Research On Dewatering Of Anaerobic Digestion Sludge

A large number of poisonou and harmful material is transferred to the sludge from sewage, if it is not timely and effective to deal with the sludge could cause secondary pollution and damage the environment. After anaerobic digestion of organic matter in sludge under the action of microorganisms has been further degradation, it piay a role of stabilization of sludge. But anaerobic digestion sludge is colloid, tiny particles and heavy sludge viscosity, the characteristic is not conducive to the dewaterability of following sludge. Anaerobic digestion sludge has high basicity and consume too much conditioning drug. The topic is how to improve the dewaterability of digestion sludge,reduce the cost of sludge dewatering, seeking economic and suitable dehydration method. Based on the different types of conditioner regulate digestion sludge directly. Sludge specific resistance and mud cake moisture content is the index to measure the performance of sludge dewatering and the article discuss the different drug additive effect on the performance of sludge dewatering. In order to reduce the pharmaceutical dosage choose the way of elutriation to deal with anaerobic digestion sludge. And discuss the performance of sludge dewatering under the best parameters of elutriation elutriation in different types of the drug. To discuss the the economy of digested sludge dewatering,according to the reagent dosage and final disposal of sludge and mud cake moisture content respectively to establish the relationship between sludge treatment cost function model about mud cake moisture content,Under the function model of different agents at the lowest cost study drug dosing quantity and different dehydration.When respectively using CPAM,PAC,aluminium sulphate, and fly ash to deal with sludge, the best opsonize effect is CPAM. Many kinds of drug combination is superior to the single drug regulate the sludge dehydration.When adding the lime with a variety of reagents to deal with digested sludge the sludge specific resistance is 0.93×1012m/kg, mud cake moisture content is 60.63%, and the best reagent dosage is under the reaction conditions is studied. Above solution alkalinity of COD,calcium carbonate, elutriation and sludge specific resistance and mud cake moisture content after drug dosing quantity as an index, Double elutriation water ratio, 24 h of residence time and one-time is the best choice for elutriation. when add the CPAM,PAC, fly ash and lime together to regulate the sludge of elutriation, mud cake moisture content is 58.17%, the sludge specific resistance is 0.5×1012m/kg.Establish the cost function model of sludge treatment about mud cake moisture content, compare the cost of elutriation sludge to un-elutriation sludge under thesame drug control.The treatment cost of elutriation sludge is overall below un-elutriation.When the mud cake moisture content reaches 80%, 70% and 60%, the drug dosing of digested sludge respectively is adding the CPAM, elutriation after adding the CPAM and fly ash, elutriation four pharmaceutical joint dosing.