Method for processing membrane filtration concentrated solution of middle and late landfill leachate

Abstract

The invention relates to a method for processing membrane filtration concentrated solution of middle and late leachate in a refuse landfill and belongs to the technical field of the environment protection. The method comprises the following steps: adjusting a pH value of the membrane filtration concentrated solution to between 4 and 6.5; adding polymeric aluminium salt or a composite coagulating / flocculating agent the main component of which is polymeric aluminium salt into the adjusted membrane filtration concentrated solution, wherein the adding amount of Al2O3 serving as the polymeric aluminium salt or the composite coagulating / flocculating agent is between 50 and 1,000 mg / L; stirring the mixture for 0.5 to 5 minutes at a speed of between 100 and 280 revolutions per minute, and stirring the obtained product for 3 to 30 minutes at a speed of between 20 and 100 revolutions per minute; after the membrane filtration concentrated solution reacts with the polymeric aluminium salt or the composite coagulating / flocculating agent, carrying out solid-liquid separation; putting clear solution in an iron-carbon bed with a mass ratio of iron to carbon of 1 to 4, wherein the aeration rate is between 100 and 250 cubic meter air per cubic meter water per hour; carrying out micro-electrolysis reaction for 10 to 30 minutes; then adding H2O2 the mass concentration of which is 30 percent to strength micro-electrolysis reaction, wherein the adding amount of H2O2 is between 0.05 and 0.5 L per cubic meter water and the reaction time is between 0.5 and 3 hours; and adjusting the pH of the effluent to between 7.5 and 9.0 to obtain the processed effluent after the solid and the liquid are separated. The method has the advantages of simple operation, relatively lower operation cost, better processing effect and the like.

Description

technical field

[0001] The invention belongs to the technical field of environmental protection, and relates to the treatment of the membrane concentrate produced after the landfill leachate is treated with "biochemical method + membrane method advanced treatment", in particular to the mid-late stage nanofiltration membrane concentrate of the garbage landfill And the treatment of reverse osmosis membrane concentrate. Background technique

[0002] Sanitary landfill is currently the most important treatment and disposal method for domestic waste in my country, and it is also the main treatment method in most foreign countries. The actual treatment technologies for landfill leachate are: ① treatment technology combining biological and physical and chemical methods; ② biochemical method + membrane filtration as the main treatment technology; ③ leachate backfilling landfill method. However, the most effective treatment method for landfill leachate is "biochemical method + membra...