CN210367152U - Deep denitrification oxidation system for urban sewage treatment plant - Google Patents
Deep denitrification oxidation system for urban sewage treatment plant Download PDFInfo
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- CN210367152U CN210367152U CN201921363096.2U CN201921363096U CN210367152U CN 210367152 U CN210367152 U CN 210367152U CN 201921363096 U CN201921363096 U CN 201921363096U CN 210367152 U CN210367152 U CN 210367152U
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Abstract
The utility model provides a deep denitrification oxidation system for a town sewage treatment plant, which consists of four parts, namely a biomembrane reactor, a gas inlet and outlet system, a water inlet and outlet system and a hot water circulation system, wherein the device is divided into a continuous operation mode and an intermittent operation mode, and a main body of the reaction device is respectively connected with the gas inlet and outlet system, the water inlet and outlet system and the hot water circulation system; the reaction device main body is composed of a closed inner layer cylinder and an outer layer cylinder, wherein the inner layer cylinder is filled with filler and a cushion layer, and the bottom of the inner layer cylinder is provided with an aeration system. The utility model discloses utilize waste water anaerobism pond or the methane that mud anaerobic digestion produced to construct denitrification type methane oxidation system, can effectively reduce the nitrogen concentration of town sewage treatment plant play aquatic, reduce sewage treatment plant advanced treatment running cost, realize the utilization to methane, reduce the emission of methane, slow down the greenhouse effect that methane emission leads to, have apparent economy and environmental benefit.
Description
Technical Field
The utility model relates to a be used for cities and towns sewage treatment plant degree of depth denitrogenation oxidation system belongs to sewage treatment technical field.
Background
After urban domestic sewage is treated by the traditional sewage treatment process, the effluent still contains a large amount of nitrogen pollutants, and the discharge of excessive nitrogen can cause water eutrophication and destroy the ecological environment. Because the effluent treated by the traditional process has low C/N ratio and cannot meet the carbon source required by denitrification, the conventional deep denitrification treatment technology adopts an external carbon source mode, the commonly used carbon sources are glucose, methanol, sodium acetate, ethanol and the like, the problem of treatment cost increase, poor economic benefit, resource waste and the like is caused by the external carbon source mode, and the phenomenon of inaccurate carbon source addition is easy to occur under the condition of inlet water quality fluctuation, so that the effluent quality is influenced.
Methane is the simplest organic matter, has a stable structure and wide distribution in nature, and is the main component of methane, oil field gas, natural gas and coal mine pit gas. Wherein, the methane with 50-80% of the methane content is produced in marsh land, septic tank, lake sediment, waste water anaerobic tank, etc., and is realized by the microorganism anaerobic digestion of organic matters, belonging to secondary energy and renewable energy.
The related research shows that the methane-oxidizing bacteria can realize nitrogen removal while oxidizing methane, and the process is divided into denitrifying methane aerobic oxidation (AME-D) and denitrifying methane anaerobic oxidation (ANME-D), denitrifying methane aerobic oxidation (AME-D) and denitrifying methane anaerobic oxidation (ANME-D) processes, wherein the denitrifying methane aerobic oxidation (AME-D) and the denitrifying methane anaerobic oxidation (ANME-D) processes can effectively realize nitrogen removal, but the denitrifying methane aerobic oxidation (AME-D) processes need oxygen participation, two explanations exist for the action mechanism of the denitrifying methane aerobic oxidation process (AME-D), the denitrifying process is realized by aerobic methane-oxidizing bacteria ①, the related research shows that part of the genes of the methane-oxidizing bacteria contain denitrifying genes NiS, nirK, rB and the like, the denitrifying bacteria can generate carbon sources and methanol, and the denitrifying bacteria can generate carbon sources and generate methanol, and the intermediate products such as denitrifying bacteria ② and the like.
