CN102198978A - Apparatus for realizing short-cut nitrification by membrane bioreactor and method thereof - Google Patents
Apparatus for realizing short-cut nitrification by membrane bioreactor and method thereof Download PDFInfo
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Abstract
The invention relates to an apparatus for realizing short-cut nitrification by a membrane bioreactor and method thereof, the apparatus is provided with an anoxic pool, an aerobic pool and an aeration apparatus consisting of an aerator and a blower, a membrane pool and a membrane pool backflow apparatus consisting of a water pump and pipelines, an online dissolved oxygen meter is provided with the aerobic pool, a controllable electric valve and an aeration controller are provided in the aeration apparatus; a backflow controller and a reflux water-locator are provided in the membrane pool backflow apparatus and the membrane pool backflow apparatus is performed a signal connection with an online dissolved oxygen densimeter. The method for realizing the short-cut nitrification comprises: determining a control data through an actual test, setting data; self-operating under an online control. The present invention can be used for wastewater treatment plants and applied to treat nitrogen containing organic industrial wastewater from aquaculture wastewater, monosodium glutamate wastewater, coking wastewater and the like. On the basis of reaching better effect for treating sewage, the apparatus for realizing short-cut nitrification by membrane bioreactor can reduce the aeration energy consumption and add the external carbon sources.
Description
Technical field
The present invention relates to a kind of biochemical process dirty water living creature processing technique, specifically be the apparatus and method that in membrane bioreactor, realize and control short distance nitration, be applicable to municipal sewage plant and other processing such as nitrogenous organic industrial sewages such as breeding wastewater, gourmet powder waste water, coking chemical waste waters.
Background technology
Because the shortage of Freshwater resources and the continuous expansion of body eutrophication have aggravated the shortage of water resources, the emission standard of municipal wastewater treatment plant improves constantly.In order fundamentally to solve water resources problems, reach the sustainable use of water, propose to reach after whole regeneration effluents are handled the battle on water summary of ground Table IV class water quality standard.Being used as reuse water after the advanced treatment of wastewater has been trend of the times.Membrane bioreactor MBR (Membrane Bio-Reactor) is the up-to-date waste water resource regenerative use technology that grows up for 20 end of the centurys, is the combination of membrane separation technique and biotechnology.The second pond and the conventional filtration unit that replace traditional activated sludge process with ultra-filtration membrane or microfiltration membrane isolation technique, hydraulic detention time HRT separates fully with mud SRT in age, compare with traditional dirty water living creature processing technique, the MBR effluent quality is good, capacity of resisting impact load is strong, sludge yield is little, and floor space is little, biomass is big, rich biodiversity, do not have the advantages such as anxiety of sludge bulking and sludge loss.But for controlling diaphragm pollutes, generally provide film to clean tolerance, alleviate film and pollute by the film aeration.Film scouring tolerance is generally very big, and dissolved oxygen is higher, and the membrane cisterna mixed-liquor return that contains high-solubility oxygen can improve the dissolved oxygen of oxygen-starved area to the oxygen-starved area, destroys denitrifying condition, influences denitrification effect and effluent quality.
The traditional biological denitrogenation is by nitrated with NH
4 +-N is converted into NO
3 --N, again by denitrification with NO
3 --N is converted into nitrogen and overflows from water.At nitrated stage, NH
4 +-N is converted to NO
3 --N is by independently two differential responses finishing of bacterium of two classes, at first by nitrococcus Nitrosomonas with NH
4 +-N is converted into NO
2 --N, then by nitrifier Nitrobacter with NO
2 --N is converted into NO
3 --N.Nitrated final product is NO in the traditional biological denitrification process
3 --N, denitrification is with NO
3 --N is an electron acceptor(EA).
For denitrifying bacteria, no matter be that nitrite or nitrate all can be used as final hydrogen acceptor, thereby whole biological denitrification process, also can be through NH
4 +-N → NO
2 --N → N
2" simple and direct " approach is like this finished, i.e. short range biological denitrification technology.Compare with omnidistance denitrogenation, short-cut denitrification has following advantage: save 25% oxygen-supplying amount; Save 40% denitrifying carbon source; Reduce the mud growing amount; Shorten the reaction times, the corresponding minimizing 30%～40% of reactor volume.
