CN111186966A

CN111186966A - Leachate treatment device and process for garbage transfer station

Info

Publication number: CN111186966A
Application number: CN202010205448.2A
Authority: CN
Inventors: 陈益栓; 胡江琳; 马树坚; 林光煜; 刘祖盛
Original assignee: Guangdong Zhengcheng Environmental Technology Co ltd
Current assignee: Guangdong Zhengcheng Environmental Technology Co ltd
Priority date: 2020-03-23
Filing date: 2020-03-23
Publication date: 2020-05-22

Abstract

The invention provides a garbage transfer station leachate treatment device and a process, which belong to the technical field of sewage treatment, and comprise a dosing coagulation tank and an air floatation machine which are sequentially connected and form a circulation loop, wherein the dosing coagulation tank is also respectively connected with an adjusting tank and an iron-carbon micro-electrolysis tower, one side of the air floatation machine is provided with an air compressor, a dissolved air tank and a dissolved air pump, the air compressor, the dissolved air tank and the air floatation machine are sequentially connected, the dissolved air tank, the dissolved air pump and the air floatation machine are sequentially connected, and one side of the iron-carbon micro-electrolysis tower is provided with a biochemical treatment unit. The embodiment of the invention solves the problem that small water volume does not have proper treatment equipment, realizes miniaturization and large water volume, realizes splicing with large-scale equipment, is suitable for treating percolate of a garbage transfer station with any scale, can adopt a matched full-automatic control system and a corresponding sensor, automatically operates in the whole process, and has the advantages of low investment and operation cost, small occupied area and stable and reliable treatment effect.

Description

Leachate treatment device and process for garbage transfer station

Technical Field

The invention belongs to the technical field of sewage treatment, and particularly relates to a leachate treatment device and process for a garbage transfer station.

Background

Along with the development of economy and the promotion of urbanization process in China, the quantity of garbage is increased, garbage disposal sites are far away from urban areas, and garbage transportation modes are from direct transportation to uncompressed transportation and to current compressed transportation. The farther a refuse landfill is built, the more the refuse landfill is built, the more and more transfer stations are used for compressing and transferring the refuse, the more and more transfer stations are ideal, and the refuse transfer stations inevitably generate refuse leachate containing a large amount of pollutants, so that the peripheral environment is seriously polluted, not only the underground water, the surface water source and the soil are polluted, but also the survival of peripheral animals and plants is threatened, and the physical health of the masses of people is threatened. Therefore, landfill leachate must be effectively treated to minimize its environmental impact.

The traditional process generally adopts a biochemical treatment plus membrane treatment or a simple biochemical method process route, and although the treatment effect of the process is still good, the process has a plurality of disadvantages: larger occupied area, higher operating cost and higher process operation requirements, and the traditional landfill leachate treatment process can not meet the requirements. Particularly, the characteristics of the landfill leachate of the transfer station determine that the landfill leachate is not suitable for adopting a process route which occupies large space and has long treatment time. Therefore, a small and efficient treatment system must be developed to solve the problem of the leachate in the transfer station.

Disclosure of Invention

Aiming at the defects of the prior art, the technical problem to be solved by the embodiment of the invention is to provide a device and a process for treating leachate of a garbage transfer station, wherein the process and the device for treating the leachate of the garbage transfer station are independently developed by adopting a physical and chemical, biochemical and membrane filtration combined technology, not only integrates the advantages of high concentration of physical and chemical treatment, but also integrates the advantages of stability and high efficiency of biochemical treatment, and also concentrates the membrane filtration principle, so that the device and the process can effectively solve the problem of organic wastewater such as the leachate of the garbage transfer station, which has high concentration, difficult degradation and high grease.

