10. A full cylindrical tank has a depth of 9 feet. After draining for 30 minutes, the tank has a depth of 4 feet. How long does it take to empty if the rate at which the depth of the liquid drops...
10. Write a one-page summary of the attached paper? INTRODUCTION Many problems can develop in activated sludge operation that adversely affect effluent quality with origins in the engineering, hydraulic and microbiological components of the process. The real "heart" of the activated sludge system is the development and maintenance of a mixed microbial culture (activated sludge) that treats wastewater and which can be managed. One definition of a wastewater treatment plant operator is a "bug farmer", one who controls the aeration...