CN218811233U

CN218811233U - Pretreatment system for urban domestic garbage leachate

Info

Publication number: CN218811233U
Application number: CN202223288062.6U
Authority: CN
Inventors: 武超凡; 陈明; 武克亮; 关晓琳; 王怀林
Original assignee: Jiangsu Kaimi Membrane Technology Co ltd
Current assignee: Jiangsu Kaimi Membrane Technology Co ltd
Priority date: 2022-12-08
Filing date: 2022-12-08
Publication date: 2023-04-07
Anticipated expiration: 2032-12-08

Abstract

The utility model discloses a pretreatment system for urban domestic garbage leachate, which comprises an oxidation, decoloration and flocculation device, a mixing tank and a sludge dewatering device which are connected in sequence; the oxidation decoloration flocculation tank is used for oxidizing and decoloring the landfill leachate under the action of a medicament and generating flocs; the mixing tank is used for mixing the sewage from the oxidation decoloration flocculation tank with the sludge discharged by the ultrafiltration system; the sludge dewatering device comprises a screw-stacking dewaterer delivery pump and a screw-stacking dewaterer, wherein the screw-stacking dewaterer delivery pump is used for pumping mixed sewage in a mixing pool into the screw-stacking dewaterer, and the screw-stacking dewaterer is used for removing water in the mixed sewage to form sludge. The utility model provides a direct landfill leachate after with oxidation decoloration flocculation treatment uses the poor technical problem of hydroextractor dewatering effect, and makes the area of pretreatment device reduce, and sewage dwell time shortens, and sewage treatment efficiency improves.

Description

Pretreatment system for urban domestic garbage leachate

Technical Field

The utility model relates to a sewage treatment technical field, concretely relates to city domestic waste filtration liquid pretreatment system.

Background

At present, the municipal solid waste leachate mainly adopts a biological method and membrane treatment process, and the municipal solid waste leachate is high-concentration organic wastewater, and needs to be pretreated before entering biochemical treatment, flocs are generated by adding a medicament, and then the flocs are discharged from the system to relieve the pressure of subsequent biochemical treatment and keep the stable operation of an ultrafiltration system. At present, in order to relieve the shortage of urban land, leachate treatment equipment is generally designed into a highly integrated device, so that the land occupation is reduced as much as possible. The traditional flocculation sedimentation tank realizes the separation of sediment and water flow by utilizing the fact that the downward sedimentation speed of suspended impurity particles in the water flow is greater than the downward flowing speed of the water flow or the downward sedimentation time is less than the time of the water flow flowing out of the sedimentation tank, the traditional flocculation sedimentation tank occupies a large area and is not suitable for an integrated device, for example, a method for treating percolate of a garbage transfer station disclosed in Chinese patent CN 110066086A, and the method is to remove floc generated after flocculation and dosing through the traditional flocculation sedimentation tank; and the direct use of the dehydrator for removing flocs leads to poor dehydration effect due to too small amount of suspended matters contained in the landfill leachate.

SUMMERY OF THE UTILITY MODEL

For solving and exist among the current municipal refuse filtration liquid treatment process, it is big to adopt traditional flocculation sedimentation tank to get rid of floc area, directly uses the poor technical problem of hydroextractor desorption floc dewatering effect, the utility model provides a municipal domestic refuse filtration liquid pretreatment system, after mud is arranged with the mud that pretreatment system produced through the high ultrafiltration that will contain the suspended solid, the rethread folds spiral shell hydroextractor dewatering treatment, both can get rid of the floc like this, improve the dewatering effect of mud, can reduce pretreatment system's area again.

The utility model adopts the technical proposal that:

a pretreatment system for leachate of municipal domestic waste comprises an oxidation, decoloration and flocculation device, a mixing tank and a sludge dewatering device which are connected in sequence; the oxidation decoloration flocculation device comprises an oxidation decoloration tank and a dosing device, the dosing device is used for adding an oxidation decoloration agent and a flocculating agent into the oxidation decoloration flocculation tank, and the oxidation decoloration flocculation tank is used for oxidizing and decoloring the garbage percolate under the action of the agent and generating flocs; the mixing tank is used for mixing the sewage from the oxidation decoloration flocculation tank with the sludge discharged by the ultrafiltration system; the sludge dewatering device comprises a screw-stacking dewaterer delivery pump and a screw-stacking dewaterer, wherein the screw-stacking dewaterer delivery pump is used for pumping mixed sewage in the mixing pool into the screw-stacking dewaterer, and the screw-stacking dewaterer is used for removing moisture of the mixed sewage to form sludge.