In order to solve the technical problems, the invention provides the following technical scheme:

a garbage transfer station leachate treatment device comprises a dosing coagulation tank and an air floatation machine which are sequentially connected and form a circulation loop, wherein the dosing coagulation tank is further respectively connected with an adjusting tank and an iron-carbon micro-electrolysis tower, one side of the air floatation machine is provided with an air compressor, a dissolved air tank and a dissolved air pump, the air compressor, the dissolved air tank and the air floatation machine are sequentially connected, the dissolved air tank, the dissolved air pump and the air floatation machine are sequentially connected, and one side of the iron-carbon micro-electrolysis tower is provided with a biochemical treatment unit;

the biochemical treatment unit comprises a first-stage AO biochemical system anoxic tank, a first-stage AO biochemical system aerobic tank, a second-stage AO biochemical system anoxic tank, a second-stage AO biochemical system aerobic tank, a clear water tank and a fan, wherein the first-stage AO biochemical system anoxic tank, the first-stage AO biochemical system aerobic tank, the second-stage AO biochemical system anoxic tank, the second-stage AO biochemical system aerobic tank and the fan are sequentially connected to form a circulation loop, the second-stage AO biochemical system aerobic tank is connected with the clear water tank, and a membrane assembly is arranged inside the second-stage AO biochemical system aerobic tank.

As a further improvement of the invention: and a slag scraping machine is arranged at the upper part of the air floatation machine.

The leachate treatment process for the garbage transfer station comprises the following steps:

(1) introducing the leachate of the garbage transfer station into a water quality adjusting tank, controlling the hydraulic retention time of the material to be more than or equal to 8 hours, completing water quality adjustment, then pumping the leachate into a dosing coagulation tank, and adding a flocculating agent to uniformly dose the leachate in the flocculation tank;

(2) introducing the material added with the flocculating agent into an air floatation machine for air floatation, removing scum formed by a large amount of organic matters such as grease, scum and solid suspended matters in the percolate through a scum scraper, and feeding supernatant into an iron-carbon micro-electrolysis tower after air floatation;

(3) the supernatant liquid introduced into the iron-carbon micro-electrolysis tower is processed by a metal corrosion principle method to form a galvanic cell, under the condition of no electricity, the micro-electrolysis material filled in the wastewater generates a 1.2V potential difference to carry out electrolysis treatment on the wastewater, and the water filtered by the iron-carbon micro-electrolysis tower enters a biochemical treatment unit;

(4) the water filtered by the iron-carbon micro-electrolysis tower enters a first-stage AO biochemical system anoxic tank for primary biological denitrification and denitrification, nitrate nitrogen in the wastewater is converted into nitrogen under the action of denitrifying bacteria and is removed from the water, then the nitrogen enters the first-stage AO biochemical system aerobic tank for aeration, the decomposition of organic pollutants and the nitrification of ammonia nitrogen are carried out, and the nitrified water is provided with a reflux device for refluxing the nitrified liquid to the front section of the first-stage AO biochemical system anoxic tank;

(5) the effluent of the aerobic tank of the first-level AO biochemical system enters the anoxic tank of the second-level AO biochemical system, and is subjected to biological denitrification and denitrification again, nitrate nitrogen in the wastewater is converted into nitrogen under the action of denitrifying bacteria, and is removed from the water, and then the effluent enters the aerobic tank of the second-level AO biochemical system, and organic pollutants are decomposed and nitrified in the aerobic tank of the second-level AO biochemical system;

(6) the membrane module is used for sucking water to the clean water tank through the self-priming pump under negative pressure, filtering water in the clean water tank is standard-reaching discharge water, overflowing the water to the drainage pipe network, performing water production discharge in an on-off alternative mode through the self-priming pump, setting back flushing, and performing regular back flushing by using water in the clean water tank to maintain membrane flux.

As a further improvement of the invention: and the membrane module is used for carrying out water production and discharge in a mode of starting for 8min and stopping for 2min through a self-priming pump.

As a further improvement of the invention: the hydraulic retention time of the control material is 60H.

As a still further improvement of the invention: the iron-carbon micro-electrolysis tower adopts corundum bottom-penetrating hard aeration.

As a still further improvement of the invention: the gas-water ratio of the iron-carbon micro-electrolysis tower is 3: 1, the filling rate of the filler is 60%, and the reaction time is 2 hours, and the iron-carbon micro-electrolysis tower is made of organic glass.

Compared with the prior art, the invention has the beneficial effects that:

the embodiment of the invention solves the problem that small water volume does not have proper treatment equipment, realizes miniaturization and large water volume, realizes splicing with large-scale equipment, is suitable for treating percolate of a garbage transfer station with any scale, can adopt a matched full-automatic control system and a corresponding sensor, automatically operates in the whole process, and has the advantages of low investment and operation cost, small occupied area and stable and reliable treatment effect.

