CN211644776U - PN/A integrated autotrophic nitrogen removal system based on MBBR - Google Patents
PN/A integrated autotrophic nitrogen removal system based on MBBR Download PDFInfo
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Abstract
The utility model discloses a PN/A integration autotrophic nitrogen removal system based on MBBR belongs to waste water biological nitrogen removal technical field. The device comprises a reaction tank, a stirring device, an aeration device, a gas-liquid two-phase separator, a main water inlet pipe and a main water outlet pipe, wherein the reaction tank comprises an aerobic reaction tank and an anaerobic reaction tank which are arranged from bottom to top; the aeration device is positioned at the bottom of the aerobic reaction tank, the stirring device is positioned in the anaerobic reaction tank, the gas-liquid two-phase separator is positioned in the anaerobic reaction tank and is in an inverted funnel shape, the difference between the plane diameter of a bottom gas inlet of the gas-liquid two-phase separator and the diameter of the anaerobic reaction tank is less than or equal to 1cm, and the difference between the distance between the bottom of the gas-liquid two-phase separator and the separation plate is less than or equal to 1 cm. The utility model discloses the system has effectively saved area, operation simple, impact resistance is strong.
Description
Technical Field
The utility model belongs to the technical field of the biological denitrogenation of waste water, concretely relates to autotrophic denitrogenation system of PN/A integration based on MBBR.
Background
At present, with the deep understanding of nitrogen conversion and the increase of the applicability of biological denitrification, researchers propose a new biological denitrification mode, such as partial shortcut nitrification-anaerobic ammonia oxidation (PN/A), compared with the traditional biological denitrification technology, the method has the advantages that ammonia nitrogen is oxidized into nitrite by shortcut nitrification, the oxygen requirement is saved by about 60 percent, and the energy consumption and the investment cost are effectively reduced; in the anaerobic ammonia oxidation process, ammonium salt is used as an electron donor, nitrite is used as an electron acceptor, ammonia nitrogen and nitrite are combined to form nitrogen, an additional carbon source is not needed, and the treatment cost is saved. The method has the advantages of high-efficiency treatment effect, energy consumption saving, cost reduction, sludge yield reduction and no need of an external carbon source, thereby being more and more favored.
The prior PN/A biological denitrification method is mainly divided into a 2-stage process, namely two reactions are arranged in 2 reactors to run in series, and the method has the advantages of simple operation, convenient operation, easy control of process parameters and the like, but the two reactors run separately, so that the 2-stage treatment process has the defects of large occupied area and complex process flow.
The research reports of the related aspects of the prior art mainly include:
CN102557356A discloses a semi-shortcut nitrification/anaerobic ammonia oxidation municipal sewage nitrogen and phosphorus removal process and a method, which comprises a raw water tank, an organic matter removal SBR reactor, a first regulating water tank, a semi-shortcut nitrification SBR reactor, a second regulating water tank and an autotrophic nitrogen removal UASB reactor which are sequentially connected in series. The method is provided with the short-cut nitrification/anaerobic ammonia oxidation double reactors connected in series, so that the occupied area is large.
CN103435227A discloses a SBR short-cut nitrification-SBBR anaerobic ammonia oxidation combined garbage leachate biological denitrification device and method, the device is formed by SBR (A), an integrated water tank (B) and SBBR (C) which are connected in series, the SBR reactor mainly carries out short-cut nitrification reaction, the SBBR reactor mainly carries out anaerobic ammonia oxidation reaction, leachate stock solution is firstly mixed with SBBR effluent reflux liquid and then enters the SBR for denitrification, the leachate stock solution can be diluted, a carbon source in the stock solution can be fully utilized to remove partial nitrate nitrogen in the effluent water, then the effluent of the SBR is mixed with the leachate stock solution and then enters the SBBR for anaerobic ammonia oxidation-denitrification synchronous denitrification reaction, and synchronous removal of nitrogen and COD is realized. The device is formed by connecting a plurality of reactors in series, and in practical engineering application, the defects of complex process flow and large occupied area are caused.
