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Prior to better regulatory control of metal release into domestic
wastewater systems, crown corrosion of sewer tiles was less of
a problem. Why?
Step by step
Solved in 2 steps
- In wastewater BOD level is high but in flowing surface water usually BOD level is very low. Explain.Why is reduction of BOD in wastewater a primary goal ofwastewater treatment? What are the consequences ofreleasing wastewater with a high BOD into local watersources such as lakes or streams?Which of the following is not a stage in purifi cation of drinking water: a. fi ltration c. activated sludge b. chlorination d. sedimentation
- Which of the following is not a stage in purification of drinking water?a. filtration b. chlorination c. activated sludge d. sedimentationDiscuss the microbial ecology contributing to crowncorrosion of concrete sewer lines. In considerationof this ecology, what intervention strategies might beuseful in reducing or eliminating corrosion?Leachate production is what
- A given municipal wastewater can be treated with the following methods. N + AS, Activated sludge with pre-denitrificationAS + N Activated sludge with post-denitrificationor UCT (Biological Phosphorus Purification designed at the University of Cape Town) Which process needs the greatest addition of lime? (choose the right answer) AS + N N + AS UCT Everyone needs the same amount of additivesThe table below shows the water quality results of palm oil mill effluent (POME)which you have analyzed in your laboratory. You are given a task to proposemitigation options for the palm oil mill after interpreting the findings. Interpretthe characteristics of POME and its potential effect on the aquatic system to helpyou in designing the mitigation options. Parameters Value Department of Environment (DOE) Limit pH 3.4 - 4.8 5 - 9 Biochemical Oxygen Demand (BOD) (mg/L) 25,000 - 43,750 100 Chemical Oxygen Demand (COD) (mg/L) 80,000 - 100,000 100 Oil and Grease (mg/L) 4,000 - 5,000 10A water quality control board reports that water is unsafe for drinking if the proportion of nitrate concentration exceeds 21% ppm. Water specimens are taken from a well. ?o: ??:
- Discuss the water treatment plants methods for treating water to make it potable and the contribution of detergents and other chemical waste to water quality. Compare and contrast two waterways where water contamination is extreme (i.e. the Ganges) and another (i.e. the Golden Horn of Istanbul) where waterways have been cleaned up and rehabilitated and discuss the contributing factors to both situations.A wastewater treatment plant discharges of effluent into a stream. Just upstream from the discharge point, the stream has an ultimate BOD of 5 mg/L.Assuming a cross-sectional area for the stream equal to 100 m2, what ultimate BOD (in mg/L) would you expect to find at a point of 15,000 m downstream?Wastewater Flow: 4 m3/secBOD (ultimate): 40 mg/LRiver Flow: 10 m3/secDeoxygeneation constant kd: 0.22 day-1Have the provisions of the Clean Water Act been effective? Discuss some of the methods we can adopt, in addition to “end-of-pipe” solutions, to prevent water pollution.