Drawings

Fig. 1 is a schematic structural diagram of a leachate treatment apparatus of a garbage transfer station.

In the figure: 1-regulating tank, 2-dosing coagulation tank, 3-air compressor, 4-dissolved air tank, 5-dissolved air pump, 6-air floatation machine, 7-slag scraper, 8-iron-carbon micro-electrolysis tower, 9-blower, 10-first grade AO biochemical system anoxic tank, 11-first grade AO biochemical system aerobic tank, 12-second grade AO biochemical system anoxic tank, 13-second grade AO biochemical system aerobic tank, 14-membrane module and 15-clear water tank.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.

In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.

In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.

Example 1

Referring to fig. 1, the embodiment provides a leachate treatment apparatus for a garbage transfer station, including a dosing coagulation tank 2 and an air flotation machine 6 connected in sequence and forming a circulation loop, where the dosing coagulation tank 2 is further connected to an adjusting tank 1 and an iron-carbon micro-electrolysis tower 8, an air compressor 3, a dissolved air tank 4 and an air dissolving pump 5 are disposed on one side of the air flotation machine 6, the air compressor 3, the dissolved air tank 4 and the air flotation machine 6 are connected in sequence, the dissolved air tank 4, the dissolved air pump 5 and the air flotation machine 6 are connected in sequence, a biochemical treatment unit is disposed on one side of the iron-carbon micro-electrolysis tower 8, and specifically, the biochemical treatment unit includes a primary AO biochemical system anoxic tank 10, a primary AO biochemical system aerobic tank 11, a secondary AO biochemical system anoxic tank 12, a secondary AO biochemical system aerobic tank 13, a clear water tank 15 and a fan 9, and the primary AO biochemical system anoxic tank 10, the secondary, The primary AO biochemical system aerobic pool 11, the secondary AO biochemical system anoxic pool 12, the secondary AO biochemical system aerobic pool 13 and the fan 9 are sequentially connected to form a circulation loop, the secondary AO biochemical system aerobic pool 13 is connected with the clear water tank 15, and a membrane assembly 14 is arranged in the secondary AO biochemical system aerobic pool 13.

Leachate in the leachate collecting tank of the garbage transfer station is pumped into a dosing coagulation tank 2 through a lifting pump, leachate mixed with dosing is pumped into an air flotation machine 6 through the lifting pump, clear water after solid-liquid separation overflows into an iron-carbon micro-electrolysis tower 8 subsequently, the leachate after physical and chemical treatment sequentially enters a first-stage AO biochemical anoxic tank 10, a first-stage AO biochemical system aerobic tank 11, a second-stage AO biochemical system anoxic tank 12 and a second-stage AO biochemical system aerobic tank 13, and meanwhile, a membrane assembly 14 is installed inside the second-stage AO biochemical system aerobic tank 13, effluent after biochemical treatment is pumped and discharged to a device clear water tank 15 through a self-priming pump, and water of the clear water tank 15 is discharged up to the standard.

And a slag scraper 7 is arranged at the upper part of the air floatation machine 6.

A leachate treatment process based on the garbage transfer station comprises the following steps:

(1) introducing the leachate of the garbage transfer station into a water quality adjusting tank 1, controlling the hydraulic retention time of the material to be more than or equal to 8 hours, completing water quality adjustment, then pumping the leachate into a dosing coagulation tank 2, adding a flocculating agent, uniformly dosing in the flocculation tank, and facilitating the air floatation of the rear section;

(2) introducing the material added with the flocculating agent into an air floatation machine 6 for air floatation, wherein a large amount of organic matters such as grease, scum and solid suspended matters in the percolate are formed into scum which is removed by a scum scraping machine 7 by the air floatation principle, water distribution is forced, water inlet and outlet are static, adhesion of micro bubbles and flocs occurs in the whole air floatation separation process including a contact area, the scum is discharged instantly, water body disturbance is small, the effluent suspended matters are low, the slag discharging solid content is high, and supernatant after air floatation enters an iron-carbon micro-electrolysis tower 8;

