CN211570183U

CN211570183U - Landfill leachate treatment device

Info

Publication number: CN211570183U
Application number: CN201922035323.5U
Authority: CN
Inventors: 刘军; 高尚; 孙少龙; 刘彦奎; 宫建瑞
Original assignee: Nanjing Wondux Environmental Protection Technology Co ltd
Current assignee: Nanjing Wondux Environmental Protection Technology Co ltd
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2020-09-25
Anticipated expiration: 2029-11-22

Abstract

The utility model provides a garbage leachate treatment device, which comprises an MBR water outlet system, an NF system, an STRO system, an HPSTRO system, a material membrane system, a concentrated solution tank, a clean water tank and an incineration system; the NF system is connected with MBR water outlet, and a concentrated solution outlet and a clear solution outlet of the NF system are respectively connected with a material membrane system and an STRO system; a clear liquid outlet and a concentrated liquid outlet of the material membrane system are respectively connected with the STRO system and the concentrated liquid pool; a clear liquid outlet and a concentrated liquid outlet of the STRO system are respectively connected with a clear water tank and an HPSTRO system; a clear liquid outlet and a concentrated liquid outlet of the HPSTRO system are respectively connected with a clear water tank and a concentrated liquid tank; the concentrated solution pool is connected with the incineration system. The utility model discloses with the effectual combination use of STRO system and HPSTRO system, make landfill leachate final effluent reach GB/T19923-2005' emission standard, but the dense solution full quantization is handled.

Description

Landfill leachate treatment device

Technical Field

The utility model belongs to the technical field of landfill leachate handles, especially, relate to a landfill leachate treatment device.

Background

The landfill leachate has the characteristics of complex water quality components, high organic matter concentration, high ammonia nitrogen content, high salt content and the like, and the limited treatment of the landfill leachate is always a difficult point in the industry. The current domestic mainstream landfill leachate treatment technology is a process of 'pretreatment + biochemistry + advanced treatment'. Wherein the biochemical section realizes the effect of high-efficiency denitrification and COD reduction of the percolate by an MBR process. However, the COD and salt content in the MBR effluent are still high and cannot meet the standard of industrial recycling, so that the effluent needs to be subjected to advanced treatment. The common advanced treatment process is nanofiltration and reverse osmosis technology, but the common nanofiltration and reverse osmosis technology has low recovery rate of purified water, generally less than 75 percent, large concentrated solution amount, difficult treatment and increased cost.

Patent No. CN109205899A provides a method for treating landfill leachate by adopting a disc tube type reverse osmosis integrated technology, which comprises the steps of pretreatment, filtering, concentrating and filtering of filtered water entering two-stage DTRO, burning or immersion type burning, and miscellaneous salt treatment, but the method has the advantages of low clear water yield, high concentrated solution yield, easy pollution and blockage of a membrane, and complex operation. Simultaneously patent No. CN209128261U provides a landfill leachate handles zero discharge system, including the preliminary sedimentation tank that connects gradually, the equalizing basin, the hydrolytic acidification pond, the UASB reactor, the AO-MBR system, MBR membrane produces the water tank, the nanofiltration device, receive and strain fresh water product water tank, the electrodialysis system, the fresh water tank of electrodialysis and RO reverse osmosis unit, this system utilizes electrodialysis further desalination, but single process flow effluent rate is low, and dense liquid volume is big, can not handle completely, electrodialysis running cost is also higher.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a landfill leachate treatment device loops through NF system, STRO system with MBR biochemical system intaking and obtains the clear liquid retrieval and utilization. And (4) the concentrated solution of the NF system sequentially passes through the material membrane system and the STRO system to obtain clear solution for recycling. And (4) passing the STRO concentrated solution through an HPSTRO system to obtain clear solution for recycling. And concentrated solution obtained after the system operates is sequentially collected into a concentrated solution tank, and finally is treated by the incineration system, so that the purpose of full treatment of the garbage leachate is achieved. The specific technical scheme is as follows:

a landfill leachate treatment plant comprises an NF system, an STRO system, an HPSTRO system, a material membrane system, a concentrated solution tank, a clean water tank and an incineration system; the NF system is connected with MBR water outlet, and a concentrated solution outlet and a clear solution outlet of the NF system are respectively connected with a material membrane system and an STRO system; a clear liquid outlet and a concentrated liquid outlet of the material membrane system are respectively connected with the STRO system and the concentrated liquid pool; a clear liquid outlet and a concentrated liquid outlet of the STRO system are respectively connected with a clear water tank and an HPSTRO system; a clear liquid outlet and a concentrated liquid outlet of the HPSTRO system are respectively connected with a clear water tank and a concentrated liquid tank; the concentrated solution pool is connected with the incineration system.