Further, charge device includes sodium hypochlorite explosive box, PAC explosive box, sodium hypochlorite adds medicine measuring pump and PAC and adds medicine measuring pump, and sodium hypochlorite adds the medicine measuring pump and is arranged in storing up the sodium hypochlorite of explosive box with sodium hypochlorite and stores up the agent and add oxidation decoloration flocculation basin, and PAC adds medicine measuring pump and is arranged in adding the PAC agent of PAC explosive box to oxidation decoloration flocculation basin.

Further, a stirrer is arranged in the oxidation decoloration flocculation tank.

Further, sludge dewatering device still includes PAM explosive box and PAM adds the medicine measuring pump, and PAM adds the medicine measuring pump and is arranged in adding the PAM medicament in the PAM explosive box and fold the spiral shell hydroextractor.

Further, an aeration pipe is arranged at the bottom of the mixing tank.

Further, the oxidation, decoloration and flocculation device, the mixing tank and the sludge dewatering device are arranged in a container.

The utility model has the advantages that:

1. this application is through arranging the mud with the higher ultrafiltration system of suspended solid content after the landfill leachate that will pass through oxidation decoloration flocculation treatment and mixing, together gets into to fold the spiral shell hydroextractor and dewaters, has solved the direct landfill leachate who will pass through after oxidation decoloration flocculation treatment and has used the poor technical problem of hydroextractor dewatering effect, has promoted the desliming efficiency who folds spiral shell desliming machine greatly.

2. This application adopts oxidation decoloration pond as landfill leachate's oxidation decoloration and flocculation treatment, does not use as the sedimentation tank, and oxidation decoloration and flocculation reaction's time is shorter, and consequently the volume in oxidation decoloration pond need not set up very greatly, has reduced pretreatment device's area greatly.

3. The method has the advantages of simple process flow, short sewage retention time and high sewage treatment efficiency.

Drawings

Fig. 1 is a schematic structural view of embodiment 1 of the present invention.

Fig. 2 is a schematic structural view of embodiment 2 of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and a preferred embodiment.

Example 1

Referring to fig. 1, the embodiment provides a pretreatment system for leachate of municipal solid waste, which includes an oxidation-decolorization flocculation device 10, a mixing tank 20 and a sludge dewatering device 30 connected in sequence.

The oxidation-decoloration flocculation device 10 comprises an oxidation-decoloration flocculation tank 11, a sodium hypochlorite storage tank 13, a PAC storage tank 14, a sodium hypochlorite dosing pump 15 and a PAC dosing pump 16.

The oxidation-decolorization flocculation tank 11 can be designed into a round or rectangular tank body, and a stirrer 12 is arranged in the tank body to stir the sewage so that the sewage is mixed with the medicament to improve the reaction effect. The top of the tank body is provided with a sodium hypochlorite medicine inlet, a PAC medicine inlet and a garbage leachate inlet, and the upper end of the rear side wall of the tank body is provided with a sewage outlet. The tank body can be made of carbon steel anticorrosive materials, the volume of the tank body is selected according to the flow of sewage to be treated, and the preferred retention time of the sewage in the oxidation-decolorization flocculation tank 11 is 2-3 hours.

