Sludge dewatering is an important link in the sewage treatment process, and it is very important to choose the right agent to improve the dewatering efficiency and reduce the cost. As a sludge conditioner manufacturer, we have rich experience and professional opinions on the selection of sludge dewatering agents. The following is a detailed explanation of sludge dewatering agents:
Classification of sludge dewatering agents
Sludge dewatering agents are mainly divided into inorganic agents and organic agents.
Inorganic chemicals
Polyaluminum chloride (PAC) : also known as water purifier, because of its appearance is yellow particles or powder named xanax. It has good flocculation effect and is suitable for sludge with low organic content, such as sludge in coal washing plants and sand washing sites.
Polyferric aluminum chloride, polyferric sulfate, ferrous sulfate, basic aluminum chloride, ferric chloride: These ferric salt agents are also more effective and cheaper inorganic agents. After the addition, the sludge concentration can be greatly accelerated and the effect of filtration dehydration can be improved. However, the amount of it is larger, generally 5% to 20% of the absolute dry weight of the sludge, so the cake volume increases.
Organic chemicals
Polyacrylamide (PAM) : Also known as flocculant, some industries call it white medicine. Because its appearance is white small particles or powder, and the flocculation effect is very good, it is used as a common product of sludge dewatering agents. Polyacrylamide cation, in the inorganic content of high sewage sludge anion selection effect is good, such as sand washing, coal washing and other industries; It is better to choose cationic polyacrylamide in industries with high organic content, such as food, aquaculture, slaughtering, municipal sewage and other industries.
Sludge conditioner: containing water purification agent, organic polymer, sludge stripping agent, wall breaking agent degreaser, sludge surface structure modifier and other components, is a chemical agent that can change the surface structure of the sludge, reduce the solid surface load of the sludge, the specific surface area of the sludge surface, and destroy the bacterial structure. Generally used in the plate and frame filter press, it can make the sludge better break the wall, precipitation more sewage, make the sludge moisture content is lower and the mud is drier, do not cause the sludge increment, the sludge will not have a sticky state, will not cause the situation of sticky filter cloth.
Two, the principle of drug selection
Selection according to sludge properties: different sludge properties (such as organic matter content, inorganic matter content, pH value, etc.) need to choose different agents. For example, sludge with high organic content is more suitable for cationic polyacrylamide selection.
According to the selection of dewatering equipment: different dewatering equipment (such as belt filter press, plate and frame filter press, centrifuge, etc.) have different requirements for the agent. For example, sludge conditioner is more suitable for use in plate and frame filter presses.
Consider cost and effect: When selecting the agent, it is necessary to consider the cost and dehydration effect of the agent comprehensively, and choose the cost-effective agent.
Precautions for the use of drugs
Control dosage: The dosage of the agent needs to be determined according to the nature of the sludge and the requirements of the dehydration equipment, to avoid too much or too little resulting in poor dehydration effect or cost increase.
Uniform mixing: The agent needs to be fully mixed with the sludge to ensure that it plays the best dehydration effect.
Attention to safety: When using the drug, it is necessary to pay attention to its safety and environmental protection to avoid harm to the environment and the human body.
In summary, the selection of sludge dewatering agents needs to be comprehensively considered according to the characteristics of sludge, dewatering equipment, cost and effect. As a sludge conditioner manufacturer, it is recommended to consult professionals when selecting agents to ensure that the most suitable agent is selected and the best dehydration effect is achieved.