Further, the material membrane system comprises a first-stage membrane, a first-stage second-stage membrane and a second-stage membrane; the liquid inlet of the first-stage membrane is connected with the concentrated liquid outlet of the NF unit, and the concentrated liquid outlet and the clear liquid outlet of the first-stage membrane are respectively connected with the first-stage second-stage membrane and the second-stage membrane; the concentrated solution outlet and the clear solution outlet of the first-stage second-stage membrane are respectively connected with the concentrated solution tank and the liquid inlet of the first-stage membrane; the concentrated solution outlet and the clear solution outlet of the secondary membrane are respectively connected with the concentrated solution tank and the STRO system.

Further, the first-stage membrane section comprises 2 membrane units connected in parallel, and each membrane unit comprises 6 membrane modules connected in series; the first-stage two-section membrane comprises 1 membrane unit, and each membrane unit comprises 6 membrane modules connected in series; the secondary membrane comprises 2 parallel membrane units, and each membrane unit comprises 5 series membrane modules.

Further, the NF system comprises 3 parallel membrane units, and each membrane unit comprises 6 series membrane modules.

Further, the STRO system comprises 3 membrane units in parallel and is operated in a 3: 3: 2 groups, each group comprises 5 series membrane modules.

Further, the HPSTRO system includes 2 parallel membrane units and is grouped in 4:4 groups, each group including 5 series membrane modules.

The utility model discloses following beneficial effect has:

(1) the introduced STRO and HPSTRO systems have good membrane separation performance and stable operation.

(2) The NF system, the material membrane system, the STRO system and the HPSTRO system are effectively combined for use, so that the final effluent of the landfill leachate reaches the discharge standard GB/T19923-2005.

(3) After the concentrated solution of the landfill leachate is subjected to reduction treatment by using a material membrane and an HPSTRO membrane system, the full treatment can be basically realized by an incineration system.

(4) The method is simple and easy to use, high in system integration level, easy to operate and wide in application prospect.

Drawings

FIG. 1 is a schematic view of a MBR effluent treatment system for landfill leachate provided by the present invention;

FIG. 2 is a schematic view of the MBR effluent treatment method for landfill leachate provided by the present invention;

FIG. 3 is a schematic view of a material membrane system;

FIG. 4 is a schematic diagram of a NF system;

FIG. 5 is a schematic diagram of a STRO system;

FIG. 6 is a schematic diagram of an HPSTRO system;

1-MBR biochemical system; 2-MBR water outlet tank; 3-NF systems; 4-NF clear liquid box; 5-NF concentrated liquid box; 6-STRO system; 7-a clean water tank; 8-a material membrane system; 9-concentrated liquid pool; 10-STRO concentrate tank; 11-HPSTRO system; 311-MBR biochemical system water inlet; 312-NF clear liquid; 313-NF concentrated solution; 611-NF clear solution/secondary clear solution; 612-STRO clear liquid; 613-STRO concentrated solution; 81-first stage membrane; 811-NF thick liquid; 812-first stage clear liquid; 813-first stage concentrated solution; 82-first-stage two-stage membrane; 821-first-stage second-stage clear liquid; 822-humic acid; 83-a secondary membrane; 831-secondary clear liquid; 832-secondary concentrated solution; 1111-STRO concentrated solution; 1112-HPSTRO clear liquid; 1113-HPSTRO concentrated solution.

Detailed Description

As shown in figure 1, effluent of an MBR biochemical system 1 enters an MBR water outlet tank 2, a water inlet of an NF system 3 is connected with the MBR water outlet tank 2, and generated NF concentrated solution and NF clear solution respectively enter an NF concentrated solution tank 5 and an NF clear solution tank 4. The NF clear liquid box 4 is connected with a water inlet of the STRO system 6, and STRO concentrated liquid and STRO clear liquid generated by the STRO system 6 respectively enter the STRO concentrated liquid box 10 and the clear water tank 7. The NF concentrated solution box 5 is connected with a material membrane system 8, and primary two-stage clear solution, secondary clear solution and secondary concentrated solution generated by the material membrane system 8 respectively enter the NF concentrated solution box 5, the NF clear solution box 4 and a concentrated solution pool 9. The STRO concentrated solution box 10 is connected with the HPSTRO unit, and the HPSTRO concentrated solution and the HPSTRO clear solution generated by the HPSTRO unit 11 respectively enter the concentrated solution tank 9 and the clear water tank 7.

