In the field of sewage treatment,high-efficiency new composite sludge conditioners are gradually replacing traditional conditioning materials such as lime and iron salts as key agents to improve sludge dewatering efficiency.This type of conditioner achieves the reconstruction of sludge particle structure and deep release of water through the synergistic action of multiple components.Its core components include four categories:inorganic metal salt polymers,organic polymer wall breaking agents,surface active modifiers,and skeleton building materials.Through composite mechanisms such as electro neutralization,adsorption bridging,and extracellular polymer cracking,the sludge moisture content is reduced from over 90%to 40%-60%,creating conditions for subsequent resource utilization.
Polyferric sulfate is also one of the commonly used iron salts,which can hydrolyze in water to produce products with adsorption and coagulation properties.Its hydrolysis products can adsorb small particles and colloidal substances in sludge,aggregate them into larger flocs,and improve the settling and dewatering performance of sludge.Compared with traditional iron and aluminum salts,metal salts in the form of polymers such as polyaluminum chloride and polymeric iron sulfate have higher charge density and larger molecular weight,which can more effectively exert coagulation effect,and the dosage is relatively small.
Lime also plays an important role in high-efficiency new composite sludge conditioners.Lime has alkalinity and can regulate the pH value of sludge.In some cases,the pH value of sludge may deviate from the appropriate range,affecting the dewatering performance and other treatment effects of sludge.By adding lime,the pH value of the sludge can be adjusted to an appropriate range,improving the chemical environment of the sludge.At the same time,lime can also undergo chemical reactions with certain substances in sludge,such as neutralizing with acidic substances in sludge,reducing the corrosion of sludge treatment equipment by acidic substances.In addition,lime can also have a certain disinfection effect,killing some microorganisms in the sludge and reducing the risk of odor and bacterial transmission during storage and treatment.
Polyacrylamide is a commonly used organic polymer conditioner,which can be classified into cationic,anionic,and nonionic types based on its ionic properties.Cationic polyacrylamide(CPAM)is widely used in high-efficiency new composite sludge conditioners.CPAM has a long-chain structure with positively charged groups on the molecular chains.When added to sludge,the long chains of CPAM can stretch and wrap around the surface of sludge particles.Its positively charged groups can undergo electrical adsorption with negatively charged groups on the surface of sludge particles,and through physical adsorption and chemical bonding,the dispersed sludge particles are connected to form larger flocs.This type of floc has good settling performance and can be quickly separated from water,thereby improving the dewatering efficiency of sludge.Compared with non-ionic and anionic polyacrylamide,CPAM has stronger adsorption and coagulation ability for negatively charged sludge particles,making it more effective in practical applications.
In addition to polyacrylamide,some natural or modified organic polymers have also been applied in high-efficiency new composite sludge conditioners.For example,chitosan is a natural biopolymer with good biocompatibility and degradability.Chitosan molecules contain active groups such as amino groups,which can adsorb and react chemically with the surface of sludge particles.It can change the surface properties of sludge particles,enhance the binding force between sludge particles,and promote the formation of sludge flocs.At the same time,chitosan also has certain antibacterial properties,which can inhibit the growth of microorganisms in sludge,reduce the decay and odor generation of sludge during the treatment process.
Biological enzymes play an important role in high-efficiency new composite sludge conditioners.Proteases can break down protein substances in sludge,lipases can break down fat substances,cellulases can break down cellulose,and so on.Sludge contains a large amount of organic matter,which exists in complex forms,increasing the difficulty of sludge treatment.Biological enzymes can specifically act on these organic substances,breaking them down into small molecules.For example,proteases can break down proteins into amino acids and peptides,lipases break down fats into glycerol and fatty acids,cellulases break down cellulose into glucose,and so on.Through the action of biological enzymes,organic matter in sludge is decomposed,disrupting the structure of sludge cells and releasing intracellular water and bound water,thereby improving the dewatering performance of sludge.Meanwhile,the decomposition products of biological enzymes can also provide favorable conditions for the subsequent utilization of sludge resources,such as serving as raw materials for biofertilizers or biofuels.
Microbial agents are also an important component of high-efficiency new composite sludge conditioners.Some specific microbial strains can play a role in biodegradation and stabilization during sludge treatment.For example,certain aerobic microorganisms can decompose organic pollutants in sludge and convert them into harmless substances such as carbon dioxide and water.Anaerobic microorganisms can decompose organic matter under anaerobic conditions,producing usable biogas such as methane.Microbial agents can also improve the microbial community structure of sludge,inhibit the growth of harmful microorganisms,and reduce odors and bacteria in sludge.Through the metabolic activity of microorganisms,the properties of sludge are improved,which is more conducive to subsequent treatment and disposal.For example,the composting effect of sludge can be improved,making it a high-quality soil amendment.
Surfactants play an auxiliary role in high-efficiency new composite sludge conditioners.It can reduce the surface tension of sludge particles and improve the wettability of sludge.The surface of sludge particles usually has a certain degree of hydrophobicity,making it difficult to separate water from the sludge.Surfactants can adsorb onto the surface of sludge particles,changing their surface properties and making it easier for water to separate from sludge particles.For example,some non-ionic surfactants can form a thin film on the surface of sludge particles,reducing surface tension and promoting water discharge.At the same time,surfactants can enhance the contact and interaction between other conditioning components and sludge particles,improving the overall effectiveness of the conditioning agent.
The function of dispersants is to prevent sludge particles from aggregating during the conditioning process.In the process of using high-efficiency new composite sludge conditioner,if the sludge particles agglomerate too early,it may affect the sufficient mixing and action of the conditioner with other components.Dispersants can adsorb onto the surface of sludge particles,forming a protective film that prevents direct contact and agglomeration between sludge particles.It can maintain the dispersed state of sludge particles,allowing the conditioner to evenly act on each sludge particle,thereby improving the conditioning effect.For example,some polycarboxylate dispersants can form a stable dispersion system on the surface of sludge particles,ensuring the smooth progress of the conditioning process.
E-mail：jcl@jichanglong.com
WhatsApp：+8618560709619
Address：Block B, Polymer Materials Industry Innovation Park,No. 51, Lutai Avenue, High-tech Zone, Zibo City, Shandong ProvinceOur company specializes in vanadium inhibitors , dehumidification and drying block, calcium hypochlorite disinfectant tablet, polyacrylamide and other products. With over 20 years of experience, we offer quality assurance and wholesale prices.