A sodium hypochlorite medicine storage tank 13, a PAC medicine storage tank 14, a sodium hypochlorite medicine adding metering pump 15 and a PAC medicine adding metering pump 16 are all arranged above the oxidation and decolorization flocculation tank 11, the sodium hypochlorite medicine storage tank 13 and the PAC medicine storage tank 14 are respectively used for containing sodium hypochlorite medicines and PAC medicines, an inlet and an outlet of the sodium hypochlorite medicine adding metering pump 15 are respectively connected with a medicine outlet of the sodium hypochlorite medicine storage tank 13 and a sodium hypochlorite medicine inlet of the oxidation and decolorization flocculation tank 11 through pipelines and are used for adding the sodium hypochlorite medicines in the sodium hypochlorite medicine storage tank into the oxidation and decolorization flocculation tank so as to decolorize the garbage percolate; the inlet and outlet of the PAC dosing metering pump 16 are respectively connected with the medicine outlet of the PAC medicine storage box 14 and the PAC medicine inlet of the oxidation and decoloration flocculation tank 11 through pipelines, and the PAC dosing metering pump is used for adding PAC medicines in the PAC medicine storage box into the oxidation and decoloration flocculation tank, so that garbage leachate forms flocs.

The tank body of the mixing tank 20 can be designed into a circular or rectangular shape, the bottom in the tank body is provided with an aeration pipe 21, the aeration pipe 21 is connected with a biochemical aeration system through a pipeline, and the aeration pipe 21 is used for carrying out aeration stirring on the sewage entering the mixing tank 20 and the sludge discharged by the ultrafiltration system, so that the sewage is uniformly mixed and prevented from precipitating. The top of the tank body is provided with an ultrafiltration sludge inlet, the upper end of the front side wall of the tank body is provided with a water inlet of the mixing tank, and the lower end of the rear side wall is provided with a water outlet of the mixing tank. The elevation of the water inlet of the mixing tank 20 is lower than the elevation of the sewage outlet of the oxidation-decolorization flocculation tank 11, so that after the water inlet is connected through a pipeline, the sewage in the oxidation-decolorization flocculation tank 11 can automatically flow into the mixing tank 20, and the power consumption is saved. The tank body of the mixing tank 20 can be made of carbon steel anticorrosive material, the volume of the tank body is selected according to the flow rate of sewage to be treated, and the preferred residence time of the sewage in the mixing tank 20 is 3-4 hours.

The sludge dewatering device 30 comprises a screw-stacking dewatering machine delivery pump 31, a screw-stacking dewatering machine 32, a PAM (polyacrylamide) storage tank 33 and a PAM dosing metering pump 34, wherein an inlet and an outlet of the screw-stacking dewatering machine delivery pump 31 are respectively connected with a water outlet of a mixing pool and a sludge inlet of the screw-stacking dewatering machine 32 through pipelines, and the mixed sewage in the mixing pool is pumped into the screw-stacking dewatering machine for desliming treatment. PAM explosive box 33 is used for the splendid attire PAM medicament, and PAM adds the import and export of medicine measuring pump 34 and passes through the pipeline and be connected with PAM explosive box 33 and the medicine mouth that advances of folding spiral shell hydroextractor 32 respectively for improve the desliming effect of folding spiral shell hydroextractor.

The utility model discloses the theory of operation as follows:

connecting sludge discharge of an ultrafiltration system to an ultrafiltration sludge inlet of a mixing tank 20 through a pipeline, connecting a landfill leachate inlet of an oxidation and decolorization flocculation tank 11 to an outlet of a landfill leachate sewage pump through a pipeline, and connecting an aeration pipe 21 of the mixing tank 20 to a biochemical aeration system through a pipeline;

the garbage leachate enters an oxidation and decoloration flocculation tank 11 through a sewage pump, a sodium hypochlorite medicament in a sodium hypochlorite medicament storage tank 13 is added into the oxidation and decoloration flocculation tank 11 through a sodium hypochlorite medicament adding metering pump 15, a PAC medicament in a PAC medicament storage tank 14 is added into the oxidation and decoloration flocculation tank 11 through a PAC medicament adding metering pump 16, the mixture is uniformly stirred and mixed through a stirrer 12, oxidation and decoloration reaction is carried out in the oxidation and decoloration flocculation tank 11, flocs are generated, and the sewage after the flocs are generated automatically flows into a mixing tank 20;

after the garbage leachate which is decolored and forms flocs and ultrafiltration sludge are fully mixed in the mixing tank 20, the garbage leachate and the ultrafiltration sludge are pumped into a screw-folding dehydrator 32 through a screw-folding dehydrator delivery pump 31, a PAM medicament in a PAM medicament storage box 33 is added into the screw-folding dehydrator 32 through a PAM medicament adding metering pump 34, the screw-folding dehydrator 32 removes water in the flocs to form sludge, the sludge is transported outwards for treatment, and the clear solution after the sludge is removed is subjected to subsequent biochemical treatment.

