Leachate treatment method and leachate treatment system

A treatment method and a treatment system technology, applied in the field of liquid purification, can solve problems such as the difficulty of achieving full treatment and zero discharge, and achieve the effects of avoiding organic matter problems, stable operation, and improved operation stability

Pending Publication Date: 2021-12-17
EVERBRIGHT ENVIRONMENTAL TECH RES INST NANJING CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a leachate treatment method and a leachate treatment system to at least solve the problem in the related art that it is difficult to achieve full treatment and zero discharge

Method used

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  • Leachate treatment method and leachate treatment system

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Effect test

Embodiment 1

[0066] The process of the present invention is used to treat the leachate of a waste incineration plant. The water quality is as follows: COD is 30000~50000 mg / L, TDS is 10000~12000 mg / L, NH 3 -N is 1000~2000 mg / L.

[0067] The anaerobic unit adopts the form of UASB, and the COD of the effluent after the leachate is treated by the anaerobic unit is 5000~7000 mg / L. The biogas generated by the anaerobic unit is purified and then sent to the biogas boiler to generate hot water at 90 °C. The evaporation unit is used as a heat source for the evaporation unit; the anaerobic effluent enters the biochemical unit, and the biochemical unit adopts the A / O form. The molecular weight cut-off of the ultrafiltration membrane is 1000 Da. After being treated by the biochemical unit and filtered by the ultrafiltration membrane, the COD of the ultrafiltration effluent is 500 mg / L, NH 3 -N is 10~30 mg / L; ultrafiltration effluent is sent to the first advanced oxidation treatment unit, the first a...

Embodiment 2

[0073] The process of the present invention is used to treat the leachate of a waste incineration plant. The water quality is as follows: COD is 30000~50000 mg / L, TDS is 10000~12000 mg / L, NH 3 -N is 1000~2000 mg / L.

[0074] The anaerobic unit adopts the IC form, and the COD of the effluent after the leachate is treated by the anaerobic unit is 4000~6000 mg / L. The biogas generated by the anaerobic unit is purified and then sent to the biogas boiler to generate hot water at 75°C. The evaporation unit is used as a heat source for the evaporation unit; the anaerobic effluent enters the biochemical unit, and the biochemical unit adopts a short-range nitrification and denitrification process. The molecular weight cut-off of the ultrafiltration membrane is 20,000 Da. 800 mg / L, NH 3 -N is 20~30 mg / L; ultrafiltration effluent is sent to the first advanced oxidation treatment unit, the first advanced oxidation treatment unit adopts ozone / hydrogen peroxide oxidation device, H 2 o 2 wi...

Embodiment 3

[0077] The process of the present invention is used to treat the leachate of a waste incineration plant. The water quality is as follows: COD is 30000~50000 mg / L, TDS is 10000~12000 mg / L, NH 3 -N is 1000~2000 mg / L.

[0078] The anaerobic unit adopts the form of IOC, and the COD of the effluent after the leachate is treated by the anaerobic unit is 3000~5000 mg / L. The biogas generated by the anaerobic unit is purified and then sent to the biogas boiler to generate hot water at 50 °C. The evaporation unit is used as a heat source for the evaporation unit; the anaerobic effluent enters the biochemical unit, and the biochemical unit adopts anaerobic ammonium oxidation. The molecular weight cut-off of the ultrafiltration membrane is 50,000 Da. 1000 mg / L, NH 3 -N is 20~40 mg / L; the ultrafiltration effluent is sent to the first advanced oxidation treatment unit, the first advanced oxidation treatment unit adopts an electron beam device, the irradiation dose rate is 10~20kGy, and the...

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Abstract

The invention provides a leachate treatment method and system.The leachate treatment method comprises the following steps: 1, performing a biodegradation reaction on penetrating fluid through anaerobic microorganisms, and removing a part of organic matter in the penetrating fluid; 2, carrying out biological denitrification on the penetrating fluid through the anaerobic microorganism bacteria to remove part of nitrogen in the penetrating fluid; 3, filtering the penetrating fluid; 4, further degrading organic matters in the penetrating fluid through first advanced oxidation treatment; 5, treating the penetrating fluid through electrodialysis reversal to obtain first fresh water and first concentrated water; 6, evaporating and crystallizing the first concentrated water to obtain inorganic salt; 7, filtering the first fresh water to obtain second fresh water and second concentrated water, and discharging the second fresh water as produced water; 8, further degrading organic matters in the second concentrated water through second advanced oxidation treatment; and step 9, repeating the step 3 to the step 8 on the second concentrated water treated in the step 8. According to the invention, the whole amount of the penetrating fluid can be treated, and zero emission is realized.

Description

technical field [0001] The invention relates to the field of liquid purification, in particular to a leachate treatment method and a leachate treatment system. Background technique [0002] In recent years, with the acceleration of my country's urbanization process, people's living standards have been steadily improved, and the amount of garbage generated has increased year by year, followed by the construction of a large number of waste incineration plants. The waste collected by waste-to-energy plants needs to be fermented in garbage pits for 5-7 days. During the fermentation process, the water in the garbage will seep out to form landfill leachate. Landfill leachate is a liquid with high concentration, high ammonia nitrogen, and high pollution, which will have a very large impact on the environment. [0003] The existing leachate treatment technology of waste incineration plants generally adopts the process of "pretreatment + anaerobic + aerobic + advanced treatment system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/16C02F101/30C02F103/06
CPCC02F9/00C02F3/2846C02F3/2873C02F3/28C02F3/302C02F1/001C02F1/722C02F1/725C02F1/78C02F1/4693C02F1/048C02F1/444C02F1/442C02F2101/16C02F2101/30C02F2103/06
Inventor 陆飞鹏安瑾韩晶鑫程本贵郭若军李向东朱亚茹陈方方苏雅
Owner EVERBRIGHT ENVIRONMENTAL TECH RES INST NANJING CO LTD
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