CN112707589A

CN112707589A - High-temperature anaerobic resourceful treatment system for kitchen waste leachate

Info

Publication number: CN112707589A
Application number: CN202011508239.1A
Authority: CN
Inventors: 李季; 吴凌彦; 籍延宝
Original assignee: Zhongnong Xinke Suzhou Organic Cycle Research Institute Co ltd
Current assignee: Zhongnong Xinke Suzhou Organic Cycle Research Institute Co ltd
Priority date: 2020-12-18
Filing date: 2020-12-18
Publication date: 2021-04-27

Abstract

The invention discloses a high-temperature anaerobic resourceful treatment system for kitchen waste leachate, which comprises an oil separation adjusting tank, a TABR anaerobic fermentation tank, an effluent collecting tank, a liquid fertilizer production system, a floating oil treatment system and an organic fertilizer system, wherein the oil separation adjusting tank is connected with the TABR anaerobic fermentation tank; leachate formed by the kitchen waste enters an oil removal regulating tank for oil removal treatment, floating oil enters a floating oil treatment system, and solid matters enter an organic fertilizer system; the leachate enters a TABR anaerobic fermentation tank for anaerobic reaction, the liquid enters an effluent collecting tank and then enters a liquid fertilizer production system for concentration to different degrees and compounding with other nutrient elements and trace elements to produce liquid fertilizers with different purposes and different types; and the solid part enters an organic fertilizer system, and the solid part enters a liquid fertilizer production system, so that the solid content in the liquid fertilizer is ensured and adjusted. The system improves the utilization degree of the kitchen leachate resource treatment, shortens the treatment time, reduces the treatment technical cost, improves the added value and further improves the organic load of the anaerobic digestion reaction.

Description

High-temperature anaerobic resourceful treatment system for kitchen waste leachate

Technical Field

The invention relates to the technical field of organic waste recycling treatment, in particular to a high-temperature anaerobic recycling treatment system for kitchen waste leachate.

Background

The kitchen waste leachate is complex in component, high in concentration of organic matters, inorganic salts and ammonia nitrogen and rich in various trace elements, is high-concentration organic wastewater difficult to degrade, is provided by comprehensively considering the actual conditions and economic and technical requirements of each treatment structure mostly according to a municipal sewage treatment method in the conventional treatment process, and is not developed into a mature treatment process suitable for the garbage leachate with various properties at present.

The main treatment method of the kitchen waste leachate comprises physical and chemical methods, such as dry and wet air oxidation, stripping, chemical oxidation reduction and the like, has good removal effect on chromaticity, COD (chemical oxygen demand), oil substances and ammonia nitrogen in the leachate, but has large energy consumption and high cost; in the land treatment method, such as a recharging method, an artificial wetland method and the like, the percolate which is not subjected to stabilization treatment can damage the structure and the property of the soil and pollute underground water; the biological treatment method, such as aerobic and anaerobic biological treatment, has the advantages of low cost, high efficiency, no secondary pollution, better biodegradability, economy and practicability of biodegradation, but the microbial growth process is greatly influenced by the environment, and the system stability is poorer, so that the fluctuation of the effluent quality is large. At present, complex biotechnology and expensive membrane treatment technology are generally adopted in the kitchen waste leachate treatment process to treat the leachate to reach the standard and then discharge the leachate, so that the problems of long treatment time, complex process, high cost, low resource recovery rate and the like exist, even a plurality of places directly discharge the leachate into a sewer pipeline without treatment, the pollution load of a municipal sewage treatment plant is greatly increased, the daily operation and maintenance of the sewage treatment plant are not difficult, and the environmental pressure and the economic loss are caused. Meanwhile, the kitchen waste leachate is not strictly treated, so that the ecological environment is seriously polluted.

Disclosure of Invention

The purpose of the invention is as follows: in order to overcome the defects of the background art, the invention discloses a high-temperature anaerobic resource treatment system for kitchen waste leachate, which improves the utilization degree of the kitchen leachate resource treatment, shortens the treatment time, reduces the treatment cost and further improves the organic load of anaerobic digestion reaction.

