CN202688087U - Anaerobic device for treating landfill leachate - Google Patents

Abstract

The utility model relates to an anaerobic device for treating landfill leachate, comprising an anaerobic reactor, the anaerobic reactor includes a water inlet area at the bottom, a reaction area filled with activated sludge in the middle, and a water outlet area at the top. There are a number of evenly arranged water inlet branch pipes in the water inlet area. There are several mesh partitions from bottom to top in the reaction area. A layer of suspended packing is installed between two adjacent mesh partitions. The suspended packing is attached with halophilic microorganisms. The utility model sets multi-layer suspension packing from bottom to top in the anaerobic reactor, and a large amount of activated sludge and halophilic microorganisms are attached to it, so that the sludge concentration in the reactor is greatly increased, and the sewage is treated by activated sludge and microorganisms when it passes through More fully, the removal rate of COD is higher.

Description

An anaerobic device for treating landfill leachate

technical field

The utility model relates to the field of water treatment, in particular to an anaerobic device for treating landfill leachate.

Background technique

Landfill leachate refers to the moisture contained in the garbage itself in the landfill, the rain and snow water and other moisture entering the landfill, deducting the saturated water holding capacity of the garbage and the covering soil, and passing through the garbage layer and the covering soil. A high concentration wastewater. The following challenges need to be faced when processing:

1. The water quality and quantity of landfill leachate vary greatly, and the content of toxic and harmful substances is high. With the extension of landfill use time, the biodegradability of leachate is getting worse, the concentration of ammonia nitrogen is getting higher and higher, and the treatment is becoming more and more difficult. When designing the leachate treatment process, there is often a lack of sufficient understanding and adequate response to this situation, and the adopted process plan cannot adapt to this change, resulting in the leachate treatment facility barely reaching the standard in the initial stage of operation, but not after a period of time. If the standard is met, the original treatment system cannot adapt, and the pollutant removal effect is getting worse and worse. Therefore, the landfill leachate can be treated on the spot and discharged up to the standard, and the phenomenon that needs to be completely transformed is common.

2. Poor removal and biodegradability of high-concentration ammonia nitrogen. At present, most of the effluent from landfill leachate treatment cannot meet the discharge standards, mainly because ammonia nitrogen exceeds the standard, followed by COD.

① Due to the high concentration of ammonia nitrogen, the nitrification and denitrification process of traditional biochemical treatment is difficult to meet the treatment requirements. Nowadays, the blowing method is often used to remove ammonia nitrogen, which will blow off a large amount of malodorous gases such as ammonia, phenol, hydrogen sulfide, etc., causing air pollution and unpleasant stench. If it is equipped with waste gas absorption and purification equipment, the investment and operation costs will increase greatly. In addition, due to reasons such as easy corrosion, the blow-off device has poor durability. With the method of membrane separation (such as reverse osmosis), most of the separated concentrated liquid is recharged, and the recharged landfill leachate is continuously circulated, resulting in the accumulation of pollutants, especially the continuous accumulation of ammonia nitrogen. The higher the concentration, the more difficult it is to degrade.

② Due to the poor biochemical properties of the leachate, the ratio of C, N, and P is out of balance, and the content of toxic and harmful substances is high, it is not conducive to direct biochemical treatment. Especially for "middle aged" landfill leachate with high ammonia nitrogen and low carbon nitrogen ratio, it is generally considered to use chemical coagulation for pretreatment to remove metal ions and refractory high-molecular organic matter, and at the same time remove part of COD to improve biodegradability. However, the removal of part of COD often affects the lack of carbon source for subsequent biochemical denitrification, and the nitrogen removal effect is poor. To improve the nitrogen removal effect, it is necessary to add nutrients and increase the treatment cost; if part of the COD is not removed, the effluent COD Not up to standard.

As far as the current leachate treatment technology is concerned, no matter what treatment plan is adopted, biochemical anaerobic treatment is an indispensable treatment method. Through anaerobic reaction, the concentration of pollutants can be reduced and the load of subsequent processes can be reduced.

However, the landfill leachate used for biochemical treatment has the following problems: the water quality of the leachate changes greatly with the increase of the landfill age, the biodegradability is getting worse, and the leachate contains all refractory organic matter , The anaerobic efficiency is low, especially the aging landfill leachate, and the COD removal rate is lower than 40%.

Contents of the invention

In order to overcome the above-mentioned technical problems, the purpose of this utility model is to provide an anaerobic device for treating landfill leachate with high COD removal rate.