Membrane biological reactor process pollutes for controlling diaphragm, the film unit aeration rate is bigger, gas-water ratio is generally greater than 15, the membrane cisterna mixed-liquor return is to the anoxic section of front end, cause the rising of the DO of anoxic section, because denitrification requires to carry out under no DO or low DO, the high DO of anoxic section has influenced the carrying out of anti-nitration reaction.For the aerobic treatment unit, generally do not control DO, bio-denitrification technology is complete nitrification, can not realize the short distance nitration of stability and high efficiency, and not only the aerobic aeration amount is big owing to complete nitrification, requires reactor to have bigger useful volume, and it can biochemical COD/TKN be chemical oxygen demand (COD)/total Kjeldahl nitrogen＞4.0 that denitrification requires, and the general COD/TKN of China's sanitary sewage all is lower than 4.0, especially for containing NH
4 +The trade effluent that-N is high, C/N is lower.So the complete nitrification nitric efficiency is very low.For stable short distance nitration, efficient denitrification just can be realized in COD/TKN＞2.4, so the short distance nitration denitride technology not only can be saved the working cost electricity charge, and can save for improve effluent quality in denitrification process, add outside the expense of carbon source.The shortcoming of membrane bioreactor mainly is the energy consumption height, and the running cost height combines short distance nitration with membrane bioreactor, can cut down the consumption of energy, and realize the rarely seen report of short range biological denitrification in the membrane bioreactor.
The municipal wastewater treatment plant nitrogen content is difficult to major cause up to standard and is the denitrifying carbon source deficiency, and the low ratio of carbon to ammonium of water inlet is low.Short distance nitration denitride technology and traditional complete nitrification reaction comparison can be saved 40% organic carbon source.Thereby, if in the aerobic treatment system of MBR, realize short distance nitration, with NH
4 +-N is oxidized to NO
2 -Behind-the N, by the anoxic section of the system of being back to, DO is lower in the phegma on the one hand, and is less to the influence of anoxic denitrification, can significantly reduce the required carbon source of denitrification on the other hand, thereby realize denitrification efficiently.Under needn't the condition of additional carbon, improve sewage disposal plant effluent water quality, alleviate the advanced treatment expense of recycling sewage generated by making.As seen, realizing and control short range nitrifying method in the MBR reactor is to have theory and realistic meaning, and market application foreground is wide.
Summary of the invention
To the objective of the invention is in order solving the problems of the technologies described above, to have proposed the apparatus and method that a kind of membrane bioreactor is realized short distance nitration.These apparatus and method can reach on the basis of better wastewater treatment efficiency, realize reducing adding of aeration energy consumption and additional carbon.
The objective of the invention is to realize by following technical scheme:
Membrane bioreactor of the present invention is realized the device of short distance nitration, the membrane cisterna reflux that is provided with anoxic pond, Aerobic Pond and the aerating apparatus of forming by aeration head and gas blower, membrane cisterna and forms by water pump and pipeline, it is characterized in that: in Aerobic Pond, be provided with online dissolved oxygen meter, in aerating apparatus, be provided with controlled electrically operated valve between aeration head and the gas blower, and be provided with aeration controller, this aeration controller carries out open and close controlling with described controlled electrically operated valve and is connected, and carries out signal with online dissolved oxygen concentration meter and is connected; Water pump in the membrane cisterna reflux is the flow-controllable water pump, also is provided with backflow controller and phegma water distributor, and the backflow controller carries out flow control with described flow-controllable backflow water pump and is connected, and carries out signal with online dissolved oxygen concentration meter and is connected.
