The stable structure of sludge colloids and the large amount of bound water encapsulated by extracellular polymers are the core reasons for the high moisture content of filter cake in belt press filtration. The sludge enhancer relies on a modified polymer compound system to form a triple synergy mechanism of efficient wall-breaking - powerful flocculation - channel optimization, which solves the dewatering problem from the microscopic structure level of sludge and is different from the traditional single flocculation mode of calcium, iron, and aluminum salts.
The first level of efficient cell disruption technology: The sludge enhancer incorporates active modified additives, which can break down the hydrophilic protective layer of EPS (extracellular polymeric substances) in the sludge, disintegrate the hydrated stable structure of microbial cells, and convert the intracellular bound water and adsorbed water that are difficult to remove into free gap water. Traditional lime and iron salts only rely on pH adjustment for weak cell disruption, and are unable to deeply separate the water bound by organic matter. The sludge cake is prone to having a soft center and excessive moisture content. The sludge enhancer does not require a strong acidic or alkaline environment. It can complete cell disruption under near-neutral conditions, and the filtrate pH remains stable and meets the standards, avoiding the risk of environmental penalties for acid and alkali waste liquid.
The second type of strong polymer flocculation bridging: The product adopts a long-chain structure modified by high-branched polymers. It rapidly neutralizes the negative charges on the surface of sludge particles, eliminating the electrostatic repulsion of colloids. At the same time, through molecular chain net capture and adsorption bridging, fine sludge particles are coagulated into dense and highly rigid flocs. The flocs have high compressive strength, and are not easily broken during the high-pressure plate and frame extrusion process. This avoids the clogging of filter cloth pores by fine particles, significantly improving the sedimentation speed and shortening the total cycle time for sludge intake and filtration. Traditional PAM alone only forms loose flocs, which are prone to collapse under pressure. The thickness of the single batch of sludge cake is thin and the output is limited.
The third-level drainage channel optimization technology: The sludge enhancer can reconstruct the microscopic pore structure of the sludge cake, creating continuous water-permeable channels between the flocs. During the filtration stage, water quickly penetrates the sludge layer and is discharged. When using traditional inorganic salts for conditioning, the hydrolyzed precipitates of calcium and iron ions will fill the pores and block the drainage channels, prolonging the filtration time and significantly increasing the total solid content of the sludge. This product does not contain inert inorganic salt increments. After conditioning, the pores of the sludge cake are transparent, and the filtration cycle is shortened by more than 40%, with a complete and uniform sludge cake formation and uniform thickness.
Under the simultaneous action of the three mechanisms, the sludge does not require a large amount of lime or iron salts as auxiliary substances. The dosage of the chemicals is significantly reduced, and there is no excessive inorganic residue left in the sludge cake. This solves the four major industry pain points of large dosage of conditioning agents, increased sludge volume, acid-base imbalance in the filtrate, and low filter press efficiency from the technical bottom layer.