CN111573833A - Anaerobic ammonia oxidation coupling methane oxidation process control method for high-concentration ammonia nitrogen organic wastewater methanogenesis treatment system - Google Patents
Anaerobic ammonia oxidation coupling methane oxidation process control method for high-concentration ammonia nitrogen organic wastewater methanogenesis treatment system Download PDFInfo
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Abstract
The invention discloses a control method of an anaerobic ammonia oxidation coupling methane oxidation process of a high-concentration ammonia nitrogen organic wastewater methanogenesis treatment system, which comprises the following steps: (1) establishing a reaction system; (2) granular sludge culture and methanogenesis efficiency realization; (3) establishing micro-aerobic methane-producing granular sludge; (4) establishing autotrophic nitrogen removal; (5) realizing the methane oxidation function; (6) autotrophic nitrogen removal and methane oxidation coupling: through the steps, the four functional microorganisms MPB, AOB, AnAOB and MOB coexist in the single micro-aerobic granular sludge reaction system, the removal rates of COD, ammonia nitrogen and total nitrogen of the system are respectively up to 88%, 90% and 82%, and the methane yield is stabilized at 1000-2000 mL/d. The invention has reasonable design and good practical application value.
Description
Technical Field
The invention belongs to the technical field of biological treatment of wastewater, and particularly relates to a control method of an anaerobic ammonia oxidation coupling methane oxidation process of a high-concentration ammonia nitrogen organic wastewater methanogenesis treatment system.
Background
Anaerobic digestion is widely used for treating high-concentration organic wastewater due to the advantages of reliability, economy and capability of recovering methane, however, wastewater discharged by industries such as coking, coal chemical industry, slaughtering, livestock and poultry, breeding, pharmacy, tanning, garbage landfill and the like not only has high-concentration COD, but also has a large amount of ammonia nitrogen and organic nitrogen. The traditional digestion process can only remove COD in the wastewater and convert organic nitrogen into ammonia nitrogen, but cannot remove the ammonia nitrogen in the wastewater, and the effluent of high-concentration ammonia nitrogen can cause the problems of water body hypoxia, blackening and stink and eutrophication; on the other hand, the large amount of dissolved methane carried in the anaerobic digestion solution may form a potential greenhouse effect on the atmospheric environment. The conventional anaerobic method generally needs to further perform anoxic/aerobic denitrification, but this will inevitably increase the operation difficulty and the operation cost, so that how to simultaneously obtain nitrogen and remove dissolved methane in a methane production system is a problem which is worthy of research and very challenging.
In recent years, a new biological sewage treatment process represented by anaerobic ammonia oxidation and methane oxidation is expected to provide a new solution for the problem. If two processes can be effectively integrated in a single-stage granular sludge methane production system, through environmental conditions and process control, key functional microorganisms such as Ammonia Oxidizing Bacteria (AOB), anaerobic ammonia oxidizing bacteria (AnAOB) and Methane Oxidizing Bacteria (MOB) are cultured and enriched in a micro-aerobic environment, partial nitrosation/anaerobic ammonia oxidation autotrophic denitrification is established by utilizing the AOB and the AnAOB, and methane generated continuously in situ is directly or oxidized into methanol under the action of the MOB to serve as a denitrification electron acceptor for autotrophic denitrification to generate nitrate, so that more thorough denitrification and dissolved methane removal efficiency is obtained, partial gaseous methane is recycled at the same time, and finally multiple targets of recycling high-concentration ammonia nitrogen organic wastewater, efficient sustainable treatment and greenhouse gas emission reduction are realized.
Disclosure of Invention
The invention provides a control method of an anaerobic ammonia oxidation coupling methane oxidation process of a high-concentration ammonia nitrogen organic wastewater methanogenesis treatment system, aiming at solving the problem that the existing digestive juice process after anaerobic digestion treatment of high ammonia nitrogen organic wastewater contains a large amount of ammonia nitrogen and dissolved methane, thereby causing double risks of water environment and atmospheric environment.
The invention is realized by adopting the following technical scheme:
a control method of anaerobic ammonia oxidation coupling methane oxidation process of a high-concentration ammonia nitrogen organic wastewater methanogenesis treatment system comprises the following steps:
(1) establishing a reaction system comprising: a water inlet adjusting tank, a water inlet peristaltic pump, an expanded granular sludge bed biomembrane reactor, an internal circulating pump and an air compressor;
the expanded granular sludge bed biofilm reactor comprises a main reaction zone and a three-phase separator, and the volume ratio of (1-1.2) to (1); a temperature controller is arranged outside the main reaction zone, a sludge bed is arranged at the lower part in the main reaction zone, and a fixed packed bed is arranged at the top in the main reaction zone; the three-phase separator is positioned at the top of the reactor, and the main reaction area and the three-phase separator are both provided with a sampling port and an observation port.
