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Method for generating free radicals through activated peroxymonosulfate to treat landfill leachate

A technology of landfill leachate and monosulfate, applied in chemical instruments and methods, special compound water treatment, biological water/sewage treatment, etc., can solve the problems of low leachate treatment efficiency and difficulty in reaching national discharge standards, etc. To achieve the effect of reducing the content of heavy metals, moderate price and low production cost

Active Publication Date: 2017-09-01
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for treating landfill leachate by activating peroxymonosulfate (PMS) with secondary iron minerals, so as to solve the problem that the biological treatment method is not efficient in treating leachate with poor biodegradability, and the effluent is difficult to reach the national discharge standard, etc. The problem

Method used

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  • Method for generating free radicals through activated peroxymonosulfate to treat landfill leachate
  • Method for generating free radicals through activated peroxymonosulfate to treat landfill leachate

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specific Embodiment approach 1

[0024] Specific embodiment one: a kind of activated persulfate of the present embodiment produces the method for free radical treatment landfill leachate, and it is to carry out first according to the following steps:

[0025] Add secondary iron minerals and peroxymonosulfate that have been crushed through a 100-mesh sieve to the landfill leachate to be treated at a mass ratio of 1: (1-10) to control the amount of peroxymonosulfate in the landfill leachate. The concentration is 500-10000 mg / L, the reaction time is 60-360 minutes, the stirring state is kept during the treatment process, the water is discharged after precipitation, and the treated water is subjected to biological treatment, that is, the above-mentioned treatment of using secondary iron minerals to activate persulfate is completed landfill leachate.

specific Embodiment approach 2

[0026] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the peroxosulfate is potassium peroxosulfate, sodium peroxosulfate, ammonium peroxosulfate, calcium peroxosulfate, magnesium peroxosulfate One or more mixtures mixed in any proportion. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0027] Specific embodiment three: the difference between this embodiment and specific embodiment one is: when the pH of the landfill leachate to be treated>3, the secondary iron minerals are Shi's minerals, and when the pH of the landfill leachate to be treated<3 , Secondary iron minerals are minerals between Shi's minerals and jarosite. Others are the same as in the first embodiment.

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Abstract

The invention discloses a method for generating free radicals through activated peroxymonosulfate to treat landfill leachate and relates to a treatment method of the landfill leachate. The treatment method comprises the steps of adding crushed and sieved secondary iron mineral and peroxymonosulfate to the landfill leachate; stirring, reacting and then precipitating; and discharging effluent and then carrying out biological treatment. According to the method, an organic matter and the peroxymonosulfate can be adsorbed on the surface of the secondary iron mineral, the peroxymonosulfate and Fe<3+> on the surface of the mineral are subjected to Fenton-like reaction to generate SO4.<-> and the organic matter adsorbed on the surface of the mineral is degraded. The method has the characteristics that the treatment efficiency is high, a toxic and harmful by-product is not generated, the cost of the secondary iron mineral and the peroxymonosulfate is low, the method is easy to operate and the influences of water body conditions on reaction are small. The method is a landfill leachate treatment method integrating heavy metal removal and organic matter degradation.

Description

technical field [0001] The invention relates to a method for treating landfill leachate, in particular to a method for activating peroxymonosulfate to generate free radicals for treating landfill leachate. Background technique [0002] The landfill leachate has complex components, high toxicity, deep color, extremely high pollutant content, many organic components and heavy metals that are difficult to degrade and treat, and the water quality and quantity fluctuate greatly, so the treatment of landfill leachate is very difficult. Improper use will seriously pollute groundwater and soil, damage ecosystems, and endanger human health. [0003] Biological treatment is widely used in the treatment of landfill leachate because of its advantages of low operating cost and good treatment effect. Biodegradable macromolecular substances such as biodegradable substances increase, and the biodegradability of wastewater is getting worse and worse. The treatment effect of biological techn...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/72
CPCC02F1/281C02F1/725C02F3/00C02F2001/007C02F2101/20C02F2103/06C02F2305/026
Inventor 段杰斌刘奋武庞素艳郭钦
Owner HARBIN UNIV OF SCI & TECH
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