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Comprehensive treatment method for garbage leachate

A landfill leachate and comprehensive treatment technology, applied in the field of environmental protection, to achieve the effect of ensuring long-term operational stability, low operating costs, and low energy consumption

Active Publication Date: 2012-08-29
天津凯铂能膜工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Through the comparison of technical features, the above four published patent documents are essentially different from this patent application. The membrane separation treatment mentioned in the above patent refers to the treatment of landfill leachate by reverse osmosis process, and there is still the problem of further treatment of reverse osmosis concentrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0062] The leachate of a garbage dump is black and slightly turbid, the water quality is COD Cr5284mgL, ammonia nitrogen 2610mgL, and the surface tension is 42mN / m. After the landfill leachate is treated by the foam separation equipment, the raw water of the leachate is added with an appropriate amount of Ca(OH)2 to adjust the pH to 11.5, and the metal ions in the leachate are flocculated and precipitated. After standing for precipitation, the supernatant is taken, and its color is light brown. After these two steps of pretreatment, the water quality of the landfill leachate is 3128mgL of CODCr, 2179mg / L of ammonia nitrogen, and the surface tension is 65mN / m.

[0063] The pretreated landfill leachate enters the stable gaseous membrane module to remove the ammonia nitrogen after micro-ultrafiltration, uses 25% dilute sulfuric acid as the absorbent, the membrane inlet ammonia nitrogen is 2179mg / L, the membrane outlet ammonia nitrogen is 70.1mgL, and the ammonia nitrogen is remov...

example 2

[0066] The leachate of a garbage dump is black and slightly turbid, the water quality is CODCr5314mg / L, ammonia nitrogen is 3159mgL, and the surface tension is 42mN / m. After the landfill leachate is treated by the foam separation equipment, the raw water of the leachate is added with an appropriate amount of Ca(OH)2 to adjust the pH to 11.0, and the metal ions in the leachate are flocculated and precipitated. After standing for precipitation, the supernatant is taken, and its color is light brown. After pretreatment, the water quality is CODCr3042mg / L, ammonia nitrogen is 2569mgL, and the surface tension is 63mN / m.

[0067] The pretreated landfill leachate enters the stable gaseous membrane module to remove the ammonia nitrogen after micro-ultrafiltration, uses 25% dilute sulfuric acid as the absorbent, the membrane inlet ammonia nitrogen is 2569mg / L, the membrane outlet ammonia nitrogen is 35.43mg / L, and the ammonia nitrogen The removal rate is 98.62%. The by-product is 15-...

example 3

[0070] The leachate of a garbage dump is black and slightly turbid, the water quality is 5358mg / L CODCr, 3156mg / L ammonia nitrogen, and the surface tension is 40mN / m. After the landfill leachate is treated by foam separation equipment, the raw water of the landfill leachate is electrolytically flocculated for 60 minutes by electrocoagulation method, and its color is light brown, and the pH value of the landfill leachate is increased to between 12-13. The water quality of landfill leachate after pretreatment is CODCr 2988mg / L, ammonia nitrogen 2689mg / L, and surface tension 67mN / m.

[0071] After micro-ultrafiltration, the landfill leachate enters the stable gaseous membrane module to remove ammonia nitrogen. Using 25% dilute sulfuric acid as the absorbent, the membrane inlet ammonia nitrogen is 2689mg / L, the membrane outlet ammonia nitrogen is 46.98mg / L, and the ammonia nitrogen removal rate is 98.25% %. The by-product is 15-30% ammonium sulfate, which can be used as fertilize...

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Abstract

The invention relates to a comprehensive treatment method for garbage leachate. The comprehensive treatment method for the garbage leachate comprises the following steps: (1) performing foam separation pretreatment; (2) performing coagulation sedimentation pretreatment; (3) performing microfiltration and ultrafiltration treatment; (4) performing gaseous film separation treatment; and (5) performing biochemical treatment. The garbage leachate is subjected to coagulation sedimentation and foam separation pretreatment, so that most of metal ions, floating oil, surfactants and part of organic matters are removed from the garbage leachate and the chemical oxygen demand (COD) and the chromaticity of the garbage leachate are reduced; suspended matters, macromolecular matters and the like are removed from the leachate through the microfiltration and ultrafiltration after pretreatment, so the liquid is clear, the gaseous film is difficult to block and pollute, and long-term operating stabilityof the gaseous film in the subsequence process is guaranteed; and ammonia nitrogen is efficiently removed from the leachate in the gaseous film stabilizing process and the ammonia nitrogen removal rate can be adjusted as required, so that the waste water has the best nitrogen carbon ratio and the successful operation of the subsequence biochemical system is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and relates to landfill leachate, in particular to a comprehensive treatment method for landfill leachate. Background technique [0002] Landfill leachate is produced during the process of landfill and stacking, when the liquid produced by the decomposition of organic matter in the garbage is soaked by external moisture (including atmospheric precipitation, surface water, and groundwater). Landfill leachate is a high-concentration wastewater with complex components, containing a large amount of organic matter, plant nutrients (mainly nitrogen-containing), inorganic ions, and heavy metal ions. It has deep color, high organic content, high ammonia nitrogen content, and water quality complex, and water quality changes with the age of the field. The water quality of landfill leachate can usually be divided into two categories according to the "age" of the landfill: one is the leachat...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/463C02F1/44C02F1/20C02F1/24C02F1/66
Inventor 秦英杰刘立强崔东胜蔡腾豪李海庆
Owner 天津凯铂能膜工程技术有限公司
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