Landfill leachate nanofiltration concentrate treatment method

Abstract

The invention provides a landfill leachate nanofiltration concentrate treatment method. The method comprises the following steps: pumping a landfill leachate nanofiltration concentrate into a reaction tank, adding a coagulant, an antifoaming agent and a flocculating agent into the reaction tank, and reacting; allowing the obtained concentrate to go through a pipeline and flow into a precipitation pool, and carrying out solid-liquid separation to obtain precipitated sludge and a precipitated clear liquid; pumping the precipitated sludge into a dehydrator for separation, sending the generated dehydrated clear liquid and the precipitated clear liquid to a microelectrolysis reactor, and oxidizing; adding an alkali to oxidized water to adjust the pH value to 7-9, sending the obtained water to an ozone reaction tank for further oxidation, and introducing ozone generated by an ozone generator into an ozone reaction tank for aeration; and returning the treated nanofiltration concentrate to a biochemical system. The method ingeniously combining a physical and chemical reaction with a biochemical technology has the advantages of stable running, easy operation and maintenance, low running cost and high treatment efficiency, and partially solves the carbon source insufficiency problem of landfill leachate.

Description

【Technical field】 [0001] The invention relates to a method for treating landfill leachate nanofiltration concentrate. 【Background technique】 [0002] At present, the main process of landfill leachate treatment is membrane biochemical reaction (MBR) + nanofiltration + reverse osmosis. Landfill leachate nanofiltration concentrate is the liquid intercepted by the nanofiltration membrane. It has a high concentration of organic pollutants, and most of them are non-degradable and refractory organic substances and inorganic salts such as heavy metals. The B / C ratio is generally 0.01, and there is basically no ammonia nitrogen. , the treatment is difficult, if it is discharged directly without treatment, the COD index will seriously exceed the relevant national standards. Landfill leachate has high ammonia nitrogen concentration, relatively low organic pollution concentration, serious imbalance of C / N ratio, and insufficient carbon source. Generally, methanol, glucose, high-concent...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for treating landfill leachate nanofiltration concentrated liquid. The method combines physical and chemical reactions and biochemical processes ingeniously to form a stable operation, easy operation and maintenance, and low operating costs. The treatment efficiency is high, and it also partially solves the problem of insufficient carbon source of landfill leachate

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