CN205442960U - A landfill leachate treatment system - Google Patents

Abstract

The utility model belongs to the effluent disposal system, concretely relates to landfill leachate treatment system. The landfill leachate treatment system comprises an active bacteria group bioreactor, a first regulating tank, a first dosing mixing tank, a first sedimentation tank, an aeration tank, a second regulating tank, a second dosing mixing tank and a second sedimentation tank which are connected in sequence; the landfill leachate treatment system also comprises a sludge dewatering device; the first sedimentation tank and the second sedimentation tank are respectively connected with a sludge dewatering device. The utility model discloses the system is simple, the treatment effect is reliable and stable, and the mud after the dehydration can reach the moisture content below 60%, and area is less, and processing cost is lower, and no secondary pollution produces.

Description

A landfill leachate treatment system

technical field

The utility model belongs to a waste water treatment system, in particular to a landfill leachate treatment system.

Background technique

During the stacking and landfilling of domestic waste, due to biochemical degradation such as compaction and fermentation, and at the same time, a liquid with a high concentration of organic or inorganic components is produced under the seepage of precipitation and groundwater, which is called landfill leachate. .

Landfill leachate has a high concentration of pollutants, the highest concentration of CODcr and BOD5 can reach thousands to tens of thousands, and the water quality is complex, containing a variety of toxic and harmful inorganic and organic substances. Compared with urban sewage, landfill leachate has a much higher concentration, so leachate cannot be directly discharged into urban sewage treatment pipes without strict treatment.

At present, the treatment methods of landfill leachate are mainly the combination of biological method and membrane method, and evaporation method. The traditional physical and chemical method is mostly used in the pretreatment of landfill leachate due to the excessive use of chemicals and the problem of secondary pollution. The biological method of landfill leachate consumes a lot of energy, and because the ratio of carbon, nitrogen and phosphorus in landfill leachate is not suitable, it will cause difficulties in operation and management and increase operating costs; the evaporation method consumes a lot of energy, and will produce odor and ammonia. cause secondary pollution.

Utility model content

In order to overcome the deficiencies and shortcomings of the prior art, the purpose of this utility model is to provide a landfill leachate treatment system, the system has a stable and reliable treatment effect, and the dehydrated sludge can reach a moisture content below 60%, occupying a relatively small area Small, low processing cost, no secondary pollution.

The purpose of this utility model is achieved through the following technical solutions:

A landfill leachate treatment system, comprising sequentially connected active bacterial group bioreactors, a first regulating tank, a first dosing and mixing tank, a first sedimentation tank, an aeration tank, a second regulating tank, and a second dosing and mixing tank pool, the second sedimentation tank;

The landfill leachate treatment system also includes a sludge dewatering device; the first sedimentation tank and the second sedimentation tank are respectively connected to the sludge dewatering device;

The landfill leachate treatment system also includes a grid; the grid is connected to the bioreactor of the active bacterial mass;

The landfill leachate treatment system also includes a first sludge pump; the first sedimentation tank is connected to the sludge dewatering device through the first sludge pump;

The landfill leachate treatment system also includes a second sludge pump; the second sedimentation tank is connected to the sludge dewatering device through the second sludge pump;

Preferably, the first sedimentation tank is a inclined plate sedimentation tank;

Preferably, the second sedimentation tank is an inclined plate sedimentation tank;

Preferably, the sludge dewatering device is a plate and frame filter press or a centrifugal dehydrator;

The principle of the utility model: the landfill leachate passes through the grid, the active bacterial group bioreactor, the first regulating tank, the first dosing mixing tank, the first sedimentation tank, the aeration tank, the second regulating tank, the second adding Medicine mixing tank and the second sedimentation tank for treatment; among them, active bacteria clusters are regularly added to the active bacteria cluster bioreactor for preliminary adjustment and treatment of wastewater; acid and alkali are added to the first adjustment tank and the second adjustment tank to adjust the landfill seepage The pH value of the filtrate; add high-efficiency ion flocculants in the first dosing mixing tank and the second dosing mixing tank to mix with landfill leachate; for the sludge settled in the first sedimentation tank and the second sedimentation tank, through the sludge After pumping, high-efficiency ionic flocculant is added to mix and stir the sludge, and then enter the sludge dewatering device.

Compared with the prior art, the utility model has the following advantages and effects:

(1) For the treatment of landfill leachate in this utility model, the active bacteria group is added first, which can greatly remove biodegradable pollutants, and then the high-efficiency ion flocculant is used to precipitate and remove most non-biodegradable pollutants. This method can reduce the amount of high-efficiency ion flocculant and ensure the treatment effect of high-efficiency ion flocculant.

(2) After the sedimentation sludge is dehydrated by the sludge dehydration device, the water content can be reduced to below 60%, and it can be directly landfilled or incinerated to reduce the treatment cost.

(3) The residence time of landfill leachate in the landfill leachate treatment system can be designed within 6 hours, so the landfill leachate treatment system occupies less space and is convenient for site placement.

Description of drawings

Fig. 1 is a structural schematic diagram of the landfill leachate treatment system of the present invention.

detailed description

The utility model will be further described in detail below in conjunction with the embodiments and accompanying drawings, but the implementation of the utility model is not limited thereto.