CN209537089U discloses a two-stage autotrophic nitrogen removal process device, which sequentially comprises a sewage storage pool, a PN reactor connected with the sewage storage pool and an AMX reactor connected with the PN reactor according to the sewage flow direction, wherein the PN reactor is subjected to short-cut nitrification to ensure that part of ammonia nitrogen is nitrified into nitrite, and effluent enters the AMX reactor for anaerobic ammonia oxidation, so that the biological autotrophic nitrogen removal is realized. The PN reactor bottom is equipped with the fan of control oxygen supply volume, still includes the regulation and control system. The device can monitor the water quality information of inlet and outlet water provided by a system and the pre-evaluation result of the process denitrification capability input periodically in real time on line, but has the defects of large occupied area in the application process, hierarchical control and the like because the two stages of reactors are connected in series.
CN103979683A introduces an integrated expanded granular sludge bed-membrane bioreactor completely autotrophic nitrogen removal device and a process thereof, the device comprises a reactor main body, a gas/liquid separation tank, a three-phase separation device, a membrane component, an air pump, an air flow meter, a perforated aeration pipe, a water inlet pump, a reflux pump, a water outlet pump and the like, the lower part of the reactor is an autotrophic nitrogen removal zone, the upper part of the reactor is a membrane filtration separation zone, sewage inlet water firstly completes nitrogen removal through a completely autotrophic nitrogen removal functional zone, and then clean outlet water is obtained through membrane filtration. The device is an integrated denitrification device, although the occupied area is saved, the autotrophic denitrification reaction is carried out by utilizing the activated sludge, the effluent water needs to be purified by a membrane separator, and the membrane separator needs to be backwashed, so that the blockage is easily caused.
The research of the prior art method discovers that: the existing high ammonia nitrogen PN/A biological denitrification device is mainly formed by connecting 2 sections of double reactors in series, has the defect of large occupied area, adopts an activated sludge system more, needs secondary sedimentation tank or membrane separation for yielding water, has the defect of large occupied area or back flushing, and urgently needs a PN/A integrated device which is simple and convenient to operate and can save the occupied area.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a PN/A integration autotrophic nitrogen removal system based on MBBR, it has effectively saved area, operation simple, impact resistance is strong.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a PN/A integrated autotrophic nitrogen removal system based on MBBR comprises a reaction tank, a stirring device, an aeration device, a gas-liquid two-phase separator, a total water inlet pipe and a total water outlet pipe, wherein the reaction tank comprises an aerobic reaction tank and an anaerobic reaction tank which are arranged from bottom to top, a separation plate is arranged between the aerobic reaction tank and the anaerobic reaction tank, a water passing port is formed in the separation plate, and an intercepting screen is arranged at the water passing port;
the aeration device is positioned at the bottom of the aerobic reaction tank;
the stirring device is positioned in the anaerobic reaction tank;
the gas-liquid two-phase separator is positioned in the anaerobic reaction tank and is in an inverted funnel shape, the difference between the plane diameter of a bottom gas inlet of the gas-liquid two-phase separator and the diameter of the anaerobic reaction tank is less than or equal to 1cm, and the difference between the distance between the bottom of the gas-liquid two-phase separator and the separation plate is less than or equal to 1 cm.
In a preferred embodiment of the present invention, the total inlet pipe is located at the bottom of the aerobic reaction tank, and the total outlet pipe is located at the upper portion of the anaerobic reaction tank.
As another preferable aspect of the present invention, the stirring device includes a submersible stirrer, and the intercepting screen is provided in plurality.
The utility model relates to a PN/A integration autotrophic nitrogen removal system's theory of operation based on MBBR does:
by utilizing the PN/A integrated autotrophic nitrogen removal system, the occupied land can be effectively saved, and the operation is simple; a gas-liquid two-phase separator is utilized to effectively separate a sewage liquid and a gas phase, and dissolved oxygen carried by a mixed liquid in the system after the mixed liquid enters an anaerobic reaction tank through an aerobic reaction tank is separated through the gas-liquid two-phase separator, so that an anaerobic/anoxic environment in the anaerobic reaction tank is ensured; the PN/A process is loaded by using the pure membrane MBBR process, so that the high-load treatment of the total nitrogen can be realized without a carbon source, functional microorganisms are enriched in the MBBR suspension carrier, a secondary sedimentation tank and a membrane separation technology are not required to be additionally arranged, the occupied area is saved, and secondary cleaning is avoided; the stirring speed of the aerobic reaction tank DO at the lower part of the integrated system and the stirring speed of the anaerobic reaction tank at the upper part of the integrated system are controlled, so that the ammonia nitrogen in the total effluent is ensured to stably reach the standard.