Therefore, how to utilize the methane that waste water anaerobic pool or mud anaerobic digestion produced to construct denitrification type methane oxidation system to reduce the nitrogen concentration of town sewage treatment plant effluent water, reduce sewage treatment plant advanced treatment running cost, realize the utilization of resource to methane, reduce the emission of methane, slow down the greenhouse effect scheduling problem that methane emission leads to is the technical problem that present sewage treatment is urgent to be solved.
SUMMERY OF THE UTILITY MODEL
The utility model discloses Total Nitrogen (TN) concentration is high in the sewage treatment plant tail water to the cities and towns, in the advanced treatment technology of present adoption, need additionally throw carbon sources such as methyl alcohol, sodium acetate, and the treatment cost is high, economic benefits is poor, the wasting of resources scheduling problem is outstanding, simultaneously because the anaerobism section in sewage and the sludge treatment process produces a large amount of methane-gas, directly discharges the environment, causes greenhouse effect, causes the pollution scheduling problem to the environment, the utility model provides a be used for cities and towns sewage treatment plant degree of depth denitrogenation oxidation system to overcome not enough among the prior art.
The technical scheme of the utility model: a deep denitrification oxidation system for a municipal sewage treatment plant comprises a reaction device main body, an air inlet and outlet system, an water inlet and outlet system and a hot water circulating system, wherein the reaction device main body is respectively connected with the air inlet and outlet system, the water inlet and outlet system and the hot water circulating system; the reaction device main body is composed of a closed inner layer cylinder and an outer layer cylinder, wherein the inner layer cylinder is filled with filler and a cushion layer, and the bottom of the inner layer cylinder is provided with an aeration system; the methane inlet and outlet system comprises an air inlet pipe connected with the bottom of the main body of the reaction device, a methane online monitor is mounted on the air inlet pipe, a methane inlet pipe and an air inlet pipe are connected in parallel at the air inlet end of the methane online monitor on the air inlet pipe, a methane inlet pump, a methane gas flowmeter and a valve are sequentially connected on the methane inlet pipe from the air inlet end to the air outlet end, and an air inlet pump, an air gas flowmeter and a valve are sequentially connected on the air inlet pipe from the air inlet end to the air outlet end; the water inlet and outlet system comprises a water inlet pipe or a water outlet pipe which is respectively connected with the bottom and the upper part of the main body of the reaction device, a water inlet tank, a water inlet pump and a valve are sequentially connected on the water inlet pipe from a water inlet end to a water outlet end, and the valve is arranged on the water outlet pipe; the hot water circulating system comprises a hot water inlet pipe and a hot water outlet pipe which are communicated with a cavity between an inner-layer cylinder and an outer-layer cylinder on the reaction device main body, the other ends of the hot water inlet pipe and the hot water outlet pipe are connected with a constant-temperature water tank, valves are arranged on the hot water inlet pipe and the hot water outlet pipe, a hot water circulating pump is arranged on the hot water inlet pipe close to the water inlet end, an air outlet pipe is connected to the top of the reaction device main body, and a valve and a methane on-line monitor are sequentially arranged on the air outlet pipe from the air inlet end.
Furthermore, a gas one-way valve and a valve are sequentially arranged between the methane on-line monitor and the reaction device main body on the gas inlet pipe.
Further, the filler is quartz sand with the particle size of 2-4 mm; the cushion layer is pebbles, and the particle size is 8-16 mm.
Further, the water inlet tank is filled with tail water of a sewage treatment plant.
Due to the adoption of the technical scheme, the utility model has the advantages of:
(1) the constructed reaction device has small occupied area, is simple and easy to implement, has low cost and easily controlled parameters;
(2) the concentration of methane in the inlet gas is low, and the inlet gas can be obtained by mixing methane generated by anaerobic digestion of wastewater or sludge with air, so that the deep treatment operation cost of a sewage treatment plant is reduced, the resource utilization of methane is realized, the emission of methane is reduced, the greenhouse effect caused by methane emission is slowed down, and the method has remarkable economic and environmental benefits and wide application prospect;
(3) an aerobic, anoxic and anaerobic biological membrane system is formed on the surface of the filler in the reaction device, and the enriched aerobic methane-oxidizing bacteria are used for oxidizing methane to generate organic matters so as to provide a carbon source for denitrification of denitrifying bacteria;
(4) the constructed denitrification type methane aerobic oxidation system (AME-D) can make full use of low-concentration methane mixed gas and realize the efficient removal of total nitrogen in the tail water of urban sewage.