As shown in Figure 1, a landfill leachate treatment system includes an active bacterial mass bioreactor 2, a first regulating tank 3, a first dosing mixing tank 4, a first sedimentation tank 5, and an aeration tank 6 connected in sequence , the second adjustment tank 7, the second dosing mixing tank 8, the second sedimentation tank 9;

The landfill leachate treatment system also includes a sludge dewatering device 10; the first settling tank 5 and the second settling tank 9 are respectively connected to the sludge dewatering device 10;

The landfill leachate treatment system also includes a grille 1; the grille 1 is connected to the bioreactor 2 of active bacterial mass;

The landfill leachate treatment system also includes a first sludge pump 11; the first sedimentation tank 5 is connected to the sludge dewatering device 10 through the first sludge pump 11;

The landfill leachate treatment system also includes a second sludge pump 12; the second sedimentation tank 9 is connected to the sludge dewatering device 10 through the second sludge pump 12;

Preferably, the first settling tank 5 is a inclined plate settling tank;

Preferably, the second settling tank 9 is an inclined plate settling tank;

Preferably, the sludge dewatering device 10 is a plate and frame filter press or a centrifugal dehydrator;

The method for using the landfill leachate treatment system to treat landfill leachate includes the following steps:

(1) The high-concentration landfill leachate produced by the waste-to-energy plant first enters the grid 1 to remove larger impurities, and then enters the active bacterial mass bioreactor 2, and regularly adds active bacterial mass to the active bacterial mass bioreactor (including aerobic bacteria and anaerobic bacteria, the addition amount is 0.5-1.0 liters per ton of leachate) for preliminary adjustment of landfill leachate;

(2) The garbage permeate through preliminary adjustment enters the first adjustment tank 3, and acid is added to reduce the pH value of the garbage permeate to 4, and then alkali is added to adjust the pH value of the garbage permeate to 7, thereby killing the sewage in the waste water. Bacteria, to avoid negative effects on the high-efficiency ion flocculant; then the garbage permeate enters the first mixed dosing pool 4, and the high-efficiency ion flocculant (mainly composed of aluminum silicate mixture, hydrogen Calcium oxide and nucleoside, the addition amount is 50-100 g/ton of leachate), the garbage permeate is stirred rapidly (1500 rpm), and then stirred slowly (750 rpm), and enters the first Sedimentation tank 5; Then enter the aeration tank 6 for aeration treatment (the aeration mode is continuous aeration);

(3) The waste water after step (2) treatment enters the second regulating pond 7 and the pH value is adjusted to 7, then enters the second mixing and dosing pond 8, and adds high-efficiency ion flocculant in the second mixing and dosing pond 8; The waste water enters the second settling tank 9 after rapid stirring (1500 rpm) and slow stirring (750 rpm), and the effluent of the second settling tank 9 can reach the "Water Quality Standard for Sewage Discharged into Urban Sewers" (CJ343-2010) and the three-level comprehensive sewage discharge standard are discharged into the urban sewage pipe network;

(4) For the sludge settled in the first sedimentation tank 5 and the second sedimentation tank 9, it is transported by the first sludge pump 11 and the second sludge pump 12, and after adding high-efficiency ion flocculant and mixing with the sludge, it enters The sludge dehydrator 10 performs dehydration processing.

The utility model has the advantages of simple system, stable and reliable treatment effect, the water content of the dehydrated sludge can reach below 60%, the residence time of the landfill leachate in the landfill leachate treatment system can be designed within 6 hours, and the occupied area is small. It is convenient to place on the site, the treatment cost is low, and there is no secondary pollution.

The above-mentioned embodiment is a preferred implementation mode of the present utility model, but the implementation mode of the present utility model is not limited by the above-mentioned embodiment, and any other changes, modifications and substitutions made without departing from the spirit and principle of the present utility model , combination, and simplification, all should be equivalent replacement methods, and are all included in the protection scope of the present utility model.

Claims (8)

1. a garbage percolation liquid treating system, it is characterised in that: the active cenobium bioreactor that includes being sequentially connected with, the first regulating reservoir, the first dosing mixing pit, the first sedimentation tank, Aeration tank, the second regulating reservoir, the second dosing mixing pit, the second sedimentation tank.

Garbage percolation liquid treating system the most according to claim 1, it is characterised in that:

Described garbage percolation liquid treating system also includes grid；Grid is connected with activity cenobium bioreactor.

Garbage percolation liquid treating system the most according to claim 1, it is characterised in that:

Described garbage percolation liquid treating system also includes sludge dehydration device；First sedimentation tank, the second sedimentation tank are connected with sludge dehydration device respectively.

Garbage percolation liquid treating system the most according to claim 3, it is characterised in that:

Described garbage percolation liquid treating system also includes the first sludge pump；First sedimentation tank is connected with sludge dehydration device by the first sludge pump.

Garbage percolation liquid treating system the most according to claim 3, it is characterised in that:

Described garbage percolation liquid treating system also includes the second sludge pump；Second sedimentation tank is connected with sludge dehydration device by the second sludge pump.

Garbage percolation liquid treating system the most according to claim 1, it is characterised in that:

The first described sedimentation tank is inclined-plate clarifying basin.

Garbage percolation liquid treating system the most according to claim 1, it is characterised in that:

The second described sedimentation tank is inclined-plate clarifying basin.

Garbage percolation liquid treating system the most according to claim 3, it is characterised in that:

Described sludge dehydration device is filter press or centrifugal dehydrator.