A sewage treatment plant discharges 4 ML/d of effluent with 20.17 mg/L BOD5 into a stream. The stream discharge is 12 ML/d, and its initial BOD5 is 6.10 mg/L. The initial DO of the wastewater is 2.10 mg/L and in the stream, it is 7.91 mg/L. Assume the stream velocity is 0.31 m/s and the dissolved oxygen saturation concentration is 8.76 mg/L. The kd = 0.15 d-1 and kr = 0.31 d-1 values have been adjusted for temperature. Calculate the minimum DO in the stream and determine the distance (km) downstream that this minimum occurs. Is this a safe level for fish

Q: A 5-mL sample of sewage is diluted to 300 mL in a stan- dard BOD bottle. The initial DO in the…

A:

Q: A sample of silty clay has a volume of 14.88 cm³, a total mass of 28.81 gm, a dry mass of 24.83 am…

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Q: 1. Determine the 5-day 20°C BOD of a wastewater if the 3-day 10°C BOD is 100 mg/L. Assume a…

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Q: Poorly treated municipal wastewater is discharged to a stream. The river flow rate upstream of the…

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Q: A coagulation treatment plant with a flowrate of 0.05 m3/s doses with ferric sulfate at 20.0 mg/L.…

A: Given data, Flow rate = 0.05 m^3/s = 50 l/s = 432,0000 l/d Influent suspended solids = 36 mg/l…

Q: SS=4,000 mg/L raw wastewater has the following characteristics: w=12 MGD Os=220 mg/L pended solids…

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Q: 1. The required reactor detention time, 0. 2. The reactor basin volume, V, in m³. 3. The net waste…

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Q: sludge to meet their NPDES permit of 15 mg/L BOD5.  The mixed liquor concentration is 1,000 mg/L…

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Q: The BOD just downstream from a wastewater pipe is 12.9 mg/L and the DO (dissolved oxygen) is 8.6…

A: Given, BOD just downstream from wastewater pipe, L = 12.9mg/l DO at just downstream from wastewater…

Q: After primary treatment, a municipal wastewater contains 150 mg/L BOD5. The wastewater flow of 0.44…

A: To determine- Limiting value of biotreatment safety factor.

Q: A completely mixed activated sludge plant treats wastewater at a rate of 2,565 m³/d. The influent…

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Q: A completely mixed activated sludge process is being designed for a wastewater flow of 3 MGD using…

A: Q=3 MGD Influent soluble BOD=180 mg/L Effluent soluble BOD=10 mg/L The mean cell residence time () =…

Q: A steel pedestrian overpass must either be reinforced or replaced. Reinforcement would cost $52,000…

A: Given:Reinforced cost: $52,000Replacement cost: $180,000Additional service life: 20…

Q: A detention pond receives wastewater having a constituent concentration of 500 mg/L. A discharge…

A: Solution Given Data constituent Concentration = 500 mg/L Discharge concentration= 100 mg/L Flow…

Q: A 3 mL industrial wastewater sample is added to a BOD bottle (300mL).  The initial D.O.…

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Q: The chloride concentration in a brine waste flow of 6.3 L/s is 15000 mg/L. The river flow upstream…

A: step 1-

Q: The wastewater contains 7.5 x 105 fecal CFU per liter. The maximum permissible fecal coliform…

A: Given: Initial coliform concentration, Co = 7.5 x 105 CFU/L Maximum permissible coliform…

Q: At the point of mixing of a river and a wastewater point discharge, DO is 5.5 mg/L and DOs is 10.1…

A: It is required to find critical deficit of DO and minimum DO. Critical time of DO deficit and…

Q: Wastewater from a primary treatment tank is to undergo secondary treatment in an activated sludge…

A: Given data-Hydraulic retention time (t) is 6hMean cell residence time is 7 daysBOD content at inlet…

Q: problem 4: A wastewater treatment plant with an average daily flow of 0.25 m³/s must meet 30 mg/L of…

A: Part e) is not in your question but if you want it then only write otherwise leave that.

Q: A factory is discharging its wastewater into a slowly moving stream that has a mean velocity of 3…

A: Dissolved oxygen sag curve

Integrated Solid Waste Management

Integrated Solid Waste Management (ISWM) is a thorough waste suppression, compost, removal and recycling Program. An effective ISWM system considers how to suppress, manage and recycle solid waste in a manner that is most efficiently to protect human health and the surrounding. ISWM system requires evaluation of public wants and demands and then selecting and merging the most effective waste management activities for the proposed demands. The main ISWM activities for solid waste management are Waste prevention, Recycling and Composting, and Combustion and Removal and waste collection in a properly planned, constructed, managed and mitigated landfill areas. Each of these requires careful designing, financing, accumulation, and delivery of activities.