CN111422983A - Two-stage sewage treatment device and process of shortcut nitrification-anaerobic ammonia oxidation - Google Patents
Two-stage sewage treatment device and process of shortcut nitrification-anaerobic ammonia oxidation Download PDFInfo
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Abstract
The invention discloses a shortcut nitrification-anaerobic ammonia oxidation two-stage sewage treatment device, which comprises a chemically enhanced first-stage treatment reaction device, a shortcut nitrification MBBR reactor and an anaerobic ammonia oxidation UASB reactor; the municipal domestic sewage after the primary treatment enters a chemical enhanced primary treatment system for treatment to remove most organic matters and total phosphorus, and then is subjected to stable short-cut nitrification by an MBBR (moving bed biofilm reactor) controlled by an automatic control system to remove about 50 percent of NH4 +Conversion of-N to NO2 ‑N, simultaneously removing most organic matters in the sewageThen the mixture is subjected to anaerobic ammonia oxidation reaction in an anaerobic ammonia oxidation UASB reactor, and NO is utilized under the action of anaerobic ammonia oxidation bacteria2 ‑-N is an electron acceptor to NH4 +N is converted into nitrogen to achieve the purpose of deep denitrification. The two-stage sewage treatment device and the process provided by the invention can save a large amount of energy in the whole process flow, realize high-efficiency denitrification of urban domestic sewage, and provide a low-consumption and effective process mode for treating the urban domestic sewage.
Description
Technical Field
The invention relates to a shortcut nitrification-anaerobic ammonia oxidation two-stage sewage treatment device and a shortcut nitrification-anaerobic ammonia oxidation two-stage sewage treatment process, belongs to the technical field of sewage treatment, and is suitable for a main stream treatment system of urban domestic sewage.
Background
With the continuous improvement of urban development speed in China, the problem of water pollution caused by the substandard discharge of urban domestic sewage is continuously aggravated. The nitrification-denitrification biological nitrogen removal process used in the traditional urban domestic sewage treatment process needs to additionally add a large amount of carbon sources, has the defects of high energy consumption, inconvenient operation and the like, is difficult to completely meet the development requirements of the resource-saving society, and the novel biological nitrogen removal technology represented by anaerobic ammonia oxidation becomes a hotspot of the research of the international water treatment field. The anaerobic ammonia oxidation is to utilize CO in anaerobic condition2As a carbon source, Nitrite (NO) is used2 --N) as electron acceptor to convert Ammonia Nitrogen (NH)4 +-N) into nitrogen (N)2). Almost NO NO is contained in the urban domestic sewage2 -N, so that the application of anammox to municipal sewage treatment must find a stable access to NO2 --N pathway. Commonly used to obtain stable NO2 -the-N method adopts short-cut nitrification, namely utilizes the difference of the physiological characteristics of Ammonia-oxidizing Bacteria (AOB) and Nitrite-oxidizing Bacteria (NOB), combines reaction condition control, promotes the growth of the AOB and inhibits the growth of the NOB, and approximately 50-60 percent of NH in the wastewater4 +Oxidation of-N to NO2 --N and blocking NO2 -Further oxidation of-N. However, urban domestic sewage has the characteristics of low water temperature, large water quantity, strong water quality fluctuation, low ammonia nitrogen concentration, difficulty in providing free ammonia concentration capable of effectively inhibiting the activity of NOB and the like, so that the NOB often dominates in competition with AOB, and short-cut nitrification is difficult to realize. Therefore, the stable control of shortcut nitrification is a major bottleneck in order to incorporate the anaerobic ammonium oxidation process into the mainstream municipal sewage treatment system. In addition, a certain amount of organic matters in the municipal domestic sewage can inhibit the anammox bacteria, and the factor also limits the application of the anammox process in the municipal domestic sewage treatment.
Researchers have found in studies of the control strategy of both AOB and NOB nitrifying bacteria during the shortcut nitrification process that AOB is responsible for O relative to NOB2Has better affinity, and can reduce NOB utilization O by limiting DO2Thereby inhibiting its potential for NO2 -Further oxidation of N, where the DO limit is often in terms of DO/NH4 +-the value of N. Research shows that when the control method is used for carrying out short-cut nitrification on the synthetic ammonia nitrogen wastewater without organic carbon, DO/NH is carried out4 +Good effect is achieved when-N is less than 0.1, but when the urban domestic sewage is applied under the same control condition, although nitrification of ammonia nitrogen is observed to occur at the rate of approximately 60%, NO is not observed2 --accumulation of N.
