A method for recycling sludge resources in stages by quality and phase separation

摘要

#$%^&*AU2020102089A420201008.pdf#####ABSTRACT The invention discloses a method for recycling sludge resources in stages by quality and phase separation. The technical points of the method are as follows: Adjusting the solid content rate of sludge to 2-10%; After adjusting the pH of sludge with alkali, Thermal hydrolysis treatment is carried out; The thermal hydrolyzed sludge is centrifuged to obtain an upper solution 1 and a solid sludge 1; The upper solution 1 is used as a liquid fertilizer after being conditioned; After the solid sludge 1 is washed to neutrality, the solid content is dilute to less than 10%; Adjust the pH of diluted solid sludge 1 with acid, followed by solid-liquid separation to obtain upper solution 2 and solid sludge 2; Placing the upper solution 2 in a dual-chamber electrolysis cell with a cation exchange membrane, collecting the anode solution and the cathode precipitation respectively, and reusing; After the solid sludge 2 is diluted and neutralized, sand is removed by hydrocyclone to separate sand and organic matter. According to the invention, the separation of organic matter and inorganic matter in sludge, recovery of metal and nutrient salt, preparation of liquid compound fertilizer are realized through "pH regulation + thermal hydrolysis + electrolysis cell + solid-liquid separation", and zero waste and high-value utilization of products in sludge treatment and disposal process are realized.Sewage Flocculants (Al Fe) Treatment Plant Liquid Compound Fertilizer SludgeX Liquid 1 Liquid (Ca Mg P) pH Controlled Fertilizer Phosporus Metals Thermal Hydrolysis Solid-liquid Sludge ~ Separation Lqi Conditioning Lqi Solid-liquid1 Electrolysis Cell Solid 1 pH 1 Separation Controlld Solid 2 Dissolution, Dilution and Neutralization Organic Matter - Dsrd~ Sand Figure 1