CN218951202U

CN218951202U - Pretreatment device for landfill leachate membrane concentrate

Info

Publication number: CN218951202U
Application number: CN202223496346.4U
Authority: CN
Inventors: 马雪林; 陈利军; 杜军; 刘颖诗
Original assignee: Beikong Technical Service Guangdong Co ltd
Current assignee: Beikong Technical Service Guangdong Co ltd
Priority date: 2022-12-27
Filing date: 2022-12-27
Publication date: 2023-05-02
Anticipated expiration: 2032-12-27

Abstract

A pretreatment device for landfill leachate membrane concentrate comprises a pretreatment device box body, wherein a water inlet pipe is arranged on the side wall of the pretreatment device box body, and the pretreatment device box body is divided into an acid regulating area, an oxidation area, an alkali regulating area, a flocculation area and a sedimentation area which are sequentially distributed along the process flow through partition plates; wherein, the acid regulating area is matched with a dilute sulfuric acid agent preparation device and a ferrous sulfate agent preparation device, the oxidation area is matched with a hydrogen peroxide agent preparation device, the alkali regulating area is matched with a liquid alkali agent preparation device, the flocculation area is matched with a PAM dosing preparation device, the sedimentation area is positioned on the water outlet side of the pretreatment device box body, and the side wall is provided with a drain pipe; the bottom of the sedimentation zone is provided with a plurality of mud hoppers, inclined pipe fillers and water collecting tanks in turn. The utility model can reduce the accumulation of pollutants in the reservoir area of the landfill site caused by the recharging of the landfill liquid film concentrate sewage, and influence the operation efficiency of the landfill leachate treatment system, thereby causing the phenomenon of exceeding the standard of the effluent of the landfill leachate treatment system.

Description

Pretreatment device for landfill leachate membrane concentrate

Technical Field

The utility model belongs to the field of landfill leachate treatment, and particularly relates to a pretreatment device for landfill leachate membrane concentrate.

Background

Due to the characteristics of complex components, high pollutant concentration, large water quality and water quantity change and the like, the single treatment method hardly meets the emission requirements of GB 16889-2008. In order to meet the standard leachate discharge requirement, the living building department and the original environment protection respectively make a "technical specification for sanitary landfill treatment of domestic garbage" (GB 50869-2013) and a "technical specification for treatment engineering of leachate in a domestic garbage landfill (trial run)" (HJ 564-2010), and all recommended to select a combination process of pretreatment, biological treatment, advanced treatment or pretreatment, advanced treatment and the like. Wherein the representative process is as follows: anaerobic biological treatment + MBR + nanofiltration + reverse osmosis.

(1) And (5) pretreatment. The main function is to provide better water inlet condition for improving the subsequent biological treatment, and the selected treatment processes comprise coagulating sedimentation, hydrolytic acidification, advanced oxidation and the like.

(2) Biological treatment. The main function is to efficiently remove total nitrogen and COD. The effect of the anaerobic, anoxic and aerobic Membrane Bioreactor (MBR) as a biological treatment unit for removing total nitrogen and COD is recognized, and the process also becomes the most mature process for the application of the domestic landfill leachate biological treatment unit at present.

(3) And (5) deep treatment. If the quality of the treated effluent meets the emission standard of (GB 16889-2008), it is necessary to select a deep treatment. The common advanced treatment technology is membrane treatment technology, mainly comprising Nanofiltration (NF) and Reverse Osmosis (RO), which can be used in series or in parallel. Membrane treatment belongs to a separation route, and can simultaneously produce up-to-standard water with lower pollutant concentration and concentrated solution with higher pollutant concentration. Under the treatment mode, the produced percolate concentrated solution is usually subjected to recharging or reflux mode, so that pollutants are continuously enriched in a landfill, the effective and stable operation of a percolate treatment system is influenced, and the landfill leachate film concentrated solution with higher pollutant concentration is difficult to treat and reach the standard.

Disclosure of Invention

The utility model aims to overcome the problems in the prior art and provide a pretreatment device for a landfill leachate membrane concentrate.

In order to achieve the technical purpose and the technical effect, the utility model is realized by the following technical scheme:

the pretreatment device for the landfill leachate membrane concentrated solution is connected with a concentrated solution outlet of a nanofiltration system and comprises a pretreatment device box body, wherein a water inlet pipe is arranged on the side wall of the pretreatment device box body, a water inlet of the water inlet pipe is connected with the concentrated solution outlet of the nanofiltration system, a separation plate is vertically arranged in the pretreatment device box body, and the pretreatment device box body is separated into an acid regulating area, an oxidation area, an alkali regulating area, a flocculation area and a sedimentation area which are sequentially distributed along the process flow by the separation plate; the acid regulating area is matched with a dilute sulfuric acid agent preparation device and a ferrous sulfate agent preparation device, the oxidation area is matched with a hydrogen peroxide agent preparation device, the alkali regulating area is matched with a liquid alkali agent preparation device, the flocculation area is matched with a PAM dosing preparation device, the sedimentation area is positioned on the water outlet side of the pretreatment device box body, and a drain pipe is arranged on the side wall; the bottom of the sedimentation zone is provided with a plurality of mud hoppers, inclined pipe fillers and water collecting tanks in turn.