Disclosure of Invention
The purpose is as follows: in order to solve the problems that the shortcut nitrification is difficult to stably control and the organic matter content of the municipal domestic sewage is too high to inhibit the anaerobic ammonia oxidation reaction in the process of incorporating the anaerobic ammonia oxidation technology into the mainstream treatment of the municipal domestic sewage, the invention provides a shortcut nitrification-anaerobic ammonia oxidation two-stage sewage treatment device and a shortcut nitrification-anaerobic ammonia oxidation two-stage sewage treatment process.
Research shows that a certain NOB inhibition effect can be obtained by controlling the concentration of Free Ammonia (FA), and according to the influence effect of pH on Free Ammonia, when the pH is increased, Ammonia nitrogen in water can be converted into Free Ammonia, and the pH is continuously reduced in the process of short-cut nitrification of municipal biological sewage, so that a proper amount of Free Ammonia concentration can be obtained by controlling the pH so as to inhibit the activity of NOB.
The Moving Bed Biofilm Reactor (MBBR) integrates the advantages of an activated sludge process and a Biofilm process, wherein the added suspension carrier can form conditions of anaerobic bacteria growing inside and aerobic bacteria attached outside, the oxygen utilization efficiency is greatly improved under the lifting action of aeration and water flow, and conditions are provided for realizing stable shortcut nitrification while the removal effect of organic matters is improved. A three-phase separator in an Up-flow Anaerobic sludge bed Reactor (UASB) has high-efficiency interception effect on Anaerobic ammonia oxidation bacteria, so that the conversion rate of Anaerobic ammonia oxidation reaction can be greatly improved.
Based on the method, a combination form of a short-cut nitrification MBBR reactor and an anaerobic ammonia oxidation UASB reactor in series is adopted, wherein a chemically enhanced primary treatment reaction device is arranged in front of the short-cut nitrification MBBR reactor to reduce the burden of subsequent biological treatment; by DO/NH4 +The N automatic control system and the pH automatic control system control reaction conditions required by short-cut nitrification to realize stable short-cut nitrification, and the optimal range of control parameters is determined by parameter debugging experiments; finally, the advanced denitrification is realized through an anaerobic ammonia oxidation UASB reactor.
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a two-stage sewage treatment device of short-cut nitrification-anaerobic ammonia oxidation comprises a chemically enhanced first-stage treatment reaction tank, a sedimentation tank, a short-cut nitrification MBBR reactor, a sedimentation device, an intermediate water tank and an anaerobic ammonia oxidation UASB reactor;
the chemical strengthening primary treatment reaction tank is connected with a sedimentation tank, a coagulant adding device is arranged above the chemical strengthening primary treatment reaction tank, and a sludge discharge port is arranged below the sedimentation tank;
the sedimentation tank is connected with the short-cut nitrification MBBR reactor through a first water inlet pump, and a water outlet pipe of the short-cut nitrification MBBR reactor is connected with a sedimentation device; the bottom of the short-cut nitrification MBBR reactor is provided with a micropore aeration device, and the short-cut nitrification MBBR reactor is also provided with a short-cut nitrification automatic control system; a sludge discharge pump is arranged below the sedimentation device;
a water outlet pipe of the sedimentation device is connected with the middle water tank; the middle water tank is connected with the anaerobic ammonia oxidation UASB reactor through a second water inlet pump, and a reflux pump is arranged on one side of the anaerobic ammonia oxidation UASB reactor to carry out sludge internal circulation.
Furthermore, the cylindrical HDPE filler carrier is filled in the microporous aeration device, and the filling rate is 40%.
Further, the shortcut nitrification automatic control system comprises DO/NH4 +-N automatic control system and pH automatic control system.
Further, said DO/NH4 +The N automatic control system consists of a programmable logic controller, an ammonia nitrogen sensor, a dissolved oxygen sensor and an air pump, wherein the air pump is connected with the microporous aeration device; the ammonia nitrogen sensor and the dissolved oxygen sensor are connected with the input end of the programmable logic controller, and the output end of the programmable logic controller is connected with the air pump; the pH automatic control system comprises a programmable logic controller, a pH sensor and an alkali adding device, wherein the pH sensor is connected with the input end of the programmable logic controller, and the alkali adding device is connected with the output end of the programmable logic controller; the DO/NH4 +The programmable logic controllers of the-N automatic control system and the pH automatic control system are the same.
