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Method for treating aged landfill leachate by continuous flow fixed bed autotrophic nitrogen removal

A technology for landfill leachate and autotrophic denitrification, applied in sustainable biological treatment, chemical instruments and methods, water/sludge/sewage treatment, etc. Deal with leachate and other problems to achieve the effect of saving carbon sources, reducing operating costs and good application prospects

Pending Publication Date: 2022-08-05
BEIJING UNIVERSITY OF CIVIL ENGINEERING AND ARCHITECTURE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the water quality characteristics of old landfill leachate, such as complex components, high concentrations of organic matter and ammonia nitrogen, and imbalanced ratio of microbial nutrient elements, it is often impossible to treat leachate economically and efficiently with a single treatment technology.
The use of traditional fully mixed flocculent activated sludge to treat old landfill leachate has disadvantages such as sludge loss, toxic substances in the leachate directly inhibit anaerobic ammonia oxidizing bacteria, and low system fault tolerance.

Method used

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  • Method for treating aged landfill leachate by continuous flow fixed bed autotrophic nitrogen removal
  • Method for treating aged landfill leachate by continuous flow fixed bed autotrophic nitrogen removal

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specific Embodiment approach 1

[0034] Embodiment 1: Combining figure 1 and figure 2 This embodiment will be described. The method of the continuous flow fixed bed autotrophic denitrification treatment of aged landfill leachate in this embodiment is described. The devices used in the method include a water inlet tank 1, a peristaltic pump 2, a reaction chamber 23, a secondary sedimentation tank 7, and a return pipe. 10. Connecting pipe 19, air pump 12, aeration pipe 13, water outlet pipe 8 and water inlet pipe 3;

[0035] The water inlet tank 1 and the peristaltic pump 2, the peristaltic pump 2 and the reaction chamber 23 are communicated with the water inlet pipe 3;

[0036] The reaction chamber 23 and the secondary sedimentation tank 7 are communicated with the connecting pipe 19;

[0037] The outlet pipe 8 is connected with the secondary settling tank 7; a return pump 16 is provided between the secondary settling tank 7 and the water inlet pipe 3, and the secondary settling tank 7 and the return pump 1...

specific Embodiment approach 2

[0057] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the lateral flow autotrophic denitrification biofilm sludge is stored at a low temperature of 4°C. Others are the same as the first embodiment.

Embodiment 1

[0059] The old landfill leachate is passed into the continuous flow fixed bed autotrophic denitrification system of the specific embodiment one that has completed the adaptation stage of the continuous flow fixed bed autotrophic denitrification system (step 2), and the hydraulic retention time in the control reaction chamber 23 is 48h, the reaction chamber 23A is not aerated, the reaction chamber 23B, C and D are aerated, and the aeration flow rates are 150mL / min, 150mL / min, and 150mL / min respectively; the reflux flow is equal to Influent flow; that is, to realize the treatment of old landfill leachate.

[0060] In this embodiment, the water bath incubator 22 is used to control the operating temperature of the reaction chamber 23 within the range of 28±2°C.

[0061] The water quality components of the actual waste old landfill leachate are shown in Table 1:

[0062] Table 1

[0063] index concentration index concentration pH 8 Cr 7.6*10 -2

SS ...

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Abstract

The invention discloses a method for treating aged landfill leachate through autotrophic nitrogen removal of a continuous flow fixed bed, and relates to a method for treating the aged landfill leachate. The method comprises the following steps: 1, establishing a continuous flow fixed bed autotrophic nitrogen removal system; 2, an adaptive stage of the continuous flow fixed bed autotrophic nitrogen removal system; and 3, treating the aged landfill leachate. According to the method disclosed by the invention, the PN / A autotrophic nitrogen removal sludge is adopted based on a large amount of ammonia oxidizing bacteria and anaerobic ammonium oxidizing bacteria in the PN / A autotrophic nitrogen removal sludge through an activity recovery strategy of controlling intermittent aeration and aeration quantity and gradually increasing the ammonia nitrogen concentration of inlet water and the concentration of landfill leachate and the like; the purpose of the landfill leachate single-stage continuous flow autotrophic nitrogen removal system is economically and effectively achieved.

Description

technical field [0001] The invention relates to a method for treating aged landfill leachate. Background technique [0002] According to data from the National Bureau of Statistics, the current per capita daily garbage output in my country is 1.0 to 1.2 kilograms. The per capita annual output of Chinese cities is 400 kilograms, and the annual domestic garbage production is more than 400 million tons, ranking first in the world. The types of municipal solid waste vary greatly with living habits and the economic level of various regions. Sanitary landfill is the main method of garbage disposal in my country at present. Research shows that under the condition that the average moisture content of garbage is about 50 (the highest moisture content) and the degradable components are 30-35%, every ton of landfill garbage will produce 0.05-0. 0.2 tons of landfill leachate. Landfill leachate is a kind of high-concentration organic wastewater with complex composition, which mainly com...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F101/30C02F101/16C02F103/06
CPCC02F3/301C02F2101/30C02F2101/16C02F2103/06Y02W10/10
Inventor 高大文程朗杨文博
Owner BEIJING UNIVERSITY OF CIVIL ENGINEERING AND ARCHITECTURE
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