Technology for treating landfill leachate by non-biochemical process

Abstract

The invention relates to a technology for treating landfill leachate by a non-biochemical treatment. The technology for treating the landfill leachate by the non-biochemical treatment comprises the steps that S1, leachate electric flocculation air flotation sedimentation treatment is carried out; S2, leachate treated in S1 is treated by photodecomposition collaboration electrochemical reaction; S3, the leachate treated in S2 is treated by electric field collaboration photocatalytic oxidation reaction, after detection reaches the standard, non-biochemical treatment of the leachate is completed,if the detection does not reach the standard, S4 is conducted, specifically, the leachate treated in S3 is treated by electrochemical reduction reaction to complete non-biochemical treatment of the leachate. According to the technology for treating the landfill leachate by the non-biochemical treatment, a new technology and a new process for treating the landfill leachate by electric-light comprehensive reaction are adopted to completely replace physicochemical treatment and biochemical treatment and denitrification used at present, electric flocculation replaces coagulation, photodecomposition collaboration electrochemistry and electric field collaboration photocatalytic oxidation completely replace the biochemical treatment, electrochemical reduction reaction replaces the denitrification, and above all, emission indexes treated by the new process are superior to the household landfill pollution control standard (GB16889-2008).

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a non-biochemical process for treating landfill landfill leachate. Background technique [0002] Landfill leachate is a secondary pollutant produced in the waste treatment process. The change of leachate water quality is affected by factors such as waste composition, waste moisture content, waste body temperature, landfill time, landfill law, landfill process, rainfall infiltration, etc. impacts, especially rainfall and landfill time. [0003] The water quality of landfill leachate in my country mainly has the following characteristics: [0004] 1) The mass concentration of organic matter is high, and the leachate contains low molecular weight fatty acids, humic polymer carbohydrates and medium molecular weight grey fulvic acids. [0005] Among them, the macromolecular products synthesized by humic acid and amino acid are the main organic pollutants in the medium and long-term leach...

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Problems solved by technology

[0008] 4) High content of heavy metals: leachate contains a variety of heavy metal ions, and the amount of heavy metal ions dissolved when industrial waste and domestic waste are mixed is often higher

[0011] 7) The BOD / COD ratio is low. With the extension of the landfill time, the BOD / COD ratio is even lower than 0.1, indicating that the biodegradability of the stable period and old leachate is poor

[0014] 1) Large investment and large floor area

[0015] 2) It is difficult to reach the standard. In addition to dealing with high COD, high ammonia nitrogen, high heavy metals, and high chroma, there are still a considerable part of organic matter with poor viability, especially in the stable period and old leachate due to the decrease in the BOD / COD ratio. It becomes worse, and there are 200-1500mg / L of humic acid that cannot be biodegraded

[0016] 3) Poor control ability, including difficult to control the cultivation and viability of activated sludge bacteria

[0017] 4) The surrounding environment is poor, and a large amount of odorous gas discharged from large-area sewage pools cannot be treated, causing pollution to the factory area and the surrounding environment

[0018] 5) The large amount of solid waste, especially the large amount of sludge produced by secondary sedimentation, is not only a burden to the unit, but also a great pressure on the solid waste treatment department. For example, incineration will cause chlorine and aromatic hydrocarbons in the sludge Produce carcinogen dioxins, which will pollute groundwater if buried deep

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