The technical scheme is as follows: the high-temperature anaerobic recycling treatment system for the kitchen waste leachate comprises an oil separation adjusting tank, a TABR anaerobic fermentation tank, an effluent collecting tank, a liquid fertilizer production system, a floating oil treatment system and an organic fertilizer system;

the treatment process of the system comprises the following steps:

s1, enabling percolate formed by kitchen waste to enter an oil removal adjusting tank for oil removal treatment, enabling floating oil to enter a floating oil treatment system for crude oil extraction and production of oil products, and enabling solid matters to enter an organic fertilizer system;

s2, allowing the percolate to enter a TABR anaerobic fermentation tank for anaerobic reaction, allowing the liquid to enter an effluent collecting tank and then enter a liquid fertilizer production system for concentration to different degrees and compounding with other nutrient elements and trace elements to produce liquid fertilizers with different purposes and different types; and the solid part enters an organic fertilizer system, and the solid part enters a liquid fertilizer production system, so that the solid content in the liquid fertilizer is ensured and adjusted.

Further, the oil separation adjusting tank comprises an oil separation tank body, the oil separation tank body is divided into an oil separation tank and an adjusting tank by an oil separation plate, and the oil separation tank and the adjusting tank are communicated through a first through hole formed in the oil separation plate; the other side of the oil separation tank, which is opposite to the oil separation plate, is provided with an oil separation water inlet, the oil separation tank is separated into a filtering area and an oil separation area by a filtering partition plate and is communicated with the filtering area through a second through hole, the upper part of the filtering area is provided with a screen, the lower part of the filtering area is provided with a first slag discharge port, the oil separation water inlet is positioned above the screen, the upper part of the oil separation area is provided with an oil discharge port, the lower part of the oil separation area is provided with a second slag discharge port, and percolate enters the regulating tank through the oil separation water inlet and sequentially passes through the screen;

and a first multi-parameter detector is arranged in the regulating tank, and a feed inlet and an oil separation water outlet are arranged.

Furthermore, the second through hole is located below the screen mesh and extends downwards through the baffle plate to form a downward opening.

Furthermore, a plurality of partition plates are longitudinally arranged in the middle of the oil separation area at intervals, and the oil discharge port is positioned above the partition plates.

Furthermore, a stirring device is arranged in the adjusting tank.

Further, the TABR anaerobic fermentation tank comprises a fermentation tank body, a reaction area is formed in the fermentation tank body by connecting a plurality of reaction chambers in series, and a fermentation water inlet and a fermentation water outlet are respectively formed in the head reaction chamber and the tail reaction chamber to realize liquid circulation; each reaction cavity consists of a baffle plate extending upwards and downwards and a chamber partition plate extending upwards and downwards, the baffle plate divides the reaction cavity into an upstream area and a downstream area, an elastic carrier filling area for culturing microorganisms and a second multi-parameter detector are arranged in each reaction cavity, and after entering from a fermentation water inlet, liquid flows from the downstream area to the upstream area and passes through the elastic carrier filling area.

Furthermore, the bottom of the partition plate of the inner cavity of each reaction cavity is provided with a flow guide inclined plate, and the upper part and the lower part of each reaction cavity are provided with sampling holes.

Furthermore, at least two elastic carrier filling areas are arranged in the reaction cavity at intervals.

Furthermore, the top of the TABR anaerobic fermentation tank is provided with a gas collecting hood which is communicated with the top of each reaction cavity and is provided with an exhaust port.

Further, a constant-temperature oil bath layer is arranged on the outer wall of the TABR anaerobic fermentation tank to maintain the temperature environment of the fermentation tank.

Has the advantages that: compared with the prior art, the invention has the advantages that:

(1) the utilization degree of the kitchen leachate resource treatment is improved, the treatment time is shortened, the treatment technology cost is reduced, the added value is improved, and the organic load of the anaerobic digestion reaction is further improved;

(2) the oil separation adjusting tank realizes rapid oil-water separation and the adjustment of parameters such as pH and the like so that the oil-water separation adjusting tank is quickly adapted to meet the requirement of microbial degradation and utilization after entering the high-temperature anaerobic reactor;

(3) HRT (hydraulic retention time) is short, TABR (thermo anaerobic digestion) effectively reduces hydraulic retention time, so that the aim of stable water outlet can be quickly achieved, pathogenic bacteria, roundworm eggs and the like can be effectively killed, and the risk of pathogenic bacteria pollution is effectively reduced for subsequent liquid fertilizer production;

(4) by arranging a plurality of elastic carrier materials in each reaction compartment of the TABR, the contact area between the microorganisms and the percolate can be further effectively increased, the degradation of high-concentration wastewater is ensured, and the degradation efficiency is accelerated;