Further, anaerobic ammonia oxidation UASB reactor top is equipped with three-phase separator and delivery port, and the side is equipped with the sample connection.
A two-stage sewage treatment process of shortcut nitrification-anaerobic ammonia oxidation is carried out by utilizing the device, and specifically comprises the following steps:
1) the urban domestic sewage is treated by a chemical enhanced primary treatment reaction tank and a sedimentation tank to remove most suspended solids, total phosphorus and organic matters, then enters a short-cut nitrification MBBR reactor, and the reaction time is controlled by adjusting a first water inlet pumpFor 8-10h, adopting DO/NH4 +The control condition combining the-N automatic control and the pH automatic control is monitored on line in real time by a dissolved oxygen sensor and an ammonia nitrogen sensor, and DO/NH in the short-cut nitrification MBBR reactor is controlled by a micropore aeration device4 +-N is controlled at 0.08+Within 0.02 range, the pH sensor is used for real-time on-line monitoring, the pH in the short-cut nitrification MBBR reactor is controlled within 8.5-8.9 range by the alkali adding device, stable short-cut nitrification is realized, and about 50 percent of NH in the inlet water is added4 +Conversion of-N to NO2 -N-NH in the effluent during steady operation4 +-N/NO2 --N is close to 1: 1;
2) the sewage treated by the short-cut nitrification MBBR reactor is subjected to mud-water separation by a precipitation device, the residual sludge is discharged by a sludge discharge pump, the effluent of the upper layer of the precipitation device enters an intermediate water tank and is pumped into an anaerobic ammonia oxidation UASB reactor by a second water inlet pump, and anaerobic ammonia oxidation bacteria are utilized to carry out NO treatment under the anoxic condition2 --N is an electron acceptor to NH4 +N is converted into nitrogen to further reduce total nitrogen, internal circulation of sludge is carried out through an internal reflux pump, the reaction time is controlled to be about 8 hours by adjusting the pump speed of a second water inlet pump, and effluent is discharged through a water outlet.
Has the advantages that: compared with the prior art, the two-stage sewage treatment device and the two-stage sewage treatment process of shortcut nitrification-anaerobic ammonia oxidation provided by the invention have the following advantages:
1) DO/NH is carried out on the short-cut nitrification MBBR by adopting a real-time online detection and automatic control system4 +N and pH control, namely adjusting aeration quantity according to the ammonia nitrogen concentration of inlet water, controlling pH to improve the concentration of free ammonia, well inhibiting the activity of NOB, realizing stable shortcut nitrification and providing a stable matrix for subsequent anaerobic ammonia oxidation;
2) the anaerobic ammonia oxidation UASB reactor is provided with a three-phase separator and an internal reflux device, so that the high-efficiency interception of anaerobic ammonia oxidation bacteria can be realized, the concentration of the anaerobic ammonia oxidation bacteria in the reactor is maintained at a higher level, and the anaerobic ammonia oxidation conversion rate is effectively improved;
3) the two reaction processes of short-cut nitrification and anaerobic ammonia oxidation are separated by adopting a short-cut nitrification-anaerobic ammonia oxidation two-stage process, so that poor competition between dominant strains in the two reaction processes is avoided, most organic matters in sewage are removed by the short-cut nitrification MBBR reactor, a good living environment is provided for anaerobic ammonia oxidation bacteria, and the anaerobic ammonia oxidation efficiency is greatly improved.
Drawings
FIG. 1 is a schematic structural diagram of a two-stage sewage treatment device of short-cut nitrification-anaerobic ammonia oxidation provided by the invention.
Reference numerals: 1. the system comprises a chemical strengthening primary treatment reaction tank, 11, a water inlet, 12, a coagulant adding device, 2, a sedimentation tank, 21, a first water inlet pump, 22, a sludge discharge port, 3, a short-cut nitrification MBBR reactor, 31, a micropore aeration device, 32, a programmable logic controller, 33, an ammonia nitrogen sensor, 34, a pH sensor, 35, a dissolved oxygen sensor, 36, an alkali adding device, 37, an air pump, 4, a sedimentation device, 41, a sludge discharge pump, 5, an intermediate water tank, 51, a second water inlet pump, 6, an anaerobic ammonia oxidation UASB reactor, 61, a three-phase separator, 62, a reflux pump, 63, a sampling port and 64 a water outlet.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
A two-stage sewage treatment device of shortcut nitrification-anaerobic ammonia oxidation comprises a chemically enhanced first-stage treatment reaction tank 1, a sedimentation tank 2, a shortcut nitrification MBBR reactor 3, a sedimentation device 4, an intermediate water tank 5 and an anaerobic ammonia oxidation UASB reactor 6. The chemical strengthening primary treatment reaction tank 1 is connected with the sedimentation tank 2, one side of the chemical strengthening primary treatment reaction tank 1 is provided with a water inlet 11, a coagulant adding device 12 is arranged above the chemical strengthening primary treatment reaction tank 1, a coagulant is added into the chemical strengthening primary treatment reaction tank 1 through the coagulant adding device 12, a sludge discharge port 22 is arranged below the sedimentation tank 2, and sludge in the sedimentation tank 2 is discharged through the sludge discharge port 22.
