A wastewater flow with the following characteristics is to be treated in a completely mixed activated-sludge system. This system is operated at the sludge age of 10d and treats wastewater flowing at 18,000 m³/d. Average influent BOD is 200 mg/L and 92% BOD removal has been achieved. Yield is 0.4 kg biomass/kg BOD and decay coefficient is kd = 0.06 d-1. The reactor is designed to operate at a biomass concentration of 2,500 mg/L and the biomass concentration in return sludge is 15,000 mg/L. The mass of solids wasted each day? () tonne/d (*No unit)

A wastewater flow with the following characteristics is to be treated in a completely mixed activated-sludge system. This system is operated at the sludge age of 10d and treats wastewater flowing at 18,000 m³/d. Average influent BOD is 200 mg/L and 92% BOD removal has been achieved. Yield is 0.4 kg biomass/kg BOD and decay coefficient is kd = 0.06 d-1. The reactor is designed to operate at a biomass concentration of 2,500 mg/L and the biomass concentration in return sludge is 15,000 mg/L. The mass of solids wasted each day? () tonne/d (*No unit)

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Biological Processes

Biological solid waste includes bacterial and contaminated waste produced by living individuals. Its treatment is essential to prevent the spread of any air-borne or water-borne diseases or diseases transmitted from one organism to another in a food chain. There are many benefits of the biological solid waste treatment and some of them are: the minimized quantity of waste substance, waste control, eradicating any disease-causing pathogens, generation of biogas, composting, anaerobic digestion, bio drying, mechanical biological treatment, microbial fuel cell, phytoremediation, and biofiltration. The final products of the biological solid waste treatment may be recycled to obtain organic fertilizers or disposed of in SWDS (Solid Waste Disposal Site) after proper treatment.

Question

A wastewater flow with the following characteristics is to be treated in a completely mixed activated-sludge system. This system is operated at the sludge age of 10d and treats wastewater
flowing at 18,000 m3/d. Average influent BOD is 200 mg/L and 92% BOD removal has been achieved. Yield is 0.4 kg biomass/kg BOD and decay coefficient is kd = 0.06 d1. The reactor is
designed to operate at a biomass concentration of 2,500 mg/L and the biomass concentration in return sludge is 15,000 mg/L.
The mass of solids wasted each day? () tonne/d (*No unit)

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