Further, stirring devices are arranged in the acid adjusting region, the oxidation region, the alkali adjusting region and the flocculation region.

Further, the partition plates between the acid regulating area and the oxidation area and the partition plates between the alkali regulating area and the flocculation area are not contacted with the bottom of the pretreatment device box body; and overflow ports are arranged above the partition plates between the oxidation zone and the alkali regulating zone and between the flocculation zone and the sedimentation zone.

Further, the bottom of each mud bucket is correspondingly provided with a mud pipe with a mud valve.

Further, the water inlet pipe is lower than the water outlet pipe.

Further, the water collection tank is communicated with the water discharge pipe.

The pretreatment device for the landfill leachate membrane concentrated solution carries out catalytic oxidation reaction on the landfill leachate membrane concentrated solution, supernatant after precipitation separation flows back to a landfill leachate biochemical system, and sludge after precipitation is discharged to a factory sludge treatment system through a sludge discharge valve. The device can greatly eliminate pollutants such as membrane concentrate COD, total phosphorus and the like, avoid direct recharging of concentrate to landfill reservoir area, influence the leachate treatment system, ensure that the leachate effluent is stable up to standard and is discharged. The beneficial effects are as follows: the utility model can reduce the accumulation of pollutants in the reservoir area of the landfill site caused by the recharging of the landfill liquid film concentrate sewage, and influence the operation efficiency of the landfill leachate treatment system, thereby causing the phenomenon of exceeding the standard of the effluent of the landfill leachate treatment system.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model. In the drawings:

FIG. 1 is a schematic diagram of a pretreatment device for landfill leachate membrane concentrate;

in the figure, a pretreatment device box body 1, a water inlet pipe 2, a nanofiltration system 3, an acid regulating zone 1.1, an oxidation zone 1.2, an alkali regulating zone 1.3, a flocculation zone 1.4, a sedimentation zone 1.5, an inclined pipe filler 4, a water outlet tank 5, a mud bucket 6, a mud valve 7, a mud pipe 8, a water discharge pipe 9, a dilute sulfuric acid agent preparation device 10, an acid regulating and dosing pipe 11, a ferrous sulfate agent preparation device 12, an iron salt dosing pipe 13, a hydrogen peroxide agent preparation device 14, a hydrogen peroxide dosing pipe 15, a liquid alkali agent preparation device 16, a liquid alkali dosing pipe 17, a PAM dosing preparation device 18, a PAM dosing pipeline 19, an acid regulating and stirring device 20, an oxidation stirring device 21, an alkali regulating and stirring device 22 and a flocculation stirring device 23.

Detailed Description

The utility model will be described in detail below with reference to the drawings in combination with embodiments.

The pretreatment device for the landfill leachate membrane concentrated solution is shown in fig. 1, and is connected with a concentrated solution outlet of a nanofiltration system, and comprises a pretreatment device box body 1, wherein a water inlet pipe 2 is arranged on the upper wall of the pretreatment device box body 1, a water inlet of the water inlet pipe 2 is connected with a concentrated solution outlet of a nanofiltration system 3, a separation plate is vertically arranged in the pretreatment device box body 1, and the separation plate divides the pretreatment device box body into an acid regulating zone 1.1, an oxidation zone 1.2, a alkali regulating zone 1.3, a flocculation zone 1.4 and a sedimentation zone 1.5 which are sequentially arranged along the process flow; the acid regulating area 1.1 is positioned on the water inlet side of the pretreatment device box body 1, and the sedimentation area 1.5 is positioned on the water outlet side of the pretreatment device box body 1; the acid regulating area 1.1 is matched with a dilute sulfuric acid medicament preparation device 10, a ferrous sulfate medicament preparation device 12, the oxidation area 1.2 is matched with a hydrogen peroxide medicament preparation device 14, the alkali regulating area 1.3 is matched with a liquid alkali medicament preparation device 16, the flocculation area 1.4 is matched with a PAM dosing preparation device 18, the sedimentation area 1.5 is positioned on the water outlet side of the pretreatment device box body 1, and the side wall is provided with a drain pipe 9; the bottom of the sedimentation zone 1.5 is provided with a plurality of mud hoppers 6, inclined pipe fillers 4 and water collecting tanks 5 in turn, and the water collecting tanks 5 are communicated with a drain pipe 9.

In order to improve the efficiency, the acid regulating area 1.1 is matched with an acid stirring device 20, an acid regulating and dosing pipe 11 communicated with the dilute sulfuric acid medicament preparation device 10 and an iron salt dosing pipe 13 communicated with the ferrous sulfate medicament preparation device 12; the oxidation zone 1.2 is matched with an oxidation stirring device 21 and a hydrogen peroxide dosing tube 15 communicated with a hydrogen peroxide medicament preparation device 14; the alkali adjusting area 1.3 is matched with an alkali adjusting stirring device 22 and a liquid alkali dosing tube 17 communicated with the liquid alkali medicament preparation device 16; the flocculation area 1.4 is matched with a flocculation stirring device 23 and a PAM dosing pipeline 19 communicated with the PAM dosing configuration device 18.