(5) the effluent is rich in organic matters, nutrient elements, trace elements and the like required by various liquid fertilizers, the nutrient substances of the liquid fertilizers are comprehensive, the crops grow more uniformly after being applied, and the stress resistance and disease resistance are obviously improved; the liquid fertilizer production device can produce multifunctional fertilizer according to the application and has the characteristic of high added value;

(6) the solid can enter an organic fertilizer system for further utilization, and part of the solid can enter a liquid fertilizer production device for adjusting the content of insoluble substances in the liquid fertilizer;

(7) the investment and operation cost is low, and the investment is reduced by at least 30 percent compared with the investment of the same-scale membrane process;

(8) the whole process realizes the maximum utilization of waste water and waste residues, and the average resource utilization rate (kitchen waste leachate and solid matters (biogas residues, sludge and the like)) exceeds 60 percent.

Drawings

FIG. 1 is a schematic diagram of the system of the present invention;

FIG. 2 is a schematic view of the structure of an oil separation regulating tank of the present invention;

FIG. 3 is a schematic view of the structure of the TABR anaerobic fermentation tank of the present invention.

Detailed Description

The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.

The high-temperature anaerobic resourceful treatment system for the kitchen waste leachate shown in fig. 1 comprises an oil separation adjusting tank 1, a TABR anaerobic fermentation tank 2, an effluent collecting tank 3, a liquid fertilizer production system 4, a floating oil treatment system 5 and an organic fertilizer system 6; the method comprises the following steps that (1) leachate formed by cleaning, crushing and extruding kitchen waste before treatment firstly enters an oil separation adjusting tank 1 for oil separation treatment, floating oil enters a floating oil treatment system 5 for crude oil extraction and production of oil products, and solid matters enter an organic fertilizer system 6 for aerobic fermentation; the leachate enters a TABR anaerobic fermentation tank 2 for anaerobic reaction, and the liquid enters an effluent collecting tank 3 and then enters a liquid fertilizer production system 4 for concentration in different degrees and compounding with other nutrient elements and trace elements to produce liquid fertilizers with different purposes and different types; the solid part enters an organic fertilizer system 6, and the solid part enters a liquid fertilizer production system 4, so that the solid content in the liquid fertilizer is ensured and adjusted.

As shown in fig. 2, the oil separation regulation tank 1 includes an oil separation tank body, which is separated into an oil separation tank 102 and a regulation tank 103 by an oil separation plate 101, and is communicated with each other by a first through hole 104 formed in the oil separation plate 101; an oil separation water inlet 105 is formed in the other side, opposite to the oil separation plate 101, of the oil separation tank 102, the oil separation tank 102 is separated into a filtering area 107 and an oil separation area 108 by a filtering partition plate 106 and is communicated with the filtering area through a second through hole 109, a screen 110, preferably a 4-mesh screen, is arranged at the upper part of the filtering area 107 to intercept solid matters (residues) with larger diameters in percolate, a first residue discharge port 111 is formed at the lower part of the filtering area, the oil separation water inlet 105 is positioned above the screen 110, an oil discharge port 112 is formed at the upper part of the oil separation area 108, a second residue discharge port 113 is formed at the lower part of the oil separation area, and the percolate enters from the oil separation water inlet 105 and sequentially passes through the screen 110, the second through hole;

the effective volume ratio of the regulating reservoir 103 to the oil separation reservoir 102 is 5: 1, be equipped with first multi-parameter detector 114 in the equalizing basin 103 to be equipped with charge door 115, agitating unit 119 and oil removal delivery port 116, index real-time supervision such as temperature, pH, COD, TN, SS in the infiltration liquid in the equalizing basin 103 is carried out to first multi-parameter detector 114, when pH value, C/N ratio appear unusually in the equalizing basin, mainly be low, in time throw sodium bicarbonate adjustment basicity, sodium acetate or methyl alcohol adjustment carbon source into the storehouse through charge door 115, when SS is unusual, add a quantitative bioflocculant, fully mix under agitating unit 119's effect, make oil removal delivery port 116 get into TABR anaerobic fermentation tank 2 in reduce microorganism adaptation time as far as possible, accelerate microbial degradation efficiency.

The second through hole 109 is located below the screen 110, and extends downward by disposing a baffle 117 to form a downward opening. So that the liquid is deposited at the bottom of the filtering area 107 and then enters the oil separating area 108.