Compared with the prior art, the utility model discloses following beneficial technological effect has been brought:
1) the occupied area is saved, and compared with a 2-section type series reactor, the PN/A integrated autotrophic nitrogen removal system effectively saves the occupied area and reduces the investment and operation cost.
2) The system has stable control condition, and the dissolved oxygen carried by the effluent of the aerobic reaction tank can be discharged out of the system through the gas-liquid two-phase separator, so that the good anaerobic/anoxic condition of the anaerobic reaction tank is maintained.
3) Energy conservation and consumption reduction, the main denitrification process is changed from the traditional nitrification and denitrification into an autotrophic denitrification technology, 60 percent of aeration cost and 100 percent of externally added carbon source can be saved, denitrification is not limited by inlet water C/N, and the method is suitable for treating high ammonia nitrogen sewage.
4) The operation is simple, the impact resistance is strong, the PN/A integrated autotrophic nitrogen removal system is based on an MBBR process, compared with an activated sludge process, a sludge backflow and secondary sedimentation tank are not required to be arranged, compared with a fixed bed process, backwashing is not required to be carried out, the operation is simpler, and meanwhile, the system can bear the impact of water quality and water quantity for a longer time without influencing the water outlet effect due to the reinforced enrichment of the suspension carrier on functional microorganisms.
5) The system can be started successfully after 110 d.
Drawings
The present invention will be further explained with reference to the accompanying drawings:
FIG. 1 is a top view of the PN/A integrated autotrophic nitrogen removal system based on MBBR of the present invention;
in the figure, I1, total inlet pipe; i2, water outlet pipe; p, an aeration device; m, a stirring device; f, a gas-liquid two-phase separator; s, intercepting a screen mesh; c, suspending the carrier.
Detailed Description
The utility model provides a PN/A integration autotrophic nitrogen removal system based on MBBR, in order to make the utility model discloses an advantage, technical scheme are clearer and more clear, and it is right to combine specific embodiment below the utility model discloses do detailed description.
First, the related technical terms involved in the present invention are explained as follows:
1) PN/A: partial nitrification/anammox (PN/A), wherein 57% of ammonia nitrogen is consumed in the partial nitrification process, and the residual 43% of ammonia nitrogen is combined with 57% of nitrite to generate N in the anaerobic ammonia oxidation process2。
2) Autotrophic nitrogen removal: the process is a general name of nitrosation and anaerobic ammonia oxidation (ANAMMOX), so that the aim of denitrification is fulfilled; under aerobic conditions, nitrite bacteria (AOB) partially oxidize ammonia nitrogen into nitrous acid, and the generated nitrous acid and partial residual ammonia nitrogen are subjected to anaerobic ammonia oxidation (ANAMMOX) reaction under the action of anaerobic ammonia oxidizing bacteria (ANAOB) to generate nitrogen, so that systematic denitrification is realized.
3) Short-range nitration: i.e. ammonium (NH) radicals in the sewage4 +-N) Oxidation to Nitrite (NO) by AOB (Nitrospora bacteria)2 --N).
4) Anaerobic ammonia oxidation: under anaerobic/anoxic conditions, the anaerobic bacteria (Anammox) act to produce ammonium (NH) radicals4 +-N) as electron donor, Nitrite (NO)2 --N) is an electron acceptor, yielding N2The process of (1).