(2) Granular sludge culture and methanogenesis efficiency realization
The sludge bed adopts sludge in a concentration tank of an urban sewage treatment plant as inoculation sludge, the inoculation sludge is directly pumped into a main reaction zone in the reactor through a pump, and the inoculation volume accounts for 20-40% of the main reaction zone; a fixed packed bed is not arranged in the main reaction zone;
the COD of the inlet water (simulated organic wastewater) entering the inlet water regulating tank is maintained at 2000-5000 mg/L, the inlet water enters the expanded granular sludge bed biofilm reactor through the inlet water peristaltic pump, the Hydraulic Retention Time (HRT) in the initial stage is controlled to be 4d, the water temperature of the system is controlled to be 35 +/-2 ℃ through a temperature controller, and the system starts to generate biogas after running for 30-60 d; then, the HRT is gradually shortened, and granular sludge culture is carried out, namely the HRT is gradually shortened from 4d to 2d, 1d and 0.5d in a water quantity increasing mode, and the running time of each HRT is 5-7 d; at this time, the COD removal rate was 92% or more (as seen by microscopic observation and high-throughput sequencing), and the sludge was mainly methanogenic bacteria (MPB), and was in the form of black brown particles.
(3) Micro-aerobic methane-producing granular sludge establishment
Anaerobic operation is converted into micro-aerobic operation through an aeration mode, namely DO in the reactor is controlled to be 0.2-0.3 mg/L, ORP (oxidation reduction potential) is less than-300 mv, the operation time is 40-60 days, the color of the granular sludge is gradually changed from black brown to light yellow, the sludge concentration is 50-70 g/L, and the average particle size is 0.5-2 mm.
(4) Establishment of autotrophic nitrogen removal
Ammonia nitrogen is added into inlet water, the ammonia nitrogen concentration is controlled at 100mg/L, Ammonia Oxidizing Bacteria (AOB) functional sludge and anaerobic ammonia oxidizing bacteria (AnAOB) functional sludge are respectively inoculated into microaerophilic methane-producing granular sludge (namely, Ammonia Oxidizing Bacteria (AOB) functional sludge and anaerobic ammonia oxidizing bacteria (AnAOB) functional sludge are pumped into the bottom of a main reaction area of a reactor through a water pump, and the inoculation amount respectively accounts for 10% of the total volume of the system granular sludge (namely the microaerophilic methane-producing granular sludge in the step 3); the removal rate of ammonia nitrogen and total nitrogen in the system reaches more than 95% and 85% respectively; then gradually increasing the ammonia nitrogen of the inlet water to 200mg/L, 300mg/L and 500mg/L, and operating each concentration gradient for 10-15 d; finally, the removal rates of ammonia nitrogen and total nitrogen are respectively more than 90% and 80%.
(5) Realizing the oxidation function of methane
Arranging a fixed packed bed at the top in the main reaction zone, wherein the fixed packed bed accounts for 40-60% of the volume of the main reaction zone; the polyurethane sponge is filled in the fixed packed bed, the polyurethane sponge is 8-25 mm cube, the inner aperture is 2-7 mm, and the filling rate is 40% -60%;
inoculating cultured methane-oxidizing bacteria (MOB) activated sludge into a fixed packed bed, wherein the inoculation amount accounts for 5% of the total volume of system granular sludge (namely the microaerophilic methane-generating granular sludge in the step 3);
by controlling the internal circulation, the rising flow rate of water flow is ensured to be 2.0-2.5 m/h, the granular sludge is in a micro-expansion state, in the internal circulation process, the fixed packed bed ensures the contact performance of methane, a substrate and microorganisms and prolongs the contact time, and after 30-60 days, (discovered by high-throughput sequencing), the methyloxicoccus with the MOB function accounts for more than 1% of the total amount of the system microorganisms, and marks the formation of methane oxidation.
(6) Autotrophic nitrogen removal and methane oxidation coupling
Through the steps, the four functional microorganisms MPB, AOB, AnAOB and MOB coexist in the single micro-aerobic granular sludge reaction system, the removal rates of COD, ammonia nitrogen and total nitrogen of the system are respectively up to 88%, 90% and 82%, and the methane yield is stabilized at 1000-2000 mL/d.
The invention provides a method for continuously treating high-concentration ammonia nitrogen organic wastewater by simultaneously coupling anaerobic ammonia oxidation and methane oxidation in a micro-aerobic granular sludge expanded biomembrane methane production system. By means of microbial culture, device improvement, environmental condition control, technological process strengthening and the like, key functional microorganisms such as Methanogen (MPB), Ammonia Oxidizing Bacteria (AOB), anaerobic ammonia oxidizing bacteria (ANAOB) and Methane Oxidizing Bacteria (MOB) are synchronously enriched in a micro-aerobic environment, AOB and ANAOB are utilized to establish partial nitrosation/anaerobic ammonia oxidation autotrophic denitrification, methane continuously generated in situ through MPB is directly or oxidized into methanol under the action of MOB to serve as a denitrification electron acceptor for generating nitrate through anaerobic ammonia oxidation, so that more thorough denitrification and dissolved methane removal are realized, and partial gaseous methane recovery can be obtained.