(3) introducing the supernatant fluid of the air flotation into an iron-carbon micro-electrolysis tower 8, forming a galvanic cell to treat the wastewater by using a metal corrosion principle method, and electrolyzing the wastewater by using a 1.2V potential difference generated by a micro-electrolysis material filled in the wastewater under the condition of no power supply so as to achieve the purpose of degrading organic pollutants, wherein more than 50 percent of COD (chemical oxygen demand) can be removed, and the water filtered by the iron-carbon micro-electrolysis tower 8 enters a biochemical treatment unit;

(4) the water filtered by the iron-carbon micro-electrolysis tower 8 enters a first-stage AO biochemical system anoxic tank 10 for primary biological denitrification and denitrification, nitrate nitrogen in the wastewater is converted into nitrogen under the action of denitrifying bacteria and is removed from the water, then the nitrogen enters a first-stage AO biochemical system aerobic tank 11 for aeration, the decomposition of organic pollutants and the nitrification of ammonia nitrogen are carried out, and the nitrified water is provided with a reflux device for refluxing the nitrified liquid to the front section of the first-stage AO biochemical system anoxic tank 10;

(5) the effluent of the first-level AO biochemical system aerobic pool 11 enters a second-level AO biochemical system anoxic pool 12, biological denitrification and denitrification are carried out again, nitrate nitrogen in the wastewater is converted into nitrogen under the action of denitrifying bacteria, the nitrogen is removed from the water and then enters a second-level AO biochemical system aerobic pool 13, and decomposition and nitrification of organic pollutants are carried out in the second-level AO biochemical system aerobic pool 13;

(6) the membrane module 14 is used for sucking water to the clean water tank 15 through a self-priming pump under negative pressure, filtered water in the clean water tank 15 is standard-reaching discharge water, overflowing and discharging to a drainage pipe network, the membrane module 14 is used for performing water production discharge in an on-off alternative mode through the self-priming pump, backwashing is set, and the clean water tank 15 is used for performing periodic backwashing to maintain membrane flux.

Specifically, the membrane module 14 performs water production discharge in a mode of starting for 8min and stopping for 2min through a self-priming pump.

Specifically, the hydraulic retention time of the control material is 60H.

In the embodiment of the invention, a novel shallow air flotation principle is adopted, the surface water inlet is changed into dynamic water inlet, the dynamic water outlet is static water outlet, the zero speed principle is utilized, the flotation body vertically floats to the water surface in a relatively static environment, the floating distance is reduced to the minimum and is not influenced by the water outlet flow rate, the theoretical pool depth is only about 450mm, the detention time of sewage in air flotation is only 3-5 minutes, the equipment volume is greatly reduced, the added bubbles are uniformly distributed, no air flotation dead zone exists, the residue scraper 7 has the advantages of small disturbance to the water body and the like, the purification rate is greatly improved, the removal rate of suspended matters can reach over 90-99.5 percent, and the removal rate of COD can reach 65-90 percent.

Example 2

Referring to fig. 1, the embodiment of the invention is compared with embodiment 1, in the embodiment of the invention, corundum-through-bottom hard aeration is adopted in the iron-carbon micro-electrolysis tower 8, the gas-water ratio of the iron-carbon micro-electrolysis tower 8 is 3: 1, the filling rate of the filler is 60%, the reaction time is 2 hours, and organic glass is adopted as the iron-carbon micro-electrolysis tower body, so that later maintenance and operation can be more conveniently and intuitively carried out.

Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.

Claims

1. A leachate treatment device for a garbage transfer station comprises a dosing coagulation tank (2) and an air floatation machine (6) which are sequentially connected and form a circulation loop, wherein the dosing coagulation tank (2) is further respectively connected with an adjusting tank (1) and an iron-carbon micro-electrolysis tower (8), one side of the air floatation machine (6) is provided with an air compressor (3), a dissolved air tank (4) and an dissolved air pump (5), the air compressor (3), the dissolved air tank (4) and the air floatation machine (6) are sequentially connected, the dissolved air tank (4), the dissolved air pump (5) and the air floatation machine (6) are sequentially connected, and one side of the iron-carbon micro-electrolysis tower (8) is provided with a biochemical treatment unit;

