CN218810866U - Underground water nitrate methane-oxidizing bacteria repair system - Google Patents
Underground water nitrate methane-oxidizing bacteria repair system Download PDFInfo
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Abstract
The utility model discloses an underground water nitrate methane oxidation bacteria remediation system, which comprises an aeration system and an underground water remediation system, wherein the aeration system comprises a methane storage tank, an air inlet pump, a flow meter and an aeration device which are sequentially connected together through an air inlet pipe; the groundwater remediation system is a permeable reactive barrier, the permeable reactive barrier is arranged on a groundwater flow path, and the permeable reactive barrier is composed of a water filtering layer I, a reactive layer and a water filtering layer II which are sequentially arranged along the flowing direction. The utility model effectively solves the problems that the underground water nitrate bioremediation method needs additional carbon source and aggravates water toxicity, and realizes the resource utilization of greenhouse gas methane; the method can effectively solve the problems of low efficiency, high operation cost, easy generation of secondary pollution and the like of the underground water nitrate physical and chemical remediation method, and the system has stable effluent quality and no secondary pollution.
Description
Technical Field
The utility model relates to an underground water nitrate methane oxidation fungus repair system belongs to groundwater processing technology field.
Background
Groundwater belongs to an important drinking water source, has the characteristic of slow cyclic renewal, is difficult to recover in a short time after being polluted, and nitrate pollution belongs to a type of groundwater pollution and is classified into point source pollution and surface source pollution. The point source pollution mainly comprises urban sewage, industrial sewage, domestic sewage, drainage of some metal mines and the like, and the non-point source pollution mainly comprises unreasonable irrigation of sewage, application of a large amount of nitrogen fertilizers, infiltration of landfill leachate and the like. Nitrate pollution in groundwater is increasingly serious, endangers the safety of aquatic organisms and threatens human health. The U.S. EPA mandates a maximum limit of 10mgNO 3 - N/L, allowable level of 5.6mgNO by the EU organization 3 - -N/L; the limit of nitrate in drinking water is 10mg/L, and the limit is 20mg/L when limited by the quality of underground water. Therefore, the development of efficient remediation techniques for groundwater nitrate pollution is imminent.
At present, the methods for restoring nitrate in underground water can be divided into physical methods, chemical methods and biological methods according to the reaction principle, and can also be divided into ex-situ restoration and in-situ restoration according to different treatment places. The physical methods mainly include an ion exchange resin method, an adsorption method, an electrodialysis method, and a reverse osmosis membrane method. The ion exchange resin method is to make NO in water 3 - The same-polarity ions on the anion exchanger are exchanged to achieve the denitrification effect; adsorption process using adsorbent and NO 3 - Removing nitrate in the water by Van der Waals force between ions; the electrodialysis method utilizes the selective permeability of ion exchange membrane to ions in solution to make anions and cations generate ion migration to remove NO 3 - (ii) a Reverse osmosis is a process in which NO is converted by pressure difference 3 - Separating from the solution. The chemical method mainly comprises a reducing agent reduction method, a catalytic reduction method and the common NO removal method 3 - The reducing agent of (b) is an active metal, formic acid, methanol, hydrogen, or the like. The biological method is to utilize microorganisms to promote denitrification in groundwater so as to convert nitrate nitrogen into nitrogen or organic nitrogen compounds to realize nitrogen removal, and can be divided into autotrophic denitrification and heterotrophic denitrification according to different types of electron donors, wherein the denitrification plays an important role in maintaining benign circulation of an ecosystem and eliminating nitrate pollution of groundwater. The biological method has the advantages of low consumption, high efficiency and no secondary pollution, and is widely applied to the fields of domestic sewage, industrial wastewater, groundwater remediation and the like.
