CN215559676U

CN215559676U - Advanced treatment equipment for landfill leachate

Info

Publication number: CN215559676U
Application number: CN202022523344.4U
Authority: CN
Inventors: 萨仁娜; 王国勇; 黄刘伟; 黄海婷
Original assignee: Qinrunze Environmental Protection Co ltd
Current assignee: Qinrunze Environmental Protection Co ltd
Priority date: 2020-10-28
Filing date: 2020-10-28
Publication date: 2022-01-18
Anticipated expiration: 2030-10-28

Abstract

The utility model provides advanced treatment equipment for landfill leachate, which comprises an ozone/hydrogen peroxide combined catalytic oxidation device, an anoxic-aerobic membrane bioreactor and a micro-electrolysis Fenton advanced oxidation system which are sequentially connected, wherein the device utilizes an O3/H2O2 combined catalytic oxidation-AOMBR-micro-electrolysis Fenton combined process, and the process not only can efficiently remove organic pollutants and has a good decolorization effect, but also can effectively remove nitrate nitrogen/total nitrogen and ensure that the effluent reaches the standard and is discharged.

Description

Advanced treatment equipment for landfill leachate

Technical Field

The utility model relates to advanced treatment equipment for landfill leachate, which can remove pollutants such as organic matters, nitrate nitrogen/total nitrogen, suspended matters and the like in the landfill leachate by utilizing a combined process of O3/H2O2, catalytic oxidation, AOMBR and microelectrolysis fenton, and belongs to the technical field of sewage treatment.

Background

The landfill leachate is high-concentration sewage which is formed by sewage generated by rainwater which exceeds the water holding capacity and the surface covering potential of a soil layer covered by the garbage and flows through the garbage layer and the covered soil layer after entering a landfill, water contained in the garbage, water generated by garbage decomposition and underground infiltration water. The total nitrogen in the percolate discharged by partial landfill treatment is higher and even exceeds the standard, and the total nitrogen in the percolate of some landfill is even in a stable exceeding standard state for a long time. The total nitrogen comprises organic nitrogen, ammonia nitrogen and nitrate nitrogen, has different components and different treatment modes, and is generally divided into a physical and chemical method and a biochemical method. Different physicochemical methods are generally applied to different types of wastewater, for example, ammonia nitrogen wastewater is generally separated from the wastewater in the form of nitrogen by adopting an ammonia nitrogen remover and adding chlorine at break points; the organic nitrogen waste water is subjected to an advanced oxidation method. However, most physicochemical methods are not able to completely treat total nitrogen to a lower standard. The biological denitrification mainly comprises three main biochemical processes of ammoniation, nitrification and denitrification. The method has short hydraulic retention time and low operation cost. However, most of the denitrification links of the system using the process are limited, such as the deviation of the numerical value of the reflux ratio, the higher content of dissolved oxygen in the anoxic section and the like, the ammonia nitrogen in the effluent is reduced, the nitrate nitrogen is improved, and finally the total nitrogen still exceeds the standard.

Disclosure of Invention

In order to solve the problem that nitrate nitrogen/total nitrogen in water discharged after the landfill leachate is treated exceeds the standard, the utility model provides advanced treatment equipment for the landfill leachate, which comprises an ozone/hydrogen peroxide combined catalytic oxidation device, an anoxic-aerobic membrane bioreactor and a micro-electrolysis Fenton advanced oxidation system which are sequentially connected. Therefore, the O3/H2O2 combined catalytic oxidation-AOMBR-micro-electrolysis fenton combined process is provided, organic pollutants can be efficiently removed, the biodegradability is improved, nitrate nitrogen/total nitrogen can be effectively removed, and the effluent is discharged after reaching the standard.

The technical scheme of the utility model is as follows: the combined process technology of ozone/hydrogen peroxide (O3/H2O2) combined catalytic oxidation-anoxic-aerobic membrane bioreactor (AOMBR) -micro-electrolysis Fenton (micro-electrolysis-fenton) comprises the following steps:

O3/H2O2 (ozone/hydrogen peroxide) combined catalytic oxidation:

the landfill leachate is pretreated or biochemically treated and then enters an O3-H2O2 system for combined catalytic oxidation, and the system is an advanced oxidation method for water treatment. The synergistic effect of ozone and hydrogen peroxide can generate hydroxyl free radicals with extremely strong oxidation effect, organic pollutants in water can be effectively removed, the biodegradability of sewage is improved, no medicament is added in the reaction process, and the salinity in the sewage is not increased.

AOMBR (anoxic aerobic membrane bioreactor): after the O3-H2O2 combined catalytic oxidation, the garbage leachate enters AOMBR, the system organically combines the biological treatment part with membrane separation to replace a secondary sedimentation tank for solid-liquid separation, the membrane realizes absolute solid-liquid separation, the effluent SS is very low, and most of biomass can be retained in the tank. In the AO or double AO system, due to the limitation of a denitrification link, although the ammonia nitrogen in the effluent is reduced, the nitrate nitrogen is improved, and finally the total nitrogen still exceeds the standard. The AOMBR system reflows the membrane tank mixed liquid to the anoxic tank, and the anoxic tank utilizes the influent carbon source and the reflowing nitrifying liquid to perform denitrification so as to remove nitrate nitrogen/total nitrogen. A plurality of reactions such as organic matter degradation, aerobic nitrification and the like synchronously occur in the aerobic tank, so that pollutants in the sewage are removed; the mixed liquid is filtered by a membrane to obtain water, so that organic matters and nitrate nitrogen/total nitrogen in the sewage are removed.

Microelectrolysis-fenton (microelectrolysis fenton): the landfill leachate treated by the AO-MBR enters a micro-electrolysis-fenton advanced oxidation system, and a fenton reagent reinforced micro-electrolysis process can realize chain scission of macromolecular organic pollutants and further remove organic matters difficult to degrade. The biodegradability of the sewage treated by the method is greatly improved, the decolorization rate of the wastewater is close to 100 percent, and the sewage is ensured to be discharged after reaching the standard. Compared with micro-electrolysis, the micro-electrolysis Fenton combined process can effectively remove wastewater with complex components, and particularly has more obvious advantages on CODcr, decoloration and biodegradability, and compared with the process of adding Fe2+ into a Fenton reagent, the process not only saves the cost of the reagent, but also achieves the purpose of treating waste by waste.

Drawings

FIG. 1 is a deep treatment equipment for landfill leachate provided by the utility model

Detailed Description

1. The garbage percolate after pretreatment or biochemical treatment enters an O3/H2O2 system for combined catalytic oxidation;

2. the effluent of the O3/H2O2 system enters an AOMBR system, sludge in an aerobic tank flows back to an anoxic tank, mixed liquor in a membrane tank also flows back to the anoxic tank, and denitrification is carried out in the anoxic tank;

3. and the effluent of the AOMBR system enters a micro-electrolysis-fenton system, so that the discharge of all indexes such as organic matters, total nitrogen/nitrate nitrogen, chromaticity and the like in the effluent of the landfill leachate reaches the standard.

Claims

1. The deep treatment equipment for the landfill leachate comprises an ozone/hydrogen peroxide combined catalytic oxidation device, an anoxic-aerobic membrane bioreactor and a micro-electrolysis Fenton advanced oxidation system which are sequentially connected.