A kind of waste transfer station leachate decolorizing device

Abstract

The utility model discloses a kind of leachate decoloring device of garbage transfer station, including buffer water tank and ozone generator, the buffer water tank is connected by pipeline to lift pump, the output end of the lift pump is fixedly connected membrane contact reactor, the ozone generator is connected by pipeline to membrane contact reactor, one end of the ozone tail gas discharged by membrane contact reactor is connected by pipeline to tail gas breaker;Membrane contact reactor is used as gas-liquid reaction carrier, so that ozone utilization efficiency is close to 100%, oxidation effect is good, while reducing operating cost;Membrane contact reactor can reduce the land area and height of ozone oxidation device, facilitate intensive arrangement.

Description

Technical Field

[0001] This utility model relates to the field of landfill leachate treatment technology, specifically a decolorization device for leachate from a landfill transfer station. Background Technology

[0002] During the transfer of municipal solid waste, horizontal compression technology is typically used to save on vehicle capacity. This process, involving dumping and compression, generates a large amount of leachate. Due to its unpleasant odor and the presence of harmful pollutants such as heavy metals and organic matter, and because biological treatment systems cannot handle the COD and ammonia nitrogen loads in the leachate, it cannot be directly discharged into the municipal sewage network and requires pretreatment. Currently, the discharge of leachate complies with the standards and limits stipulated in the "Pollution Control Standard for Municipal Solid Waste Landfills" (GB 16889-2008). Leachate from waste transfer stations is fresh leachate, and its treatment generally employs a process flow of "pretreatment + anaerobic / hydrolysis + nitrification / denitrification - MBR + advanced treatment." The emission standard limits the color concentration at a ratio of 40 times (dilution factor), thus requiring an additional decolorization treatment process.

[0003] Currently, the main devices used for decolorizing landfill leachate include ozone oxidation towers, activated carbon adsorption tanks, Fenton oxidation, and sodium hypochlorite oxidation. Among these, ozone oxidation towers are tall, occupy a large area, and have low ozone utilization efficiency, making them unsuitable for decolorizing leachate from landfill transfer stations. Activated carbon adsorption is effective, but its adsorption capacity is small, requiring frequent replacement and difficult regeneration, resulting in high operating costs. Fenton oxidation produces sludge, causing secondary pollution. Sodium hypochlorite oxidation has weak oxidation capacity, leading to recoloring of the decolorized wastewater and poor operational stability. Utility Model Content

[0004] The purpose of this invention is to provide a decolorization device for leachate from a waste transfer station to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a leachate decolorization device for a waste transfer station, comprising a buffer tank and an ozone generator, wherein the buffer tank is connected to a booster pump via a pipeline, the output end of the booster pump is fixedly connected to a membrane contact reactor, the ozone generator is connected to the membrane contact reactor via a pipeline, and one end of the membrane contact reactor that discharges ozone tail gas is connected to a tail gas destroyer via a pipeline.

[0006] Preferably, the membrane contact reactor is filled with a hollow fiber membrane, which is encapsulated with aliphatic polyurethane resin. The membrane contact reactor is provided with an ozone inlet and an ozone exhaust outlet, and the side surface of the membrane contact reactor is provided with a landfill leachate inlet and a compliant discharge outlet.

[0007] Preferably, the flow channel of the ozone gas is a hollow fiber membrane tube side, and the flow channel of the landfill leachate is a hollow fiber membrane shell side.

[0008] Preferably, the outer shell of the membrane contact reactor is made of SS316L, the membrane fiber is made of polytetrafluoroethylene, and the encapsulating adhesive between the membrane fiber and the outer shell is made of aliphatic polyurethane resin.

[0009] Compared with the prior art, the beneficial effects of this utility model are: by using a membrane contact reactor as a gas-liquid reaction carrier, the ozone utilization efficiency is close to 100%, the oxidation effect is good, and the operating cost is reduced; the membrane contact reactor can reduce the footprint and height of the ozone oxidation device, which is convenient for compact layout. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0011] Figure 2 This is a schematic diagram of the membrane contact reactor structure of this utility model.