The ectopic remediation is to pump polluted underground water out and treat the polluted water by surface treatment facilities and processes, and then collect the polluted water into a water supply pipeline or recharge the polluted water into the underground. The in-situ remediation is to treat the underground water before the underground water is pumped out of the ground surface, the technical carriers of the in-situ remediation are an in-situ reaction zone and a permeable reaction wall respectively, the in-situ reaction zone is to inject medicaments, microorganisms and the like into an aquifer by using an injection well, and one or more reaction zones are formed in the aquifer, so that the in-situ treatment in the aquifer space is realized; the permeable reactive barrier is arranged on the groundwater runoff path, and pollutants are treated or intercepted when passing through a reactive medium filled in the permeable reactive barrier.
However, the prior art for repairing nitrate in groundwater has limited application range and has certain defects, such as the need of using high-concentration salt or acid as resin regenerant in ion exchange resin method and easy generation of high-concentration wastewater(ii) a The adsorption material adopted by the adsorption method is limited by adsorption capacity, needs to be replaced or regenerated, and has NO in underground water 3 - The repair application increases the cost of operation and maintenance; the electrodialysis method and the reverse osmosis membrane method belong to the same membrane separation method, the membrane separation method has NO selectivity to ions, and NO is removed from water 3 - Meanwhile, other inorganic salts are removed, the efficiency is low, the cost is high, and the method is not suitable for large-scale groundwater nitrate pollution remediation; the chemical method can produce byproducts, which are easy to cause secondary pollution; heterotrophic denitrification is to apply heterotrophic denitrifying bacteria to the process of removing nitrate pollution of underground water, and organic matters are used as electron donors, but the shortage of organic carbon sources can cause the phenomena of nitrite increase and accumulation and the like, so that the toxicity of the underground water can be increased; the ectopic restoration is mainly used for point source pollution treatment, the disturbance of the extraction and recharge process to the site environment is large, and the regular maintenance and monitoring of the treatment system lead to the increase of the operation cost.
SUMMERY OF THE UTILITY MODEL
To the inefficiency that faces among current physical method, chemical method and the ectopic repair process, with high costs, easily produce secondary pollution and the big problem of environmental disturbance, the utility model provides a groundwater nitrate methane oxidation fungus repair system, this system have simple process, area is little, little to groundwater environment interference, construction and working costs are low, the treatment effeciency is high and energy consumption advantage such as little, this method utilizes methane as only carbon source, reduces the emission of methane when effectively getting rid of groundwater nitrate, realizes the utilization of methane as a resource, can effectively promote groundwater restoration and ecological environment protection.
The technical scheme of the utility model: the underground water nitrate methane oxidizing bacteria repairing system comprises an aeration system and an underground water repairing system, wherein the aeration system comprises a methane storage tank, an air inlet pump, a flow meter and an aeration device which are sequentially connected together through an air inlet pipe; groundwater repair system is permeable reactive wall, and permeable reactive wall sets up on secret rivers route, permeable reactive wall comprises drainage layer I, reaction layer and drainage layer II that set gradually along the direction of flowing through, drainage layer I and II inside packings of drainage layer have filler I, and the reaction layer is inside to be filled to have filler II, aeration equipment arranges groundwater repair system's reaction layer below, all is equipped with the water hole in drainage layer I, drainage layer II and reaction layer both sides.
Further, a sealing cover is installed at the top of the permeable reactive barrier.
Further, the aeration device is a microporous aeration pipe or a microporous aeration disc.
Further, the thickness of the water filtering layer I and the water filtering layer II is 1.5-3.5 m, round or square water passing holes are uniformly formed in the two sides of the water filtering layer I and the water filtering layer II, the opening rate is 20-45%, the hole diameter is 10-50 mm, and the filler I is gravel or pebble, and the particle size is 30-50 mm.
Further, the thickness of the reaction layer is 8-16 m, the filler II is quartz sand or volcanic rock, and the particle size is 10-20 mm.
Furthermore, the underground water remediation system is provided with 2-7 stages along an underground water flowing route, and the interval between each stage is 2-6 m.
