What is the volume of a CSTR with no recycling of settled solids and treating 80 m3/day of wastewater with a θx of 2 days? What would the volume of the CSTR with recycling of settled solids treating the same amount of wastewater be if the ratio θx/θ for this reactor was 20?

Q: Waste, measured as BOD, is removed according to first order kinetics at a rate constant of 0.4…

A: We knowBODt=BODY1-e-ktso for ·%BODtBODy=100-80=20%so,0.2=1-e-0.4tt=1.9348min

Q: 2) A wastewater is to be treated in a CSTR. Assume a first-order reaction where k = 0.15 per day.…

A:

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.