A plurality of partition plates 118 are longitudinally arranged in the middle of the oil separating area 108 at intervals, and the oil outlet 112 is positioned above the partition plates 118. On one hand, the water flow speed is reduced, so that suspended substances in the inlet water are settled after impacting the partition plate and are discharged through the slag discharge port; on the other hand, the oil separation effect is achieved, the floating oil and the water in the water inlet are separated due to the gravity, the floating oil rises, the water flow goes downwards, the oil separation effect is achieved in the process, the water outlet of the first through hole 104 becomes clear, and the water outlet does not contain the floating oil basically.

As shown in fig. 3, the TABR anaerobic fermentation tank 2 includes a fermentation tank body, a plurality of reaction chambers 201 are connected in series to form a reaction area, in this embodiment, 6 reaction chambers are connected in series, and a fermentation water inlet 202 and a fermentation water outlet 203 are respectively formed in the head reaction chamber and the tail reaction chamber to realize liquid circulation; each reaction cavity 201 is composed of a baffle plate 204 extending from top to bottom and a chamber partition plate 205 extending from bottom to top, the baffle plate 204 divides the reaction cavity 201 into an upstream area and a downstream area, each reaction cavity 201 is internally provided with an elastic carrier filling area 206 for culturing microorganisms and a second multi-parameter detector 207 (for measuring the indexes of temperature, pH, COD, TN and the like in the reactor), and after entering from the fermentation water inlet 202, liquid flows from the downstream area of each reaction cavity 201 to the upstream area and passes through the elastic carrier filling area 206.

The bottom of the chamber partition 205 in each reaction cavity 201 is provided with a diversion inclined plate 212, so as to prevent an anaerobic dead water zone from occurring in the water flow process, and increase the circulation fluidity of water. Sampling holes 208 are formed in the upper portion and the lower portion of each reaction cavity 201 and used for further monitoring the activity of water and microorganisms in the reaction cavities.

At least two elastic carrier filler regions 206 are arranged in the reaction cavity 201 at intervals, and liquid sequentially passes through the two elastic carrier filler regions 206 in each reaction cavity 201, so that the microbial degradation efficiency is further increased, and the flow of sludge can be effectively blocked.

The top of the TABR anaerobic fermentation tank 2 is provided with a gas collecting hood 209 communicated with the top of each reaction cavity 201 and an exhaust port 210, so that the direct discharge of gas is prevented from causing pollution.

The outer wall of the TABR anaerobic fermentation tank 2 is provided with a constant temperature oil bath layer 211, so that the temperature environment of the fermentation tank is maintained, and the temperature in the reaction cavity is kept between 50 and 55 ℃.

Macromolecular organic substances in the kitchen waste leachate are continuously degraded into micromolecular organic substances which are easy to absorb by plants in the TABR anaerobic fermentation tank 2 by microorganisms through the water inlet of the fermentation water inlet 202, and sludge (biogas residues) deposited in the reactor is taken out and sent into the organic fertilizer system 6 along with the reaction; effluent passing through the TABR anaerobic fermentation tank 2 (rich in various micromolecular organic substances and trace elements) enters an effluent collecting tank 3 and is stored in a shading mode (algae growth is prevented). The liquid fertilizer production system 4 mainly carries out concentration to different degrees aiming at the effluent in the effluent collecting tank 3 and compounds other nutrient elements and trace elements to produce liquid fertilizers with different purposes and different types, and in addition, part of solid matters (biogas residues) discharged from the TABR anaerobic fermentation tank 2 enter the liquid fertilizer production system to ensure the solid content in the liquid fertilizer.

The following are the water inlet and equipment setting values of each kitchen waste leachate:

TABLE 1 Water quality index of kitchen garbage leachate (influent)

Index of regulating pool of watch two

Index (I)	Numerical value
		pH	6.5～8.5
C:N:P	200～300:5:1
		COD(mg/L)	≤50000

Index of the three effluent collecting tanks (Standard for agricultural biogas slurry and concentrated liquid fertilizer)

Claims

1. The utility model provides a kitchen garbage leachate high temperature anaerobism resourceful treatment system which characterized in that: comprises an oil separation adjusting tank (1), a TABR anaerobic fermentation tank (2), an effluent collecting tank (3), a liquid fertilizer production system (4), a floating oil treatment system (5) and an organic fertilizer system (6);

the treatment process of the system comprises the following steps:

s1, enabling percolate formed by kitchen waste to enter an oil removal adjusting tank (1) for oil removal treatment, enabling floating oil to enter a floating oil treatment system (5) for crude oil extraction and production of oil products, and enabling solid matters to enter an organic fertilizer system (6);

s2, enabling the percolate to enter a TABR anaerobic fermentation tank (2) for anaerobic reaction, enabling the liquid to enter an effluent collecting tank (3) and then enter a liquid fertilizer production system (4) for concentration in different degrees and compounding other nutrient elements and trace elements to produce liquid fertilizers with different purposes and different types; the solid part enters an organic fertilizer system (6), and the solid part enters a liquid fertilizer production system (4), so that the solid content in the liquid fertilizer is ensured and adjusted.