Utilize described membrane bioreactor to realize the device realization short range nitrifying method of short distance nitration: to it is characterized in that may further comprise the steps:
1) according to the practical situation of treatment sewage, test by reality, determine to guarantee the nitrogenous control data up to standard of sewage of this art breading: the upper limit a1 of dissolved oxygen concentration and lower value a2 in the Aerobic Pond, general a1＜4mg/L, a2＞0.2mg/L, determine that the backflow controller extracts dissolved oxygen concentration signal interval T1, selections such as the precision that T1 generally regulates according to the practical situation needs or the reliability of dissolved oxygen meter, sensitivity can be chosen in the 1-20min scope; Determine higher limit c1 and the lower value c2 and the each adjustable value ± c0 of reflux ratio of membrane cisterna reflux ratio according to the flooding quantity of membrane cisterna, general c1＜4, c2＞1, c0 can choose in the 0.01-0.2 scope; Determine the upper limit b1 and the lower value b2 of motorized valve aperture to be generally b1:60%-100%, b2:20%-60% according to the situation of the volume of Aerobic Pond and aerating apparatus; Operating angle ± the N2 of single motorized valve determines according to the precision that the characteristics and the needs of selected magnetic valve are adjusted; Determine that aeration controller extracts dissolved oxygen concentration signal interval T2, be generally 1-20min, DO is lower than the time T 3 of setting lower limit b1; General T3＞10min.
2) connect backflow controller and aeration controller power supply, be provided with the 1st) the step established data; Start membrane cisterna phegma equipment;
3) online dissolved oxygen sensor obtains measured signal, and gives the backflow controller with signal feedback, and in the backflow controller, measured signal and set(ting)value bound once compare every time T 1;
4) when surveying dissolved oxygen concentration within range of set value, promptly between a1, a2 value, then system continues operation, and current reflux state remains unchanged; When the actual measurement dissolved oxygen concentration is lower than lower limit b1, then strengthen reflux ratio; When the actual measurement dissolved oxygen concentration is higher than upper limit a1, then turn down reflux ratio, the each adjustable value of reflux ratio is ± c0, but reflux ratio must be higher than lower limit c2; The variation of reflux ratio causes the variation of quantity of reflux, and the variable frequency pump system makes corresponding adjustment to this; Return the 3rd then) step; When reflux ratio reaches upper limit c1, dissolved oxygen concentration still is lower than lower limit a2, in the time of promptly still need improving reflux ratio, returns the 3rd) step, start the 5th simultaneously) step;
5) online dissolved oxygen sensor obtains measured signal and feeds back to aeration controller, and in aeration controller, the dissolved oxygen bound of actual dissolved oxygen and setting once compares every T2; When dissolved oxygen concentration still was lower than lower limit a2, big N2 angle left by motorized valve, but must be less than motorized valve maximum opening b1; Repeat the 5th) step; When actual dissolved oxygen is higher than lower limit a2, motorized valve turns down the N2 angle, when the motorized valve aperture is lower limit b2, when dissolved oxygen still is higher than dissolved oxygen lower limit a2 at T3 in the time, then closes blower fan; Return the 3rd).
Traditional Aerobic Pond aeration very easily causes dissolved oxygen too high, and one of control condition that realizes short distance nitration is low dissolved axygen, the major advantage of this device is to reduce the Aerobic Pond aeration rate by the membrane cisterna phegma being back to Aerobic Pond, reaching, and keeps the low dissolved axygen level of Aerobic Pond.Because the membrane cisterna mixed solution carries a large amount of dissolved oxygens, is back to the oxygen-starved area and can destroys denitrifying condition, causes denitrification incomplete.And it is back to Aerobic Pond by water distributor, through the cutting action of water distributor, air pocket is cut into small bubbles, for Aerobic Pond provides dissolved oxygen.This technology had both solved the backflow anoxic pond and had caused the high problem of dissolved oxygen, had reduced aeration rate again.Simultaneously, membrane cisterna phegma Controlling System not only can be saved aeration rate, and very easily controls the aeration tank in the low dissolved axygen level.For nitrococcus Nitrosomonas creates favourable growth conditions, constantly eluriate nitrifier Nitrobacter, thereby in membrane bioreactor, realize short distance nitration.
Too low for fear of the Aerobic Pond dissolved oxygen, influence rate of nitrification, at Aerobic Pond aerator is set simultaneously, if membrane cisterna phegma Controlling System can not be kept the lower limit that dissolved oxygen levels is higher than setting, controller starts aerator automatically, with the dissolved oxygen of keeping Aerobic Pond in setting range.