The invention has the following beneficial effects:
1. the reactor for producing methane by using the micro-aerobic granular sludge realizes the high-efficiency removal of organic matters and nitrogen in the high-concentration ammonia nitrogen organic wastewater.
2. The ammonia nitrogen in the wastewater is removed through a shortcut nitrification/anaerobic ammonia oxidation way, so that a large amount of oxygen and organic carbon sources can be saved.
3. Methane generated by the reactor is used as a gas source, methane oxidizing bacteria are efficiently enriched in a biological carrier area, and the methane is oxidized into methanol under the micro-aerobic condition and is utilized by denitrifying bacteria or directly utilized by denitrifying methane oxidation, so that synchronous denitrification and emission reduction by dissolving methane are realized.
4. Through autotrophic nitrogen removal and methane oxidation synchronous coupling, the system can remove more than 88% of COD and more than 90% of NH3-NAnd more than 82% of TN, and recovering more than 1000-2000 mL/d of methane.
5. The method is economic and efficient, not only removes organic matters and ammonia nitrogen in the wastewater, but also eliminates the water-soluble methane in a single reaction system, and simultaneously recovers part of gaseous methane, thereby generating good environmental and economic benefits.
The invention innovatively couples anaerobic ammonia oxidation and methane oxidation synchronously in a single-stage micro-aerobic granular sludge methane production system to treat high-concentration organic ammonia nitrogen wastewater by the coexistence and mutual cooperation of the advantages of methanogenic bacteria, ammonia oxidizing bacteria, anaerobic ammonia oxidizing bacteria, methane oxidizing bacteria and denitrifying bacteria at different positions of the system space, has the advantages of energy conservation, high efficiency, capability of recycling methane, no need of external organic carbon source, elimination of greenhouse effect caused by dissolved methane in wastewater, small occupied area, simple and convenient operation, low energy consumption, low operation cost and the like.
The invention has reasonable design and good practical application value.
Drawings
FIG. 1 shows a schematic diagram of a high-concentration ammonia nitrogen organic wastewater methanogenesis treatment system.
In the figure: 1-water inlet adjusting tank, 2-water inlet peristaltic pump, 3-water inlet, 4-sludge bed, 5-packed bed, 6-three-phase separator, 7-gas collecting port, 8-triangular water outlet weir, 9-sampling port, 10-sludge discharging port, 11-internal circulating pump, 12-air compressor, 13-mass flow meter, 14-wet gas flow meter, 15-temperature controller (heating temperature controller), 16-micro oxygen particle sludge expanded bed biomembrane reactor (EGSBBR), 17-main reaction zone and 18-water outlet.
Detailed Description
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
As shown in fig. 1, a micro-aerobic methanogenic granular sludge reaction treatment system is established, comprising: the system comprises a water inlet adjusting tank 1, a water inlet peristaltic pump 2, an expanded granular sludge bed biofilm reactor 16 (EGSBBR), an internal circulating pump 11, an air compressor 12, a water outlet tank and the like.
The expanded granular sludge bed biofilm reactor 16 comprises a main reaction zone 17 and a three-phase separator 6, wherein the volume ratio of (1-1.2) to (1); the three-phase separator 6 is positioned at the top of the reactor and mainly has the functions of precipitating sludge, separating the treated wastewater and collecting methane gas; a temperature controller 15 is arranged outside the main body reaction zone 17, a sludge discharge port 10 is arranged at the bottom of the main body reaction zone 17, a sludge bed 4 is arranged at the inner lower part of the main body reaction zone 17, a fixed packed bed 5 is arranged at the inner top of the main body reaction zone 17, and the fixed packed bed 5 accounts for 40-60% of the volume of the main body reaction zone 17; the main reaction zone 17 and the three-phase separator 6 are provided with a sampling port 9 and a viewing port. A mass flow meter 13 is arranged on an outlet pipeline of an air compressor 12 and then the outlet pipeline is introduced into a water inlet regulating tank 1, an outlet at the bottom of the water inlet regulating tank 1 is connected with a water inlet 3 at the bottom of a main body reaction zone 17 of an expanded granular sludge bed biomembrane reactor 16 through a water inlet peristaltic pump 2, a triangular water outlet weir 8 of a three-phase separator 6 of the expanded granular sludge bed biomembrane reactor 16 is communicated with the water inlet 3 at the bottom of the main body reaction zone 17 through an internal circulating pump 11, and a water outlet 18 is additionally connected with the triangular water outlet; the gas collection port 7 of the three-phase separator 6 is provided with a wet gas flowmeter 14.
