--------------------------- regulates drinking water collection, treatment and distribution, and requires the EPA to set national standards for drinking water quality.
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--------------------------- regulates drinking water collection, treatment and distribution, and requires the EPA to set national standards for drinking water quality.
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- Question - There is a small spill of a toxic material on a paved surface of a chemical plant. This spill has width 0.8 ft and a length of 2.5 ft. The wind is a 10 miles per hour in the direction parallel to the length of the spill. Estimate the rate of evaporation in grams per hour. There is no toxin in the air at time 0 and at infinite distance from the spill. Assume air to behave as an ideal gas. Assume the toxic material can be considered an ideal solution with psat = 22 mmHg. MWtoxin = 164.4 g/mol, Ptoxin =1.69 g/cm³, Pair = .001225 g/cm³, Hair= 0.0187 CP, MWair = 28.9 g/mol, Dtoxin,air = 0.0888 cm²/s.How many gallons of 12-percent sodium hypochlorite solution are needed to disinfect a reservoir 20 feet in diameter and 6 feet deep? An initial chlorine dose of 80 milligrams per liter (mg/L) is expected to maintain a chlorine residual of over 50 mg during the 24-hour disinfection period.Describe briefly the nature and operation of rapid gravity filters used in drinking water treatment. Use sketches where appropriate.
- QUESTION 2 Supposing you were part of the students who visited Barekease water treatment plant for a practical session during the semester in Kumasi. During the session, you had face to face interaction with the Water Engineer in charge of the chemical treatment unit a.) Discuss four (4) key factors that affect the selection of a disinfectant ) Examine five factors that influence disinfection efficacy and microbial inactivation ) A dual media filter is composed of 0.30 m anthracite (mean particle size 0.20 mm) that is placed over a 0.60 m layer of sand (mean particle size 0.70 mm) with a filtration rate of 9.78 m/h. Assume the grains sphericity ф= 0.75and porosity (ε)=0.40. Determine the head loss in the clean filter?For each of the following indicate if the designated technology is appropriate forthe indicated water-quality problem. Explain why or why not (answer in no morethan a few sentences).a. A 60-micron household filter for cryptosporidium.b. Ion exchange for waste contaminated by radioactive cesium and strontium.c. A strong-base ion exchange resin for nitrate.d. Slow sand filtration for highly turbid water.e. Activated carbon for groundwater contaminated by BTEX (benzene, toluene,ethylbenzene, and xylene) from a gasoline spill.f. Filtration for taste and odour.g. Lime treatment for hardness of 90 mg/L as CaCO3.h. Ion exchange for hardness of 90 mg/L as CaCO3.i. Lime treatment for iron.j. Suspended sediment removal in a vigorously mixed fully-mixed tank.For each of the following indicate if the designated technology is appropriate for the indicated water-quality problem. Explain why or why not (answer in no more than a few sentences). e. Activated carbon for groundwater contaminated by BTEX (benzene, toluene, ethylbenzene, and xylene) from a gasoline spill. f. Filtration for taste and odour. g. Lime treatment for hardness of 90 mg/L as CaCO3.
- ______________ air pollutants are those with absolute national ambient air quality limits,whereas ________________ air pollutants need to be removed using best applicable controltechnologies (BACTs) Fill in the blanksChoices. (a) criteria, hazardous (b) hazardous, criteria, (c) toxic, particulate (d) PM2.5, organicAs the project engineer for your consulting firm, you are in charge of designing a flocculation tank to treat municipal drinking water. The design flow for the plant is 0.050 m3/s. The average water temperature is 10oC. The following design assumptions for the flocculation basin have been made:Number of tanks = 1Number of compartments in tank: 3Tapered G in 3 compartments: 60, 50, and 20 s-1Detention time = 30 min for entire flocculation basinDepth = 3 mTanks will have a square compartment plan (overhead) view1 Horizontal shaft paddle wheel per axis will be usedPaddle wheels will have 4 arms and 2 blades/armPaddle blades are 3 m long by 0.6 m wide. Assume blade spacing (diameter) of 1 and 2 m. Design the flocculation tank by providing the following for the first two compartments only:a) Tank and compartment dimensions in mb) Water power input in kWc) Rotational speed of the paddle wheel shaft in rpmThe air pollution control equipment on a municipal waste incinerator includes a fabric filter particle collector (known as a baghouse). The baghouse contains 424 cloth bags arranged in parallel, that is 1/424 of the flow goes through each bag. The gas flow rate into and out of the baghouse is 47 m3/s, and the concentration of particles entering the baghouse is 15 g/m3. In normal operation, the baghouse particulate discharge meets the regulatory limit of 24 mg/m3. when all 424 bags are in place and the emissions comply with the regulatory requirements: a) Calculate the fraction of particulate matter removed. b) Calculate the efficiency of particulate removal.
- Sanitary engineering laboratory The residual chlorine (Free chlorine) test write about everything The residual chlorineEnvironmental Engineering Lab what is the Standard test method to determine biochemical oxygen demand of a given water sample Please add your answer this : Theory Significance Guidelines Apparatus / ChemicalsUsed ProcedureThe Philippine Toxic and Hazardous Wastes Act places limits on the quantities of toxic substances thatmay be discharged into the sewerage system. Guidelines on hexavalent chromium (Cr6+) limits the dischargeamount to just 0.50 mg/L. If an industry dumps hexavalent chromium in the form of potassium dichromate(K2Cr2O7), what is the maximum allowable concentration of hexavalent chromium in % by volume and molesper liter of sewage water? Molar Mass: Cr=52, K=39.1, O=16