Therefore, the utility model discloses utilize waste water anaerobism pond or the methane that mud anaerobic digestion produced to construct denitrification type methane oxidation system, can effectively reduce the nitrogen concentration of town sewage treatment plant play aquatic, reduce sewage treatment plant advanced treatment running cost, realize the utilization to the resource of methane, reduce the emission of methane, slow down the greenhouse effect that methane emission leads to, have apparent economy and environmental benefit.
Drawings
FIG. 1 is a schematic structural view of the present invention in a continuous operation mode;
FIG. 2 is a schematic structural view of the present invention in an intermittent operation mode;
FIG. 3 is a graph showing the effect of removing pollutants and total nitrogen during the stable period of the intermittent operation mode.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings and examples.
The embodiment of the utility model provides a: the structural schematic diagram of the deep denitrification oxidation system for the urban sewage treatment plant is shown in fig. 1 and fig. 2, and comprises a reaction device main body 1, an air inlet and outlet system and a hot water circulation system, wherein the reaction device main body 1 is respectively connected with the air inlet and outlet system, the air inlet and outlet system and the hot water circulation system; the reaction device main body 1 is composed of a closed inner layer cylinder and an outer layer cylinder, a filler 2 and a cushion layer 3 are filled in the inner layer cylinder, the filler 2 is quartz sand, and the particle size is 3 mm; the cushion layer 3 is pebbles with the particle size of 12 mm; an aeration system 4 is arranged at the bottom of the inner layer cylinder body, and the aeration system 4 is an aeration pipe or an aeration head; the gas inlet and outlet system comprises a gas inlet pipe 7 connected with the bottom of the reaction device main body 1, a methane online monitor 13 is installed on the gas inlet pipe 7, a methane inlet pipe 22 and an air inlet pipe 23 are connected in parallel at the gas inlet end of the methane online monitor 13 on the gas inlet pipe 7, a methane inlet pump 20, a methane gas flowmeter 18 and a valve 5 are sequentially connected to the methane inlet pipe 22 from the gas inlet end to the gas outlet end, an air inlet pump 21, an air gas flowmeter 19 and a valve 5 are sequentially connected to the air inlet pipe 23 from the gas inlet end to the gas outlet end, and a gas check valve 6 and a valve 5 are sequentially installed between the methane online monitor 13 and the reaction device main body 1 on the gas inlet pipe 7; the water inlet and outlet system comprises a water inlet pipe 9 or a water outlet pipe 10 which is respectively connected with the bottom and the upper part of the reaction device main body 1, a water inlet tank 16, a water inlet pump 14 and a valve 5 are sequentially connected on the water inlet pipe 9 from a water inlet end to a water outlet end, the valve 5 is arranged on the water outlet pipe 10, and tail water of a sewage treatment plant is contained in the water inlet tank 16; the hot water circulating system comprises a hot water inlet pipe 11 and a hot water outlet pipe 12 which are communicated with a cavity between an inner-layer cylinder and an outer-layer cylinder on the reaction device main body 1, the other ends of the hot water inlet pipe 11 and the hot water outlet pipe 12 are both connected with a constant temperature water tank 17, and an existing constant temperature control system is configured in the constant temperature water tank 17, so that the temperature of water in the constant temperature water tank 17 is ensured to be unchanged; all install valve 5 on hot water inlet tube 11 and hot water outlet pipe 12, be close to inlet end department on hot water inlet tube 11 and install hot water circulating pump 15, be connected with outlet duct 8 at the top of reaction unit main part 1, install valve 5 and methane on-line monitoring appearance 13 by inlet end to the end of giving vent to anger in proper order on outlet duct 8.
