CN107098473B - High-efficient microbial community integration denitrification device based on mineralized filler - Google Patents
High-efficient microbial community integration denitrification device based on mineralized filler Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a high-efficiency microbial community integrated denitrification device based on mineralized fillers. Comprises a reactor body filled with mineralized fillers, and a water inlet, a spongy water distribution layer, an aerobic zone, a liquid guide pipe, an anaerobic zone, a supporting layer and a water outlet are respectively arranged from top to bottom. The invention has the advantages that: 1) The mineralized filler with the surface rich in functional groups and microbial diversity is selected to construct a microbial community, the special physical and chemical properties of the mineralized filler are fully utilized, the function of functional microbes in the microbial community is fully exerted, and the efficient denitrification treatment of the wastewater is realized; 2) The selected mineralized filler is waste which is mineralized for many years and is buried in the environment, so that the waste is treated by the waste, and the biological denitrification cost is greatly reduced; 3) Compared with the traditional biological denitrification process, the microbial community has high activity and better biological denitrification efficiency; 4) The device can realize integrated denitrification, and the effluent quality directly reaches the standard and is discharged.
Description
Technical Field
The invention relates to the field of biological denitrification of wastewater, in particular to a high-efficiency microbial community integrated denitrification device based on mineralized fillers.
Background
According to the comprehensive planning of national water resources, in 6834 water functional areas defined in main rivers, lakes and reservoirs in China, 33% of pollutants in the water functional areas have chemical oxygen demand or ammonia nitrogen status quo entering river volume exceeding the pollutant-receiving capacity and being 4-5 times of the pollutant-receiving capacity, and part of rivers (sections) are even as high as 13 times. The discharge amount of ammonia nitrogen wastewater is large, the harm is serious, the source is wide, on the other hand, along with the acceleration of the urbanization process, the urban domestic garbage is increased day by day, the quantity of landfill sites is considerable, a large amount of landfill substances with stable properties, namely mineralized fillers, are generated, and the mineralized fillers have good chemical adsorption performance and rich and diverse microbial community structures, and have good effect on removing pollutants. The cheap and easily obtained environmental wastes are used as materials for treating the wastewater, so that the treatment cost is low, the mineralized garbage in the landfill can be recycled, the aim of treating waste by waste is fulfilled, and the wide development prospect is achieved.
Nitrification and denitrification are traditional biological denitrification techniques, but since most of the microorganisms involved in the nitrification reaction: both ammonia oxidizing bacteria and nitrite oxidizing bacteria are aerobic microorganisms, but most microorganisms participating in denitrification are anaerobic microorganisms, and the ammonia oxidizing bacteria and the nitrite oxidizing bacteria can not coexist in the same uniform oxygen supply reactor due to different oxygen demand. The design of the reactor realizes the change of oxygen concentration in space, integrates nitrification and denitrification, saves space and realizes clean denitrification.
Nitrification is a sequential reaction of ammonia being oxidized to nitrite by one type of bacteria and nitrite being oxidized to nitrate by another type of bacteria, wherein the enzyme catalyzing the conversion of ammonia to hydroxylamine is ammonia monooxygenase, the enzyme catalyzing the conversion of hydroxylamine to nitrite is hydroxylamine oxidoreductase and the enzyme catalyzing the conversion of nitrite to nitrate is called nitrite oxidoreductase.
The whole nitration reaction is as follows:
denitrification refers to the biological reaction of reducing nitrate and nitrite to nitrogen. From the microbiological point of view, denitrification is an anaerobic respiration process of denitrifying bacteria, nitrate is an electron acceptor, nitrogen is a metabolite, and an electron donor (usually organic matter) must be continuously obtained from the outside to complete the anaerobic respiration process.
The autotrophic denitrification process comprises the following steps:
5S+6KNO 3 +2H 2 O→K 2 SO 4 +3N 2 +4KHSO 4
the heterotrophic denitrification process comprises the following steps:
disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a high-efficiency microorganism flora integrated denitrification device based on mineralized fillers.