2. The high-temperature anaerobic resourceful treatment system for kitchen waste leachate according to claim 1, characterized in that: the oil separation adjusting tank (1) comprises an oil separation tank body, is separated into an oil separation tank (102) and an adjusting tank (103) by an oil separation plate (101), and is communicated through a first through hole (104) formed in the oil separation plate (101); an oil separation water inlet (105) is formed in the other side, opposite to the oil separation plate (101), of the oil separation tank (102), the oil separation tank (102) is separated into a filtering area (107) and an oil separation area (108) through a filtering partition plate (106), the filtering area (107) and the oil separation area (108) are communicated through a second through hole (109), a screen (110) is arranged at the upper part of the filtering area (107), a first slag discharge port (111) is formed in the lower part of the filtering area (107), the oil separation water inlet (105) is located above the screen (110), an oil discharge port (112) is formed in the upper part of the oil separation area (108), a second slag discharge port (113) is formed in the lower part of the oil separation area (108), and leachate enters the regulating tank (103) through the oil separation water inlet (105) and sequentially passes;

a first multi-parameter detector (114) is arranged in the adjusting tank (103), and a feed inlet (115) and an oil separation water outlet (116) are arranged.

3. The high-temperature anaerobic resourceful treatment system for kitchen waste leachate according to claim 2, characterized in that: the second through hole (109) is located below the screen (110), and extends downwards through the baffle (117) to form a downward opening.

4. The high-temperature anaerobic resourceful treatment system for kitchen waste leachate according to claim 2, characterized in that: a plurality of partition plates (118) are longitudinally distributed in the middle of the oil separating area (108) at intervals, and the oil drain port (112) is located above the partition plates (118).

5. The high-temperature anaerobic resourceful treatment system for kitchen waste leachate according to claim 2, characterized in that: and a stirring device (119) is arranged in the adjusting tank (103).

6. The high-temperature anaerobic resourceful treatment system for kitchen waste leachate according to claim 1, characterized in that: the TABR anaerobic fermentation tank (2) comprises a fermentation tank body, a reaction area is formed in the fermentation tank body by connecting a plurality of reaction chambers (201) in series, and a fermentation water inlet (202) and a fermentation water outlet (203) are respectively formed in the head reaction chamber and the tail reaction chamber to realize liquid circulation; each reaction cavity (201) is composed of a baffle plate (204) extending from top to bottom and a chamber partition plate (205) extending from top to bottom to top, the baffle plate (204) divides the reaction cavity (201) into an upstream area and a downstream area, an elastic carrier filling area (206) and a second multi-parameter detector (207) for culturing microorganisms are arranged in each reaction cavity (201), and after liquid enters from a fermentation water inlet (202), the liquid flows from the downstream area of each reaction cavity (201) to the upstream area and passes through the elastic carrier filling area (206).

7. The high-temperature anaerobic resourceful treatment system for kitchen waste leachate according to claim 6, characterized in that: the bottom of the chamber partition plate (205) in each reaction cavity (201) is provided with a flow guide sloping plate (212), and the upper part and the lower part of each reaction cavity (201) are provided with sampling holes (208).

8. The high-temperature anaerobic resourceful treatment system for kitchen waste leachate according to claim 6, characterized in that: at least two elastic carrier filling areas (206) are arranged in the reaction cavity (201) at intervals.

9. The high-temperature anaerobic resourceful treatment system for kitchen waste leachate according to claim 6, characterized in that: the top of the TABR anaerobic fermentation tank (2) is provided with a gas collecting hood (209) communicated with the top of each reaction cavity (201), and is provided with an exhaust port (210).

10. The high-temperature anaerobic resourceful treatment system for kitchen waste leachate according to claim 6, characterized in that: the outer wall of the TABR anaerobic fermentation tank (2) is provided with a constant temperature oil bath layer (211) to maintain the temperature environment of the fermentation tank.