen = 70 mg/L Ammoniacal-Nitrogen = 45 mg/L Total suspended solids = 400 mg/L Volatile suspended solids = 315 mg/L Non-biodegradable volatile suspended solids = 160 mg/L Reactor temperature = 23º C • Dissolved Oxygen = 3 mg/L Assumptions The half-saturation coefficient Ks was measured to be 0.5 mg/L Assume that biodegradable chemical oxygen demand = 1.6 x 5 day biochemical oxygen demand. Assume that Biomass VSS/TSS = 0.85 The membrane vendor tells you not to exceed 10,000 mg/L MLSS The volumetric efficiency of the reactor is 85% Assume that all biodegradable particulate COD is converted to soluble COD Assume a 1.5 safety factor in SRT for complete nitrification Initially assume that 80% of TKN is nitrified to nitrate Develop a design for the aeration reactor based on achieving 1 mg/L of ammoniacal nitrogen in the membrane permeate.
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Transcribed Image Text:A complete-mix activated sludge system with membrane separation is proposed to treat onsite wastewater for a residential tower building in lower Manhattan. The system will use a trash basket, grinder pumps and trash tank to remove physical screenings. The characteristics of the primary effluent going to the suspended growth tank are: . . • ● • • • Flow: 23,000 gpd Chemical oxygen demand = 800 mg/L Biodegradable soluble chemical oxygen demand = 480 mg/L Readily biodegradable chemical oxygen demand = 200 mg/L 5 day biochemical oxygen demand = 350 mg/L 5 day soluble biochemical oxygen demand = 175 mg/L Total Kjeldahl Nitrogen = 70 mg/L Ammoniacal-Nitrogen = 45 mg/L Total suspended solids = 400 mg/L Volatile suspended solids = 315 mg/L Non-biodegradable volatile suspended solids = 160 mg/L Reactor temperature = 23º C • Dissolved Oxygen = 3 mg/L Assumptions The half-saturation coefficient Ks was measured to be 0.5 mg/L Assume that biodegradable chemical oxygen demand = 1.6 x 5 day biochemical oxygen demand. Assume that Biomass VSS/TSS = 0.85 The membrane vendor tells you not to exceed 10,000 mg/L MLSS The volumetric efficiency of the reactor is 85% Assume that all biodegradable particulate COD is converted to soluble COD Assume a 1.5 safety factor in SRT for complete nitrification Initially assume that 80% of TKN is nitrified to nitrate Develop a design for the aeration reactor based on achieving 1 mg/L of ammoniacal nitrogen in the membrane permeate.
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