Design a fine-bubble diffused aeration system to meet an oxygen demand of 5,000 kg/d. The plant is located at an elevation of 610 meters (2,000 ft). There are two aeration basins with a total volume equal to 5,400 m3. Assume the alpha and beta coefficients for the diffusers are 0.35 and 0.95, respectively and use … Read more
A two-stage high-rate trickling filter with 200% recycle will be used to treat 5.0 million gallons per day (MGD). The influent BOD to the primary clarifier is 225 mg/L and the primary removes 30% of the incoming BOD. The effluent BOD should be 20 mg/L or less. Assume that the design BOD loading to the … Read more
A two-stage high-rate trickling filter with 100% recycle will be used to treat 5,000 m3/d. The influent BOD to the primary clarifier is 220 mg/L and the primary removes 33% of the incoming BOD. The effluent BOD should be 20 mg/L or less. Assume that the design BOD loading to the trickling filter system is … Read more
Two biotowers operating in parallel are to be designed to treat a flow of 16,000 m3/d. The BOD5 in the influent to the primary clarifier is 200 mg/L and the clarifier removes 35% of the BOD5. The minimum wastewater temperature is expected to be 14∘C. The value of k is assumed to be 0.210 (Lps)0.5/m2 at 20∘C … Read more
Design a multi-stage RBC WWTP to treat the following wastewater for BOD removal. Influent flow = 6,000 m3/d, influent BOD5 = 260 g/m3, primary clarifier removes 35% of BOD5, total effluent BOD5 and effluent TSS = 20 g/m3, effluent soluble BOD5 (sBOD5) = 10 g/m3, and T = 10∘C. Determine: a. The number of stages … Read more
An aerobic digester is to be designed to stabilize 600 kg/d of primary sludge at 5% solids and 75% volatiles, along with 400 kg/d of waste-activated sludge at 1% solids and 75% volatiles. The volume of the combined sludge that will be fed to the digester is 104 m3/d. The minimum design operating temperature is … Read more
Assignment Content To better understand criminal behavior, we must also understand the elements of the crimes that are being committed. From this we can correlate crime and behavior while working toward predicting outcomes. Review the theories presented in Weeks 1-3. Choose three different crimes: one crime against persons, one crime against property, and one drug-related … Read more
An activated sludge WWTP produces an average of 100,000 gallons per day of primary sludge at 5% solids and 250,000 gallons per day of WAS at 1.1% solids. If the WAS is thickened to 6.0% solids by dissolved air flotation and then combined with the primary sludge prior to dewatering, what is the quantity (lb/d) … Read more
1. Food and water are both well-known vehicles for common source diseases. Explain how soil could act in a similar manner. 2. A number of infectious diseases can readily afflict human populations. Using the newspaper, magazines, or the WWW find a description of a disease outbreak that occurred sometime in the past decade. Once you … Read more
Identify whether each of the following hazardous compounds will be more likely to serve as an electron donor or electron acceptor during biological degradation. a. TNT (a common explosive; suspected carcinogen, causes liver damage). b. Trichloroethylene (used as a common degreaser and solvent; suspected carcinogen, causes liver damage). c. Pyrene (a component of coal tar, … Read more