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Processing method of garbage leachate

A technology for landfill leachate and a treatment method, which is applied in the field of advanced treatment of landfill leachate, can solve the problems of increasing biological toxicity, unable to effectively remove ammonia nitrogen, affecting the biodegradability of leachate, etc. Simple to use effects

Inactive Publication Date: 2012-01-25
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Traditional coagulation and Fenton oxidation technologies cannot effectively remove ammonia nitrogen, which is the main pollutant in landfill leachate, which affects the biodegradability of leachate and increases its biological toxicity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take leachate from a landfill after anaerobic and aerobic treatment, water quality: COD 1400mg L -1 , TOC 490mg L -1 , NH 4 + -N 110mg L -1 , pH 6.3.

[0033] Add 600mg L -1 NaClO pre-oxidation, stirring at medium speed for 5 minutes, then adding 1000mg L -1 Fe 2+ With a certain proportion of NaOH, after stirring quickly and slowly, settle for 30 minutes. Add 1800mg L to the supernatant of coagulated water -1 Fe 2+ with a certain proportion of H 2 o 2 (Fe 2+ :H 2 o 2 =1:8), stirred at a medium speed for 1 h, and adjusted the pH to neutral after the reaction was completed. COD removal rate is 82%, TOC removal rate is 79%, NH 4 + -N removal rate was 78%.

Embodiment 2

[0035] Take the leachate from a landfill site treated by anaerobic and aerobic membrane bioreactors, water quality: COD 920mg L -1 , TOC 320mg L -1 , NH 4 + -N 180mg L -1 , pH 7.5.

[0036] Add 700mg L -1 NaClO pre-oxidation, stirring at medium speed for 5 minutes, then adding 1000mg L -1 Fe 2+ With a certain proportion of NaOH, after stirring quickly and slowly, settle for 30 minutes. Add 1500mg L to the supernatant of the coagulation effluent -1 Fe 2+ with a certain proportion of H 2 o 2 (Fe 2+ :H 2 o 2 =1:8), stirred at a medium speed for 1 h, and adjusted the pH to neutral after the reaction was completed. COD removal rate is 88%, TOC removal rate is 85%, NH 4 + -N removal rate was 81%.

Embodiment 3

[0038] Take leachate from a landfill after anaerobic and aerobic treatment, water quality: COD 2240mg L -1 , TOC 700mg L -1 , NH 4 + -N 320mg L -1, pH 5.2.

[0039] Add 800mg L -1 NaClO pre-oxidation, stirring at medium speed for 5 minutes, then adding 1000mg L -1 Fe 2+ With a certain proportion of NaOH, after stirring quickly and slowly, settle for 30 minutes. Add 2000mg L to the supernatant of coagulated water -1 Fe 2+ with a certain proportion of H 2 o 2 (Fe 2+ :H 2 o 2 =1:8), stirred at a medium speed for 1 h, and adjusted the pH to neutral after the reaction was completed. COD removal rate is 76%, TOC removal rate is 72%, NH 4 + -N removal rate was 85%.

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Abstract

The invention relates to a processing method of garbage leachate, which comprises the following steps: 1) adding sodium hypochlorite into garbage leachate to carry out preoxidation; 2) adding ferrous iron and hydroxide, stirring, and separating out the supernatant; and 3) adding ferrous iron and hydrogen peroxide into the supernatant, stirring, and regulating the pH value of the effluent water to reach the standard. Aiming at the garbage leachate after biochemical treatment, the invention is composed of sodium hypochlorite reinforced ferrous iron coagulation and Fenton technique. The sodium hypochlorite reinforced ferrous iron coagulation can remove nondegradable organic substances in the leachate, and generate active chlorine to effectively remove ammonia nitrogen. In the Fenton technique, ferrous iron and hydrogen peroxide in a certain proportion are added to generate hydroxy free radicals, thereby further oxidizing the organic substances and implementing partial mineralization, lowering the toxicity of the leachate and enhancing the biochemical quality of the leachate.

Description

technical field [0001] The invention belongs to the field of water treatment, in particular to a method for advanced treatment of landfill leachate by combining coagulation and Fenton oxidation techniques. Background technique [0002] Municipal waste landfill technology is widely used in waste treatment due to its low cost, mature technology, and convenient management. However, due to precipitation, surface runoff, and groundwater, landfill technology inevitably produces landfill leachate. Landfill leachate is a kind of sewage with high concentration of organic matter, complex types, high concentration of ammonia nitrogen, and a large amount of heavy metals. Although the traditional biochemical treatment method is widely used to treat leachate, its treatment effect is far from meeting the requirements because the leachate contains a variety of toxic and harmful refractory organic substances and high ammonia nitrogen content. At present, biochemical treatment is mostly used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/72C02F1/76
Inventor 赵旭曲久辉张宝峰
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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