Conditions that must be known about the choice of sewage treatment technology

Sewage treatment, wastewater formed by different reasons, difficulty in treatment of sewage, etc., require different wastewater treatment technologies.


Wastewater quality

  The quality of domestic sewage is usually relatively stable. The general treatment methods include acidification, aerobic biological treatment, and disinfection. Industrial wastewater should be rationally selected according to the specific water quality. In particular, for the treatment of wastewater by aerobic biological treatment process, attention should be paid to the biodegradability of wastewater. COD/BOD 50.3 is usually required. If it cannot meet the requirements, anaerobic biohydrolysis acidification can be considered to improve The biodegradability of wastewater, or the physical or chemical methods of non-biological treatment.

2. Degree of sewage treatment

  This is the main basis for the selection of wastewater treatment processes. The degree of sewage treatment depends in principle on the water quality characteristics of the sewage, the direction of the treated water and the self-purification capacity of the water flowing into the water. However, at present, the determination of the degree of sewage treatment mainly depends on the relevant legal systems and technical policies of the state. Generally, the environmental management department controls the discharge concentration of sewage according to the Integrated Wastewater Discharge Standard and related industry emission standards. Some areas with higher economic development levels also stipulate more stringent local emission standards. Therefore, no matter what kind of sewage needs to be treated, no matter what kind of treatment process and degree of treatment, it should be based on the premise that the effluent of the treatment system can reach the standard. Prevent and control water environmental pollution in accordance with the requirements of laws, regulations and policies.

3. Construction and operation costs

  When considering the construction and operation costs, it should be based on the premise that the treated water meets the water quality standard. Under this premise, the process flow with low construction and operation costs should be taken seriously. In addition, reducing the floor space is also an important measure to reduce construction costs.

4. Difficulty in construction

  The difficulty of engineering construction is also one of the factors influencing the selection of process flow. If the groundwater level is high and the geological conditions are poor, it is not suitable to use treatment structures with large depth and high construction difficulty.

5. Local natural and social conditions

  Natural conditions such as local topography and climate also have an impact on the choice of wastewater treatment process. If the local climate is cold, it should be used in the low temperature season after taking appropriate technical measures, and to ensure the process of achieving the standard water quality. Local social conditions such as raw materials, water resources and electricity supply are also factors that should be considered in the process selection.

6. The amount of sewage water

  In addition to water quality, the amount of sewage is also one of the influencing factors. For sewage with large changes in water quantity and water quality, the process of strong impact load resistance should be considered first, or buffer equipment such as adjustment tank should be considered to minimize adverse effects.

7. Does the process create new contradictions?

  Attention should be paid to the secondary pollution problem during the sewage treatment process. For example, pharmaceutical wastewater contains a large amount of organic matter, and organic waste gas is emitted during the aeration process, which affects the surrounding atmospheric environment. The gasification wastewater of the fertilizer plant is recycled after being treated by precipitation and cooling, and will be contained in the cooling tower exhaust gas. Cyanide, causing pollution to the atmosphere; in the treatment of dimethoate wastewater in the pesticide factory, the fruit is degraded by alkalization. If lime is used as the alkalizing agent, the sludge produced will cause secondary pollution; when printing or dyeing or dye factory wastewater treatment, The disposal of sludge is a key consideration. In short, the choice of sewage treatment process should take into account various factors, and the technical and economic comparison of various programs can be concluded.

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