Compound sludge conditioner for sludge dewatering

Abstract

The invention discloses a compound sludge conditioner for sludge dewatering, which comprises the following raw materials by mass percentage: 10-20% of oxidant, 30-60% of sludge conditioning bulking agent, 25-55% of inorganic flocculent and 5-10% of cationic polyacrylamide, wherein the wherein is at least one of sodium ferrate, potassium ferrate, sodium percarbonate and sodium hypochlorite; the sludge conditioning bulking agent is at least one of 50-200-mesh pulverized fuel ash, calcined kaoline and magnetite tailing powder; and the inorganic flocculent is at least one of polymeric aluminum ferric chlorine sulfate, polymeric aluminum ferric sulphate and polymeric aluminum ferric silicate. The addition amount of the compound sludge conditioner is small and 5-15% of absolute dry weight of sludge; a dewatering rate is high; a water content of the sludge with a water content of 90-99% can be reduced to 40-60% after pressure filtration dewatering; and the reduction, stabilization, harmlessness and reclamation of the sludge are achieved.

Description

technical field [0001] The invention belongs to the technical field of sludge conditioning and dehydration, and in particular relates to a composite sludge conditioner for sludge dehydration. Background technique [0002] Sludge is solid, semi-solid and liquid waste produced in the sewage treatment process. Its components are complex. It is mainly composed of suspended solids, microorganisms, adsorbed organic matter, and microbial metabolites in sewage. At the same time, it is mixed with colloids in sewage. , fibers, animal and plant residues, metal salts and other mixed aggregates of complex components. With the acceleration of the industrial and urbanization process and the development of the sewage treatment industry, the volume and degree of sewage treatment have been continuously improved, and the resulting sludge output has been increasing day by day. It is estimated that the sludge output of China's urban sewage treatment plants has exceeded 30 million tons per year....

AI Technical Summary

Problems solved by technology

At the same time, under the influence of factors such as the existence of a large amount of organic matter and the electric double layer on the surface of solid particles, the solid particles in the sludge form a stable colloidal suspension with the hydration layer wrapped on the surface, and the sedimentation performance and dehydration performance are very poor. Increased the difficulty of sludge dewatering to a great extent