[0012] In the diagram: 1. Buffer tank; 2. Booster pump; 3. Membrane contact reactor; 31. Hollow fiber membrane; 32. Aliphatic polyurethane resin; 33. Ozone inlet; 34. Ozone exhaust outlet; 35. Landfill leachate inlet; 36. Compliant discharge outlet; 4. Ozone generator; 5. Exhaust gas destroyer. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0014] Please refer to 1-2. One embodiment of this utility model provides: a leachate decolorization device for a landfill transfer station, comprising a buffer tank 1 and an ozone generator 4. The buffer tank 1 is connected to a lift pump 2 via a pipeline. The lift pump 2 has a head of 8-10m and is frequency-controlled. The output end of the lift pump 2 is fixedly connected to a membrane contact reactor 3 and a landfill leachate inlet 35. The ozone generator 4 is connected to the membrane contact reactor 3 via a pipeline. The ozone generator 4 uses an oxygen source and controls the ozone concentration at the outlet at 120-140 mg / L. The ozone generator 4 is connected to an ozone inlet 33 via a pipeline. One end of the membrane contact reactor 3 that discharges ozone tail gas is connected to a pipeline... Connect to exhaust gas destroyer 5, which is existing technology and will not be described here; after pretreatment, biochemical treatment and MBR membrane filtration, the leachate from the waste transfer station is collected in buffer tank 1. The booster pump 2 pumps the leachate into the membrane contact reactor 3. At the same time, the ozone generated by the ozone generator 4 is also introduced into the membrane contact reactor 3. Driven by the concentration difference, the ozone crosses the gas phase boundary layer, the membrane and liquid phase boundary layer, diffuses into the liquid phase, reacts with the organic pollutants in the leachate, oxidizes the chromophores, and achieves the decolorization effect. The residual exhaust gas is discharged into the atmosphere after the trace amount of ozone is removed by the exhaust gas destroyer 5. After the decolorized leachate meets the emission standards, it is directly discharged into the pipeline network.

[0015] The membrane contact reactor 3 serves as the carrier for the contact reaction between ozone and leachate. Hollow fiber membranes 31 are filled inside the membrane contact reactor 3 and encapsulated by aliphatic polyurethane resin 32. The membrane contact reactor 3 is equipped with an ozone inlet 33 and an ozone exhaust outlet 34. The side surface of the membrane contact reactor 3 is equipped with a landfill leachate inlet 35 and a compliant discharge outlet 36. The ozone membrane contactor decolorization technology uses a membrane contactor as the carrier for gas-liquid mass transfer, combining membrane separation and gas mass transfer technologies. The gas and liquid phases are separated by the membrane, and ozone molecules diffuse into the liquid phase, achieving the ozone oxidation effect. Simultaneously, the membrane surface provides a relatively large specific surface area. The ozone membrane contactor technology features a small equipment footprint, high ozone utilization efficiency, and good decolorization effect, making it suitable for deep decolorization treatment of landfill leachate.

[0016] The flow path for ozone gas is a hollow fiber membrane tube side, while the flow path for landfill leachate is a hollow fiber membrane shell side.

[0017] The outer shell of the membrane contact reactor 3 is made of SS316L, the membrane fiber is made of polytetrafluoroethylene, and the encapsulating adhesive between the membrane fiber and the outer shell is made of aliphatic polyurethane resin.

Claims

1. A leachate decolorizing device for waste transfer station, comprising a buffer water tank (1) and an ozone generator (4), characterized in that: The buffer tank (1) is connected to the booster pump (2) through a pipe. The output end of the booster pump (2) is fixedly connected to the membrane contact reactor (3). The ozone generator (4) is connected to the membrane contact reactor (3) through a pipe. One end of the membrane contact reactor (3) that discharges ozone tail gas is connected to the tail gas destroyer (5) through a pipe.

2. The leachate decolorizing device for waste transfer station according to claim 1, characterized in that: The membrane contact reactor (3) is filled with a hollow fiber membrane (31), which is encapsulated by aliphatic polyurethane resin (32). The membrane contact reactor (3) is provided with an ozone inlet (33) and an ozone exhaust outlet (34). The side surface of the membrane contact reactor (3) is provided with a landfill leachate inlet (35) and a qualified discharge outlet (36).

3. The leachate decolorizing device for a waste transfer station according to claim 2, characterized in that: The flow channel for the ozone gas is a hollow fiber membrane tube side, and the flow channel for the landfill leachate is a hollow fiber membrane shell side.

4. The leachate decolorizing device for waste transfer station according to claim 1, characterized in that: The outer shell of the membrane contact reactor (3) is made of SS316L, the membrane fiber is made of polytetrafluoroethylene, and the encapsulation adhesive between the membrane fiber and the outer shell is made of aliphatic polyurethane resin.

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