Advanced landfill leachate treatment method

Abstract

The invention discloses an advanced landfill leachate treatment method which comprises a pre-treatment system, a positive osmosis separation system+a reverse osmosis separation system, and a MVR system. The advanced landfill leachate treatment method comprises the following steps: landfill leachate raw water enters the positive osmosis system for concentration after pre-treatment, namely mechanical filtration and pH adjustment, to obtain a concentrate and a diluted extracting solution; the diluted extracting solution enters the reverse osmosis system for effluent discharge after interception,the concentrate enters the MVR system for further concentration and solid-liquid separation, and ammonia nitrogen enriched in the MVR system can be recovered after being made into ammonium salt by anammonia nitrogen absorption system. The advanced landfill leachate treatment method disclosed by the invention has the benefits that the osmosis, the system and other physicochemical processes are adopted; the technological process is short and can realize the whole-process automatic control operation; the advanced landfill leachate treatment method is different from a biochemical treatment system; the advanced landfill leachate treatment method is less affected by human management factors and is more stable in treatment effect and low in operating strength; the MVR system is small in occupiedspace and less in process equipment input; due to the omission of biochemical processes and no need of adding pharmaceutical agents, the investment and operation cost are relatively low.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a garbage leachate treatment method. Background technique [0002] Domestic waste treatment methods mainly include incineration, composting, mechanical treatment and landfill, etc. No matter whether landfill or incineration is used, during the process of transportation, stacking and landfill of waste, due to anaerobic fermentation, decomposition of organic matter, and rainwater A variety of metabolic substances and water are produced due to washing, groundwater immersion and other reasons, forming a high-concentration organic wastewater with extremely complex components - landfill leachate; untreated landfill leachate will cause serious damage to the environment after flowing through the surface or infiltrating into groundwater. Therefore, the pollution control of landfill leachate has become an important part of the harmless treatment of waste. Landfill leachate treatment methods ma...

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Problems solved by technology

According to the "Technical Specifications for Leachate Treatment Engineering of Domestic Waste Landfill Sites" (HJ564-2010), the existing domestic waste leachate treatment process basically tends to anaerobic + multi-stage A / O (anoxic / aerobic) + MBR (membrane bioreactor) + UF (ultrafiltration) / NF (nanofiltration) / RO (reverse osmosis) one-stage or multi-stage membrane filtration combined process, the difference in the practice of each project is mainly reflected in the different regions and different types of filling Landfill, different sources of leachate, different discharge requirements, different equipment investment scales, selection of raw water hardness removal process, selection of anaerobic process, selection of built-in or external MBR membrane type, selection of NF and RO processes In terms of local adjustments, the technical system has large investment, large floor area, unstable operation, high proportion of concentrated liquid, and high ammonia nitrogen treatment cost; there is also the introduction of MVR (steam mechanical recompression technology) technology to treat landfill leachate. However, judging from the current technology, before the landfill leachate enters the MVR evaporator, complex pretreatment is often required for the leachate. Coagulation, flocculation, precipitation and other steps, and then enter the MVR evaporator after filtration and heat exchange. The processing steps are complicated and difficult to operate, and more chemicals need to be added. increase cost

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