The NF system in the step 1 comprises 3 parallel membrane units, wherein each membrane unit comprises 6 series membrane modules;

wherein, the first-stage membrane of the material membrane system in the step 2 comprises 2 membrane units which are connected in parallel, and each membrane unit comprises 6 membrane modules which are connected in series; the first-stage two-stage membrane of the material membrane system comprises 1 membrane unit, and each membrane unit comprises 6 membrane modules connected in series; the material membrane secondary membrane comprises 2 parallel membrane units, and each membrane unit comprises 5 series membrane modules.

Wherein, the STRO system in step 3 comprises 3 parallel membrane units and the ratio of the number of the membrane units is 3: 3: 2 groups are divided, and each group comprises 5 series membrane modules;

the HPSTRO system in the step 4 comprises 2 parallel membrane units which are grouped according to a ratio of 4:4, and each group comprises 5 series membrane modules.

The water treatment method based on the landfill leachate MBR effluent treatment system comprises the following steps:

step 1: the effluent of the MBR biochemical system is connected to an NF system for treatment to obtain NF clear liquid and NF concentrated liquid;

step 2: and (4) introducing the NF concentrated solution into a material membrane system, and respectively treating the NF concentrated solution by a two-stage material membrane. Firstly, the first-stage membrane treatment is carried out, the first-stage concentrated solution enters a first-stage second-stage membrane, humic acid and first-stage second-stage clear solution are obtained through separation, and the clear solution flows back to the first-stage membrane. The first-stage clear liquid enters a second-stage membrane, and a second-stage concentrated liquid and a second-stage clear liquid are obtained through separation;

and step 3: the NF clear liquid and the secondary clear liquid enter an STRO system, and are separated to obtain STRO clear liquid and STRO concentrated liquid;

and 4, step 4: allowing the STRO concentrated solution to enter an HPSTRO system, and separating to obtain an HPSTRO clear solution and an HPSTRO concentrated solution;

and 5: and (4) allowing the STRO clear liquid and the HPSTRO clear liquid to enter a clear water tank for recycling, and allowing the humic acid, the secondary concentrated solution and the HPSTRO concentrated solution to enter a concentrated solution tank for treatment through an incineration system.

The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments and application fields, and the above-described embodiments are only illustrative and instructive, and are not restrictive. Those skilled in the art, having the benefit of this disclosure, may effect numerous modifications thereto without departing from the scope of the invention as defined by the appended claims.

Claims

1. A landfill leachate treatment plant comprises an MBR biochemical system, and is characterized by comprising an NF system, an STRO system, an HPSTRO system, a material membrane system, a concentrated solution tank, a clean water tank and an incineration system; the NF system is connected with MBR water outlet, and a concentrated solution outlet and a clear solution outlet of the NF system are respectively connected with a material membrane system and an STRO system; a clear liquid outlet and a concentrated liquid outlet of the material membrane system are respectively connected with the STRO system and the concentrated liquid pool; a clear liquid outlet and a concentrated liquid outlet of the STRO system are respectively connected with a clear water tank and an HPSTRO system; a clear liquid outlet and a concentrated liquid outlet of the HPSTRO system are respectively connected with a clear water tank and a concentrated liquid tank; the concentrated solution pool is connected with the incineration system.

2. The landfill leachate treatment plant of claim 1, wherein the material membrane system comprises a primary first stage membrane, a primary second stage membrane and a secondary membrane; the liquid inlet of the first-stage membrane is connected with the concentrated liquid outlet of the NF unit, and the concentrated liquid outlet and the clear liquid outlet of the first-stage membrane are respectively connected with the first-stage second-stage membrane and the second-stage membrane; the concentrated solution outlet and the clear solution outlet of the first-stage second-stage membrane are respectively connected with the concentrated solution tank and the liquid inlet of the first-stage membrane; the concentrated solution outlet and the clear solution outlet of the secondary membrane are respectively connected with the concentrated solution tank and the STRO system.

3. The landfill leachate treatment plant of claim 2, wherein the primary section membrane comprises 2 membrane units connected in parallel, each membrane unit comprising 6 membrane modules connected in series; the first-stage two-section membrane comprises 1 membrane unit, and each membrane unit comprises 6 membrane modules connected in series; the secondary membrane comprises 2 parallel membrane units, and each membrane unit comprises 5 series membrane modules.

4. The landfill leachate treatment plant of claim 1, wherein the NF system comprises 3 membrane units connected in parallel, each membrane unit comprising 6 membrane modules connected in series.

5. The landfill leachate treatment plant of claim 1, wherein the STRO system comprises 3 membrane units in parallel and is operated in a 3: 3: 2 groups, each group comprises 5 series membrane modules.

6. The landfill leachate treatment plant of claim 1, wherein the HPSTRO system comprises 2 membrane units in parallel and grouped in 4:4, each group comprising 5 membrane modules in series.