CN204981478U - Leachate treatment system - Google Patents

Abstract

The utility model relates to a leachate treatment system, which comprises a raw water adjustment pool, a Fenton oxidation treatment system, a BAF treatment system, a dosing tank and a clear water pool; it is characterized in that the Fenton oxidation treatment system includes a pH adjustment pool, A Fenton oxidation pond and a neutralization sedimentation pond; the BAF treatment system includes a denitrification BAF pond and an oxidation/nitrification BAF pond. Fenton's oxidation reagent produces extremely strong oxidizing hydroxyl radicals, which can effectively decompose toxic and refractory organic matter, and finally produce carbon dioxide and water. In this way, the biodegradability of the wastewater can be effectively improved, and at the same time, the chromaticity of the wastewater can be well reduced. At the same time, BAF integrates the functions of biofilm oxidation degradation and filter layer filtration. It is a new type of sewage treatment technology. It has the advantages of small pool volume, small footprint, good effluent quality, and simple process. The filter can save treatment costs. Improve effluent quality.

Description

A leachate treatment system

technical field

The utility model belongs to the technical field of garbage treatment, in particular to a leachate treatment system.

Background technique

With the expansion of my country's cities, the increase of urban population and the improvement of residents' living standards, the output of my country's municipal solid waste is also rising sharply. Especially in Shanghai, Guangzhou and other big cities, the per capita daily waste production has exceeded 1kg, which is close to the level of industrially developed countries. According to the principle of "harmless, reduction, and resourceful" in my country's waste disposal, a large number of sanitary landfills for domestic waste will be built. Whether landfill leachate can be treated and discharged up to standard is one of the important indicators to measure whether a landfill is a sanitary landfill.

Landfill and incineration are the main methods of waste disposal at present. However, landfill leachate pollution is an unavoidable problem in the existing solid waste treatment and future landfill processes. Landfill leachate will cause serious environmental pollution to the surrounding groundwater, surface water and soil. In the process of using landfills and incineration plants to process and comprehensively manage municipal solid waste, one of the main tasks is to use appropriate methods to treat landfill leachate to avoid secondary pollution to the surrounding environment.

Leachate is a kind of wastewater with a very complex composition, containing a variety of refractory organic components and ammonia nitrogen, and has the characteristics of high pollutant concentration, strong toxicity, and large fluctuations in water quality and water volume. Commonly used advanced treatment methods for landfill leachate include reverse osmosis, chemical oxidation, coagulation sedimentation, and activated carbon adsorption. At present, nanofiltration/reverse osmosis membrane filtration process is commonly used in China. This process can meet the requirements of the new standard, but at the same time, it will produce about 30% of the total influent concentrated water that is difficult to treat. The content of the concentrated solution after membrane filtration is more complicated. The current common method is to recharge to the landfill. Long-term recharge will cause the water quality of the entire treatment system to become complicated and the load to increase. Further treatment methods include evaporation treatment and advanced oxidation treatment. Evaporation treatment is relatively thorough, and the investment and operating costs are relatively high, while advanced oxidation treatment has the disadvantage of incomplete treatment.

The method and process of advanced treatment of landfill leachate directly by chemical oxidation. Advanced Oxidation Process (AOPs) usually refers to the process of oxidatively degrading organic pollutants by generating highly reactive hydroxyl radicals (HO·) at ambient temperature and pressure. Treatment technologies, including O ₃ oxidation, Fenton oxidation, photocatalytic oxidation, and their combined oxidation technologies. Advanced oxidation technology produces a large amount of highly reactive HO, which can completely mineralize part of the organic matter, and also has the ability to degrade organic pollutants that are difficult to biodegrade in wastewater. Therefore, the application of advanced oxidation technology in the treatment of difficult biodegradable wastewater Gaining importance.

Advanced oxidation processes such as O ₃ oxidation, Fenton oxidation, UV/O ₃ , UV/Fe ²⁺ , H ₂ O ₂ , UV/TiO ₂ and other processes are used to decompose refractory organic substances (such as humic acid, etc.) in landfill leachate is efficient. In terms of engineering, if these processes are used alone to treat landfill leachate, the cost is very high.

