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Basic Clinical Lab Competencies for Respiratory Care: An Integrated Approach

Basic Clinical Lab Competencies for Respiratory Care: An Integrated Approach

5th Edition

ISBN:9781285244662

Author:White

Publisher:White

Chapter15: Humidity And Aerosol Therapy

Section: Chapter Questions

Problem 7SEPT

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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:
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.
•
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•
•
•
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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