Wastewater

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http://cse.ucpress.edu/content/early/2017/06/13/cse.2017.sc.450561

· A- What’s the current overall state of water quality in western Lake Erie?

· B- How have agricultural practices affected water quality in Lake Erie?

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http://cse.ucpress.edu/content/early/2017/09/07/cse.2017.000604#sec-9

· If you lived in West Virginia in February 2014 (a month after the spill), would you drink the water or serve it to your family members? What information would you draw on to make your decision? Now, step into the shoes of the water provider. Would you tell your customers that the water is safe to drink? Why? If your answers changed, why do you have a different safety threshold as an individual versus as a water provider? Would you have a different safety threshold for yourself than for a child under your care?

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http://cse.ucpress.edu/content/early/2017/09/07/cse.2017.000604#sec-9

· The case discusses several laws that were designed to prevent a chemical spill and/or reduce impacts to human health, including the Toxic Substances Control Act, the Clean Water Act, the Safe Drinking Water Act, and the Emergency Planning and Community Right to Know Act. Why did these laws—individually and as a group—fail to prevent the disaster?

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http://cse.ucpress.edu/content/early/2017/09/07/cse.2017.000604#sec-9

· Imagine that you have been hired to direct a special task force that seeks to ensure that this type of accident never happens again. You have been asked to recommend a series of technical and regulatory reforms and discuss how those reforms would have helped prevent the Elk River spill or lessen its consequences. What would you recommend to reform the regulation or implementation of regulations? Why? Of the reforms you recommended, which do you think are reasonable precautionary steps? Why? In the absence of a severe disaster, how would you justify the costs?

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http://cse.ucpress.edu/content/early/2017/09/21/cse.2017.000265#sec-10

· After reading this case study, please explain how wastewater management can be addressed on life cycle assessment.

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-In its startup phase a BPR process (Chapter 15) is not removing phosphorus as anticipated by design calculations. What laboratory analyses would you ask to be performed to help assess the problem? Why?

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-Explain when a design engineer would select a rectangular rather than a circular secondary clarifier and what, if any, negative impacts this may have on performance.

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-Explain the difference between internal recycle and return activated sludge.

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-You are touring the environmental engineering research labs at your university. Two biological reactors are in a controlled temperature room that has a temperature of 35C. Reactor A has a strong odor. Reactor B has virtually no odor. What electron acceptors are being used in each reactor?

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-A wastewater treatment plant operator at an F/M ratio of 0.32/day is having trouble disposing of its sludge. The treatment plant operator knows that he must alter the F/M ratio to reduce the amount of sludge but cannot remember in which direction. Help the operator out by telling him which direction he should change the F/M ratio (higher or lower) and explain what effect this will have on the power requirements.