In order to efficiently enrich methane-oxidizing bacteria, the fixed biological packed bed 5 needs to be added to increase the mass transfer efficiency of methane in a biological membrane, prolong the contact time of methane and microorganisms and provide a good living microenvironment for the methane-oxidizing bacteria. Polyurethane (PU) sponge is filled in the fixed packed bed 5, the polyurethane sponge is 8-25 mm cube, the inner hole diameter is 2-7 mm, the polyurethane sponge and the inner hole diameter are communicated, and the carrier filling rate is 40% -60%.
The process control method mainly comprises the following steps: the sludge bed 4 adopts sludge in a concentration tank of an urban sewage treatment plant as inoculation sludge, the inoculation volume accounts for 20-40% of that of the main reaction zone 17, the anaerobic methanogenesis starting and the anaerobic granular sludge formation are completed, on the basis, an air compressor 12 is started, the aeration is increased, and the DO is accurately controlled at 0.2-0.3 mg/L; at the moment, the black anaerobic granular sludge is converted into light yellow micro-aerobic granular sludge, on the basis of formation, 10 percent (volume ratio) of Ammonia Oxidizing Bacteria (AOB) functional sludge and anaerobic ammonia oxidizing bacteria (AnAOB) functional sludge are respectively added into a sludge bed 4 to establish autotrophic denitrification, and on the basis, 5 percent (volume ratio) of Methane Oxidizing Bacteria (MOB) active sludge is further added into a filler area 5 to complete the coupling of autotrophic denitrification and methane oxidation. Finally ensuring the coexistence of methanogens, ammonia oxidizing bacteria, anaerobic ammonia oxidizing bacteria and methane oxidizing bacteria.
Example 1
A control method of anaerobic ammonia oxidation coupling methane oxidation process of a high-concentration ammonia nitrogen organic wastewater methanogenesis treatment system comprises the following steps:
(1) and constructing an anaerobic reaction system, comprising: a water inlet adjusting tank, a water inlet peristaltic pump, an expanded granular sludge bed biomembrane reactor (not comprising a fixed packed bed), a heating temperature controller, an internal circulating pump, a water outlet tank and the like.
(2) Granular sludge culture and methanogenesis efficiency realization
The sludge bed 4 adopts sludge in a concentration tank of an urban sewage treatment plant as inoculation sludge, and the inoculation volume accounts for 25 percent of that of the main reaction zone 17;
the COD (glucose or sodium acetate as a substrate) of inlet water (simulated organic wastewater) is maintained at 2000mg/L, the Hydraulic Retention Time (HRT) of an initial stage is controlled to be 4d, the water temperature of a system is controlled to be 35 +/-2 ℃, and small bubbles (methane) are generated after the operation is carried out for 30-60 d; then, the HRT is gradually shortened, granular sludge culture is carried out, the HRT is gradually shortened from 4d to 2d, 1d and 0.5d in a water quantity increasing mode, and the running time of each HRT is 5-7 d; at this time, the COD removal rate was 92% or more, and it was found by microscopic observation and high-throughput sequencing that the sludge was in the form of dark brown particles mainly composed of MPB (methanogen) of methanogenic filamentous bacteria, and the methanogenic effect was excellent.
(3) Establishment of micro-aerobic methane-producing granular sludge system
Anaerobic operation is converted into micro-aerobic operation through an aeration mode, DO in the reactor is controlled to be 0.2-0.3 mg/L, ORP is less than-300 mv, the operation time is 40-60 days, the color of granular sludge is gradually changed from black brown to light yellow, the sludge concentration is 50-70 g/L, the average particle size is 0.5-2 mm, and the sedimentation performance is excellent.
(4) Autotrophic nitrogen removal establishment
By adding ammonia nitrogen (as NH) to the feed water4Cl is taken as a substrate), the ammonia nitrogen concentration is firstly controlled at 100mg/L, and ammonia oxidizing bacteria (are) cultured in a laboratoryAOB) functional sludge and anaerobic ammonium oxidation bacteria (AnAOB) functional sludge are respectively inoculated into microaerophilic methane-producing granular sludge, and the inoculation amount respectively accounts for 10 percent of the total amount (volume) of the granular sludge of the system; the removal rate of ammonia nitrogen and total nitrogen in the system reaches more than 95% and 85%; then gradually increasing the ammonia nitrogen of the inlet water to 200mg/L, 300mg/L and 500mg/L, and operating each concentration gradient for 10-15 d; finally, the removal rate of ammonia nitrogen and total nitrogen is more than 90 percent and 80 percent.