5) MBBR: moving Bed Biofilm Reactor (MBBR) (moving Bed Biofilm reactor), which increases biomass and biological species in a reactor by adding a certain amount of suspension carriers into the reactor, thereby increasing the treatment efficiency of the reactor;
6) filling rate: the filling rate of the suspension carrier, namely the ratio of the volume of the suspension carrier to the pool capacity of the filling area, wherein the volume of the suspension carrier is the total volume under natural accumulation; e.g. 100m3Suspending vehicle, filled to 400m3The tank capacity is 25 percent;
7) the suspension carrier, the specific gravity is 0.93-0.97, the void ratio is more than 90%, and the suspension carrier is also called suspension filler, carrier and filler for short;
8) common activated sludge: namely activated sludge in a biochemical pool of a sewage plant, and the inoculation of the sludge mainly comprises the primary acquisition of AOB strains and the accelerated biofilm formation;
9) aeration strength: aeration per unit area in m3/(m2H) including the sum of the two parts of micro-aeration and perforating aeration; for example, the aeration rate of the micropores is 10m3H, perforation aeration rate of 5m3H, the bottom area of the reactor is 5m2The aeration intensity is (10+ 5)/5-3 m3/(m2·h)；
10) TN removal of volume load: the mass of TN removed per unit volume of reaction cell per day, kgN/(m)3D); if the volume load of the PN/A reaction tank TN removal is equal to (the water inlet TN concentration of the PN/A reaction tank-the water outlet TN concentration of the PN/A reaction tank)/PN/A reaction tank total tank volume and the daily water inlet volume of the aerobic reaction tank.
11) Volumetric load of ammonia oxidation: the ratio of the total ammonia nitrogen amount of the oxidized ammonia nitrogen of the inlet water after the inlet water is subjected to aerobic conditions to the total ammonia nitrogen amount of the inlet water is percent; if the ammonia nitrogen oxidation rate of the aerobic reaction tank is equal to (the ammonia nitrogen concentration of the inlet water of the aerobic reaction tank-the ammonia nitrogen concentration of the inlet water of the anaerobic reaction tank) ÷ the volume of the aerobic reaction tank and the daily inlet water volume of the aerobic reaction tank;
12) TN removal of surface load: the mass of total nitrogen per unit of effective specific surface area of the filler removed per day, gN/(m)2D); if the inlet water TN is 500mg/L, the outlet water TN is 100mg/L, and the inlet water flow is 10m3D, biofilm area 2000m2If the surface load of TN removed is (500-2·d)；
The aeration device P mentioned in the utility model is an aeration pipe, and the structure and the using method thereof can be realized by referring to the prior art.
The stirring device M of the utility model, the structure and the application method thereof can be realized by using the prior art for reference.
As shown in figure 1, the utility model relates to a PN/A integration autotrophic nitrogen removal system based on MBBR, it includes reaction tank, agitating unit, aeration equipment, gas-liquid double-phase separator F, total inlet tube I1 and total outlet pipe I2.
As the main improvement point of the utility model, the above-mentioned reaction tank includes aerobic reaction tank and the anaerobic reaction tank of arranging from bottom to top, and the reaction tank among the prior art is generally the mode of arranging side by side, the utility model discloses arrange the anaerobic reaction tank on aerobic reaction tank, can further reduce its area.
Preferably, the aerobic reaction tank and the anaerobic reaction tank have the same tank volume, a partition plate is arranged between the aerobic reaction tank and the anaerobic reaction tank, a water passing port is formed in the partition plate, and a plurality of intercepting screens S are arranged at the water passing port, so that the effect of intercepting the suspended carriers C in the intercepting screens S is achieved;
the aeration device is positioned at the bottom of the aerobic reaction tank, for example, an aeration pipe is laid at the bottom of the aerobic reaction tank;
the stirring device is positioned in the anaerobic reaction tank, and if a plurality of groups of submersible stirrers are arranged;
the gas-liquid two-phase separator is positioned in the anaerobic reaction tank and is in an inverted funnel shape, the difference between the plane diameter of a bottom gas inlet of the gas-liquid two-phase separator and the diameter of the anaerobic reaction tank is less than or equal to 1cm, and the difference between the distance between the bottom of the gas-liquid two-phase separator and the separation plate is less than or equal to 1cm, so that water in the aerobic reaction tank flows into the anaerobic reaction tank through the interception screen and the water passing hole after flowing out, and gas generated by nitration reaction in the aerobic reaction tank is discharged out of the system through the gas-liquid two-phase separator:
the total water inlet pipe is positioned at the bottom of the aerobic reaction tank, the total water outlet pipe is positioned at the upper part of the anaerobic reaction tank, and system inlet water flows through the anaerobic reaction tank from the aerobic reaction tank and is discharged from the total water outlet pipe at the upper part of the anaerobic reaction tank.