In addition, the first partition plate between the acid regulating area 1.1 and the oxidation area 1.2 and the partition plate between the alkali regulating area 1.3 and the flocculation area 1.4 do not touch the bottom of the pretreatment device box body; and overflow ports are arranged above the partition plates between the oxidation zone 1.2 and the alkali regulating zone 1.3 and the partition plates between the flocculation zone 1.4 and the sedimentation zone 1.5. The level of the inlet pipe 2 is lower than the level of the outlet pipe 9.

In the embodiment, the bottom of each mud bucket 6 is correspondingly provided with a mud pipe 8 with a mud valve 7. Each pipeline is provided with a valve.

The specific technical process of the pretreatment device for the landfill leachate membrane concentrate is as follows:

the membrane concentrated solution of the nanofiltration system 3 firstly enters an acid regulating area 1.1 of a pretreatment device box body 1, a dilute sulfuric acid agent is added into the acid regulating area 1.1 through a dilute sulfuric acid dosing configuration device 10 and an acid regulating dosing pipe 11, and the pH value of the concentrated solution is regulated to 2-4 through mixing by an acid regulating stirring device 20; meanwhile, ferrous sulfate medicament is added to the acid regulating area 1.1 for waiting reaction through the ferrous sulfate medicament adding and preparing device 12 and the ferric salt medicament adding pipe 13. Then the effluent enters an oxidation zone 1.2, a hydrogen peroxide agent is added into the oxidation zone 1.2 through a hydrogen peroxide dosing configuration device 14 and a hydrogen peroxide dosing pipe 15, and the hydrogen peroxide reacts with ferrous ions through an oxidation stirring device 21 to generate hydroxyl free radicals (OH) with strengthening capability, so that the organic matters which are difficult to decompose in the landfill leachate membrane concentrate are oxidized and decomposed. Then the effluent enters an alkali adjusting area 1.3, liquid alkali agent is added into the alkali adjusting area 1.3 through a liquid alkali dosing configuration device 16 and a liquid alkali dosing pipe 17, and the pH value of the concentrated solution is adjusted to 9-10 through neutralization reaction of an alkali adjusting stirring device 22. And then the effluent enters a flocculation area 1.4, PAM flocculation medicament is added into the flocculation area 1.4 through a PAM dosing configuration device 18 and a PAM dosing pipe 19, and larger flocculating constituent easy to precipitate is formed through the mixing reaction of a flocculation stirring device 23. The floccule enters a settling zone 1.5, is settled and separated through a pipe chute filler 4, the separated supernatant is collected through a water collecting tank 5 and then flows back to a percolate biochemical system through a drain pipe 9, and sludge is settled into a sludge bucket 6 and is discharged to a factory sludge dewatering system for treatment through a sludge discharge valve 7 and a sludge discharge pipe 8.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims.

Claims

1. A preprocessing device for landfill leachate membrane concentrate, it is connected its characterized in that with the concentrate outlet of nanofiltration system: the pretreatment device comprises a pretreatment device box body, wherein a water inlet pipe is arranged on the side wall of the pretreatment device box body, a water inlet of the water inlet pipe is connected with a concentrated solution water outlet of a nanofiltration system, and a separation plate is vertically arranged in the pretreatment device box body and divides the pretreatment device box body into an acid adjusting area, an oxidation area, an alkali adjusting area, a flocculation area and a sedimentation area which are sequentially arranged along the process flow; the acid regulating area is matched with a dilute sulfuric acid agent preparation device and a ferrous sulfate agent preparation device, the oxidation area is matched with a hydrogen peroxide agent preparation device, the alkali regulating area is matched with a liquid alkali agent preparation device, the flocculation area is matched with a PAM dosing preparation device, the sedimentation area is positioned on the water outlet side of the pretreatment device box body, and a drain pipe is arranged on the side wall; the bottom of the sedimentation zone is provided with a plurality of mud hoppers, inclined pipe fillers and water collecting tanks in turn.

2. The pretreatment device for a landfill leachate membrane concentrate according to claim 1, wherein: and stirring devices are arranged in the acid regulating area, the oxidation area, the alkali regulating area and the flocculation area.

3. The pretreatment device for a landfill leachate membrane concentrate according to claim 1, wherein: the partition plate between the acid regulating area and the oxidation area and the partition plate between the alkali regulating area and the flocculation area are not contacted with the bottom of the pretreatment device box body; and overflow ports are arranged above the partition plates between the oxidation zone and the alkali regulating zone and between the flocculation zone and the sedimentation zone.

4. The pretreatment device for a landfill leachate membrane concentrate according to claim 1, wherein: the bottom of each mud bucket is correspondingly provided with a mud pipe with a mud valve.

5. The pretreatment device for a landfill leachate membrane concentrate according to claim 1, wherein the water inlet pipe has a lower level than the water outlet pipe.

6. The pretreatment device for a landfill leachate membrane concentrate of claim 1, wherein the water collection sump is in communication with the drain pipe.