(5) Realizing the oxidation function of methane
A fixed packed bed 5 is additionally arranged in the main reaction zone 17, and the fixed packed bed 5 accounts for 45% of the volume of the main reaction zone 17; filling Polyurethane (PU) sponge, wherein the PU sponge is 8-25 mm cube, the inner aperture is 2-7 mm, the PU sponge and the PU sponge are mutually communicated, the filling rate of a carrier (the PU sponge) is 50%, and the cultured methane-oxidizing bacteria (MOB) activated sludge is inoculated into a fixed packed bed 5 (a biological carrier region) of a reactor, and the inoculation amount accounts for 5% of the total amount (volume) of the granular sludge of the system;
by controlling the internal circulation, the rising flow rate of water flow is ensured to be 2.0-2.5 m/h, at the moment, the granular sludge is in a micro-expansion state, the good contact performance of methane, a substrate and microorganisms is ensured and the contact time is prolonged by the fixed packed bed 5 (a biological carrier region), and after 30-60 d, the methyloxicoccus with the MOB function accounts for more than 1% of the total amount of the system microorganisms through high-throughput sequencing, and the formation of methane oxidation is marked.
(6) Autotrophic nitrogen removal and methane oxidation coupling
Through the steps, four functional microorganisms (MPB, AOB, AnAOB and MOB) coexist in the single micro-aerobic granular sludge reactor, the removal rate of COD of the system reaches 94.6 percent, and NH is added3The N removal rate is 93.8 percent, the TN removal rate is 83.5 percent, and the methane recovery amount is 1200 mL/d.
Example 2
A control method of anaerobic ammonia oxidation coupling methane oxidation process of a high-concentration ammonia nitrogen organic wastewater methanogenesis treatment system comprises the following steps:
(1) and constructing an anaerobic reaction system, comprising: a water inlet adjusting tank, a water inlet peristaltic pump, an expanded granular sludge bed biomembrane reactor (not comprising a fixed packed bed), a heating temperature controller, an internal circulating pump, a water outlet tank and the like.
(2) Granular sludge culture and methanogenesis efficiency realization
The sludge bed 4 adopts sludge in a concentration tank of an urban sewage treatment plant as inoculation sludge, and the inoculation volume accounts for 30 percent of that of the main reaction zone 17;
the COD (glucose or sodium acetate as a substrate) of the inlet water is maintained at 4000mg/L, the Hydraulic Retention Time (HRT) of the initial stage is controlled to be 4d, the water temperature of the system is controlled to be 35 +/-2 ℃ for operation, and small bubbles (methane) are generated after the operation is carried out for 30-60 d; then, the HRT is gradually shortened, granular sludge culture is carried out, the HRT is gradually shortened from 4d to 2d, 1d and 0.5d in a water quantity increasing mode, and the running time of each HRT is 5-7 d; at this time, the COD removal rate was 92% or more, and it was found by microscopic observation and high-throughput sequencing that the sludge was in the form of dark brown particles mainly composed of MPB (methanogen) of methanogenic filamentous bacteria, and the methanogenic effect was excellent.
(3) Establishment of micro-aerobic methane-producing granular sludge system
Anaerobic operation is converted into micro-aerobic operation through an aeration mode, DO in the reactor is controlled to be 0.2-0.3 mg/L, ORP is less than-300 mv, the operation time is 40-60 days, the color of the granular sludge is gradually changed from black brown to light yellow, and the sludge concentration is 50-70 g/L; the average grain diameter is 0.5-2 mm, and the sedimentation performance is excellent.
(4) Establishment of autotrophic nitrogen removal
By adding ammonia nitrogen (as NH) to the feed water4Cl is taken as a substrate), the ammonia nitrogen concentration is firstly controlled at 100mg/L, and Ammonia Oxidizing Bacteria (AOB) functional sludge and anaerobic ammonia oxidizing bacteria (AnAOB) functional sludge which are cultured in a laboratory are inoculated into a microaerophilic methane-producing granular sludge system, wherein the inoculation amount respectively accounts for 10 percent of the total amount (volume) of granular sludge of the system; the removal rate of ammonia nitrogen and total nitrogen in the system reaches more than 95% and 85%; then gradually increasing the ammonia nitrogen of the inlet water to 200mg/L, 300mg/L and 500mg/L, and operating each concentration gradient for 10-15 d; finally, the removal rate of ammonia nitrogen and total nitrogen is more than 90 percent and 80 percent.