the biochemical treatment unit comprises a primary AO biochemical system anoxic tank (10), a primary AO biochemical system aerobic tank (11), a secondary AO biochemical system anoxic tank (12), a secondary AO biochemical system aerobic tank (13), a clear water tank (15) and a fan (9), wherein the primary AO biochemical system anoxic tank (10), the primary AO biochemical system aerobic tank (11), the secondary AO biochemical system anoxic tank (12), the secondary AO biochemical system aerobic tank (13) and the fan (9) are sequentially connected to form a circulation loop, the secondary AO biochemical system aerobic tank (13) is connected with the clear water tank (15), and a membrane assembly (14) is arranged inside the secondary AO biochemical system aerobic tank (13).

2. The leachate treatment plant of the refuse transfer station according to claim 1, wherein a slag scraper (7) is disposed at the upper part of the air flotation machine (6).

3. The process for treating percolate from a refuse transfer station according to any one of claims 1 to 2, characterized by comprising the following steps:

(1) introducing the leachate of the garbage transfer station into a water quality adjusting tank (1), controlling the hydraulic retention time of the material to be more than or equal to 8 hours to finish water quality adjustment, then pumping the leachate into a dosing coagulation tank (2), and adding a flocculating agent to uniformly dose the leachate into the flocculation tank;

(2) introducing the material added with the flocculating agent into an air floatation machine (6) for air floatation, removing scum formed by a large amount of organic matters such as grease, scum and solid suspended matters in the percolate through a scum scraper (7), and feeding supernatant into an iron-carbon micro-electrolysis tower (8) after air floatation;

(3) the supernatant liquid introduced into the iron-carbon micro-electrolysis tower (8) is processed by a metal corrosion principle method to form a galvanic cell, under the condition of no electricity, the micro-electrolysis material filled in the wastewater generates a 1.2V potential difference to perform electrolysis treatment on the wastewater, and the water filtered by the iron-carbon micro-electrolysis tower (8) enters a biochemical treatment unit;

(4) the water filtered by the iron-carbon micro-electrolysis tower (8) enters a first-level AO biochemical system anoxic tank (10) for primary biological denitrification and denitrification, nitrate nitrogen in the wastewater is converted into nitrogen under the action of denitrifying bacteria and removed from the water, then the water enters a first-level AO biochemical system aerobic tank (11) for aeration to decompose organic pollutants and nitrify ammonia nitrogen, and the nitrified water is provided with a reflux device to reflux nitrified liquid to the front section of the first-level AO biochemical system anoxic tank (10);

(5) effluent of the first-level AO biochemical system aerobic pool (11) enters a second-level AO biochemical system anoxic pool (12) for biological denitrification and denitrification, nitrate nitrogen in wastewater is converted into nitrogen under the action of denitrifying bacteria and is removed from water, and then the effluent enters a second-level AO biochemical system aerobic pool (13) for decomposition and nitrification of organic pollutants in the second-level AO biochemical system aerobic pool (13);

(6) the membrane module (14) is used for sucking water to the clean water tank (15) through a self-sucking pump under negative pressure, filtered water in the clean water tank (15) is discharged to a drainage pipe network after overflowing, the membrane module (14) is used for producing water in an on-off alternative mode through the self-sucking pump and discharging, back washing is set, and regular back washing is carried out by using water in the clean water tank to maintain membrane flux.

4. The landfill leachate treatment process according to claim 3, wherein the membrane module (14) performs water production and discharge through a self-priming pump in a mode of 8min on and 2min off.

5. The process for treating leachate of a refuse transfer station according to claim 3, wherein the hydraulic retention time of the controlled material is 60H.

6. The process for treating leachate in a refuse transfer station according to claim 3, wherein the iron-carbon micro-electrolysis tower (8) is aerated by hard corundum-through-bottom aeration.

7. The process for treating the percolate from the garbage transfer station according to any one of claims 3 to 6, wherein the gas-water ratio of the iron-carbon micro-electrolysis tower (8) is 3: 1, the filling rate of the filler is 60%, and the reaction time is 2h, and the iron-carbon micro-electrolysis tower (8) is made of organic glass.