The objective of the invention is without any physico-chemical pretreatment, in the MBR reactor, by improving membrane cisterna mixed-liquor return mode, the control reflux ratio is a quantity of reflux, set up the backflow water distributor, control Aerobic Pond dissolved oxygen is realized the short distance biological nitration of high nitrous acid cumulative percentage, thereby is saved a large amount of denitrifying carbon sources.And can save aeration consumption, on the basis of improving effluent quality, realize energy-saving and cost-reducing.This invention is adjusted reflux ratio according to the variation of dissolved oxygen, by effective dissolved oxygen control, stops the raised growth of NOB and realizes short distance nitration.This invention not only solves the contradiction of existing technology, and have that technical process is simple, the fluctuation that adapts to the water quality and the water yield, flexible operation, characteristics simple to operate.Can significantly reduce and build and working cost.
Dissolved oxygen is one of key parameter of control nitrite accumulation, and dissolved oxygen concentration can not be too high, and too high meeting makes nitrite-oxidizing, is unfavorable for the accumulation of nitrite, but can not be too low, and too low meeting causes the oxygen supply deficiency, is unfavorable for the generation of nitrite.Nitrosomas and Nitromonas all are absolute aerobic bacterias, it is generally acknowledged to make DO could carry out nitrification well at least when 0.5mg/l is above in activated sludge reactor, otherwise nitrification can be suppressed.Reduce dissolved oxygen and can control the growth of nitrous acid oxidation bacterium, realize the accumulation of nitrococcus.The present invention realizes linking by membrane cisterna mixed-liquor return and Aerobic Pond and with the Aerobic Pond dissolved oxygen, in time adjusts reflux ratio according to the Aerobic Pond dissolved oxygen, controls aerobic reaction tank at the low dissolved axygen level run.Thereby realization short distance nitration.When dissolved oxygen is high, at first close or turn down aeration rate, if dissolved oxygen can not be reduced to specialized range after the aeration rate adjustment, then reduce the membrane cisterna reflux ratio, but should be higher than minimum reflux ratio; When the Aerobic Pond dissolved oxygen is low, at first strengthen the membrane cisterna reflux ratio, after adjusting reflux ratio, dissolved oxygen does not rise to specialized range, then strengthens aeration rate.
Description of drawings
Fig. 1 is the structural representation that membrane bioreactor of the present invention is realized the equipment of short distance nitration.
The profile of product of the present invention is not subjected to the restriction of this figure, and only the profile change also belongs to protection scope of the present invention.
Embodiment
The present invention is done the explanation of into going up the step below in conjunction with drawings and Examples: embodiment 1: referring to accompanying drawing, utilize the device of the membrane bioreactor realization short distance nitration of following technology operation, be provided with anoxic pond 1, Aerobic Pond 2 and the aerating apparatus of forming by aeration head 4 and gas blower 42, membrane cisterna 8 and the membrane cisterna reflux of forming by water pump 31 and pipeline, it is characterized in that: in Aerobic Pond, be provided with online dissolved oxygen meter 7, in aerating apparatus, be provided with controlled electrically operated valve 41 between aeration head and the gas blower, and be provided with aeration controller 6, this aeration controller carries out open and close controlling with described controlled electrically operated valve and is connected, and carries out signal with online dissolved oxygen concentration meter and is connected; Water pump in the membrane cisterna reflux is a flow-controllable backflow water pump, also is provided with backflow controller 5 and phegma water distributor 3, and the backflow controller carries out flow control with described flow-controllable backflow water pump and is connected, and carries out signal with online dissolved oxygen concentration meter and is connected;
Membrane bioreactor is realized the technology of the device realization short distance nitration of short distance nitration: it is characterized in that may further comprise the steps:
1) according to the practical situation of treatment sewage, test by reality, determine to guarantee the nitrogenous control data up to standard of sewage of this art breading: the upper limit a1 of dissolved oxygen concentration and lower value a2 in the Aerobic Pond, determine that the backflow controller extracts dissolved oxygen concentration signal interval T1; Determine higher limit c1 and the lower value c2 and the each adjustable value ± c0 of reflux ratio of membrane cisterna reflux ratio according to the flooding quantity of membrane cisterna; Determine the upper limit b1 and the lower value b2 of motorized valve aperture according to the situation of the volume of Aerobic Pond and aerating apparatus; Operating angle ± the N2 of single motorized valve, DO are lower than the time T 3 of setting lower limit b1;