In order to achieve the technical purpose, the technical scheme of the invention is as follows:
a high-efficiency microbial community integrated denitrification device based on mineralized fillers comprises a reactor body, wherein the top of the reactor body is provided with a water inlet, the bottom of the reactor body is provided with a water outlet, and a water distribution layer, an aerobic zone, an anaerobic zone and a supporting layer are respectively arranged in the reactor body from top to bottom; the water distribution layer is filled with sponge, the aerobic zone and the anaerobic zone are filled with mineralized filler for constructing microbial colonies, a plurality of air guide tubes are arranged in the aerobic zone and are connected with an external air source, a plurality of air holes are uniformly distributed in the tube body of each air guide tube, a liquid guide tube is arranged at the junction of the aerobic zone and the anaerobic zone, a plurality of water holes are formed in the tube body of the liquid guide tube in a way of facing the aerobic zone, one end of the liquid guide tube extends out of the reactor body, and sand is filled in the bearing layer.
The mineralized filler is urban domestic garbage buried for 4-10 years, wherein the mineralized filler has the water content of 25-40%, the ash content of 50-65%, the pH value of 7.7-8.1, the organic matter content of 7-12%, the cation exchange capacity of 10-25mmol/100g, the porosity of 30-45%, the particle size of 0.5-2mm, and functional groups rich on the surface: hydroxyl, carboxyl and amino, and the abundance of the microorganisms is higher than 7 percent: sphingomonas, thermomomonas, and Hydrophaga.
The high-efficiency microbial community integrated denitrification device based on the mineralized filler is characterized in that the thickness of sponge arranged on the water distribution layer is 20-40mm, and the sponge mass index per square inch is 35-50.
The utility model provides a high-efficient microorganism fungus crowd integration denitrification facility based on mineralize mineralization filler, the aerobic zone in from the top down be equipped with three air ducts, the air duct sets up along the horizontal direction, and two liang are 60 crisscross, air duct one placed in the middle stretches out outside the reactor outer wall in order to be connected with external air supply, the breather pipe interconnect through a vertical setting between three air ducts.
The high-efficiency microbial community integrated denitrification device based on the mineralized filler is characterized in that an external air source comprises an air pump and a rotor flowmeter, and the air pump is connected to an air guide pipe through the rotor flowmeter.
The efficient microbial community integrated denitrification device based on the mineralized filler further comprises an aerobic zone filler sampling port, wherein the aerobic zone filler sampling port is arranged on the outer wall of the reactor and is positioned right opposite to the joint of the gas guide pipe and an external gas source.
The efficient microbial community integrated denitrification device based on the mineralized filler is characterized in that a reactor filler main body is divided into an upper half aerobic area and a lower half anaerobic area, and the height ratio of the upper half aerobic area to the lower half anaerobic area is (1.2-1.5): 1.
the efficient microbial community integrated denitrification device based on the mineralized filler is characterized in that the liquid guide pipe is intersected with the central axis of the reactor, an included angle of 10-30 degrees is formed between the liquid guide pipe and the horizontal plane, and a filter screen is wrapped at the position of the water hole.
According to the efficient microbial community integrated denitrification device based on the mineralized filler, quartz sand with the particle size of 4-8mm and the thickness of 60-100mm is filled in the supporting layer at the lower part of the reactor.
The invention has the advantages that: 1) The mineralized filler with the surface rich in functional groups and microbial diversity is selected to construct a microbial community, the special physical and chemical properties of the mineralized filler are fully utilized, the function of functional microbes in the microbial community is fully exerted, and the efficient denitrification treatment of the wastewater is realized; 2) The selected mineralized filler is waste which is mineralized for many years and is buried in the environment, so that the waste is treated by the waste, and the biological denitrification cost is greatly reduced; 3) Compared with the traditional biological denitrification process, the microbial community has high activity and better biological denitrification efficiency; 4) The device can realize integrated denitrification, and the effluent quality directly reaches the standard and is discharged; 5) The sponge is used as a water distribution layer to realize uniform water distribution, so that the phenomenon that part of the filler load is too high and the rest part of the filler does not participate in the reaction due to the short circuit of water flow is avoided; 6) Three gas-guide tubes which are arranged in the upper half part of the reactor and form an angle of 60 degrees with each other in pairs can realize uniform aeration, so that ammonia nitrogen is fully converted into nitrite nitrogen and nitrate nitrogen, and the conversion rate of the ammonia nitrogen is improved to the maximum extent.