(5) Realizing the oxidation function of methane
A fixed packed bed is additionally arranged in the main reaction zone to serve as a biological carrier packing zone, and the fixed packed bed accounts for 50% of the volume of the main reaction zone; filling Polyurethane (PU) sponge, wherein the PU sponge is 8-25 mm cube, the inner pore diameter is 2-7 mm, the PU sponge and the PU sponge are mutually communicated, the filling rate of the carrier (PU sponge) is 60%, and the cultured methane-oxidizing bacteria (MOB) activated sludge is inoculated into a fixed packed bed of a reactor, and the inoculation amount accounts for 5% of the total amount (volume) of the granular sludge of the system;
by controlling the internal circulation, the rising flow rate of water flow is ensured to be 2.0-2.5 m/h, the granular sludge is in a micro-expansion state, the good contact performance of methane, a substrate and microorganisms is ensured in a biological carrier region, the contact time is prolonged, and after 30-60 d, the methyloxicoccus with the MOB function accounts for more than 1% of the total amount of the system microorganisms through high-throughput sequencing, and the formation of methane oxidation is marked.
(6) Autotrophic nitrogen removal and methane oxidation coupling
Through the steps, four functional microorganisms (MPB, AOB, AnAOB and MOB) coexist in the single micro-aerobic granular sludge reactor, the removal rate of COD of the system reaches 93.3 percent, and NH is added3The N removal rate is 93.2 percent, the TN removal rate is 84.0 percent, and the methane recovery amount is 1520 mL/d.
Example 3
A control method of anaerobic ammonia oxidation coupling methane oxidation process of a high-concentration ammonia nitrogen organic wastewater methanogenesis treatment system comprises the following steps:
(1) and constructing an anaerobic reaction system, comprising: a water inlet adjusting tank, a water inlet peristaltic pump, an expanded granular sludge bed biomembrane reactor (not comprising a fixed packed bed), a heating temperature controller, an internal circulating pump, a water outlet tank and the like.
(2) Granular sludge culture and methanogenesis efficiency realization
The sludge bed 4 adopts sludge in a concentration tank of an urban sewage treatment plant as inoculation sludge, and the inoculation volume accounts for 40 percent of that of the main reaction zone 17;
the COD (glucose or sodium acetate as a substrate) of the inlet water is maintained at 5000mg/L, the Hydraulic Retention Time (HRT) of the initial stage is controlled to be 4d, the water temperature of the system is controlled to be 35 +/-2 ℃ for operation, and after the operation is carried out for 30-60 d, small bubbles (methane) begin to be generated; then, the HRT is gradually shortened, granular sludge culture is carried out, the HRT is gradually shortened from 4d to 2d, 1d and 0.5d in a water quantity increasing mode, and the running time of each HRT is 5-7 d; at this time, the COD removal rate was 92% or more, and it was found by microscopic observation and high-throughput sequencing that the sludge was in the form of dark brown particles mainly composed of MPB (methanogen) of methanogenic filamentous bacteria, and the methanogenic effect was excellent.
(3) Establishment of micro-aerobic methane-producing granular sludge system
Anaerobic operation is converted into micro-aerobic operation through an aeration mode, DO in the reactor is controlled to be 0.2-0.3 mg/L, ORP is less than-300 mv, the operation time is 40-60 days, the color of the granular sludge is gradually changed from black brown to light yellow, and the sludge concentration is 50-70 g/L; the average grain diameter is 0.5-2 mm, and the sedimentation performance is excellent.
(4) Establishment of autotrophic nitrogen removal
By adding ammonia nitrogen (as NH) to the feed water4Cl is taken as a substrate), ammonia nitrogen concentration is controlled at 100mg/L, Ammonia Oxidizing Bacteria (AOB) functional sludge and anaerobic ammonia oxidizing bacteria (ANAOB) functional sludge which are cultured in a laboratory are respectively inoculated into a micro-aerobic methanogenic granular sludge system, and the inoculation amount respectively accounts for 10 percent of the total amount (volume) of granular sludge of the system; the removal rate of ammonia nitrogen and total nitrogen in the system reaches more than 95% and 85%; then gradually increasing the ammonia nitrogen of the inlet water to 200mg/L, 300mg/L and 500mg/L, and operating each concentration gradient for 10-15 d; finally, the removal rate of ammonia nitrogen and total nitrogen is more than 90 percent and 80 percent.
(5) Realizing the oxidation function of methane
A fixed packed bed is additionally arranged in the main reaction zone to serve as a biological carrier packing zone, and the fixed packed bed accounts for 60 percent of the volume of the main reaction zone; filling Polyurethane (PU) sponge, wherein the PU sponge is 8-25 mm cube, the inner pore diameter is 2-7 mm, the PU sponge and the PU sponge are mutually communicated, the filling rate of a carrier (the PU sponge) is 55%, and the cultured methane-oxidizing bacteria (MOB) activated sludge is inoculated into a fixed packed bed of a reactor, and the inoculation amount accounts for 5% of the total amount (volume) of the granular sludge of the system;
by controlling the internal circulation, the rising flow rate of water flow is ensured to be 2.0-2.5 m/h, the granular sludge is in a micro-expansion state, the good contact performance of methane, a substrate and microorganisms is ensured in a biological carrier region, the contact time is prolonged, and after 30-60 d, the methyloxicoccus with the MOB function accounts for more than 1% of the total amount of the system microorganisms through high-throughput sequencing, and the formation of methane oxidation is marked.
