Comprehensive treatment method for recovered and used humic acid in garbage infiltration liquid

A technology for comprehensive treatment of landfill leachate, which is applied in the comprehensive treatment of humic acid recovery and utilization in landfill leachate, and in the field of landfill leachate treatment, can solve the problems of difficult to meet treatment requirements, high operating costs, waste of resources, etc., and achieve The effect of small investment, reduction of sewage charges, and mitigation of environmental pollution

Inactive Publication Date: 2007-10-03
LANZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Years of research and practice have shown that it is often difficult to meet the treatment requirements for leachate treatment by purely physical, chemical or biochemical methods (Environ Chem Lett (2006) 4: 51-61)
In recent years, although some more mature and cost-effective leachate treatment processes have emerged: such as adjustment + ammonia nitrogen stripping + A / SBR, adjustment + A 2 / O biological denitrification system + NF, adjustment + pH adjustment + SBR + continuous nanofiltration + reverse osmosis and other combined treatment technologies, but there are still problems of high operating costs and waste of resources

Method used

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  • Comprehensive treatment method for recovered and used humic acid in garbage infiltration liquid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 2 liters of landfill leachate, the flocculant is cationic polyacrylamide, hydrochloric acid

[0030] Landfill leachate: cationic polyacrylamide: hydrochloric acid = 1: 0.0002: 0.01

[0031] 2L landfill leachate is removed impurity through rough filtration, and measuring TOC and COD are 3402mg / L and 11500mg / L respectively; Put into beaker, add 20ml hydrochloric acid acidification at room temperature, adjust pH to be 4.0; Add 0.4ml 10% (by weight percentage) of cationic polyacrylamide, stirred at a stirring speed of 3000-4000r / min for 10min, settled for 80min, and centrifuged to obtain 24g (dry weight) of humic acid; determined by potassium dichromate oxidation method, its content was 91.5 %. The measured landfill leachate TOC and COD were 527.3mg / L and 1311mg / L respectively, and the removal rates reached 84.5% and 88.6% respectively.

[0032] The supernatant was adsorbed and filtered with magnesium-type modified slag to further remove pollutants in the leachate. After ...

Embodiment 2

[0035] Example 2 Landfill leachate is 8 liters, and the flocculant is polyferric sulfate, sulfuric acid

[0036] Landfill leachate: polyferric sulfate: sulfuric acid = 1: 0.0006: 0.004

[0037]8L landfill leachate is removed impurity through coarse filtration, and measuring TOC and COD are 3402mg / L and 11500mg / L respectively; Put into beaker, add 32ml sulfuric acid to acidify at room temperature, adjust pH to be 5.0; Add 4.8ml 10% (by weight Percentage) of polyferric sulfate, stirred at a stirring speed of 3000-4000r / min for 10min, settled for 80min, and centrifuged to obtain humic acid 99g (dry weight); measured by potassium dichromate oxidation method, its content was 91.5% . The measured landfill leachate TOC and COD were 483.1mg / L and 1219mg / L, and the removal rates reached 85.8% and 89.4%, respectively.

[0038] The supernatant is adsorbed and filtered with magnesium-type modified slag (preparation method is the same as in Example 1), further removes pollutants in the l...

Embodiment 3

[0040] Example 3 8 liters of landfill leachate, anionic polyacrylamide, phosphoric acid

[0041] Landfill leachate: anionic polyacrylamide: phosphoric acid = 1: 0.0004: 0.005

[0042] 8L landfill leachate is removed impurity through rough filtration, measure TOC and COD to be 3402mg / L and 11500mg / L respectively; Put into beaker, add 40ml phosphoric acid acidification at room temperature, adjust pH to be 5.5; Add 3.2ml 10% (by weight percentage) of anionic polyacrylamide, stirred at a stirring speed of 3000-4000r / min for 10min, settled for 80min, and centrifuged to obtain 98g (dry weight) of humic acid; determined by potassium dichromate oxidation method, its content was 90.5 %. The measured landfill leachate TOC and COD were 571.5mg / L and 1415mg / L, and the removal rates reached 83.2% and 87.7%, respectively.

[0043] The supernatant is adsorbed and filtered with magnesium-type modified slag (preparation method is the same as in Example 1), further removes pollutants in the l...

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Abstract

A process for reclaiming the humic acid in the percolated liquid of garbage includes such steps as filtering, regulating pH=1.0-5.5, adding flocculant, fast stirring, settling, depositing, separating to obtain humic acid, adsorbing and filtering supernatant, regulating pH=6-8, and reusing it to garbage burying field.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a treatment method for landfill leachate, in particular to a comprehensive treatment method for recycling humic acid in landfill leachate. Background technique [0002] Sanitary landfill is the main way to dispose of municipal solid waste. This method is widely used because of its low cost, reliable technology and good operability. Landfill leachate is one of the most common "secondary pollution" in the process of garbage collection, treatment and disposal. It is recognized in the world as a high-concentration organic wastewater with a large pollution threat, complex components, and difficult to treat. It contains difficult-to-biodegrade Humic acid, naphthalene, phenanthrene and other non-chlorinated aromatic compounds, chlorinated aromatic compounds, phosphate esters, phthalates, phenolic compounds, aniline compounds and various metal ions, among which humic acid It can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/66C02F1/52C02F1/28C02F1/32B01J20/30C08H5/00C02F103/06C08H99/00
Inventor 陈强袁九毅
Owner LANZHOU UNIVERSITY
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