Sludge dewatering machine Stabilization method of
1. Anaerobic digestion:
Through hydrolysis, acidification, acetic acid production, methanogenesis and other processes, thermophilic anaerobic microorganisms are used to reduce the amount of volatile solids in sludge and kill pathogens such as parasite eggs. It is generally believed that when the amount of volatile solids in the sludge decreases by about 40%, it can be considered that the stability of the sludge has been achieved.
In sludge, organic matter mainly exists in solid state. Therefore, in the anaerobic digestion of sludge, hydrolysis and liquefaction of solids are considered as the main control processes. The process of generating methane in the anaerobic treatment of wastewater is to control the anaerobic reaction of the whole wastewater
2. Lime stabilization method:
Add sufficient lime to the sludge to make the pH value of the sludge higher than 12 and inhibit the growth of microorganisms.
3. Heat treatment method:
It can kill microorganisms to stabilize sludge. It can also destroy the colloidal property between sludge particles and improve the dewatering performance of sludge.
4. Common methods:
Digestion (anaerobic biological treatment), aerobic digestion, chlorination oxidation, lime stabilization and heat treatment, etc.
5. Scope of application of the above methods: digestion method (anaerobic biological treatment method) is mostly used in large sewage treatment plants (more than 100000 tons/day); Other methods can be used for small sewage treatment plants (stations). Whether to adopt stabilized sludge shall be determined according to economic analysis.
6. Aerobic digestion:
The aerobic digestion method is similar to the activated sludge method. It is carried out in the aeration tank for about 10~20 days. The organic composition in the sludge is stabilized by the aerobic metabolism of organic matter and the endogenous metabolism of microorganisms.
7. Chlorine oxidation method:
It is completed in a closed container, adding more chlorine to the sludge, and the contact time is not long; Essentially, it is mainly for disinfection and sterilization of microorganisms to stabilize sludge.
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