Environment poster

Water pollution is caused by harmful chemicals in water reduction or loss ofusing value, and polluting the environment. Sewage includes acids, bases, oxidizers, cadmium, mercury, arsenic and other compounds. Also sewage is mixed with organic poisons, such as benzene, ethylene dichloride, ethylene glycol and others. These effects will poison aquatic organisms and influence drinking water sources, scenic landscape. Sewage microbial decomposition of organic matter is consumed oxygen in the water. It affects the lives of aquatic organisms. After the dissolved oxygen is depleted, anaerobic decomposition of organic matter to produce hydrogen sulfide, mercaptans and other unpleasant gas so that the water quality to deteriorate further.