Method for recycling ammonia nitrogen from garbage leachate by using film coagulate contact reactor

Abstract

The invention discloses a method for recovering ammonian from the refuse percolate through a membrane coagulation contact reactor, and relates to a treatment method for the refuse percolate. The invention provides a method for recovering ammonian from the refuse percolate through the membrane coagulation contact reactor and a device thereof. The device is provided with a water inlet system, a membrane coagulation reactor, a membrane contact reactor, an absorption liquid vessel, an aeration pipe, an air pump and suction pump. The method comprises the following steps: sending the refuse percolate into the membrane coagulation reactor, and communicating a water outlet end and a recovery water pipe; adding a water treatment medicament into the membrane coagulation reactor, opening the air pump for aeration, obtaining the pretreated refuse percolate, sending the refuse percolate into a hollow-fiber membrane silk external passage via the membrane contact reactor through pressurization, and discharging the refuse percolate via a wastewater outlet end of the membrane contact reactor after the ammonian is removed; and sending a sulphuric acid solution into the membrane contact reactor, sending the sulphuric acid solution into a hollow-fiber membrane silk internal passage, discharging the sulphuric acid solution via an absorption liquid outlet end of the membrane contact reactor after the ammonian is absorbed, reflowing the sulphuric acid solution to the membrane contact reactor, and utilizing the absorption liquid cyclically till the absorbing capacity of the absorption liquid is saturated.

Description

technical field [0001] The invention relates to a treatment method of landfill leachate, in particular to a method for recovering ammonia nitrogen from landfill leachate by using a membrane coagulation contact reactor. Background technique [0002] Landfill leachate is a kind of difficult-to-treat high-concentration organic wastewater, which is characterized by large fluctuations in water quality and volume, complex components, and high content of toxic and harmful substances. The treatment of landfill leachate has become a major topic of environmental pollution control in my country at present and for a long time to come (Shen Huan, Jin Qiting, Cui Xiqin, et al. Experimental research on the treatment of urban landfill leachate by an upflow anaerobic sludge bed[J ]. Environmental Pollution Control Technology and Equipment, 2004, 5(4): 1-5). Among them, landfill leachate has high ammonia nitrogen content and is more difficult to treat. At present, the research on the new tec...

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Problems solved by technology

[0004] The stripping method is a relatively mature technology for removing ammonia nitrogen in leachate, but there are secondary pollution problems, and the treatment cost is high; the removal rate of electrochemical oxidation denitrification is high, and it is in the stage of small-scale research in China, and the power consumption is high; precipitation of magnesium phosphate Removal of ammonia nitrogen is a new method, and its sediment can be recycled to make compound fertilizer. The economic efficiency needs to be compared in detail, and the safety of the fertilizer should be scientifically verified; the reverse osmosis membrane separation technology can make many items in the leachate The indicator reaches the first-level emission limit, but the treatment cost is high; the biological denitrification technology is relatively mature, and there are many production applications. The new biological denitrification technology develops rapidly, and the treatment cost is relatively low, but only by biological treatment The technology cannot make the CODcr concentration in the leachate reach the secondary limit of leachate discharge

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