Simultaneously, the utility model discloses still provide a groundwater nitrate methane-oxidizing bacteria repair method based on above-mentioned groundwater nitrate methane-oxidizing bacteria repair system, include following step:
the method comprises the following steps: firstly, adding methane-oxidizing bacteria serving as inoculated microorganisms into a reaction layer of an underground water remediation system, and then starting an aeration system to carry out microbial biofilm formation on the underground water remediation system for 3-5 days;
step two: after the microbial biofilm formation is finished, controlling the methane concentration by a flowmeter to enable the methane concentration to be 3% -5%;
step three: periodically detecting the ammonia nitrogen, total nitrogen and methane output of the effluent of each stage of underground water remediation system, and adjusting the aeration intensity and flow of the aeration system according to the actual condition;
step four: after the system is stable in operation, the growth condition of microorganisms on the surface of the filler in the underground water remediation system is observed, the forms of the microorganisms on the surface of the filler are analyzed, and the microbial population structure is analyzed by adopting 16SrRNA high-throughput sequencing, so that methane-oxidizing bacteria are enriched on the surface of the filler, organic matters can be generated by oxidizing methane by the methane-oxidizing bacteria, the generated organic matters are used as a carbon source required by denitrification by denitrifying bacteria, and nitrate nitrogen in tail water is converted into nitrogen, so that the purpose of nitrate denitrification is achieved.
In the method, the inoculation concentration of the methane-oxidizing bacteria is 0.05-0.8 mg dry mass/m 3 。
In the method, the aeration intensity of the aeration system is 1.0-4.0L/(min m) 2 )。
Since the technical scheme is used, the utility model has the advantages of:
(1) The problems that a carbon source needs to be additionally added and the water quality toxicity is aggravated in the groundwater nitrate bioremediation method are effectively solved, and the resource utilization of greenhouse gas methane is realized;
(2) The problems of low efficiency, high operation cost, easy generation of secondary pollution and the like of the underground water nitrate physical and chemical remediation method can be effectively solved, and the effluent quality of the system is stable and has no secondary pollution;
(3) The method can effectively solve the problem of large environmental disturbance of the underground water nitrate ex-situ remediation technology, is simple in system management and maintenance, low in operation cost and has important significance for ecological environment protection.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a graph showing the removal rates of nitrate nitrogen and total nitrogen in example one;
FIG. 3 is a graph showing the removal rates of nitrate nitrogen and total nitrogen in example two;
FIG. 4 is a graph showing the removal rates of nitrate nitrogen and total nitrogen in example III.
The labels in the figures are: 1-a methane storage tank, 2-an air inlet pump, 3-a gas flowmeter, 4-an air inlet pipe, 5-an aerator pipe, 6-a water filtering layer I, 7-a reaction layer, 8-a water filtering layer II, 9-a filler I, 10-a filler II and 11-a sealing cover.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described in detail with reference to the accompanying drawings and examples.
The first embodiment is as follows:
referring to fig. 1, the system for repairing underground water nitrate and methane oxidizing bacteria of the present invention comprises an aeration system and an underground water repairing system, wherein the aeration system comprises a methane storage tank 1, an air intake pump 2, a flow meter 3 and an aeration device 5 which are sequentially connected together through an air intake pipe 4; the underground water remediation system is a permeable reactive barrier, the permeable reactive barrier is arranged on an underground water flow path, and a sealing cover 11 is arranged at the top of the permeable reactive barrier; permeable reaction wall comprises drainage layer I6, reaction zone 7 and drainage layer II 8 that set gradually along the direction of flowing through, drainage layer I6 and the inside packing of drainage layer II 8 have I9 of filler, and the inside packing of reaction zone 7 has II 10 of filler, aeration equipment 5 arranges groundwater repair system's reaction zone 7 below, all is equipped with the water hole in drainage layer I6, drainage layer II 8 and reaction zone 7 both sides.