The method for rapidly starting the PN/a integrated autotrophic nitrogen removal system based on MBBR will be described in detail below.
The method comprises the following specific steps:
a. starting preparation, namely adding a suspension carrier into an aerobic reaction tank and an anaerobic reaction tank, wherein the filling rate is 20-67%; inoculating common activated sludge in the aerobic reaction tank and the anaerobic reaction tank, wherein the sludge concentration in the aerobic reaction tank and the anaerobic reaction tank is 3-5g/L after inoculation;
b. nitrosation is started, DO of the aerobic reaction tank is controlled to be 1.5-3.0mg/L, and the aeration intensity is controlled>4m3/(m2H); controlling the rotating speed of a stirring device in the anaerobic reaction tank to be 20-30r/min, and continuously feeding water to gradually drain the sludge in the aerobic reaction tank and the anaerobic reaction tank until the sludge concentration in the aerobic reaction tank and the anaerobic reaction tank<0.5g/L, continuously running until the ammonia oxidation volume load in the aerobic reaction tank>1.0kgN/(m3D), go to the next step;
c. starting anaerobic ammonia oxidation, inoculating mature anaerobic ammonia oxidation suspension carriers into an anaerobic reaction tank, wherein the inoculation rate is 3-5%, and continuously feeding water into an aerobic reaction tank; controlling DO in the aerobic reaction tank to be 0.5-2.0mg/L and controlling aeration intensity>2.0m3/(m2H); controlling the rotating speed of the stirring device to be 20-30r/min by the anaerobic reaction tank; run until the TN of the system removes the volume load>1.0kgN/(m3D), go to the next step;
d. PN/A stably operates, water is continuously fed, DO in an aerobic reaction tank is controlled to be 2.0-4.0mg/L, and the aeration intensity is controlled>5m3/(m2H), controlling the rotating speed of the stirring device by the anaerobic reaction tank to be 30-45r/min, and discharging the effluent water through a main water outlet pipe.
Example 1:
the ammonia nitrogen and COD in the inlet water of a certain integrated device are respectively 450mg/L and 320mg/L, and the water quantity is 300m3D, adopting a PN/A integrated autotrophic nitrogen removal system based on MBBR to carry out treatment, wherein the total volume of the device is 60m3Suspension carriers are added into the aerobic reaction tank and the anaerobic reaction tank, and the filling rate is 45 percent; inoculating common activated sludge in the aerobic reaction tank and the anaerobic reaction tank, inoculating the common activated sludge in the aerobic reaction tank and the anaerobic reaction tank, and then inoculating the common activated sludge in the aerobic reaction tank and the anaerobic reaction tank to the aerobic reaction tankThe sludge concentration in the anaerobic reaction tank is 4 g/L; controlling DO of the aerobic reaction tank to be 2.3mg/L and controlling the aeration intensity to be 4.7m3/(m2H), controlling the rotating speed of a stirring device in the anaerobic reaction tank to be 25r/min, ensuring the fluidization of activated sludge and suspended carriers in an aerobic reaction tank at the lower part of the device by aeration when inflow water flows from bottom to top, ensuring the fluidization of the activated sludge and the suspended carriers in an anaerobic reaction tank at the upper part of the device by stirring, gradually losing the sludge in the aerobic and anaerobic reaction tanks by a rapid sludge discharge method until the sludge concentration in the aerobic and anaerobic reaction tanks is 0.2g/L, and operating until the ammonia oxidation volume load in the aerobic reaction tank is 1.7kgN/(m & ltn & gt)3D); inoculating mature anaerobic ammonium oxidation suspension carrier into an anaerobic reaction tank, wherein the inoculation rate is 4%, continuously feeding water into an aerobic reaction tank, controlling DO in the aerobic reaction tank to be 0.8mg/L, and the aeration intensity to be 2.7m3/(m2H), controlling the rotating speed of a stirring device in the anaerobic reaction tank to be 28 r/min; the TN removal volumetric load from run 101d to the plant was 1.5 kgN/(m)3D); the aerobic reaction tank continuously feeds water, the rotating speed of the stirring device is controlled to be 40r/min by the anaerobic reaction tank, the DO of the aerobic reaction tank is controlled to be 3.4mg/L, and the aeration intensity is 5.9m3/(m2H), the ammonia nitrogen concentration and the COD concentration of the effluent of the anaerobic reaction tank of the integrated system are respectively 30mg/L and 150mg/L, and the effluent is discharged through a main water outlet pipe.