(6) Autotrophic nitrogen removal and methane oxidation coupling
Through the steps, four functional microorganisms (MPB, AOB, AnAOB and MOB) coexist in a single micro-aerobic granular sludge reactor, the removal rate of COD (chemical oxygen demand) of the system reaches 88.5 percent, and NH (ammonia) is removed3The N removal rate is 92.0 percent, the TN removal rate is 82.6 percent, and the methane recovery is 1850 mL/d.
Example 4
A control method of anaerobic ammonia oxidation coupling methane oxidation process of a high-concentration ammonia nitrogen organic wastewater methanogenesis treatment system comprises the following steps:
(1) and constructing an anaerobic reaction system, comprising: a water inlet adjusting tank, a water inlet peristaltic pump, an expanded granular sludge bed biomembrane reactor (not comprising a fixed packed bed), a heating temperature controller, an internal circulating pump, a water outlet tank and the like.
(2) Granular sludge culture and methanogenesis efficiency realization
The sludge bed 4 adopts sludge in a concentration tank of an urban sewage treatment plant as inoculation sludge, and the inoculation volume accounts for 40 percent of that of the main reaction zone 17;
the COD of the inlet water (glucose or sodium acetate is used as a substrate) is maintained at 2200mg/L, the Hydraulic Retention Time (HRT) of the initial stage is controlled to be 4d, the water temperature of the system is controlled to be 35 +/-2 ℃ for operation, and after the operation is carried out for 30-60 d, small bubbles (methane) begin to be generated; then, the HRT is gradually shortened, granular sludge culture is carried out, the HRT is gradually shortened from 4d to 2d, 1d and 0.5d in a water quantity increasing mode, and the running time of each HRT is 5-7 d; at this time, the COD removal rate was 92% or more, and it was found by microscopic observation and high-throughput sequencing that the sludge was in the form of dark brown particles mainly composed of MPB (methanogen) of methanogenic filamentous bacteria, and the methanogenic effect was excellent.
(3) Establishment of micro-aerobic methane-producing granular sludge system
Anaerobic operation is converted into micro-aerobic operation through an aeration mode, DO in the reactor is controlled to be 0.2-0.3 mg/L, ORP is less than-300 mv, the operation time is 40-60 days, the color of the granular sludge is gradually changed from black brown to light yellow, and the sludge concentration is 50-70 g/L; the average grain diameter is 0.5-2 mm, and the sedimentation performance is excellent.
(4) Establishment of autotrophic nitrogen removal
By adding ammonia nitrogen (as NH) to the feed water4Cl is taken as a substrate), ammonia nitrogen concentration is controlled at 100mg/L, Ammonia Oxidizing Bacteria (AOB) functional sludge and anaerobic ammonia oxidizing bacteria (ANAOB) functional sludge which are cultured in a laboratory are respectively inoculated into a micro-aerobic methanogenic granular sludge system, and the inoculation amount respectively accounts for 10 percent of the total amount (volume) of granular sludge of the system; the removal rate of ammonia nitrogen and total nitrogen in the system reaches more than 95% and 85%; then, the ammonia nitrogen of the inlet water is gradually increased to 200mg/L, 300mg/L and 500mg/L, each concentration gradient runs for 10-15 d, and finally the removal rate of the ammonia nitrogen and the total nitrogen is more than 90% and 80%.
(5) Realizing the oxidation function of methane
A fixed packed bed is additionally arranged in the main reaction area to serve as a biological carrier packing area, and the fixed packed bed accounts for 40% of the volume of the main reaction area; filling Polyurethane (PU) sponge, wherein the PU sponge is 8-25 mm cube, the inner pore diameter is 2-7 mm, the PU sponge and the PU sponge are mutually communicated, the filling rate of a carrier (the PU sponge) is 55%, and the cultured methane-oxidizing bacteria (MOB) activated sludge is inoculated into a fixed packed bed of a reactor, and the inoculation amount accounts for 5% of the total amount (volume) of the granular sludge of the system;
by controlling the internal circulation, the rising flow rate of water flow is ensured to be 2.0-2.5 m/h, the granular sludge is in a micro-expansion state, the good contact performance of methane, a substrate and microorganisms is ensured in a biological carrier region, the contact time is prolonged, and after 30-60 d, the methyloxicoccus with the MOB function accounts for more than 1% of the total amount of the system microorganisms through high-throughput sequencing, and the formation of methane oxidation is marked.