The invention will be further explained with reference to the drawings.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of the airway tube of FIG. 1;
FIG. 3 is an infrared analysis of mineralized fillers;
FIG. 4 is a graph of mineralized filler microbial community structure analysis;
FIG. 5 is a graph showing the change in pH of the inlet and outlet water during the start-up of the reactor;
FIG. 6 is a graph showing the variation of the concentration of the water-in and water-out substrate and the product, and the variation of the removal rate of the contaminant during the start-up process of the reactor;
FIG. 7 is a diagram showing the change of the concentration of trinitrogen in the effluent of the aerobic zone during the start-up of the reactor;
FIG. 8 is a diagram showing the change of COD concentration of effluent water during the starting process of the reactor;
the device comprises a water inlet 1, a water layer 2, a sponge cloth water layer 3, an air guide pipe 4, a filler sampling port in an aerobic zone 5, an air inlet 6, a liquid guide pipe 7, a water outlet sampling port in the aerobic zone 8, a filler sampling port in an anaerobic zone 9, a quartz sand filtering supporting layer 10, a water outlet 11, a water inlet device 12, a peristaltic pump 13, an air pump 14, a rotor flow meter 15, an aerobic zone 16, an anaerobic zone 17 and a water outlet device.
Detailed Description
Referring to fig. 1, the reactor of the present embodiment includes a reactor body, a water inlet is disposed at the top of the reactor body, the water inlet is connected to a water inlet device through a peristaltic pump, a water outlet is disposed at the bottom of the reactor body, and a water distribution layer, an aerobic zone, an anaerobic zone and a support layer are disposed inside the reactor body from top to bottom; the water distribution layer intussuseption is filled with the sponge, and aerobic zone and anaerobic zone intussuseption are filled with the mineralize mineralization filler that is used for founding the microbial community, are equipped with many air ducts in the aerobic zone, and the air duct is connected with outside air supply, and evenly distributed has a plurality of gas pockets on the body of air duct, is equipped with a catheter in the juncture in aerobic zone and anaerobic zone, and it has a plurality of water holes to open towards the aerobic zone on the body of catheter, and the one end of catheter stretches out outside this body of reactor, and the bearing layer intussuseption is filled with husky material. The water outlet at the bottom is connected to a water outlet device.
Referring to fig. 3 and 4, the mineralized filler is urban domestic garbage buried for 4-10 years in the environment, wherein the water content is 25% -40%, the ash content is 50-65%, the pH value is 7.7-8.1, the organic matter content is 7% -12%, the cation exchange capacity is 10-25mmol/100g, the porosity is 30-45%, the particle size is 0.5-2mm, and the surface is rich in functional groups: hydroxyl, carboxyl and amino, and the abundance of the microorganisms is higher than 7 percent: sphingomonas, thermomomonas, hydrophaga.
The sponge arranged on the water distribution layer has a thickness of 20-40mm and a sponge quality index of 35-50 per square inch. From the top down is equipped with three air ducts in the aerobic zone, and the air duct sets up along the horizontal direction, and two liang are 60 crisscross, and one air duct placed in the middle stretches out outside the reactor outer wall in order to be connected with external air supply, connects each other through the breather pipe of a vertical setting between three air ducts. The external air source comprises an air pump and a rotor flow meter, and the air pump is connected to the air guide tube through the rotor flow meter. The aerobic zone filler sampling port is arranged on the outer wall of the reactor and is positioned right opposite to the joint of the gas guide pipe and an external gas source.
The reactor packing main body is divided into an upper half aerobic zone and a lower half anaerobic zone, and the height ratio of the upper half aerobic zone to the lower half anaerobic zone is (1.2-1.5): 1. the liquid guide pipe is crossed with the central axis of the reactor, forms an included angle of 10-30 degrees with the horizontal plane, and is wrapped with a filter screen at the position of the water hole. The supporting layer at the lower part of the reactor is filled with quartz sand with the particle size of 4-8mm and the thickness of 60-100 mm.