When the deep denitrification oxidation system for the urban sewage treatment plant is constructed, the following steps can be adopted:
the method comprises the following steps: adding inoculated sludge and wastewater into the reaction device main body 1, sealing, starting an air inlet and outlet system to ensure that only air is introduced into the reaction device main body 1 and no water is introduced, and carrying out microbial biofilm formation for 3 days;
step two: after the film hanging stage is finished, simultaneously starting an air inlet and outlet system, an air inlet and outlet system and a hot water circulating system to ensure that air and water are normally fed into the reaction device main body 1, feeding wastewater in the water inlet tank 16 into the reaction device main body 1 through the water inlet pump 14 to fully contact with the filler 2, thus constructing an aerobic, anoxic and anaerobic biofilm system on the surface of the filler 2, controlling the concentration of methane in the mixed gas through the methane gas flowmeter 18 and the air gas flowmeter 19 to ensure that the concentration of the methane in the mixed gas is 3 percent, and controlling the reaction temperature of the reaction device to be 28 ℃ through the hot water circulating system;
step three: monitoring the concentration of methane in the gas inlet pipe 7 and the gas outlet pipe 8 through a methane online monitor 13, observing the change of the concentration of methane in the gas inlet pipe 7 and the gas outlet pipe 8 in real time, detecting physicochemical indexes such as pH, DO, temperature, ammonia nitrogen, nitrous nitrogen, nitrate nitrogen, COD concentration and the like in and out water every 1d, and analyzing the removal condition of total nitrogen by a system;
step four: after the operation is carried out for a period of time, comparing the concentrations of methane in the gas inlet pipe 7 and the gas outlet pipe 8, calculating the consumption of the system on the methane, analyzing the denitrification efficiency of the system, and adjusting the concentration of the methane in the gas inlet pipe 7 according to the actual condition;
step five: after the system runs stably, the growth condition of microorganisms on the surface of the filler 2 in the reaction device main body 1 is observed, the forms of the microorganisms on the surface of the filler 2 are analyzed, the microbial population structure is analyzed by 16S rRNA high-throughput sequencing, main aerobic methane-oxidizing bacteria and denitrifying bacteria are identified, the aerobic methane-oxidizing bacteria are enriched on the surface of the filler 2, so that organic matters can be generated by oxidizing methane by the aerobic methane-oxidizing bacteria, the generated organic matters are used as a carbon source required by denitrifying bacteria denitrification, nitrate nitrogen in tail water is converted into nitrogen, and the aim of denitrification is fulfilled.
When the system adopts a continuous operation mode, the water inlet pipe 9 is connected to the bottom of the reaction device main body 1, the water outlet pipe 10 is connected to the upper part of the reaction device main body 1, and the hydraulic retention time range is 12-24 hours; when the system adopts the intermittent operation mode, connect inlet tube 9 in the upper portion of reaction unit main part 1, connect outlet pipe 10 in the bottom that should install main part 1, the operation cycle is "0.5 h of intaking + reaction 12 ~ 24h + play water 0.5 h", contrast the denitrogenation effect of continuous operation mode and intermittent operation mode, select the optimum mode operating system of denitrogenation.
In the embodiment, the tail water of the sewage treatment plant, the methane and the air are mixed and fed to form an environment suitable for the growth of the aerobic methane-oxidizing bacteria, the environment is divided into two operation modes (continuous operation and intermittent operation), and the process can be divided into four stages: membrane formation phase-enrichment phase-regulation phase-stabilization phase. The mixed gas formed by methane and air provides sufficient substrate for aerobic methane-oxidizing bacteria, so that the aerobic methane-oxidizing bacteria oxidize methane into organic matters, provide a carbon source for denitrifying bacteria and realize denitrification.
