In wastewater BOD level is high but in flowing surface water usually BOD level is very low. Explain.
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In wastewater BOD level is high but in flowing surface water usually BOD level is very low. Explain.
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- Which of the following is not a stage in purifi cation of drinking water: a. fi ltration c. activated sludge b. chlorination d. sedimentationPrior to better regulatory control of metal release into domesticwastewater systems, crown corrosion of sewer tiles was less ofa problem. Why?Which of the following is not a stage in purification of drinking water?a. filtration b. chlorination c. activated sludge d. sedimentation