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Comprehensive treatment system and process for landfill leachate

A technology for comprehensive treatment of landfill leachate, applied in the field of landfill leachate treatment, can solve the problems of poor biodegradability, affect the treatment effect, difficult to recycle, etc. The effect of use, good environment and economic benefits

Pending Publication Date: 2021-10-08
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the low content of methane in landfill gas, the output varies greatly with seasons and landfill time, and it is difficult to recycle. Usually, it is collected and burned, resulting in a waste of resources.
[0005] The bottleneck of the current landfill leachate treatment is mainly that it contains a large amount of toxic and harmful refractory organic matter, and its biodegradability is poor. The traditional nitrification and denitrification biological denitrification often requires an external carbon source, the treatment cost is high, and the high concentration of ammonia nitrogen is limited. The treatment process affects the treatment effect

Method used

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  • Comprehensive treatment system and process for landfill leachate

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Effect test

Embodiment 1

[0035] A comprehensive landfill leachate treatment system, specifically: along the direction of landfill leachate flow, 1 grid and screen, 4 acidification tanks, 6 fluidized bed Fenton oxidation towers, 9 sedimentation tanks, and 11AO nitrosation reaction tanks are arranged in sequence , 13 DAMO reactors and 15 constructed wetlands, wherein, in order to adjust the pH in the acidification tank, 2 sulfuric acid storage tanks are also provided to connect with the acidification tank, and at the same time, 3 stirrers are also provided in the acidification tank to realize the uniform acidification treatment process. In order to add Fenton reagent to the fluidized bed Fenton oxidation tower, 5 Fenton reagent storage tanks are arranged on the pipelines of the acidification tank and the fluidized bed Fenton oxidation tower. In order to adjust the pH in the sedimentation tank, 7 sodium hydroxide storage tanks and 8 polyacrylamide flocculant storage tanks are also installed on the pipelin...

Embodiment 2

[0038] Based on the landfill leachate comprehensive treatment system in Example 1, landfill leachate is used, with a COD concentration of 1100±50 mg / L, a BOD concentration of 300±30 mg / L, and an ammonia nitrogen concentration of 800±50 mg / L.

[0039] After Fenton oxidation and AO nitrosation, the concentration of ammonia nitrogen in the leachate dropped below 10mg / L, the concentration of nitrite nitrogen in the effluent was 500±20mg / L, and the concentration of nitrate nitrogen was 50±5mg / L, successfully achieving nitrosation. It can be seen that the biochemical effect of landfill leachate after Fenton oxidation is better, and the removal or conversion rate of ammonia nitrogen reaches 98±1%.

[0040] In the anaerobic membrane bioreactor, the landfill leachate after nitrosation reaction and diluted 5 times was added, and the denitrification experiment was carried out. The leachate contained 100±20mg / L nitrite nitrogen and 10±1mg / L nitrate nitrogen. Reaction 5 Days later, the eff...

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Abstract

The invention belongs to the technical field of landfill leachate treatment, and particularly relates to a comprehensive treatment system and process for landfill leachate. The comprehensive treatment system for landfill leachate comprises an acidification pool, a fluidized-bed Fenton oxidation tower, an AO nitrosation reaction pool, a DAMO reactor and an artificial wetland which are sequentially arranged along the flowing direction of landfill leachate. According to the invention, Fenton advanced oxidation technology is adopted to improve the carbon nitrogen ratio and biodegradability of the landfill leachate, and AO nitrosation reaction and anaerobic methane oxidation (DAMO) reaction are combined, so pollutants in the landfill leachate are removed, recycling of landfill gas is achieved, and the use of an external carbon source is reduced; and after biological denitrification, further desalination and deep purification are conducted on the landfill leachate by adopting the capacitive deionization (CDI)-based composite constructed wetland.

Description

technical field [0001] The disclosure belongs to the technical field of landfill leachate treatment, and in particular relates to a landfill leachate comprehensive treatment system and process. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Landfill leachate is a kind of high-concentration organic wastewater produced after the landfill, the moisture and rainwater of the garbage itself pass through the landfill layer through various biochemical reactions. Landfill leachate contains a variety of toxic and harmful substances, including a large number of refractory "three-caused" organic substances, and the concentration of ammonia nitrogen is as high as 1000-4000mg / L; moreo...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/06
CPCC02F9/00C02F2305/026C02F2103/06C02F2001/007C02F1/5281C02F1/52C02F1/66C02F1/725C02F1/722C02F3/30C02F3/302C02F3/32C02F3/2853C02F1/001Y02E50/30
Inventor 胡振张雪张建吴世博谢慧君梁爽
Owner SHANDONG UNIV
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