Zero-emission treatment system and method for leachate of waste incineration plant

A waste incineration and treatment system technology, applied in filtration treatment, contaminated groundwater/leachate treatment, sedimentation treatment, etc., can solve problems such as difficult cleaning and replacement, raw material hardening, evaporation and condensed water pollutants, etc., to achieve recycling and resource utilization, reduce processing energy consumption and cost, and improve the effect of advanced processing efficiency

Pending Publication Date: 2020-10-30
中节能工程技术研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: 1. The leachate directly enters the nanofiltration unit without pretreatment, and the organic matter and suspended matter in the water are likely to cause membrane fouling and frequent membrane cleaning / replacement, which affects the stable operation of the overall process; 2. The membrane deamination unit The resulting ammonium sulphate solution is less concentrated and requires further concentration, which incurs additional energy consumption
And the deamination process needs to add a large amount of alkali to adjust the pH, resulting in a significant increase in treatment costs
3. After the concentrated water enters the evaporation system, the high-concentration organic matter in it is easy to form azeotrope, so that the evaporative condensed water contains a large amount of organic pollutants
This method also faces the problem that the concentration of the ammonium salt solution produced by the membrane deamination unit cannot meet the industrial use standard, and it does not realize the resource utilization of ammonia in a real sense.
At the same time, the iron and carbon raw materials are used separately in the iron-carbon micro-electrolysis unit, which is easy to cause hardening of the raw materials, which is difficult to clean and replace, and will also significantly reduce the treatment effect

Method used

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  • Zero-emission treatment system and method for leachate of waste incineration plant

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The basic water quality of the leachate of a waste incineration plant in Hebei is as follows: pH is 6.7-6.8; COD concentration is 58000-77000mg / L; ammonia nitrogen concentration is 680-800mg / L; total nitrogen concentration is about 1100-1240mg / L. Utilize leachate treatment system of the present invention to carry out leachate treatment, concrete method step is as follows:

[0053] 1. The leachate enters the regulating tank to adjust the water volume and quality;

[0054] 2. The effluent from the adjustment tank enters the hydrolysis and acidification tank. After hydrolysis and acidification, the pH of the water drops to 5.3, and the pH value is adjusted to 6.8-7.2 with sodium carbonate to meet the conditions for methanation in the UASB anaerobic reaction tank;

[0055] 3. The effluent from the hydrolytic acidification tank enters the UASB anaerobic reaction tank to remove most of the organic matter in the water. The effluent pH is 7.8-8.0, the COD concentration is 8300...

Embodiment 2

[0067] The basic water quality of the leachate of a waste incineration plant in Jiangsu is as follows: pH is 6.4-6.8; COD concentration is 45000-65000mg / L; ammonia nitrogen concentration is 520-690mg / L; total nitrogen concentration is about 820-1080mg / L.

[0068] Adopt the method for embodiment 1 to process this leachate, difference is:

[0069] Adjust the pH of the effluent from the pool to 5.3, and use sodium carbonate to adjust the pH to 6.9-7.0;

[0070] The air-water ratio of the air flotation tank is controlled at 20:1, and the ascending flow rate is controlled at 2.8m / h;

[0071] The struvite reaction tank adjusts the pH of the water to 9.0, uses magnesium chloride as the magnesium source, and sodium dihydrogen phosphate as the phosphorus source, and adjusts the molar ratio of Mg:N:P in the water to 1.1:1:1;

[0072] In the A / O system, the sludge concentration is 4.5g / L, the dissolved oxygen in the anoxic zone is controlled at 0.35-0.4mg / L, and the dissolved oxygen in ...

Embodiment 3

[0078] The basic water quality of the leachate of a waste incineration plant in Anhui is as follows: pH is 6.5-6.7; COD concentration is 60000-75000mg / L; ammonia nitrogen concentration is 800-920mg / L; total nitrogen concentration is about 1100-1200mg / L.

[0079] Adopt the method for embodiment 1 to process this leachate, difference is:

[0080] Adjust the pH of the effluent from the pool to 5.4, and use sodium carbonate to adjust the pH to 6.8-7.0;

[0081] The air-water ratio of the air flotation tank is controlled at 22:1, and the ascending flow rate is controlled at 3m / h;

[0082] The struvite reaction tank adjusts the pH of the water to 9.0, uses magnesium chloride as the magnesium source, and sodium dihydrogen phosphate as the phosphorus source, and adjusts the molar ratio of Mg:N:P in the water to 1.2:1:1;

[0083] In the A / O system, the sludge concentration is 4.9g / L, the dissolved oxygen in the anoxic zone is controlled at 0.3-0.4mg / L, and the dissolved oxygen in the ...

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Abstract

The invention relates to the technical field of sewage treatment, in particular to a zero-discharge treatment system and method for leachate of a waste incineration plant. The treatment system comprises an adjusting tank, a hydrolysis acidification tank, a UASB anaerobic reaction tank, an air floatation tank, a struvite reaction tank, a sedimentation tank, an A / O reaction tank, an MBR membrane tank, electron beam irradiation equipment, a coagulation tank, a security filter and negative pressure membrane distillation equipment which are sequentially connected in the water flow direction. According to the zero-emission treatment system for the leachate of the waste incineration plant, the water quality of the leachate generated by the waste incineration plant after treatment can reach the emission limit value standard of the Control Standard of Domestic Refuse Landfill (GB 16889-2008), compared with the prior art, the method has the advantages of good treatment effect, low cost and stability in operation, zero emission of the landfill leachate can be realized after treatment, and accordingly the method has good application and popularization prospect and can protect stable production, cost reduction and efficiency increase of a waste incineration plant.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a zero-discharge treatment system and method for leachate of a waste incineration plant. Background technique [0002] Waste incineration power generation technology is gradually replacing sanitary landfill as the mainstream technology for urban domestic waste treatment in my country due to its small footprint, high degree of mechanization, and significant advantages such as reduction, harmlessness, and resourceful treatment of waste. . However, due to the high moisture content of domestic waste in my country, in order to increase the combustion calorific value of waste, it is necessary to ferment the waste before incineration to make it mature and drain the water, and a large amount of landfill leachate will be produced in this process. Landfill leachate is a kind of organic polluted wastewater with complex water quality, high concentration of pollutants, and difficult ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C01B25/45C05B7/00C02F101/30C02F103/06
CPCC02F9/00C01B25/451C05B7/00C02F1/305C02F1/001C02F1/447C02F1/66C02F3/2846C02F3/302C02F1/24C02F1/5254C02F2001/007C02F1/56C02F1/5236C02F2209/08C02F2209/14C02F2209/16C02F2209/06C02F2101/30C02F1/72C02F1/725C02F2103/06C02F2305/023
Inventor 郭智刘健平刘风华张欣任荣杰王增辉
Owner 中节能工程技术研究院有限公司
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