The technical scheme adopted in the utility model is:

An anaerobic device for treating landfill leachate, comprising an anaerobic reactor, the anaerobic reactor includes a water inlet area at the bottom, a reaction area filled with activated sludge in the middle, and a water outlet area at the top, the water inlet area is set There are a number of evenly arranged water inlet branch pipes. There are multiple mesh partitions from bottom to top in the reaction zone, and a layer of suspended packing is installed between two adjacent mesh partitions. The suspended packing is attached with halophilic microorganisms.

As a further improvement of the utility model, each layer of suspended packing is provided with baffles correspondingly, and the baffles of adjacent suspended packing layers are alternately fixed on the inner wall of the reactor.

As a further improvement of the utility model, the baffle is upturned and forms an acute angle with the inner wall of the reactor, and the horizontal length of the baffle is less than 2/3 of the horizontal length of the anaerobic reactor.

As a further improvement of the utility model, the suspended filler has four layers, and the suspended filler in the top layer is higher than any other layer.

As a further improvement of the utility model, an outlet pipe is connected to the top of the anaerobic reactor, and the outlet area is provided with an outlet weir connected with the outlet pipe and a three-phase separator for separating sludge, water and gas.

As a further improvement of the utility model, the three-phase separator includes multi-layer inclined plates, each layer of inclined plates is equipped with a gas outlet branch pipe, and the gas outlet branch pipe is connected with a gas discharge pipe communicating with the outside world.

As a further improvement of the utility model, the inclined plate includes an upper surface and a lower surface, the upper surface is a reflective surface that reflects the mud-water mixture flow in the water area, and the lower surface is a sedimentation surface for returning the flocculation and sedimentation sludge to the anaerobic reactor. noodle.

As a further improvement of the utility model, the bottom of the anaerobic reactor is provided with a sludge return pipe communicating with the inside of the anaerobic reactor.

As a further improvement of the utility model, the water inlet branch pipe is connected with a water inlet main pipe, and the water inlet main pipe extends out of the anaerobic reactor.

The beneficial effects of the utility model are: the utility model sets multi-layer suspension packing from bottom to top in the anaerobic reactor, and a large amount of activated sludge and halophilic microorganisms are attached to it, so that the sludge concentration in the reactor is greatly increased, and the sewage passes through When it is treated more fully by activated sludge and microorganisms, the removal rate of COD is higher.

Description of drawings

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

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a structural schematic diagram of a three-phase separator of the present invention.

Detailed ways

As shown in Figure 1, a kind of anaerobic device for treating landfill leachate comprises anaerobic reactor 1, and this anaerobic reactor 1 comprises the water inlet area at the bottom, the reaction area at the middle and the water outlet area at the top, the water inlet A number of evenly arranged water inlet branch pipes 21 are provided in the area to ensure the uniformity of water inlet to the anaerobic reactor 1 . The reaction zone is filled with a large amount of anaerobic sludge, and the sludge with good sedimentation and coagulation properties forms a sludge bed. The reaction zone is provided with a plurality of mesh partitions 3 from bottom to top, and a layer of suspended packing 4 is installed between two adjacent mesh partitions 3. Halophilic microorganisms are attached to the suspended packing 4, and the suspensions of different layers Different grades of halophilic microorganisms are attached to the filler 4 .

Further, each layer of suspended packing 4 is provided with baffles 5 correspondingly, and the baffles 5 of adjacent layers of suspended packing 4 are alternately fixed on the inner wall of the reactor. The staggered baffles 5 greatly increase the hydraulic retention time of the wastewater in the reactor, making the biochemical reaction in the reactor more sufficient and the treatment effect better.

Further, the baffle 5 is upturned and forms an acute angle with the inner wall of the reactor, and the horizontal length of the baffle 5 is less than 2/3 of the horizontal length of the anaerobic reactor 1, so as to ensure that the wastewater will not be baffled during the rising process The plate 5 blocks the formation of a "dead zone" that cannot rise, and will not affect the baffle effect because of its insufficient length.

Further, the suspended packing 4 has four layers, and the height of the suspended packing 4 on the top layer is higher than any other layer. Since the suspended filler 4 of each layer serves as a carrier for halophilic microorganisms, the concentration of halophilic microorganisms in the sludge is increased, and the decomposition rate of organic matter in wastewater is greatly improved.

During the lifting process of the wastewater in the anaerobic reactor 1, microorganisms convert the organic matter in the wastewater into biogas, and the biogas is continuously released in the form of tiny bubbles. During the rising process, the tiny bubbles are continuously merged to gradually form larger bubbles. The upper part of the mud bed forms a thinner sludge layer due to the agitation of the biogas, and rises together with the water into the water outlet area of the reactor.