As shown in the attached figure 1, the main body of the device of the embodiment is cylindrical organic glass with the diameter of 100mm, and mainly comprises an aerobic nitrification area and an anaerobic denitrification area, wherein the height of the aerobic area is 180mm, the height of the anaerobic area is 120mm, and the aerobic area and the anaerobic denitrification area are separated by a catheter with the diameter of 10mm, the upper half part of the catheter is uniformly perforated and then wraps a filter screen. Referring to fig. 2, three air ducts which are two by two and form 60 degrees are arranged in the upper half aerobic zone, the middle air duct is communicated with the outside, and a rotameter and an air pump are connected to ensure uniform aeration. In addition, the aerobic zone and the anaerobic zone are respectively provided with a filler sampling port, so that the analysis of microbial community structures in different oxygen concentration areas and the analysis of the change of organic matter content in the filler are facilitated, the specific way and mechanism of biological denitrification can be conveniently found, and in addition, the idea is provided for solving the generation reason and the treatment method of the problem of filler blockage in the current engineering application. The wastewater to be treated enters from a water inlet at the top end of the reactor, uniformly enters the reactor through a water distribution layer under the action of gravity, flows out along a liquid guide pipe after a small part of the wastewater flows through an aerobic nitrification area aerated by an air pump, and flows out from a water outlet at the bottom of the reactor after a large part of the wastewater continuously flows through an anaerobic denitrification area not aerated, finally passes through a bearing filter layer.
Referring to fig. 5-8, the initial ammonia nitrogen concentration of the inlet water is 28mg/L, the ammonia nitrogen removal rate reaches 100% through the chemical adsorption effect, the ammonia nitrogen concentration of the outlet water gradually increases and the removal rate gradually decreases to 66% due to the saturation tendency of the chemical adsorption and the ion exchange, and the decrease of the pH value of the outlet water also indicates that the nitration reaction starts to play a role. In the growth stage of functional microorganisms, the ammonia nitrogen removal rate is gradually recovered, and simultaneously, the ammonia nitrogen concentration of inlet water is gradually increased to 50, 100 and 200mg/L, and the removal rate can reach more than 99 percent. In the subsequent process of increasing ammonia nitrogen load, 3.5g/L of sodium bicarbonate is added simultaneously, the effluent is changed into black brown from initial light yellow, the increase of alkalinity inhibits the growth of nitrobacteria, the nitrification is maintained in a nitrosation stage, the nitrite nitrogen in the effluent is suddenly increased to 30mg/L from within 0.1mg/L before, the pH of the effluent is increased to 7.5 from 6.5, meanwhile, the ammonia nitrogen removal rate is also reduced to 50%, after two days, the supplement of the sodium bicarbonate in the effluent is stopped, the original treatment effect of the reactor is restored immediately, and the ammonia nitrogen removal rate reaches 96%. This procedure demonstrates that the reactor has good impact resistance.
The method is characterized in that a high-efficiency microbial community integrated denitrification device based on mineralized filler is adopted, the mineralized filler is a filler obtained from anaerobic landfill of a certain landfill site in Jiangxi province for eight years, and the ammonia nitrogen in effluent can be basically maintained within 15mg/L through the integrated device, so that the primary discharge standard is reached; the COD of the effluent is basically maintained within 50mg/L, and the effluent reaches the first-level discharge standard.
Claims (6)
1. The efficient microbial community integrated denitrification device based on the mineralized filler is characterized by comprising a reactor body, wherein the top of the reactor body is provided with a water inlet, the bottom of the reactor body is provided with a water outlet, and a water distribution layer, an aerobic zone, an anaerobic zone and a supporting layer are respectively arranged in the reactor body from top to bottom; the water distribution layer is filled with sponge, the aerobic zone and the anaerobic zone are filled with mineralized filler for constructing microbial colonies, a plurality of air guide tubes are arranged in the aerobic zone and are connected with an external air source, a plurality of air holes are uniformly distributed on tube bodies of the air guide tubes, a liquid guide tube is arranged at the junction of the aerobic zone and the anaerobic zone, a plurality of water holes are formed in the tube bodies of the liquid guide tube and face the aerobic zone, one end of the liquid guide tube extends out of the reactor body, and the bearing layer is filled with sand; the thickness of the sponge arranged on the water distribution layer is 20-40mm, and the sponge quality index per square inch is 35-50; three air guide pipes are arranged in the aerobic zone from top to bottom, the air guide pipes are arranged along the horizontal direction and staggered in pairs at an angle of 60 degrees, one of the air guide pipes in the middle extends out of the outer wall of the reactor to be connected with an external air source, and the three air guide pipes are connected with each other through a vertically arranged air guide pipe;
the mineralized filler is urban domestic garbage buried for 4-10 years, wherein the water content is 25% -40%, the ash content is 50-65%, the pH value is 7.7-8.1, the organic matter content is 7% -12%, the cation exchange capacity is 10-25mmol/100g, the porosity is 30-45%, the particle size is 0.5-2mm, and the surface of the mineralized filler is rich in functional groups: hydroxyl, carboxyl and amino, and the abundance of the microorganisms is higher than 7 percent: sphingomonas, thermomomonas, hydrophaga.
