Answer:

(1) Organic pollution of water bodies: mainly refers to the pollution caused by the discharge of wastewater containing a large amount of organic matter from urban sewage, food industry and paper industry. In the process of biological oxidation and decomposition of these pollutants in water, a large amount of dissolved oxygen needs to be consumed. Once the oxygen supply in the water body is insufficient, the oxidation will stop, causing anaerobic fermentation of organic matter, emitting foul odors, polluting the environment, and poisoning aquatic organisms. Pollution of water bodies by salts. The first effect of pollution is to change the pH value of water, destroy its natural buffering effect, inhibit the growth of microorganisms, and hinder the self-purification of water bodies. At the same time, it will also increase the hardness of inorganic salts and water in the water, which will adversely affect industrial and domestic water.

(2) Inorganic pollution of water bodies: refers to acids, alkalis and inorganic.