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A treatment method for landfill leachate

A technology of landfill leachate and treatment method, which is applied in the field of landfill leachate treatment in sewage treatment, and can solve the problems that the concentrated solution of pollutants cannot be treated and the heat preservation effect of the reactor is poor.

Active Publication Date: 2017-05-10
KUNMING UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

[0006] In order to overcome the shortcomings that the existing MVC process does not reduce the pollutants in the leachate and the concentrated solution cannot be processed, and the biological drying sludge in the biological evaporation technology is used as an expansion agent and a biological carrier, and the reactor insulation effect is poor. Problem, the present invention provides a kind of new process that uses biofilm sponge as bio-evaporative expansion agent and biological carrier in conjunction with MVC to treat landfill leachate; The purpose of the present invention is to utilize cheap, light weight, porous polyurethane sponge as medium, Microorganisms are domesticated and cultivated on the surface of the broken sponge, and the broken sponge after hanging the film is used as an expansion agent and a biological carrier for biological evaporation, and then MVC technology and biological evaporation technology are used to jointly treat landfill leachate; in the MVC evaporation system, after pretreatment The leachate is evaporated by high-temperature and high-pressure steam heat exchange, the steam is condensed into condensed water, and the evaporated leachate is compressed into secondary high-temperature steam, which is continuously evaporated. This process simultaneously removes the refractory biodegradable macromolecular substances in the leachate After high temperature and high pressure cracking into easily biodegradable small molecules, this improves the biodegradability of wastewater for subsequent biological evaporation

Method used

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  • A treatment method for landfill leachate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: as figure 1 Shown, the processing method technological process of this landfill leachate comprises the following steps:

[0030] (1) Preparation of biofilm sponge used as bio-evaporative expansion agent and bio-carrier

[0031] ① Crush the polyurethane sponge to a diameter of 1 mm;

[0032] ② Prepare synthetic wastewater with COD=500 mg / L, which contains glucose 0.44 g / L, yeast extract 0.06 g / L, NH 4 Cl 0.09 g / L, KH 2 PO 4 0.01 g / L, K 2 HPO 4 0.01 g / L, NaH 2 PO 4 0.067 g / L, Na 2 HPO 4 0.338 g / L, CaCl 2 2H 2 O 6.8 μg / L, MgCl 2 ·6H 2 O 12.1μg / L, FeCl 3 ·6H 2 O 0.551μg / L, MnCl 2 4H 2 O0.22μg / L, ZnSO 4 ·7H 2 O 0.0734μg / L, CuCl 2 2H 2 O 0.096μg / L, CoCl 2 ·6H 2 O 0.136 μg / L, Na 2 MoO 4 2H 2 O 0.0205μg / L;

[0033] ③Put the pulverized polyurethane sponge into the reactor, and pump the synthetic wastewater from the bottom of the reactor to ensure a hydraulic retention time of 8 h, then inoculate the activated sludge with MLSS of 2800 mg / L...

Embodiment 2

[0040] Embodiment 2: the processing method technological process of this landfill leachate comprises the following steps:

[0041] (1) Preparation of biofilm sponge used as bio-evaporative expansion agent and bio-carrier

[0042] ① Crush the polyurethane sponge to a diameter of 3 mm;

[0043] ② Prepare synthetic wastewater with COD=600 mg / L, which contains glucose 0.53 g / L, yeast extract 0.07 g / L, NH 4 Cl 0.11g / L, KH 2 PO 4 0.01 g / L, K 2 HPO 4 0.01g / L, NaH 2 PO 4 0.080g / L, Na 2 HPO 4 0.406g / L, CaCl 2 2H 2 O 8.1 μg / L, MgCl 2 ·6H 2 O 14.5μg / L, FeCl 3 ·6H 2 O0.660μg / L, MnCl 2 4H 2 O0.27μg / L, ZnSO 4 ·7H 2 O 0.0880μg / L, CuCl 2 2H 2 O 0.116μg / L, CoCl 2 ·6H 2 O 0.164 μg / L, Na 2 MoO 4 2H 2 O 0.0248μg / L;

[0044] ③Put the pulverized polyurethane sponge into the reactor, and pump the synthetic wastewater from the bottom of the reactor to ensure a hydraulic retention time of 9 h, then inoculate the activated sludge with MLSS of 3000 mg / L into the reactor, so tha...

Embodiment 3

[0051] Embodiment 3: the processing method technological process of this landfill leachate comprises the following steps:

[0052] (1) Preparation of biofilm sponge used as biological evaporation expansion agent and biological carrier:

[0053] ① Crush the polyurethane sponge to a diameter of 5 mm;

[0054] Prepare synthetic wastewater with COD=700 mg / L, its composition is glucose (0.62 g / L), yeast extract (0.08g / L), NH 4 Cl (0.12 g / L), KH 2 PO 4 (0.02 g / L), K 2 HPO 4 (0.02 g / L), NaH 2 PO 4 (0.094 g / L), Na 2 HPO 4 (0.474 g / L), CaCl 2 2H 2 O (9.5μg / L), MgCl 2 ·6H 2 O (16.9μg / L), FeCl 3 ·6H 2 O (0.771μg / L), MnCl 2 4H 2 O (0.31μg / L), ZnSO 4 ·7H 2 O (0.1030μg / L), CuCl 2 2H 2 O(0.135μg / L), CoCl 2 ·6H 2 O (0.191 μg / L), Na 2 MoO 4 2H 2 O (0.0290μg / L);

[0055] ③Put the pulverized polyurethane sponge into the reactor, and pump the synthetic wastewater from the bottom of the reactor to ensure that the hydraulic retention time is 10 h, and then inoculate the...

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Abstract

The invention discloses a method for treating landfill leachate by using biofilm sponge as a biological evaporating expanding agent and a biological carrier in combination with MVC. The method adopts an MVC system, preparation of biofilm sponge and a biological evaporating system. The biofilm sponge is prepared through inoculating polyurethane sponge with activated sludge and carrying out aerating and cultivation for acclimation; the leachate is subjected to MVC evaporation treatment to generate a concentrated liquor, and the concentrated liquor is treated through biological evaporation technology. According to the invention, metabolic heat generated by degradation of organic pollutant microorganisms in the MVC concentrated liquor is utilized to evaporate water in the concentrated liquor; the biofilm sponge which is light in weight, is easily available and is short in culture period and free of secondary pollution is used as the biological evaporating expanding agent and the biological carrier, and heat in the concentrated liquor and condensate water generated by MVC treatment are utilized for the needs of a heat source in the biological evaporating process, so that heat energy in the whole system is recycled to the maximum extent. Problems in the conventional pure physical separation process are overcome, and not only can water in the leachate be evaporated, but also polluting substances in the leachate can be reduced.

Description

technical field [0001] The invention belongs to the technical field of landfill leachate treatment in sewage treatment, and in particular relates to a method for treating landfill leachate by using a biofilm sponge as a biological evaporation expansion agent and a biological carrier in combination with MVC. Background technique [0002] With the development of cities and the improvement of people's living standards, the amount of urban domestic garbage is increasing day by day, and the disposal of garbage has become an urgent task. Sanitary landfill is one of the main methods of urban waste disposal in my country, and there is a problem of landfill leachate treatment. Landfill leachate refers to the secondary pollutants produced by extraction, hydrolysis and fermentation due to the leaching and washing of rainwater and the immersion of surface water and groundwater in the process of stacking and disposal of garbage, mainly from the internal water of the garbage itself. , Wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 潘学军杨本芹杨金明杨卉
Owner KUNMING UNIV OF SCI & TECH
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