Safe and high-efficiency combined technology for landfill leachate nanofiltration concentrated solution treatment

A technology of landfill leachate and concentrate, which is applied in the direction of polluted groundwater/leachate treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Emissions and other issues, to achieve the effects of low content of toxic by-products, saving acid and alkali reagents, and improving current efficiency

Active Publication Date: 2018-01-05
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patents CN105130088B, CN104478157B and CN104478157A all use a combined process including flocculation precipitation-advanced oxidation to treat the nanofiltration concentrate, but the above two-step physical and chemical treatment cannot make the nanofiltration concentrate discharge up to the standard
In order to strengthen the treatment, the first two patents are discharged into the biological treatment system for further treatment after significantly reducing the organic load and improving the biodegradability, while the patent CN104478157A uses two-step advanced oxidation, that is, electrolysis and ozone oxidation series process for treatment, although the effect can be strengthened , but the humic acid in the concentrate will react with the active chlorine produced in the electrolysis process to generate toxic by-products, resulting in stronger toxicity

Method used

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  • Safe and high-efficiency combined technology for landfill leachate nanofiltration concentrated solution treatment
  • Safe and high-efficiency combined technology for landfill leachate nanofiltration concentrated solution treatment

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The leachate nanofiltration concentrate is taken from an old urban domestic waste landfill in eastern China. The leachate treatment adopts MBR biochemical system (A / O process) + external ultrafiltration (UF) + nanofiltration (NF) treatment process. The chromaticity of the nanofiltration concentrate produced by it is 4000 times, the COD is 2450 mg / L, and the BOD5 is 100 mg / L, the salinity is 14000 mg / L, the conductivity is 17690 μS / cm, and the heavy metal concentration is shown in Table 1. First, add 5 mmol / L FeCl to the flocculation stirring tank equipped with the above-mentioned nanofiltration concentrate 3 . 6H 2 O (1.35 g / L), and stirred rapidly at a stirring speed of 200 r / min for 7 min, then added 5 mg / L polyacrylamide to the reacted solution, and slowly stirred at a stirring speed of 50 r / min Stir for 20 min. After the flocculation effluent flows into the sedimentation tank to precipitate iron sludge, its supernatant removes 60% of COD, 60% of chroma and Fe 3+...

Embodiment 2

[0030] The leachate nanofiltration concentrate is taken from a municipal solid waste landfill in central China. The leachate treatment adopts the biofilm method + external ultrafiltration (UF) + nanofiltration (NF) treatment process. The nanofiltration concentrate produced by it is Chromaticity is 3500 times, COD is 3350 mg / L, BOD 5 The concentration of heavy metals is 120 mg / L, the salinity is 13800 mg / L, the conductivity is 16690 μS / cm, and the concentration of heavy metals is shown in Table 2. First, add 10 mmol / L Fe(NO 3 ) 3 . 9H 2 O (4.04 g / L), and stirred rapidly at a stirring speed of 400 r / min for 18 min, then added 10 mg / L polyacrylamide to the reacted solution, and slowly stirred at a stirring speed of 120 r / min Stir for 70 min. After the flocculation effluent flows into the sedimentation tank to precipitate iron sludge, its supernatant removes 65% of COD, 60% of chroma and Fe 3+ About 1.5 mmol / L remained. The flocculation supernatant in the supernatant tank w...

Embodiment 3

[0034] The leachate nanofiltration concentrate was taken from a domestic waste landfill in a city in southern China. The leachate was treated by a medium-temperature anaerobic system + nitrification / denitrification + external ultrafiltration (UF) + nanofiltration (NF) treatment process. The resulting nanofiltration concentrate has a chromaticity of 4500 times, a COD of 4200 mg / L, and a BOD of 5 The concentration of heavy metals is 160 mg / L, the salinity is 15000 mg / L, the conductivity is 17500 μS / cm, and the concentration of heavy metals is shown in Table 3. First, add 10.00 g / L polyferric sulfate to the flocculation stirring tank equipped with the above-mentioned nanofiltration concentrate, and stir rapidly at a stirring speed of 100 r / min for 10 min, and then add 15 mg / L to the reacted solution. L of chitosan was stirred slowly for 100 min at a stirring speed of 200 r / min. After the flocculation effluent flows into the sedimentation tank to precipitate iron sludge, its supe...

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Abstract

The invention provides a safety and high-efficiency combined technology for landfill leachate nanofiltration concentrated solution treatment. The combined technology comprises three processes of iron-based flocculent precipitation treatment, electricity-like Fenton advanced oxidation and activated carbon adsorption treatment. The iron-based flocculent precipitation treatment can achieve a flocculent appropriate pH by controlling an adding mount of ferric salt to enhance a flocculation effect; in the electricity-like Fenton advanced oxidation, residual Fe<3+> of flocculation supernatant is utilized as a catalyst precursor, and an organic matter degrading effect is obviously improved compared with ordinary electrolysis; by means of arranging the activated carbon adsorption process, residuallow-molecular-weight organic matters after the former two steps and toxic and side byproducts generated in the electricity-like Fenton process can be adsorbed at the same time in high efficiency; finally safe and high-efficiency treatment on a concentrated solution is achieved; thus, the problems that the landfill leachate nanofiltration concentrated solution is difficult to treat and effluent hashigh toxicity in the field of water pollution control are solved.

Description

technical field [0001] The patent of the invention relates to the field of water pollution control, in particular to a combined process for treating landfill leachate nanofiltration concentrate. Background technique [0002] "Standards for Pollution Control of Domestic Garbage Landfill Sites" (GB16889-2008) has made strict regulations on the discharge standards of landfill leachate. In order to meet the discharge standards, large-scale landfills across the country generally adopt the "membrane bioreactor-nanofiltration-reverse osmosis process (MBR-NF-RO process, referred to as the full-membrane process)". Reverse osmosis (NF) and reverse osmosis (RO) only play the role of physical filtration, so when the permeate reaches the standard, 20-30% membrane filtration concentrate will be produced. Among them, the nanofiltration concentrate has a high content of refractory organic matter and heavy metals, and also contains a high concentration of salt, which is difficult to process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F103/06C02F101/30C02F101/20
Inventor 陈少华楚东原陈明亮冯华良张召基
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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