(6) Autotrophic denitrification and methane oxidation coupling, and through the steps, four functional microorganisms (MPB, AOB, AnAOB and MOB) are in single micro-aerobic granular sludgeThe reactor coexists, the removal rate of COD by the system reaches 89.5 percent, and NH is added3The N removal rate is 90.2 percent, the TN removal rate is 83.6 percent, and the methane recovery amount is 1020 mL/d.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that the above examples are not intended to limit the invention in any way and that any arrangement which is calculated to achieve the above objectives, such as variations, modifications, equivalents, or equivalent arrangements, will fall within the scope of the invention.
Claims (1)
1. A control method of anaerobic ammonia oxidation coupling methane oxidation process of a high-concentration ammonia nitrogen organic wastewater methanogenesis treatment system is characterized by comprising the following steps: the method comprises the following steps:
(1) establishing a reaction system comprises: the system comprises a water inlet adjusting tank (1), a water inlet peristaltic pump (2), an expanded granular sludge bed biomembrane reactor (16), an internal circulating pump (11) and an air compressor (12);
the expanded granular sludge bed biofilm reactor (16) comprises a main reaction zone (17) and a three-phase separator (6), and the volume ratio is 1-1.2: 1; a temperature controller (15) is arranged outside the main body reaction zone (17), a sludge bed (4) is arranged at the inner lower part of the main body reaction zone (17), and a fixed packed bed (5) is arranged at the inner top part of the main body reaction zone (17); the three-phase separator (6) is positioned at the top of the reactor, and the main reaction zone (17) and the three-phase separator (6) are both provided with a sampling port and an observation port;
(2) granular sludge culture and methanogenesis efficiency realization
The sludge bed (4) adopts sludge in a concentration tank of an urban sewage treatment plant as inoculation sludge, and the inoculation volume accounts for 20-40% of the main reaction zone (17); a fixed packed bed (5) is not arranged in the main reaction zone (17);
the COD of the inlet water is maintained at 2000-5000 mg/L, the hydraulic retention time HRT in the initial stage is controlled at 4d, the water temperature of the system is controlled at 35 +/-2 ℃ for operation, and after the operation is carried out for 30-60 d, biogas is generated; then, the HRT is gradually shortened, and granular sludge culture is carried out, namely the HRT is gradually shortened from 4d to 2d, 1d and 0.5d in a water quantity increasing mode, and the running time of each HRT is 5-7 d; at the moment, the COD removal rate is more than 92 percent, methanogen MPB is taken as the main component, and the sludge is black brown granular;
(3) micro-aerobic methane-producing granular sludge establishment
Anaerobic operation is converted into micro-aerobic operation in an aeration mode, namely DO in the reactor is controlled to be 0.2-0.3 mg/L, ORP is less than-300 mv, the operation time is 40-60 days, the color of granular sludge is changed from black brown to light yellow, the sludge concentration is 50-70 g/L, and the average particle size is 0.5-2 mm;
(4) establishment of autotrophic nitrogen removal
Ammonia nitrogen is added into inlet water, the ammonia nitrogen concentration is controlled to be 100mg/L, ammonia oxidizing bacteria AOB functional sludge and anaerobic ammonia oxidizing bacteria ANAOB functional sludge are respectively inoculated into micro-aerobic methanogenic granular sludge, and the inoculation amount accounts for 10% of the total volume of the granular sludge of the system; the removal rate of ammonia nitrogen and total nitrogen in the system reaches more than 95% and 85% respectively; then gradually increasing the ammonia nitrogen of the inlet water to 200mg/L, 300mg/L and 500mg/L, and operating each concentration gradient for 10-15 d; finally, the removal rates of ammonia nitrogen and total nitrogen are respectively more than 90% and 80%;
(5) realizing the oxidation function of methane
A fixed packed bed (5) is arranged at the top in the main body reaction zone (17), and the fixed packed bed (5) accounts for 40-60% of the volume of the main body reaction zone (17); wherein polyurethane sponge is filled in the fixed packed bed (5), and the filling rate is 40-60%;
inoculating the cultured methane-oxidizing bacteria MOB activated sludge into a fixed packed bed (5), wherein the inoculation amount accounts for 5% of the total volume of the granular sludge of the system;
by controlling the internal circulation mode, the rising flow rate of water flow is ensured to be 2.0-2.5 m/h, the granular sludge is in a micro-expansion state, in the internal circulation process, the fixed packed bed (5) ensures the contact performance of methane, a substrate and microorganisms and prolongs the contact time, and after 30-60 days, the methyloxicoccus with the MOB function accounts for more than 1% of the total amount of the system microorganisms, and the formation of methane oxidation is marked;
(6) autotrophic nitrogen removal and methane oxidation coupling
Through the steps, the four functional microorganisms MPB, AOB, AnAOB and MOB coexist in the single micro-aerobic granular sludge reaction system, the removal rates of COD, ammonia nitrogen and total nitrogen of the system are respectively up to 88%, 90% and 82%, and the methane yield is stabilized at 1000-2000 mL/d.
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