2. The device of claim 1, wherein the external gas source comprises a gas pump and a rotameter, and the gas pump is connected to the gas-guide tube through the rotameter.
3. The device for the integrated denitrification of the microbial community based on the mineralized filler according to claim 1, further comprising an aerobic zone filler sampling port, wherein the aerobic zone filler sampling port is arranged on the outer wall of the reactor and is positioned right opposite to the joint of the gas guide pipe and an external gas source.
4. The device for the integrated denitrification of the high-efficiency microbial community based on the mineralized filler as claimed in claim 1, wherein the main body of the reactor filler is divided into an upper half aerobic zone and a lower half anaerobic zone, and the height ratio of the upper half aerobic zone to the lower half anaerobic zone is (1.2-1.5): 1.
5. the device for the integrated denitrification of the microbial community based on the mineralized filler as claimed in claim 1, wherein the liquid guide pipe is intersected with the central axis of the reactor, and forms an included angle of 10-30 degrees with the horizontal plane, and a filter screen is wrapped at the position of the water hole.
6. The device for the integrated denitrification of the microorganism flora based on the mineralized filler as claimed in claim 1, wherein the supporting layer at the lower part of the reactor is filled with quartz sand with the particle size of 4-8mm and the thickness of 60-100 mm.
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| CN109775928B (en) * | 2019-02-18 | 2022-01-18 | 江西盖亚环保科技有限公司 | Filler matrix for treating landfill leachate and preparation method and application thereof |
| CN110452846B (en) * | 2019-08-16 | 2022-07-12 | 鹭滨环保科技（上海）股份有限公司 | Paracoccus denitrificans and biological denitrification method by combining paracoccus denitrificans with mineralization bed |
| CN114230092A (en) * | 2021-12-10 | 2022-03-25 | 融碳科技(成都)有限公司 | Domestic sewage treatment system and method |
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| US6461510B1 (en) * | 1999-07-23 | 2002-10-08 | Tennessee Valley Authority | High-efficiency processes for destruction of contaminants |
| CN103466796A (en) * | 2013-09-27 | 2013-12-25 | 桂林理工大学 | Method for carrying out synchronous nitrification treatment and denitrification treatment on percolate by using mineralized refuse reaction bed |
| CN203451270U (en) * | 2013-07-15 | 2014-02-26 | 济南大学 | Continuous flow oxygen removal reactor for anaerobic ammonia oxidation inflow |
| CN104445613A (en) * | 2014-03-29 | 2015-03-25 | 湖南碧源环保工程建设有限公司 | Mineralized refuse packed bed and wastewater denitrification method |
| CN106379996A (en) * | 2016-11-07 | 2017-02-08 | 平潭盖亚环保科技有限公司 | Bio-filter used for treating wastewater |
| CN207142920U (en) * | 2017-06-30 | 2018-03-27 | 中南大学 | A kind of high-effective microorganism cenobium integration denitrification device based on mineralising filler |
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Patent Citations (6)
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| US6461510B1 (en) * | 1999-07-23 | 2002-10-08 | Tennessee Valley Authority | High-efficiency processes for destruction of contaminants |
| CN203451270U (en) * | 2013-07-15 | 2014-02-26 | 济南大学 | Continuous flow oxygen removal reactor for anaerobic ammonia oxidation inflow |
| CN103466796A (en) * | 2013-09-27 | 2013-12-25 | 桂林理工大学 | Method for carrying out synchronous nitrification treatment and denitrification treatment on percolate by using mineralized refuse reaction bed |
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