The aeration device 5 is a microporous aeration pipe; the thickness of the water filtering layer I6 and the water filtering layer II 8 is 1.5m, circular or square water passing holes are uniformly formed in the two sides of the water filtering layer, the opening rate is 20%, the hole diameter is 10mm, the filler I9 is gravel or pebble, and the particle size is 30mm; the thickness of the reaction layer 7 is 8m, the filler II 10 is quartz sand or vesuvianite, and the particle size is 10mm; the groundwater remediation system is provided with 3 stages along a groundwater flow path, each stage being 2m apart.
When the underground water nitrate methane oxidizing bacteria repairing system is adopted to repair underground water nitrate, the method comprises the following steps:
the method comprises the following steps: firstly, methane-oxidizing bacteria are added into a reaction layer 7 of an underground water remediation system as inoculated microorganisms, wherein the inoculation concentration of the methane-oxidizing bacteria is 0.05mg dry mass/m 3 Then starting an aeration system, wherein the aeration intensity of the aeration system is 1.0L/(min m) 2 ) Carrying out microbial biofilm formation on the underground water remediation system for 3 days;
step two: after the microbial biofilm formation is finished, controlling the methane concentration through a flowmeter 3 to enable the methane concentration to be 3%;
step three: periodically detecting the ammonia nitrogen, total nitrogen and methane output of the effluent of each stage of underground water remediation system, and adjusting the aeration intensity and flow of the aeration system according to the actual condition;
step four: after the system runs stably, the growth condition of microorganisms on the surface of the filler in the underground water remediation system is observed, the forms of the microorganisms on the surface of the filler are analyzed, and the microbial population structure is analyzed by adopting 16SrRNA high-throughput sequencing, so that methane oxidizing bacteria are enriched on the surface of the filler, organic matters can be generated by oxidizing methane through the methane oxidizing bacteria, the generated organic matters are used as a carbon source required by denitrification by denitrifying bacteria, and nitrate nitrogen in tail water is converted into nitrogen so as to fulfill the aim of denitrification by nitrate.
An underground water treatment system: the biomembrane reactor adopts a cobblestone packing layer and quartz sand as microorganism load packing, and the inlet gas is mixed gas of 3 percent of methane and 97 percent of nitrogen;
the groundwater treatment effect is as follows: as shown in figure 2, the total nitrogen of the inlet water is 32mg/L, the nitrate nitrogen is 30mg/L, the average removal rate of the total nitrogen is 36.74 percent and can reach 48.5 percent at most during the period from the inoculation start of the reactor to the operation of 30 days, and the average removal rate of the nitrate nitrogen is 36.64 percent and can reach 49.27 percent at most.
Example two:
referring to fig. 1, the system for repairing underground water nitrate and methane oxidizing bacteria of the present invention comprises an aeration system and an underground water repairing system, wherein the aeration system comprises a methane storage tank 1, an air intake pump 2, a flow meter 3 and an aeration device 5 which are sequentially connected together through an air intake pipe 4; the underground water remediation system is a permeable reactive barrier, the permeable reactive barrier is arranged on an underground water flow path, and a sealing cover 11 is arranged at the top of the permeable reactive barrier; permeable reactive barrier comprises drainage layer I6, reaction layer 7 and drainage layer II 8 that set gradually along the direction of flowing through, drainage layer I6 and the inside packing of drainage layer II 8 have I9 of filler, and the inside packing of reaction layer 7 has II 10 of filler, aeration equipment 5 arranges groundwater repair system's reaction layer 7 below, all is equipped with the water hole in drainage layer I6, drainage layer II 8 and reaction layer 7 both sides.
The aeration device 5 is a microporous aeration disc; the thickness of the water filtering layer I6 and the water filtering layer II 8 is 3.5m, round or square water passing holes are uniformly formed in the two sides of the water filtering layer, the opening rate is 45%, the hole diameter is 50mm, and the filler I9 is gravel or pebble with the particle size of 50mm. The thickness of the reaction layer 7 is 16m, and the filler II 10 is quartz sand or vesuvianite with the particle size of 20mm. The underground water remediation system is provided with 5 stages along an underground water flowing route, wherein the interval between every two stages is 4m.
