You are asked to design a completely mixed activated sludge treatment plant with biomass recycle for a town with population of 85,000. The influent flow rate is 95 gallon/capita.day, influent BOD5 is 205 mg/L and the primary clarifier removes 34% of the influent BOD5. The discharge standard for BOD5 is 10 mg/L. The aeration tank MLSS is 4,000 mg/L, of which 72% is volatile (remember bugs are measured as MLVSS). The treatability study revealed the following kinetic coefficients. k= 4.6/day Ks= 65 mg BOD5/L Y= 0.62 mg VSS/mg BOD5 μmax= 2.8/day kd= 0.04 g VSS/g VSS.day Determine:
a. Required solids and hydraulic retention times.
b. Aeration basin volume.
c. Amount of excess sludge generated daily. d. Daily required amount of oxygen and air as volume and mass(BOD5/BODLis0.68)
e. Food to microorganism sratio.
f. Volumetric organic loading rate.

Question

30-11-2022
Engineering

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You are asked to design a completely mixed activated sludge treatment plant with biomass recycle for a town with population of 85,000. The influent flow rate is 95 gallon/capita.day, influent BOD5 is 205 mg/L and the primary clarifier removes 34% of the influent BOD5. The discharge standard for BOD5 is 10 mg/L. The aeration tank MLSS is 4,000 mg/L, of which 72% is volatile (remember bugs are measured as MLVSS). The treatability study revealed the following kinetic coefficients. k= 4.6/day Ks= 65 mg BOD5/L Y= 0.62 mg VSS/mg BOD5 μmax= 2.8/day kd= 0.04 g VSS/g VSS.day Determine:
a. Required solids and hydraulic retention times.
b. Aeration basin volume.
c. Amount of excess sludge generated daily. d. Daily required amount of oxygen and air as volume and mass(BOD5/BODLis0.68)
e. Food to microorganism sratio.
f. Volumetric organic loading rate.

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charithran8975 charithran8975 · Answer 1 · 2022-12-03T05:49:55+01:00

It has been investigated to remove the organic debris that naturally exists in coffee manufacturing wastewater using chemical coagulation-flocculation and advanced oxidation procedures (AOP).

It has been investigated to remove the organic debris that naturally exists in coffee manufacturing wastewater using chemical coagulation-flocculation and advanced oxidation procedures (AOP). Under acidic circumstances, the efficacy of removing natural organic matter with commercial flocculants, UV/H2O2, UV/O3, and UV/H2O2/O3 procedures was assessed. To maximize the treatment effectiveness of the coffee wastewater, several operational parameters were investigated for each of these procedures.

Low total suspended particles and a high chemical oxygen demand (COD) are characteristics of coffee wastewater. Reductions in COD, color, and turbidity were used to evaluate the effectiveness of the coagulation-flocculation and photodegradation methods used to treat coffee effluent. It was discovered that chemical coagulation-flocculation treatment of the coffee wastewater could achieve a 67% COD reduction.

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