Chapter 6: 1. Define the coagulation and flocculation processes in a water treat

Question

Chapter 6: 1. Define the coagulation and flocculation processes in a water treatment system. Make sure you mention the purpose of each process, the speed of mixing and the detention time in the tanks 2. Disinfecting a. What are the two objectives of the disinfection unit in water treatment? b. What is the most commonly used method of disinfection in the U.S.? What is the advantages and disadvantages of this method? 3. The following are related to wastewater treatment: a. What is the main purpose of the primary, secondary and advanced treatment in a wastewater treatment facility? b. What is the percentage BOD removal in each of the primary and secondary treatment? c. What are the two commonly used approaches in the secondary (biological) treatment? What is the main difference between the two approaches? 4. Environmental laws controlling hazardous substances: a. What do the following stand for: CERCLA, RCRA, TSCA b. What is the main difference between RCRA and TSCA

Explanation / Answer

4. a.  CERCLA= Comprehensive Environmental Response, Compensation, and Liability Act

RCRA=Resource Conservation and Recovery Act

TSCA=Toxic Substances Control Act

4. b. The major difference between RCRA and TSCA is that RCRA is basically an approach for management of solid and hazardous waste at facilities that are currently operational, while TSCA is an approach that regulates the introduction of new or already existing chemicals.

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