When the underground water nitrate methane oxidizing bacteria repairing system is adopted to repair underground water nitrate, the method comprises the following steps:
the method comprises the following steps: firstly, methane-oxidizing bacteria are added into a reaction layer 7 of an underground water remediation system as inoculated microorganisms, wherein the inoculation concentration of the methane-oxidizing bacteria is 0.6mg dry mass/m 3 Then starting an aeration system, wherein the aeration intensity of the aeration system is 3.0L/(min m) 2 ) Carrying out microbial biofilm formation on the underground water remediation system for 4 days;
step two: after the microbial biofilm formation is finished, controlling the methane concentration through a flowmeter 3 to enable the methane concentration to be 4%;
step three: periodically detecting the ammonia nitrogen, total nitrogen and methane output of the effluent of each stage of underground water remediation system, and adjusting the aeration intensity and flow of the aeration system according to the actual condition;
step four: after the system is stable in operation, the growth condition of microorganisms on the surface of the filler in the underground water remediation system is observed, the forms of the microorganisms on the surface of the filler are analyzed, and the microbial population structure is analyzed by adopting 16SrRNA high-throughput sequencing, so that methane-oxidizing bacteria are enriched on the surface of the filler, organic matters can be generated by oxidizing methane by the methane-oxidizing bacteria, the generated organic matters are used as a carbon source required by denitrification by denitrifying bacteria, and nitrate nitrogen in tail water is converted into nitrogen, so that the purpose of nitrate denitrification is achieved.
An underground water treatment system: the biomembrane reactor adopts a cobblestone packing layer and quartz sand as microorganism load packing, and the inlet gas is mixed gas of 3 percent of methane and 97 percent of nitrogen;
the groundwater treatment effect is as follows: as shown in figure 3, the total nitrogen of the inlet water is 22mg/L, the nitrate nitrogen is 20mg/L, the average removal rate of the total nitrogen is 49.64 percent and can reach 56.14 percent at most during the period from the inoculation start of the reactor to the operation of 30 days, the average removal rate of the nitrate nitrogen is 50.97 percent and can reach 56.99 percent at most.
Example three:
referring to fig. 1, the system for repairing underground water nitrate and methane oxidizing bacteria of the present invention comprises an aeration system and an underground water repairing system, wherein the aeration system comprises a methane storage tank 1, an air intake pump 2, a flow meter 3 and an aeration device 5 which are sequentially connected together through an air intake pipe 4; the underground water remediation system is a permeable reactive barrier, the permeable reactive barrier is arranged on an underground water flow path, and a sealing cover 11 is arranged at the top of the permeable reactive barrier; permeable reactive barrier comprises drainage layer I6, reaction layer 7 and drainage layer II 8 that set gradually along the direction of flowing through, drainage layer I6 and the inside packing of drainage layer II 8 have I9 of filler, and the inside packing of reaction layer 7 has II 10 of filler, aeration equipment 5 arranges groundwater repair system's reaction layer 7 below, all is equipped with the water hole in drainage layer I6, drainage layer II 8 and reaction layer 7 both sides.
The aeration device 5 is a microporous aeration pipe; the thickness of the water filtering layer I6 and the water filtering layer II 8 is 3m, round or square water passing holes are uniformly formed in the two sides of the water filtering layer, the opening rate is 30%, the hole diameter is 25mm, the filler I9 is gravel or pebble, and the particle size is 40mm. The thickness of the reaction layer 7 is 10m, and the filler II 10 is quartz sand or vesuvianite with the particle size of 15mm. The groundwater remediation system was provided with 7 stages along the groundwater flow path, each stage being 3m apart.
