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Device and method for deeply denitrifying landfill leachate through electrochemical coupling sulfur autotrophic denitrification system

A technology for landfill leachate and deep denitrification, which is applied in the field of landfill leachate deep denitrification device of electrochemically coupled sulfur autotrophic denitrification system, can solve the problem of affecting the denitrification efficiency of sulfur oxidizing bacteria, and the denitrification efficiency is difficult to be guaranteed and reduced. The pH of the reaction environment and other problems can achieve the effect of low sludge production, enhanced activity and enhanced effect.

Pending Publication Date: 2021-11-30
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the sulfur autotrophic denitrification process will produce a large amount of H + , thereby reducing the pH of the reaction environment, which in turn affects the denitrification efficiency of sulfur oxidizing bacteria, resulting in the need to supplement alkalinity in practical applications, which not only increases the treatment cost, but also makes it difficult to guarantee the denitrification efficiency

Method used

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  • Device and method for deeply denitrifying landfill leachate through electrochemical coupling sulfur autotrophic denitrification system
  • Device and method for deeply denitrifying landfill leachate through electrochemical coupling sulfur autotrophic denitrification system
  • Device and method for deeply denitrifying landfill leachate through electrochemical coupling sulfur autotrophic denitrification system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1 A deep denitrification device for landfill leachate in an electrochemically coupled sulfur autotrophic denitrification system

[0048] like figure 1 As shown, the landfill leachate deep denitrification device adopts an upflow design, including a reactor main body, a water inlet system, a reaction system, an outlet water system and a circulation system. The material of the reactor main body is plexiglass, and the reactor The main body of the device is arranged into two parts, the reaction chamber 1 and the overflow area 2 from the vertical direction, the top of the reaction chamber 1 is provided with an overflow weir 11, and the inner upper wall of the reaction chamber 1 is provided with a support plate 12;

[0049] Described water inlet system comprises water inlet 31, water inlet tank 32, water inlet pump 33 and water inlet pipe, and described water inlet 31 is arranged on the bottom of reaction chamber 1, and described water inlet 31 place is provided with w...

Embodiment 2

[0054] Example 2 Establishment of deep denitrification method for landfill leachate in electrochemically coupled sulfur autotrophic denitrification system

[0055] On the basis of the deep denitrification device for landfill leachate in an electrochemically coupled sulfur autotrophic denitrification system in Example 1, a method for deep denitrification of landfill leachate in an electrochemically coupled sulfur autotrophic denitrification system is established. Specifically include the following steps:

[0056] (1) Microbial inoculation

[0057] To the electrochemically coupled sulfur autotrophic denitrification system landfill leachate deep denitrification device of embodiment 1, add the mud-water mixture of the sulfur autotrophic denitrification activated sludge whose initial sludge concentration is 6g MLSS / L, and the mud-water mixture passes through The water inlet pool 32 enters the reaction chamber 1, and then flows to the water outlet pool 23 through the overflow area ...

Embodiment 3

[0063] Example 3 Effect of Current Intensity on Application Effect of Electrochemical Coupled Sulfur Autotrophic Denitrification System Landfill Leachate Deep Denitrification Method

[0064] The deep denitrification method of landfill leachate in the electrochemically coupled sulfur autotrophic denitrification system established in Example 2 performs deep denitrification of landfill leachate at different current intensities, and explores the effect of different current intensities on reactor denitrification by adjusting the current intensity Influenced by the effect, set the current gradient to 20, 40, 60, 80, 100mA, and the reactor feed water is the landfill leachate effluent treated by the short-range nitrification + anammox secondary coupling process. The detailed water quality is shown in Table 1. Other operating conditions are set as follows: influent pH is 7.5-8.5, HRT (hydraulic retention time) is 12h, internal circulation is 4Q, reactor influent NO 3 - -N concentratio...

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Abstract

The invention belongs to the technical field of biological sewage treatment, and particularly relates to a device and method for deeply denitrifying landfill leachate through an electrochemical coupling sulfur autotrophic denitrification system, the electrochemical coupling sulfur autotrophic denitrification system is adopted, the process operation is simple, the operation is convenient, and the stability is high; the device and method are used for deeply denitrifying the landfill leachate, an external carbon source is not needed, the sludge yield is low, the denitrification efficiency is high, and a subsequent residual sludge treatment process is not needed; in the sulfur autotrophic denitrification process, as elemental sulfur is adopted as an electron donor, the pH does not need to be adjusted, and the denitrification activity of microorganisms is well guaranteed; in the operation process, a large number of functional microorganisms can be enriched on the surfaces of the sulfur particles, the carbon particles and the electrode plates, so that sulfur autotrophic denitrification on the surfaces of the sulfur particles can be coupled with hydrogen autotrophic denitrification performed on the microorganisms on the surfaces of the cathode plates and the carbon particles, and the denitrification effect is further enhanced; the deep denitrification of the low-carbon-nitrogen-ratio landfill leachate is realized.

Description

technical field [0001] The invention belongs to the technical field of sewage biological treatment, and in particular relates to a deep denitrification device and method for landfill leachate in an electrochemically coupled sulfur autotrophic denitrification system. Background technique [0002] With the continuous acceleration of urbanization and development, the output of municipal solid waste is huge. At present, most urban wastes are mainly disposed of by sanitary landfills, but a large amount of landfill leachate is unavoidably produced during the sanitary landfilling process and after the landfill pits are closed. Landfill leachate is a kind of high-concentration nitrogen-containing organic wastewater with complex components. Due to its characteristics of high ammonia nitrogen content, high biological toxicity, low C / N, high content of heavy metals and inorganic salts, its biological treatment is difficult. Therefore, how to efficiently Disposal of landfill leachate i...

Claims

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Application Information

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IPC IPC(8): C02F3/00C02F3/28C02F103/06C02F101/16
CPCC02F3/005C02F3/28C02F2103/06C02F2101/16
Inventor 吕慧王晓梁慧宇孙连鹏贾妍艳邓欢忠
Owner SUN YAT SEN UNIV
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