Example 2:
in a certain integrated device, suspension carriers are added into an aerobic reaction tank and an anaerobic reaction tank, and the filling rate is 38%; ordinary activated sludge is inoculated in the aerobic reaction tank and the anaerobic reaction tank, and the sludge concentration in the aerobic reaction tank and the anaerobic reaction tank is 3.9g/L after inoculation; controlling DO in the aerobic reaction tank to be 2.1mg/L and the aeration intensity to be 4.2m3/(m2H); controlling the rotating speed of a stirring device in the anaerobic reaction tank to be 23r/min, ensuring the fluidization of activated sludge and suspended carriers in an aerobic reaction tank at the lower part of the device by aeration from bottom to top, ensuring the fluidization of the activated sludge and suspended carriers in an anaerobic reaction tank at the upper part of the device by stirring, gradually losing the sludge in the aerobic and anaerobic reaction tanks by a rapid sludge discharge method until the sludge concentration in the aerobic and anaerobic reaction tanks is 0.37g/L, and running until the ammonia oxidation volume load in the aerobic reaction tank is 1.6 kgN/(C/L)m3D); inoculating mature anaerobic ammonium oxidation suspension carrier into an anaerobic reaction tank, wherein the inoculation rate is 4.1%, continuously feeding water into an aerobic reaction tank, controlling DO in the aerobic reaction tank to be 0.9mg/L, and the aeration intensity to be 3.1m3/(m2H), controlling the rotating speed of a stirring device by the anaerobic reaction tank to be 30 r/min; the TN removal volumetric load from run 101d to the plant was 2.1 kgN/(m)3D); the aerobic reaction tank continuously feeds water, the rotating speed of the stirring device is controlled to be 43r/min by the anaerobic reaction tank, the DO of the aerobic reaction tank is controlled to be 3.7mg/L, and the aeration intensity is 6.21m3/(m2H), discharging the effluent of the anaerobic reaction tank of the integrated system through a main water outlet pipe.
The parts not mentioned in the utility model can be realized by adopting or referring to the prior art.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (3)
1. The utility model provides a PN/A integration autotrophic nitrogen removal system based on MBBR, its includes reaction tank, agitating unit, aeration equipment, gas-liquid two-phase separator, total inlet tube and total outlet pipe, its characterized in that:
the reaction tank comprises an aerobic reaction tank and an anaerobic reaction tank which are arranged from bottom to top, a separation plate is arranged between the aerobic reaction tank and the anaerobic reaction tank, a water passing port is arranged on the separation plate, and an intercepting screen is arranged at the water passing port;
the aeration device is positioned at the bottom of the aerobic reaction tank;
the stirring device is positioned in the anaerobic reaction tank;
the gas-liquid two-phase separator is positioned in the anaerobic reaction tank and is in an inverted funnel shape, the difference between the plane diameter of a bottom gas inlet of the gas-liquid two-phase separator and the diameter of the anaerobic reaction tank is less than or equal to 1cm, and the difference between the distance between the bottom of the gas-liquid two-phase separator and the separation plate is less than or equal to 1 cm.
2. The MBBR-based PN/A integrated autotrophic nitrogen removal system according to claim 1, wherein: the total water inlet pipe is positioned at the bottom of the aerobic reaction tank, and the total water outlet pipe is positioned at the upper part of the anaerobic reaction tank.
3. The MBBR-based PN/A integrated autotrophic nitrogen removal system according to claim 2, wherein: the stirring device comprises a submersible stirrer.
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| CN111115822B (en) * | 2020-01-20 | 2023-11-21 | 青岛思普润水处理股份有限公司 | PN/A integrated autotrophic nitrogen removal system based on MBBR and quick starting method |
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