When the underground water nitrate methane oxidizing bacteria remediation system is used for underground water nitrate remediation, the method comprises the following steps:
the method comprises the following steps: firstly, methane-oxidizing bacteria are added into a reaction layer 7 of an underground water remediation system as inoculation microorganisms, wherein the inoculation concentration of the methane-oxidizing bacteria is 0.8mg dry mass/m 3 Then starting an aeration system, wherein the aeration intensity of the aeration system is 4.0L/(min m) 2 ) Carrying out microbial biofilm formation on the underground water remediation system for 5 days;
step two: after the microbial biofilm formation is finished, controlling the methane concentration through a flowmeter 3 to enable the methane concentration to be 5%;
step three: periodically detecting the ammonia nitrogen, total nitrogen and methane output of the effluent of each stage of underground water remediation system, and adjusting the aeration intensity and flow of the aeration system according to the actual condition;
step four: after the system is stable in operation, the growth condition of microorganisms on the surface of the filler in the underground water remediation system is observed, the forms of the microorganisms on the surface of the filler are analyzed, and the microbial population structure is analyzed by adopting 16SrRNA high-throughput sequencing, so that methane-oxidizing bacteria are enriched on the surface of the filler, organic matters can be generated by oxidizing methane by the methane-oxidizing bacteria, the generated organic matters are used as a carbon source required by denitrification by denitrifying bacteria, and nitrate nitrogen in tail water is converted into nitrogen, so that the purpose of nitrate denitrification is achieved.
An underground water treatment system: the biomembrane reactor adopts a cobblestone packing layer and quartz sand as microorganism load packing, and the inlet gas is mixed gas of 3 percent of methane and 97 percent of nitrogen;
the groundwater treatment effect is as follows: as shown in FIG. 4, the total nitrogen of the inlet water is 12mg/L, the nitrate nitrogen is 10mg/L, and the average removal rate of the total nitrogen is 90.72 percent and can reach 98.41 percent at the highest, and the average removal rate of the nitrate nitrogen is 91.73 percent and can reach 98.83 percent at the highest during the period from the inoculation start of the reactor to the operation of 30 days.
Claims (6)
1. The utility model provides an underground water nitrate methane-oxidizing bacteria repair system, includes aeration systems and groundwater repair system, its characterized in that: the aeration system comprises a methane storage tank (1), an air inlet pump (2), a flow meter (3) and an aeration device (5) which are sequentially connected together through an air inlet pipe (4); groundwater repair system is permeable reactive barrier, and permeable reactive barrier sets up on the groundwater flow path line, permeable reactive barrier comprises filter layer I (6), reaction layer (7) and filter layer II (8) that set gradually along the direction of flowing through, filter layer I (6) and filter layer II (8) inside packing have filler I (9), and reaction layer (7) inside packing has filler II (10), reaction layer (5) are arranged repair system's reaction layer (7) below, all are equipped with the water hole in filter layer I (6), filter layer II (8) and reaction layer (7) both sides.
2. The groundwater nitrate methane oxidizing bacteria remediation system of claim 1, wherein: and a sealing cover (11) is arranged at the top of the permeable reactive wall.
3. A groundwater nitrate methane oxidizing bacteria remediation system as claimed in claim 1, wherein: the aeration device (5) is a microporous aeration pipe or a microporous aeration disc.
4. A groundwater nitrate methane oxidizing bacteria remediation system as claimed in claim 1, wherein: the thickness of the water filtering layer I (6) and the water filtering layer II (8) is 1.5-3.5 m, round or square water passing holes are uniformly formed in the two sides of the water filtering layer I (6) and the water filtering layer II (8), the opening rate is 20-45%, the hole diameter is 10-50 mm, the filler I (9) is gravel or pebbles, and the particle size is 30-50 mm.
5. A groundwater nitrate methane oxidizing bacteria remediation system as claimed in claim 1, wherein: the thickness of the reaction layer (7) is 8-16 m, and the filler II (10) is quartz sand or vesuvianite with the particle size of 10-20 mm.
6. A groundwater nitrate methane oxidizing bacteria remediation system as claimed in claim 1, wherein: the underground water remediation system is provided with 2-7 stages along an underground water flow path, and the interval between each stage is 2-6 m.
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