The sedimentation tank 2 is connected with the short-cut nitrification MBBR reactor 3 through a first water inlet pump 21, the bottom of the short-cut nitrification MBBR reactor 3 is provided with a micropore aeration device 31, and a cylindrical HDPE filler carrier is filled in the micropore aeration device 31Specific surface area 400 m2/m3And the filling rate is 40%. The short-cut nitrification MBBR reactor 3 is also provided with a short-cut nitrification automatic control system, and the short-cut nitrification automatic control system comprises DO/NH4 +-N automatic control system and pH automatic control system. The DO/NH4 +the-N automatic control system consists of a programmable logic controller (P L C) 32, an ammonia nitrogen sensor 33, a dissolved oxygen sensor 35 and an air pump 37, wherein the air pump 37 is connected with the micro-pore aeration device 31, the ammonia nitrogen sensor 33 and the dissolved oxygen sensor 35 are connected with the input end of the programmable logic controller (P L C) 32, the ammonia nitrogen concentration and the dissolved oxygen value which are monitored in real time are transmitted to the P L C, and the output end of the programmable logic controller (P L C) 32 is connected with the air pump 37, so that the micro-pore aeration device 31 is controlled to ensure DO/NH in the short-cut nitrification MBBR reactor4 +The value of N is in an optimal range, the pH automatic control system comprises a programmable logic controller (P L C) 32, a pH sensor 34 and an alkali adding device 36, the pH sensor 34 is connected with the input end of the programmable logic controller (P L C) 32 and transmits the pH value monitored in real time to P L C, the alkali adding device 36 is connected with the output end of the programmable logic controller (P L C) 32, the P L C controls the alkali adding device to control the pH value in the short-cut nitrification MBBR reactor 3 to be in the optimal range, and the DO/NH4 +The programmable logic controllers 32 of the-N automatic control system and the pH automatic control system are the same.
A water outlet pipe of the short-cut nitrification MBBR reactor 3 is connected with the sedimentation device 4, and a sludge discharge pump 41 is arranged below the sedimentation device 4; the water outlet pipe of the sedimentation device 4 is connected with the middle water tank 5. The intermediate water tank 5 is connected with an anaerobic ammonia oxidation UASB reactor 6 through a second water inlet pump 51, and a reflux pump is arranged on one side of the anaerobic ammonia oxidation UASB reactor 6 for internal circulation of sludge; a three-phase separator 61 and a water outlet 64 are arranged above the anaerobic ammonia oxidation UASB reactor 6, and a sampling port 63 is arranged on the side edge.
The sewage treatment example:
the test water is taken from effluent of a municipal domestic sewage treatment plant after primary treatment, and the water quality is as follows, wherein the COD concentration is 100 mg/L-150 mg/L, the concentration is 40 mg/L-50 mg/L, the concentration is 4-6 mg/L, the experiment adopts a reaction device shown in figure 1, the effective volume of a short-cut nitrification MBBR reactor is 50L, the effective volume of an anaerobic ammonia oxidation UASB reactor is 20L, and the two used materials are organic glass.
The specific operation process is as follows:
in the starting stage, the shortcut nitrification MBBR reactor 3 is subjected to biofilm formation starting by using return sludge of a nitrification reactor of a sewage treatment plant, the sludge concentration in the reactor is 3000-4000 mg/L, the dissolved oxygen is controlled to be 3-5 mg/L, the hydraulic retention time is about 12 hours, the successful starting of the shortcut nitrification MBBR reactor is indicated when the removal rate of ammonia nitrogen in water is detected to be more than 60 percent, the anaerobic ammonia oxidation UASB reactor 6 is inoculated with anaerobic ammonia oxidation granular sludge, the DO concentration is controlled to be close to 0 mg/L, and NH configured in a laboratory is used4 +-N/NO2 -And (3) cultivating and domesticating the anaerobic ammonia oxidation granular sludge by using a matrix solution with-N close to 1:1, wherein the removal rate of TN (total nitrogen) of effluent reaches about 70%, which indicates that the anaerobic ammonia oxidation UASB reactor is successfully debugged.
