CN101306876A - A device for treating landfill leachate - Google Patents

Abstract

A device for treating landfill leachate relates to a device for treating landfill leachate in the field of environmental protection. Comprising an upflow anaerobic bioreactor (2), a siphon (3), an intermediate water tank (4), a membrane bioreactor (5), an aeration tube (6), and a membrane module (7), the upflow The anaerobic bioreactor (2) is connected to the intermediate water tank (4) through the siphon (3); the intermediate water tank (4) is connected to the membrane bioreactor (5), the aeration pipe (6), and the membrane module (7) to the outlet water pipe (8). The device is mainly used in the treatment of urban landfill leachate. At the same time, it is used in the treatment of high-concentration wastewater in light industries such as beer and beverages, and in slaughtering industries.

Description

A device for treating landfill leachate

technical field

The invention relates to a device for treating landfill leachate in the field of environmental protection, in particular to a device for treating landfill leachate by using an upflow anaerobic bioreactor and a membrane bioreactor.

Background technique

With the rapid development of industry and the continuous improvement of people's living standards, urban waste also increases linearly, and the treatment of landfill leachate is imperative.

Biological treatment is a main treatment method for landfill leachate. The specific technical device forms of biological treatment methods include traditional activated sludge method, stabilization pond method, biological turntable method, SBR aerobic treatment technology device, UASB anaerobic treatment technology device, anaerobic fixed film bioreactor, etc. Among them, activated sludge method, biological turntable and SBR aerobic treatment technology devices have good treatment effect, short hydraulic retention time and rich operation experience, but the project investment is large, energy consumption is large, and operation and management costs are high; relatively speaking Stabilized pond treatment (combination of aerobic biological treatment and anaerobic biological treatment) is relatively simple, low in investment, and convenient in management, but the residence time of sewage is long, the floor area is large, and the removal effect on organic molecules with large particle sizes is poor and the purification Capacity varies greatly with the seasons. Using upflow anaerobic sludge blanket (UASB) alone can greatly reduce CODcr, but the CODcr value of the effluent is still high, and the landfill leachate also contains a large number of pathogenic microorganisms, and the effluent quality is still not up to the second grade Emission Standards. At present, the treatment process of urban landfill leachate mostly adopts anaerobic-aerobic biological treatment technology devices. However, the landfill leachate sewage treatment plants that have been built in China generally have poor operation effects. The main reason is that the conventional technical devices and process parameters used by these landfill leachate treatment plants are not suitable for the complex and changeable landfill leachate wastewater; at the same time, the leachate itself has the characteristics of C/N inconsistency, and the general aerobic activity Sludge treatment technology equipment, sludge cultivation is difficult, and sludge activity is poor.

Contents of the invention

The object of the present invention is to provide a landfill leachate treatment device. The device for combined treatment of landfill leachate by using an upflow anaerobic bioreactor and a membrane bioreactor can effectively treat urban landfill leachate, and the effluent water quality is good.

The purpose of the present invention is achieved through the following technical solutions:

A device for treating landfill leachate, comprising an upflow anaerobic bioreactor, a siphon, an intermediate water tank, a membrane bioreactor, an aeration tube, and a membrane module, the upflow anaerobic bioreactor is connected to the middle through the siphon The water tanks are connected; the middle water tank is connected to the membrane bioreactor, the aeration pipe, and the membrane module to the outlet pipe.

The beneficial effects of the present invention are:

1. Efficiency: Membrane modules can increase the concentration of the mixed solution in the membrane bioreactor, increase the sludge age, reduce the amount of residual sludge, and significantly improve the quality of effluent water;

2. Stability: The interception of the membrane module can almost make the removal rate of SS reach 100%, and it also has a good removal effect on chroma;

3. Economy: The high organic load of UASB can greatly reduce the area occupied by the reactor and power consumption.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the device of the present invention.

Labels in the figure: 1. Water inlet pipe, 2. UASB, 3. Siphon pipe, 4. Intermediate water tank, 5. Membrane bioreactor, 6. Aeration pipe, 7. Membrane module, 8. Water outlet pipe.

Detailed ways

In Figure 1, the landfill leachate enters the UASB (upflow anaerobic bioreactor) 2 through the water inlet pipe 1 for pretreatment. The MLSS in the UASB reactor is 5000-10000 mg/L. Due to the high organic concentration of the landfill leachate, A large amount of methane gas can be produced, and the tiny gas is attached to the granular sludge and floats up. In addition, the influent has a certain flow rate, so that the bottom sludge can be lifted. After reaching the three-phase separator, the gas, liquid and solid are separated, the gas escapes, the granular sludge sinks, and the pretreatment liquid flows into the intermediate water tank 4 through the siphon 3. The intermediate water tank not only collects the pretreatment liquid, but also protects the subsequent membrane. The feed water of the bioreactor 5 passes through the aeration pipe 6 to stabilize the flow rate. The water containing a large amount of refractory organic matter from the intermediate water tank flows into the membrane bioreactor 5. Since the membrane module 7 in the membrane bioreactor 5 has a strong solid-liquid separation function, the activated sludge in the reactor can be kept high. level, thereby improving the processing capacity of the bioreactor; secondly, the membrane module has an interception effect on macromolecular substances and biodegradable organic substances in water, increasing their residence time in the reactor, causing them to undergo hydrolysis and acidification, and macromolecules Substances are hydrolyzed into small molecular substances, and at the same time, MBR has the function of enriching bacteria that decompose refractory organic matter, so that the landfill leachate flowing out of the water outlet pipe 8 after treatment greatly improves the removal rate of organic matter. UASB pretreats high-concentration landfill leachate under normal temperature conditions, and the removal rate of BOD can be greater than 90%. Since the COD load of UASB can be as high as 10kg m-3d-1, and no energy consumption is required in the reaction process, compared with the aerobic process, it can greatly save the area of the reactor and the power consumption. For the effluent after UASB treatment, due to the long sludge age in the membrane bioreactor (MBR), a large number of microorganisms with slow proliferation such as refractory organic matter decomposing bacteria and nitrifying bacteria can be enriched, which can greatly improve the removal rate of refractory organic matter.

Claims (1)

1. the device of a treating refuse percolate, it is characterized in that including upflow type anaerobic bio-reactor (2), siphon pipe (3), intermediate water tank (4), membrane bioreactor (5), aeration tube (6), membrane module (7) constitutes, and described upflow type anaerobic bio-reactor (2) links to each other with intermediate water tank (4) through siphon pipe (3); Intermediate water tank (4) and membrane bioreactor (5), aeration tube (6), membrane module (7) is connected to rising pipe (8).

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