What are the principles involved in removing biological nutrients from waste, and what is accomplished by doing so? Where do nitrogen and phosphate go in the process? Name and describe three methods...

What are the principles involved in removing biological nutrients from waste, and what is accomplished by doing so? Where do nitrogen and phosphate go in the process? Name and describe three methods of treating raw sludge, and give the end product(s) that may be produced from each method. How may sewage from individual homes be handled in the absence of municipal collection systems? What are some problems with these on-site systems?