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Landfill leachate pretreatment method and system

A landfill leachate and pretreatment technology, which is applied in the direction of contaminated groundwater/leachate treatment, sedimentation treatment, water/sewage treatment, etc., can solve the problems of nutrient ratio imbalance and high ammonia nitrogen concentration, and reduce treatment costs and ammonia nitrogen content. The effect of high, high concentration of organic matter

Pending Publication Date: 2021-12-07
GUANGDONG YEANOVO ENVIRONMENTAL PROTECTION CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a pretreatment method and system for landfill leachate, aiming to solve the problems of high ammonia nitrogen concentration and unbalanced nutrient ratio in landfill leachate

Method used

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  • Landfill leachate pretreatment method and system
  • Landfill leachate pretreatment method and system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The landfill leachate pretreatment system of the present embodiment is as figure 1 As shown, according to the running direction of water flow, it includes: adjustment tank (1), first pH adjustment tank (2), first coagulation reaction tank (3), first flocculation reaction tank (4), first inclined tube sedimentation tank (5), the second pH adjustment tank (6), deamination reaction tank (7), the second coagulation reaction tank (8), the second flocculation reaction tank (9), the second inclined tube sedimentation tank (10), The third pH adjustment tank (11), iron-carbon fixed bed (12, 13), the third flocculation reaction tank (14), the third inclined tube sedimentation tank (15);

[0040] The regulating tank (1) can be used to store the raw water of landfill leachate;

[0041] The internal structures of the iron-carbon fixed bed (12) and the iron-carbon fixed bed (13) are identical, and the specific structures are as follows: figure 2 As shown, the iron-carbon fixed bed...

Embodiment 2

[0043] Based on the landfill leachate pretreatment system in Example 1, the landfill leachate raw water with a COD content of 6000-8000 mg / L and an ammonia nitrogen content of 2500-3000 mg / L is treated.

[0044] The landfill leachate pretreatment method of the present embodiment comprises the following steps:

[0045] The first step, according to the running direction of the water flow, the raw water of the landfill leachate passes through the adjustment tank (1), the first pH adjustment tank (2), the first coagulation reaction tank (3), the first flocculation reaction tank (4), The first inclined tube sedimentation tank (5), in this process, the pH value of the first pH adjustment tank (2) is adjusted to 7.5-8.5, in the first coagulation reaction tank (3), add coagulant sulfurous acid Iron, the addition of ferrous sulfate is 500mg / L, in the first flocculation reaction tank (4), add flocculant polyacrylamide, the addition of polyacrylamide is 5g / L, through the first inclined t...

Embodiment 3

[0049] On the basis of embodiment 2, further carry out the following operations:

[0050] The third step, the second stage supernatant passes through the third pH adjustment tank (11), iron-carbon fixed bed (12, 13), the third flocculation reaction tank (14), the third inclined tube sedimentation tank (15) successively, In this process, the pH value of the third pH adjustment tank (11) is adjusted to 2.5-3.5, and the flocculant polyacrylamide is added in the third flocculation reaction tank (14), and the addition amount of polyacrylamide is 3-5mg / L, obtain the third stage supernatant after precipitation and separation in the third inclined tube sedimentation tank (15).

[0051] After testing, the COD content in the third-stage supernatant is 3000-4000mg / L, and the removal rate is about 50%.

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Abstract

The invention provides a landfill leachate pretreatment method and system, and relates to the technical field of wastewater treatment. The landfill leachate pretreatment method provided by the invention comprises the steps of (1) pretreating raw water of the landfill leachate by using a coagulant, and then adding a flocculating agent for precipitation and separation to obtain a first-stage supernatant; and (2) adjusting the pH value of the first-stage supernatant obtained in the step (1) to 10-11, adding a deamination agent, and reacting and precipitating to obtain a second-stage supernatant. According to the method, the landfill leachate raw water is subjected to coagulation pretreatment, so that most suspended solids and colloids in the landfill leachate raw water can be effectively removed, and the treatment load and treatment cost of the subsequent process are reduced; and a deamination agent reacts with NH4 < + > in the wastewater to generate an MgNH4PO4. 6H2O product with a very small solubility product, so that the inhibition effect of ammonia nitrogen in the leachate on microorganisms in the subsequent treatment process is reduced.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a pretreatment method and system for landfill leachate. Background technique [0002] The water quality of landfill leachate is characterized by high ammonia nitrogen content, high organic matter concentration, poor biodegradability, and complex components. The concentration of ammonia nitrogen in the leachate of early landfills is generally 3000-4000mg / L, which mainly comes from the deamination reaction of amino acids produced by the degradation of ammonia-containing organic matter such as protein, and the hydrolysis and fermentation reaction of organic matter. The concentration of organic matter in early landfill leachate is generally 4000-8000mg / L, and the ratio of biochemical oxygen demand (BOD5) to chemical oxygen demand (COD) (ie, B / C value) is low. Aerobic biochemical treatment generally requires the nutrient ratio of wastewater to be C:N:P=100:5:1, while lan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F101/16C02F103/06
CPCC02F9/00C02F2103/06C02F2101/16C02F2001/007C02F1/66C02F1/5245C02F1/56C02F1/586C02F1/722C02F1/725C02F1/46114C02F1/4672C02F2305/026C02F2201/461
Inventor 韩全张恒
Owner GUANGDONG YEANOVO ENVIRONMENTAL PROTECTION CO LTD
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