Example 2

Referring to fig. 2, the structure of the embodiment 2 is basically the same as that of the embodiment 1, except that the oxidation-decolorization flocculation apparatus 10, the mixing tank 20 and the sludge dewatering apparatus 30 are disposed in a container 40, the sludge dewatering apparatus 30 further includes a clear liquid tank 35, and the deslimed clear liquid is first stored in the clear liquid tank 35 and then pumped to the subsequent biochemical treatment through the biochemical tank intake pump.

The oxidation-decoloration flocculation tank 11 is arranged above the mixing tank 20, the elevation of the water inlet of the mixing tank 20 is lower than the elevation of the sewage outlet of the oxidation-decoloration flocculation tank 11, and therefore, after the water inlet is connected through a pipeline, sewage in the oxidation-decoloration flocculation tank 11 can automatically flow into the mixing tank 20.

The scheme that embodiment 2 shows can utilize the space by furthest, makes it integrate in integrative device, makes the utility model discloses an occupation of land is littleer, and easy to assemble and use to make landfill leachate's pretreatment more economical.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and the improvements and modifications are also within the protection scope of the present invention.

Claims

1. A pretreatment system for leachate of municipal domestic waste is characterized by comprising an oxidation, decoloration and flocculation device (10), a mixing tank (20) and a sludge dewatering device (30) which are connected in sequence;

the oxidation-decoloration flocculation device (10) comprises an oxidation-decoloration flocculation tank (11) and a dosing device, wherein the dosing device is used for adding an oxidation-decoloration medicament and a flocculation medicament into the oxidation-decoloration flocculation tank (11), and the oxidation-decoloration flocculation tank (11) is used for oxidizing and decoloring the landfill leachate under the action of the medicament and generating flocs;

the mixing tank (20) is used for mixing the sewage from the oxidation-decolorization flocculation tank (11) with the sludge discharged by the ultrafiltration system;

the sludge dewatering device (30) comprises a screw-stacking dewatering machine delivery pump (31) and a screw-stacking dewatering machine (32), the screw-stacking dewatering machine delivery pump (31) is used for pumping mixed sewage in the mixing pool (20) into the screw-stacking dewatering machine (32), and the screw-stacking dewatering machine (32) is used for removing water from the mixed sewage to form sludge.

2. The pretreatment system for the leachate of municipal solid waste according to claim 1, wherein the dosing device comprises a sodium hypochlorite dosing tank (13), a PAC dosing tank (14), a sodium hypochlorite dosing pump (15) and a PAC dosing pump (16), the sodium hypochlorite dosing pump (15) is used for adding sodium hypochlorite chemicals in the sodium hypochlorite dosing tank (13) to the oxidation and decolorization flocculation tank (11), and the PAC dosing pump (16) is used for adding PAC chemicals in the PAC dosing tank (14) to the oxidation and decolorization flocculation tank (11).

3. The pretreatment system for leachate of municipal solid waste as claimed in claim 1, wherein the oxidation-decolorization flocculation tank (11) is provided with a stirrer (12).

4. The pretreatment system for leachate of municipal domestic waste according to claim 1, wherein the sludge dewatering device (30) further comprises a PAM drug storage tank (33) and a PAM dosing pump (34), and the PAM dosing pump (34) is used for adding PAM agent in the PAM drug storage tank (33) to the screw-in-line dewaterer (32).

5. The pretreatment system for leachate of municipal solid waste as claimed in claim 1, wherein the bottom of the mixing tank (20) is provided with an aeration pipe (21).

6. The pretreatment system for leachate of municipal solid waste as claimed in claim 1, wherein the flocculation device for oxidative decolorization (10), the mixing tank (20) and the sludge dewatering device (30) are disposed in a container.