Does the sludge screw press machine use anions or cations?

 

When selecting coagulants for sludge screw press, the main factors considered include the properties of the sludge, organic matter content, alkalinity, etc. The following are the specific advantages of selecting anionic or cationic flocculants for sludge screw press:

Sludge properties: For sludge with high organic content, it is recommended to use cationic flocculants, as cationic flocculants such as cationic polyacrylamide (CPAM) have better dewatering effects on sludge, and the higher the degree of polymerization, the better the effect. Cationic flocculants can effectively dehydrate sludge by gravity before it enters the filter press, producing large flocs that do not stick to the filter cloth. They do not disperse during the filter press, require less dosage, and have high dewatering efficiency. The moisture content of the sludge cake is below 80%.

Sludge pH: The pH of sludge determines the form of hydrolysis products of flocculants, and the treatment effect of flocculants varies for sludge with different pH levels. For example, the hydrolysis reaction of aluminum salts is greatly affected by pH, and the reasonable pH range for its coagulation reaction is 5-7. However, the effect of pH on high-speed iron salt treatment agents is relatively small, and the reasonable pH range is 6-11.

Concentration of flocculant: The concentration of flocculant preparation affects the treatment effect and the consumption of chemicals. Generally, the lower the concentration of organic polymer flocculants, the lower the consumption of chemicals, and the better the treatment effect. However, high or low concentration in the preparation can affect the yield of mud cake.

Temperature of treatment solution: The temperature of sludge can affect the hydrolysis of coagulants. When the concentration of sludge is low, the effect will weaken, leading to a decrease in flocculation efficiency. This can be adjusted by extending the flocculation time. Generally, when using a dewatering system in winter, the temperature should not be lower than 15 degrees Celsius to reduce heat loss during sludge transportation.

Advantages of cationic flocculants: Cationic polyacrylamide exhibits cationic properties in acidic or alkaline media, and is highly effective in flocculation and precipitation of negatively charged suspended particles in wastewater, resulting in highly effective clarification. This type of wastewater generally carries a negative charge, so using cationic polyacrylamide is several times or tens of times more effective than using anionic polyacrylamide, nonionic polyacrylamide, or inorganic salts.

Application of anionic flocculants: Anionic polyacrylamide (APAM) is mainly used for flocculation, sedimentation, and clarification treatment of various industrial wastewater, such as steel plant wastewater, electroplating plant wastewater, metallurgical wastewater, coal washing wastewater, and sludge dewatering. It can also be used for clarifying and purifying drinking water.

In summary, when selecting coagulants for sludge screw press, it is necessary to decide whether to use anionic or cationic coagulants based on the specific properties and treatment requirements of the sludge, in order to achieve the best sludge dewatering effect.

 

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