Referring to FIG. 3, in the case of ammonia nitrogen concentration of influent water of 8mg/L, total nitrogen concentration of 20mg/L and COD concentration of 20mg/L, the average removal rate of ammonia nitrogen is 93.28%, and the average removal rate of total nitrogen is 94.14%. Therefore, the utility model discloses utilize waste water anaerobism pond or the methane that mud anaerobic digestion produced to construct denitrification type methane oxidation system, can effectively reduce the nitrogen concentration of town sewage treatment plant play aquatic, reduce sewage treatment plant advanced treatment running cost, realize the utilization to the resource of methane, reduce the emission of methane, slow down the greenhouse effect that methane emission leads to, have apparent economy and environmental benefit.
Claims (4)
1. The utility model provides a be used for town sewage treatment plant degree of depth denitrogenation oxidation system, includes four major parts of reaction unit main part (1), business turn over gas system, business turn over water system and hot water circulating system, its characterized in that: the reaction device main body (1) is respectively connected with an air inlet and outlet system, a water inlet and outlet system and a hot water circulating system; the reaction device main body (1) is composed of a closed inner-layer cylinder and an outer-layer cylinder, a filler (2) and a cushion layer (3) are filled in the inner-layer cylinder, and an aeration system (4) is arranged at the bottom of the inner-layer cylinder; the methane inlet and outlet system comprises an air inlet pipe (7) connected with the bottom of the reaction device main body (1), a methane online monitor (13) is installed on the air inlet pipe (7), a methane inlet pipe (22) and an air inlet pipe (23) are connected in parallel at the air inlet end of the methane online monitor (13) on the air inlet pipe (7), a methane inlet pump (20), a methane gas flowmeter (18) and a valve (5) are sequentially connected to the methane inlet pipe (22) from the air inlet end to the air outlet end, and an air inlet pump (21), an air gas flowmeter (19) and a valve (5) are sequentially connected to the air inlet end to the air outlet end on the air inlet pipe (23); the water inlet and outlet system comprises a water inlet pipe (9) or a water outlet pipe (10) which is respectively connected to the bottom and the upper part of the reaction device main body (1), a water inlet tank (16), a water inlet pump (14) and a valve (5) are sequentially connected to the water inlet pipe (9) from a water inlet end to a water outlet end, and the valve (5) is installed on the water outlet pipe (10); hot water circulating system include with reaction unit main part (1) go up hot water inlet tube (11) and hot water outlet pipe (12) of cavity intercommunication between inlayer barrel and the outer barrel, the other end of hot water inlet tube (11) and hot water outlet pipe (12) all is connected with constant temperature water tank (17), all install valve (5) on hot water inlet tube (11) and hot water outlet pipe (12), be close to inlet end department on hot water inlet tube (11) and install hot water circulating pump (15), top at reaction unit main part (1) is connected with outlet duct (8), install valve (5) and methane on-line monitoring appearance (13) by inlet end to the end of giving vent to anger in proper order on outlet duct (8).
2. The deep denitrification oxidation system for urban sewage treatment plants according to claim 1, wherein: and a gas check valve (6) and a valve (5) are sequentially arranged between the methane on-line monitor (13) and the reaction device main body (1) on the gas inlet pipe (7).
3. The deep denitrification oxidation system for urban sewage treatment plants according to claim 1, wherein: the filler (2) is quartz sand with the particle size of 2-4 mm; the cushion layer (3) is pebbles, and the particle size is 8-16 mm.
4. The deep denitrification oxidation system for urban sewage treatment plants according to claim 1, wherein: the water inlet tank (16) is filled with tail water of a sewage treatment plant.
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| CN110357257A (en) * | 2019-08-21 | 2019-10-22 | 贵州大学 | One kind being used for urban wastewater treatment firm advanced nitrogen oxidative system and construction method |
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| CN110357257A (en) * | 2019-08-21 | 2019-10-22 | 贵州大学 | One kind being used for urban wastewater treatment firm advanced nitrogen oxidative system and construction method |
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