Contents of the invention

The utility model provides a leachate treatment system, which comprises a raw water adjustment tank, a Fenton oxidation treatment system, a BAF treatment system, a dosing tank and a clear water tank; the Fenton oxidation treatment system comprises a pH adjustment tank, a Fenton oxidation treatment system and a middle and sedimentation tank; BAF treatment system includes denitrification BAF tank and oxidation / nitrification BAF tank; wherein, the outlet of the raw water adjustment tank is connected with the inlet of the pH adjustment tank through pipelines, and the outlet of the pH adjustment tank is connected with the inlet pipe of the Fenton oxidation tank The outlet of the Fenton oxidation tank is connected to the inlet of the neutralization sedimentation tank through pipelines, the dosing tank is connected to the pH adjustment tank, the Fenton oxidation tank and the pipeline of the neutralization sedimentation tank respectively, and the outlet of the neutralization sedimentation tank is connected to the pipeline of the neutralization sedimentation tank. The inlet pipeline of the denitrification BAF pool is connected, and the outlet of the denitrification BAF pool is connected to the inlet of the oxidation/nitrification BAF pool through a pipeline. The inlet of the nitrification BAF is connected, and the outlet of the oxidation/nitrification BAF pool is connected to the clear water pool through pipelines.

The leachate treatment system also includes a stirring device.

The medicine adding tank contains acid, alkali, H ₂ O ₂ and FeSO 4 .

The number of neutralization sedimentation tanks is 2.

The leachate treatment system described in the present invention has the following advantages: the Fenton oxidation reagent produces extremely strong oxidative hydroxyl radicals, which can effectively decompose toxic and refractory organic matter, and finally produce carbon dioxide and water. In this way, the biodegradability of the wastewater can be effectively improved, and at the same time, the chromaticity of the wastewater can be well reduced. At the same time, BAF integrates the functions of biofilm oxidation degradation and filter layer filtration. It is a new type of sewage treatment technology. It has the advantages of small pool volume, small footprint, good effluent quality, and simple process. The filter can save treatment costs. Improve water quality.

Description of drawings

Fig. 1 is a structural block diagram of the utility model.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described.

The wastewater enters the pH adjustment pool of the Fenton oxidation treatment system through the raw water adjustment pool, and adjusts the pH value, and adjusts the pH value to 3~4 with dilute sulfuric acid; then enters the Fenton oxidation pool, and adds Fenton reagent for oxidation, mainly to remove COD and NH ₃ -N, the effluent enters the neutralization sedimentation tank, adds lye to neutralize to neutrality, and then precipitates; the neutralization sedimentation tank adopts the alternate operation mode of two pools to achieve a good sedimentation effect. The effluent from the neutralization sedimentation tank enters the denitrification BAF tank for denitrification. The nitrification liquid returned from the oxidation/nitrification BAF tank is denitrified and denitrified, and then enters the oxidation/nitrification BAF tank for oxidation and nitrification reactions. Part of it is refluxed, and the effluent enters the Clean water pool, up to standard discharge.

The above are only preferred implementations of the utility model, and the scope of protection of the utility model is not limited to the above-mentioned embodiments, and all technical solutions under the thinking of the utility model all belong to the scope of protection of the utility model. It should be pointed out that for those of ordinary skill in the art, some improvements and modifications without departing from the principle of the utility model should be regarded as the protection scope of the utility model.

Claims (4)

1. a percolation liquid treating system, comprises former water equalizing tank, Fenton oxidation treatment system, BAF treatment system, grug feeding jar and clean water basin, it is characterized in that, described Fenton oxidation treatment system comprises pH regulator pond, Fenton oxidation pond and neutralization precipitation pond, described BAF treatment system comprises denitrification BAF pond and oxidation/nitrated BAF pond, wherein, the outlet of former water equalizing tank is connected by the entrance of pipeline with pH regulator pond, the outlet in pH regulator pond is connected with the entrance pipe in Fenton oxidation pond, the outlet in Fenton oxidation pond is connected by the entrance of pipeline with neutralization precipitation pond, grug feeding jar respectively with pH regulator pond, Fenton oxidation pond is connected with neutralization precipitation pond pipeline, the outlet in neutralization precipitation pond is connected with the entrance pipe in denitrification BAF pond, the outlet in denitrification BAF pond is connected by the entrance of pipeline with oxidation/nitrated BAF pond, oxidation/nitrated BAF pond is also provided with nitrification liquid refluxing opening, this refluxing opening is connected by the entrance of pipeline with denitrification BAF, the water outlet in oxidation/nitrated BAF pond is connected with clean water basin by pipeline.

2. percolation liquid treating system according to claim 1, is characterized in that: described percolation liquid treating system also comprises whipping appts.

3. percolation liquid treating system according to claim 1, is characterized in that: containing acid, alkali, H in described grug feeding jar ₂o ₂and FeSO4.

4. percolation liquid treating system according to claim 1, is characterized in that: described neutralization precipitation pond quantity is 2.