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Integrated processing technology of landfill leachate

A landfill leachate and treatment process technology, which is applied in the field of landfill leachate integrated treatment process, can solve problems such as high salt content and complex components of DTRO concentrate, and achieve the effect of zero discharge

Inactive Publication Date: 2019-10-11
烟台金正环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition of DTRO concentrate is complex, with high COD and salt content, the treatment and discharge of DTRO concentrate has become a key problem to be solved urgently

Method used

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  • Integrated processing technology of landfill leachate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A domestic waste leachate, the main quality index PH=7.78, conductivity 18,000 μS / cm, CODcr: 6800 mg / L. The process is as follows:

[0022] Add acid to adjust the pH of the landfill leachate stock solution, and enter the quartz sand filter with a filtration accuracy of 50 um. The sand filtered water is added with scale inhibitor and then enters the security filter with a filtration accuracy of 10 um. The effluent enters the first-stage DTRO for filtration and concentration, and the concentration factor is about 5 times. The concentrated solution enters the electrolytic catalytic oxidation equipment for electrolysis, and the COD removal rate is 75%. The effluent from electrolytic catalytic oxidation enters 12 MPa HP-DTRO for filtration and concentration, with a removal rate of 99% and a recovery rate of about 40%. The high-concentration concentrated liquid is recompressed by mechanical steam to evaporate 80% of the water, and then dried to obtain miscellaneous salts. ...

Embodiment 2

[0024] For the leachate of a landfill, the water quality indicators are: PH=8.24, conductivity 42,000 μS / cm, CODcr: 5360mg / L. The process is as follows:

[0025] Add acid to adjust the pH of the landfill leachate stock solution, and enter the sand filter and security filter for treatment. The filtration accuracy of the sand filter is 100 um. The sand filtered water is added with scale inhibitor and then enters the security filter with a filtration accuracy of 10 um. The effluent enters the first-stage DTRO for filtration and concentration, and the concentration factor is about 4 times. The concentrated liquid enters the three-dimensional electrolytic catalytic oxidation equipment equipped with detrital activated carbon filler for electrolysis, and the COD removal rate is 82%. The effluent from electrolytic catalytic oxidation enters 12 MPa HP-DTRO for filtration and concentration, with a removal rate of 99.9%. The high-concentration concentrated solution is recompressed by m...

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Abstract

The invention relates to an integrated processing technology of landfill leachate. The technology includes the following steps of firstly, preprocessing the landfill leachate; secondly, making preprocessed output water enter a first-stage DTRO for filtering concentration; thirdly, conducting oxidation treatment on a first-stage DTRO concentrated solution; fourthly, making oxidized output water enter an HP-DTRO for further concentration; fifthly, evaporating a concentrated solution through mechanical vapor recompression (MVR), then conducting drying to obtain carnallite, and conducting hot-method salt separating treatment on the carnallite; sixthly, making first-stage DTRO produced water and HP-DTRO produced water enter a second-stage DTRO to be processed, and making concentrated water produced by the second-stage DTRO flow back to the first-stage DTRO to continues to be filtered. The DTRO concentrated solution deep processing technology which integrates the high-grade oxidation technology and the high-pressure disc tube type reverse osmosis (HP-DTRO) solves the key problem of DTRO concentrated solution treatment and resourceful utilization, and the zero-emission of the landfill leachate is realized.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to an integrated treatment process for landfill leachate. Background technique [0002] Landfill leachate is high-concentration organic wastewater produced in landfills. It has complex components, large changes in water quality and quantity, and contains more organic substances that are difficult to biodegrade, such as organic heterocycles (heterocycles, polycyclic aromatic hydrocarbons), acid esters, etc. Classes, amides, etc., account for more than 70% of the total organic components of landfill leachate, which are difficult to treat by conventional biological methods, and require high conditions for operation. [0003] Reverse osmosis is one of the commonly used water treatment processes and is often used for advanced treatment of wastewater. Disc type reverse osmosis (DTRO) adopts an open flow channel design, which has excellent anti-pollution performance, can operate stably...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F9/06C02F9/04C02F101/30C02F103/06
CPCC02F9/00C02F1/001C02F1/66C02F1/441C02F1/4672C02F1/041C02F1/722C02F1/725C02F1/78C02F2101/30C02F2103/06C02F2301/08
Inventor 李越彪姜华林会杰李国亮万昌银李志伟张卓
Owner 烟台金正环保科技有限公司
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