Parameter debugging: determining control parameters of the short-cut nitrification MBBR reactor 3 which is successfully started by biofilm formation, and determining DO/NH4 +when-N is set to be about 0.08, the ammonia nitrogen removal rate in the effluent of the short-cut nitrification MBBR reactor reaches 50-60% after the operation for a period of time, but NO in the effluent reaches2 -The content of-N is very low, so that other parameters are controlled to be unchanged, the pH value in the reactor is increased, and NO in effluent water is reduced2 -the-N is increased remarkably, and NH in the effluent water is increased when the pH value is increased to 8.5-8.94 +-N/NO2 -the-N is close to 1:1, and stable short-cut nitrification is realized.
In the operation stage, after the system is debugged and stably operated, municipal domestic sewage firstly passes through a chemical strengthening primary treatment reaction tank 1, a proper amount of coagulant is added through a coagulant adding device 12, then is subjected to coagulating sedimentation in a sedimentation tank 2 to remove a large amount of suspended solids, total phosphorus and organic matters, effluent enters a short-cut nitrification MBBR reactor 3, the concentration of ammonia nitrogen and dissolved oxygen in the reactor is monitored in real time, the numerical value is transmitted to P L C, and the aeration quantity of a microporous aeration device is controlled by controlling an air pump through the P L C so as to carry out DO/NH4 +-N ratioThe value is kept in the optimum range of short-cut nitrification of 0.08+0.02, the pH value in the reactor is monitored in real time, the value is transmitted to P L C, the pH value of P L C is maintained in the optimal range of 8.5-8.9 of short-cut nitrification by controlling an alkali adding device, the reaction condition is controlled to be the condition required by the short-cut nitrification by a short-cut nitrification automatic control system, the reaction time is 8-10h, and partial NH in the wastewater is treated by the short-cut nitrification4 +Conversion of-N to NO2 -And N, the effluent enters the sedimentation device 4, the excess sludge is discharged through a sludge discharge pump 41 below the sedimentation device 4, and the effluent at the upper layer enters the intermediate water tank 5. The water in the middle water tank is pumped into an anaerobic ammonia oxidation UASB reactor 6 by a second water outlet pump 51, the anaerobic ammonia oxidation bacteria utilize NO in the wastewater under anoxic conditions in the reactor2 --N is an electron acceptor to NH4 +Conversion of-N to N2And further reducing the total nitrogen, wherein the reaction time is 8h, the gas passes through a three-phase separator 61 at the upper end of the anaerobic ammonia oxidation UASB reactor after the reaction, the gas is discharged through an exhaust port, the sludge is subjected to internal circulation through a reflux pump 62, and the effluent is discharged through a water outlet 64.
Test results show that the system runs stably, and the COD of the effluent is 30-40 mg/L4 +The concentration of-N is 2.5-3.5 mg/L3 -The N concentration is 2-4 mg/L and is lower than 12 mg/L and is lower than 0.5 mg/L, the denitrification effect is stable, and the treated water quality reaches the first-class A standard of pollutant discharge Standard of urban Sewage treatment plant (GB 18918-.
The device and the method for stable short-cut nitrification-anaerobic ammonia oxidation two-stage treatment of the municipal domestic sewage, which are provided by the invention, can effectively overcome the problem that anaerobic ammonia oxidation is applied to a municipal domestic sewage mainstream treatment system, and have good development and application prospects in the field of biological denitrification of municipal domestic sewage treatment.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (6)
1. A two-stage sewage treatment device of shortcut nitrification-anaerobic ammonia oxidation is characterized in that: comprises a chemical strengthening primary treatment reaction tank (1), a sedimentation tank (2), a short-cut nitrification MBBR reactor (3), a sedimentation device (4), an intermediate water tank (5) and an anaerobic ammonia oxidation UASB reactor (6);
the chemical strengthening primary treatment reaction tank (1) is connected with the sedimentation tank (2), a coagulant adding device (12) is arranged above the chemical strengthening primary treatment reaction tank (1), and a sludge discharge port (22) is arranged below the sedimentation tank (2);
the sedimentation tank (2) is connected with the short-cut nitrification MBBR reactor (3) through a first water inlet pump (21), and a water outlet pipe of the short-cut nitrification MBBR reactor (3) is connected with the sedimentation device (4); the bottom of the short-cut nitrification MBBR reactor (3) is provided with a micropore aeration device (31), and the short-cut nitrification MBBR reactor (3) is also provided with a short-cut nitrification automatic control system; a sludge pump (41) is arranged below the sedimentation device (4);
a water outlet pipe of the sedimentation device (4) is connected with the middle water tank (5); middle water tank (5) link to each other with anammox UASB reactor (6) through second intake pump (51), anammox UASB reactor (6) one side sets up backwash pump (62), carries out the mud inner loop.