Further, an outlet pipe 6 is connected to the top of the anaerobic reactor 1, and the outlet area is provided with an outlet weir 7 communicating with the outlet pipe 6 and a three-phase separator 8 for separating sludge, water and gas. The three-phase separator 8 comprises horizontally arranged multi-layer inclined plates 81, the inclined plates 81 form an angle of 30-60 degrees with the horizontal plane, each layer of inclined plates 81 is equipped with a gas outlet branch pipe 82, and the gas outlet branch pipe 82 is connected with a Gas exhaust pipe 83 . The gas outlet branch pipe 82 collects the generated biogas, and then discharges it out of the reactor through a gas outlet pipe 83, as shown in FIG. 2 .

Further, the inclined plate 81 includes an upper surface and a lower surface, the upper surface is a reflection surface 811 reflecting the mud-water mixture flow in the water area, and the lower surface is a sedimentation surface 812 for returning the flocculation and sedimentation sludge to the anaerobic reactor 1 . After the mud-water mixture entering the outlet area flows through the reflecting surface 811, the flow direction is changed and continues to rise. During the rising process, the flocculated and settled sludge returns to the anaerobic reactor 1 through the sedimentation surface 812, and the outlet water flows from the outlet weir 7 to the outlet pipe 6 .

Further, in order to prevent the loss of activated sludge, the bottom of the anaerobic reactor 1 is provided with a sludge return pipe 9 communicating with the inside of the anaerobic reactor 1 .

Further, the water inlet branch pipe 21 is connected with a water inlet main pipe 2 , and the water inlet main pipe 2 extends out of the anaerobic reactor 1 .

In Example 1, the treatment object is the initial landfill leachate, the COD is 15560-13080 mg/L, the pH is 6-8, the baffle plate 5 forms an angle of 45 degrees with the reactor wall, and the length is 100% of the horizontal length of the reactor. 1/4, COD removal rate is greater than 88%.

In Example 2, the treatment object is aging landfill leachate, the COD is 2560-3980 mg/L, the pH is 6-8, the baffle plate 5 forms an angle of 45 degrees with the reactor wall, and the length is the horizontal length of the reactor 1/4 of COD removal rate is greater than 88%.

The above descriptions are only preferred implementations of the present utility model, and they do not constitute a limitation to the protection scope of the present utility model.

Claims (9)

1. An anaerobic device for treating landfill leachate, including an anaerobic reactor (1), the anaerobic reactor (1) includes a water inlet area at the bottom, a reaction area filled with activated sludge in the middle, and an outlet water at the top area, which is characterized in that: the water inlet area is provided with a number of uniformly arranged water inlet branch pipes (21), the reaction area is provided with a plurality of mesh partitions (3) from bottom to top, and two adjacent mesh partitions A layer of suspended packing (4) is installed between the partitions (3), and halophilic microorganisms are attached to the suspended packing (4). 2. An anaerobic device for treating landfill leachate according to claim 1, characterized in that: each layer of suspended packing (4) is provided with a baffle (5) correspondingly, and the adjacent suspended packing (4) Layers of baffles (5) are staggered and fixed on the inner wall of the reactor. 3. An anaerobic device for treating landfill leachate according to claim 2, characterized in that: the baffle (5) is upturned, forming an acute angle with the inner wall of the reactor, and the baffle (5) is horizontal The length in the direction is less than 2/3 of the length in the horizontal direction of the anaerobic reactor (1). 4. An anaerobic device for treating landfill leachate according to claim 1 or 2, characterized in that: the suspended packing (4) has four layers, and the suspended packing (4) on the top layer is higher than any other layer . 5. An anaerobic device for treating landfill leachate according to claim 1, characterized in that an outlet pipe (6) is connected to the top of the anaerobic reactor (1), and the outlet area is provided with an outlet pipe (6) A connected outlet weir (7) and a three-phase separator (8) for sludge, water and gas separation. 6. The anaerobic device for treating landfill leachate according to claim 5, characterized in that: the three-phase separator (8) includes multi-layer inclined plates (81), and each layer of inclined plates (81) A gas outlet branch pipe (82) is installed, and the gas outlet branch pipe (82) is connected with a gas discharge pipe (83) communicating with the outside world. 7. The anaerobic device for treating landfill leachate according to claim 6, characterized in that: the inclined plate (81) includes upper and lower surfaces, and the upper surface is a reflective surface that reflects the mud-water mixture flow in the water area (811), the lower surface is a settling surface (812) for returning the flocculation and sedimentation sludge to the anaerobic reactor (1). 8. An anaerobic device for treating landfill leachate according to claim 1, characterized in that: the bottom of the anaerobic reactor (1) is provided with a sludge return pipe ( 9). 9. The anaerobic device for treating landfill leachate according to claim 1, characterized in that: the water inlet branch pipe (21) is connected with a water inlet main pipe (2), and the water inlet main pipe (2) extends out Anaerobic Reactor (1).

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