Do you know how to choose a sewage treatment process?
2015-05-15
Domestic sewage water quality is usually relatively stable, the general treatment methods, including acidification, aerobic biological treatment, disinfection and so on. The industrial wastewater should be based on the specific water quality of the rational choice of process. In particular, the use of aerobic biological treatment process wastewater treatment, attention should be paid to the biodegradability of wastewater, usually requires COD / BOD5> 0.3, such as can not meet the requirements, may consider anaerobic biological hydrolysis and acidification to improve The biodegradability of the wastewater, or the physical or chemical methods of abiotic treatment.
2. Sewage treatment degree
This is the sewage treatment process selection of the main basis. In principle, the degree of sewage treatment depends on the water quality characteristics of the sewage, the fate of treated water and sewage into the body's self-purification capacity. But at present, the degree of sewage treatment to determine the main compliance with the relevant state legal system and technical policy requirements. Environmental management is usually based on the "Integrated Wastewater Discharge Standard" and the relevant industry emission standards to control the concentration of sewage discharge, and some areas with high economic development level also provides for more stringent local emission standards. Therefore, no matter what kind of sewage needs to be treated, and no matter what kind of treatment process and degree of treatment should be to deal with the water system can be based on the premise and premise. In accordance with the laws, regulations and policies to prevent and control water pollution.
3. Construction and operating costs
When considering the construction and operating costs, water should be treated to meet water quality standards as a prerequisite. Under this premise, construction and operation of low-cost process should be taken seriously. In addition, reducing the floor area is also an important measure to reduce construction costs.
4. Construction of the degree of difficulty
The ease of construction is also one of the factors that affect the choice of process. Such as the high groundwater level, poor geological conditions, it is not appropriate to choose the depth of the construction of high-difficulty processing structures.
5. Local natural and social conditions
Local terrain, climate and other natural conditions on the choice of wastewater treatment process has a certain impact. If the local climate is cold, it should be used in the appropriate technical measures, in the cold season can also be normal operation, and to ensure that the water quality standards for the process. Local social conditions such as raw materials, water resources and electricity supply are also factors that should be considered in the choice of process.
6. The amount of sewage water
In addition to water quality, the sewage water is one of the factors. For water, water quality changes in the sewage, should first consider the ability to use strong anti-shock process, or consider the establishment of pool and other buffer equipment to minimize the adverse effects.
7. Whether the process creates new paradoxes
Sewage treatment process should pay attention to whether it will cause secondary pollution problems. For example, the waste water of pharmaceutical factory contains a lot of organic substances (such as benzene, toluene, bromine, etc.), in the aeration process will have organic emissions, the surrounding atmospheric environment impact; fertilizer plant gas wastewater in the use of precipitation, Recycling, in the cooling tower exhaust gas will contain cyanide, the pollution of the atmosphere; pesticide plant dimethoate wastewater treatment, the degradation of dimethoate method, such as the use of lime as alkalizing agent, resulting in sludge will cause the second Pollution; dyeing or dye plant wastewater treatment, the disposal of sludge as the key consideration. In short, the choice of sewage treatment process should take into account all factors, a variety of programs to compare the technical and economic conclusions.