2. The two-stage sewage treatment plant of shortcut nitrification-anaerobic ammonia oxidation according to claim 1, characterized in that: the microporous aeration device (31) is internally filled with cylindrical HDPE filler carriers, and the filling rate is 40%.
3. The two-stage sewage treatment plant of shortcut nitrification-anaerobic ammonia oxidation according to claim 1, characterized in that: the automatic control system for short-cut nitrification comprises DO/NH4 +-N automatic control system and pH automatic control system.
4. The two-stage sewage treatment plant of shortcut nitrification-anaerobic ammonia oxidation according to claim 3, characterized in that: the DO/NH4 +The N automatic control system consists of a programmable logic controller (32), an ammonia nitrogen sensor (33), a dissolved oxygen sensor (35) and an air pump (37), wherein the air pump (37) is connected with the micropore aeration device (31); the ammonia nitrogen sensor (33) and the dissolved oxygen sensor (35) are connected with the input end of the programmable logic controller (32), and the output end of the programmable logic controller (32) is connected with the air pump (37); the pH automatic control system comprises a programmable logic controller (32), a pH sensor (34) and an alkali adding device (36), wherein the pH sensor (34) is connected with the input end of the programmable logic controller (32), and the alkali adding device (36) is connected with the output end of the programmable logic controller (32); the DO/NH4 +-the programmable logic controllers (32) of the N automatic control system and the pH automatic control system are the same.
5. The two-stage sewage treatment plant of shortcut nitrification-anaerobic ammonia oxidation according to claim 1, characterized in that: a three-phase separator (61) and a water outlet (64) are arranged above the anaerobic ammonia oxidation UASB reactor (6), and a sampling port (63) is arranged on the side edge.
6. A two-stage sewage treatment process of shortcut nitrification-anaerobic ammonia oxidation is characterized in that: the method is carried out by using the device of any one of claims 1 to 5, and specifically comprises the following processes:
1) the urban domestic sewage is treated by a chemical enhanced primary treatment reaction tank (1) and a sedimentation tank (2) to remove most suspended solids, total phosphorus and organic matters, then enters a short-cut nitrification MBBR reactor (3), is controlled for reaction time of 8-10 hours by adjusting a first water inlet pump (21), and adopts DO/NH4 +The control condition of the combination of-N automatic control and pH automatic control is monitored on line in real time by a dissolved oxygen sensor (35) and an ammonia nitrogen sensor (33), and DO/NH in the short-cut nitrification MBBR reactor (3) is controlled by a micropore aeration device (31)4 +-N is controlled at 0.08+Within 0.02 range, is monitored on line in real time by a pH sensor (34),the pH value in the short-cut nitrification MBBR reactor (3) is controlled within the range of 8.5-8.9 by an alkali adding device (36), stable short-cut nitrification is realized, and about 50 percent of NH is added into the water4 +Conversion of-N to NO2 -N-NH in the effluent during steady operation4 +-N/NO2 --N is close to 1: 1;
2) sewage treated by the short-cut nitrification MBBR reactor is subjected to mud-water separation by a precipitation device (4), residual sludge is discharged by a sludge discharge pump (41), effluent water at the upper layer of the precipitation device (4) enters an intermediate water tank (5), is pumped into an anaerobic ammonia oxidation UASB reactor (6) by a second water inlet pump (51), and anaerobic ammonia oxidation bacteria are utilized to carry out NO treatment under the anoxic condition2 --N is an electron acceptor to NH4 +N is converted into nitrogen to further reduce total nitrogen, internal circulation of sludge is carried out through an internal reflux pump (63), the reaction time is controlled to be about 8 hours by adjusting the pump speed of a second water inlet pump (51), and effluent is discharged through a water outlet (64).
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| CN115557643A (en) * | 2022-10-18 | 2023-01-03 | 威海智洁环保技术有限公司 | Urban domestic sewage treatment system and resource utilization method |
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