Compose a one-half page document that addresses the question associated with the scenario below. Your writing should present a clear analysis of the facts and a coherent explanation and/or solution addressing these facts that is supported by references (textbook, etc.).
Characterize the differences among untreated, primary-treated, and secondary-treated sewage and compare and explain the effects of dumping each type on the eutrophication of a pond and a fast-moving river.