Flocculation precipitation is one of the most commonly used methods in sewage treatment. Its treatment principle is by adding chemical agents or polymer substances, so that suspended substances or colloidal substances in the sewage are gathered into large granular substances that are not easy to suspend, and then separated from the wastewater by natural precipitation or mechanical transportation.
Factors affecting flocculation effect
The process of floc growth is the process of contact and collision of small particles. The quality of flocculation depends on two factors:
- The polymer complex produced by the hydrolysis of the flocculant forms the connection capacity of the adsorption bridge, which is determined by the properties of the flocculant
What is the probability of small particles colliding and how can they be controlled to make reasonable and effective collisions
Advantages of flocculants for cleaning sewage
- The treatment effect is good: Because the small matter condenses into a large substance, gravity will act on the large substance, so that the solid matter and the sludge in the pool sewage are separated, and the purpose of purifying the water quality is achieved.
- Economy: Compared with other sewage treatment methods, the flocculation precipitation method has the advantages of simple operation, low cost, and convenient construction.
- Widely used: The rigid flocculation precipitation method is not only used to clean swimming pool sewage but is also widely employed in industrial wastewater treatment, domestic sewage treatment, leachate treatment, rainwater treatment, and other fields.
Flocculants clean sewage defects
- High energy consumption: Due to the need to add chemical agents to the flocculation precipitation method, a large amount of energy and chemical agents will be consumed when treating a large volume of pool sewage, thereby increasing treatment costs.
- Post-treatment problems: The treatment of sludge and sediment generated after flocculation precipitation is crucial, and its treatment and disposal need careful consideration.
Flocculants can be divided into the following categories:
Flocculation precipitation method is a more effective and low-cost pretreatment method. The main classification of flocculants is as follows:
Organic flocculant.
This type of flocculant is prepared based on the principles of polymer chemistry, exhibiting a high degree of flocculation and precipitation. Its main characteristics are relatively simple structure, low production cost, fast precipitation speed, and have certain treatment effects on different water quality.
Inorganic flocculant.
This kind of flocculant is made of inorganic substances, mainly including iron hydroxide, alumina, polyferric sulfate and so on. It has a strong electrochemical activity, can quickly reduce the concentration of particles in water, so as to purify water quality.
Microbial flocculant.
This is a new type of flocculant that is still being researched and developed.
Composite flocculant.
This kind of flocculant is a treatment method of mixing inorganic flocculant and organic flocculant, which can give full play to the advantages of both and achieve better flocculation effect.
The above is the main classification of flocculants, the specific use can be selected according to the actual needs of the appropriate flocculants.
Conclusion
To sum up, flocculation and sedimentation is a commonly used sewage treatment method, which can effectively purify sewage and has a certain economy and wide application, but there are still some problems that need to be further solved and explored.
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