Water resources. Water resources are the most important for the living of human beings of all. Human use of water resources in nature to consumption, consumer industry, the transport, agriculture, fishery, etc.Especially in large cities because of the modified state to use in other businesses Many of the remaining water is changed into a drain, water is the rotten have black smells disgusting.Do harm to the creatures that live in water that both direct and indirect conditions such as water pollution (water pollution). The wastewater is also the source microorganism species.Make a connection and it may spread to the epidemic, such as cholera, ty foil. Etc. wastewater some types may make the water temperature change. Such as waste water from power plant, some kind of industrial wastewater treatment8 mg / L or 8 ppm (PPM), the amount of dissolved oxygen in the water will change constantly. The causes that the amount of oxygen that can be easily changed, is organic, and temperature.As the amount of oxygen dissolved in the water (dissolved oxygen) or short that DO is measured in mg / L, the value of DO. Under 3 mg / L, respectively. The problem of water waste water pollution is the waste water from various sources.
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