Key Points In The Selection Of Water Treatment Process
The quality of domestic sewage is generally stable, and the general treatment methods include Acidification, Aerobic biological treatment, Disinfection, etc.
Industrial wastewater shall be reasonably selected according to the specific water quality.
In particular, for wastewater sewage water treatment with aerobic biological treatment process, attention should be paid to the biodegradability of wastewater, which usually requires COD/BOD 50.3. If the requirements cannot be met, anaerobic biological hydrolysis acidification can be considered to improve the biodegradability of wastewater, or non biological treatment physical or chemical methods can be considered.
1. Sewage Treatment Degree
It is the main basis for the selection of sewage treatment process. In principle, the degree of sewage treatment depends on the water quality characteristics of sewage, the destination of treated water and the self purification capacity of the water body into which sewage flows.
However, at present, the determination of sewage treatment degree is mainly subject to the requirements of relevant legal systems and technical policies. Generally, the discharge concentration of sewage is controlled according to the Integrated Wastewater Discharge Standard and Relevant Industrial Discharge Dtandards. Some regions with higher economic development level also have more stringent Local Discharge Standards.
Therefore, no matter what kind of sewage needs to be treated, and no matter what treatment process and degree of treatment are adopted, it should be based on and premise that the effluent of the treatment system can reach the standard. Prevent and control water environment pollution according to the requirements of laws, regulations and policies.
2. Construction And Operation Costs
When considering the cost of construction and operation, the precondition is that the treated water meets the water quality standard.
On this premise, attention should be paid to the process flow with low construction and operation costs. In addition, reducing the floor area is also an important measure to reduce construction costs. The degree of difficulty of project construction.
3. Difficulty Degree Of Project Construction
The difficulty of project construction is also one of the factors affecting the selection of process flow.
If the groundwater level is high and the geological conditions are poor, it is not suitable to select the treatment structures with large depth and high construction difficulty.
4. Local Natural And Social Conditions
Local natural and social conditions Local terrain, climate and other natural conditions also have a certain impact on the selection of wastewater treatment process.
If the local climate is cold, the process that can operate normally in low temperature season after taking appropriate technical measures shall be adopted to ensure that the water quality reaches the standard. Local social conditions, such as raw materials, water resources and power supply, should also be considered in process selection.
5. Amount Of Sewage
In addition to the water quality, the quantity of sewage is also one of the influencing factors.
For sewage with large changes in water quantity and quality, the process with strong impact load resistance shall be considered first, or buffer equipment such as regulating tank shall be considered to minimize adverse effects.
6. Whether There Are New Contradictions In The Process Of Handling
Attention shall be paid to whether secondary pollution will occur during sewage treatment.
For example, pharmaceutical wastewater contains a large amount of organic substances (such as benzene, toluene, bromine, etc.), and organic waste gas will be discharged in the process of aeration, which will affect the surrounding atmospheric environment; The waste water from the gasification of the fertilizer plant is recycled after sedimentation and cooling treatment. The tail gas of the cooling tower will contain cyanide, which will pollute the atmosphere; In the wastewater treatment of pesticide factory, dimethoate is degraded by alkalization method. If lime is used as alkalization agent, the sludge generated will cause secondary pollution; The disposal of sludge is a key consideration in the wastewater treatment of printing and dyeing or dye plants.
In a word, the selection of wastewater and sewage water treatment process should comprehensively consider various factors, and a conclusion can be drawn only through technical and economic comparison of various schemes.
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