2) connect backflow controller and aeration controller power supply, be provided with the 1st) the step established data; Start membrane cisterna phegma equipment;
3) online dissolved oxygen sensor obtains measured signal, and gives the backflow controller with signal feedback, and in the backflow controller, measured signal and set(ting)value bound once compare every time T 1;
4) when surveying dissolved oxygen concentration within range of set value, promptly between a1, a2 value, then system continues operation, and current reflux state remains unchanged; When the actual measurement dissolved oxygen concentration is lower than lower limit b1, then strengthen reflux ratio; When the actual measurement dissolved oxygen concentration is higher than upper limit a1, then turn down reflux ratio, the each adjustable value of reflux ratio is ± c0, but reflux ratio must be higher than lower limit c2; The variation of reflux ratio causes the variation of quantity of reflux, and the variable frequency pump system makes corresponding adjustment to this; Return the 3rd then) step; When reflux ratio reaches upper limit c1, dissolved oxygen concentration still is lower than lower limit a2, in the time of promptly still need improving reflux ratio, returns the 3rd) step, start the 5th simultaneously) step;
5) online dissolved oxygen sensor obtains measured signal and feeds back to aeration controller, and in aeration controller, the dissolved oxygen bound of actual dissolved oxygen and setting once compares every T2; When dissolved oxygen concentration still was lower than lower limit a2, big N2 angle left by motorized valve, but must be less than motorized valve maximum opening b1; Repeat the 5th) step; When actual dissolved oxygen is higher than lower limit a2, motorized valve turns down the N2 angle, when the motorized valve aperture is lower limit b2, when dissolved oxygen still is higher than dissolved oxygen lower limit a2 at T3 in the time, then closes blower fan; Return the 3rd).
Concrete operations: sewage is taken from the preliminary sedimentation tank water outlet of municipal sewage plant, Gaobeidian City, Beijing, is the water inlet of typical municipal sewage plant.The equal water quality of the former moon in water: COD 317mg/l; NH
4 +-N 53.8mg/l; TP 5.92mg/l; PH 7.52.Per two days sampling analysis once, the analytical procedure that adopts in the test all is standard methods of State Bureau of Environmental Protection issue.
At first, at the reactor inoculation of activated-sludge, postvaccinal sludge concentration MLSS is respectively 4000mg/L.Start reactor.
Connect backflow controller and aeration controller power supply, carry out parameter setting, the upper limit a1 of dissolved oxygen concentration is 2mg/L in the Aerobic Pond, and lower value a2 is 0.5mg/L; It is 5min that the backflow controller extracts dissolved oxygen concentration signal interval T1; The higher limit c1 of membrane cisterna reflux ratio is 3, and lower value c2 is 1.5; Each each adjustable value ± c0 of reflux ratio is 0.1; The upper limit b1 of motorized valve aperture is 90%, and lower value b2 is 50%; Operating angle ± the N2 of single motorized valve is 2%; It is 5min that aeration controller extracts dissolved oxygen concentration signal interval T2, and DO is lower than the time T 3 of setting lower limit b1 and is 10min.Start intake pump and begin water inlet, flooding quantity is 50L/d, and start-up system internal reflux pump is back to the anoxic section with the Aerobic Pond nitrification liquid simultaneously, carries out denitrification, and reflux ratio is 3.Reactor moves 6 months continuously.Test-results shows: the NH of system
4 +The clearance of-N about 80%～95%, water outlet NH
4 +-N is lower than 2mg/L.After operation 5 months, system NO
2 --N cumulative percentage reaches 75%～85%.Water outlet NO
x --N is lower than 6mg/L, and under the situation of no additional carbon, water outlet TN is lower than 8mg/L.Effluent quality satisfies municipal sewage plant's pollutant emission standard: GB18918-2002.Having saved on the basis that outer carbon source adds, realized the raising of effluent quality.The aerobic aeration system utilizes the DO that carries in the membrane cisterna phegma to carry out aeration, has controlled the low DO of Aerobic Pond, has realized short distance nitration, has saved aeration rate simultaneously.The device of present embodiment and technology and traditional technology contrast can be saved 25% oxygen-supplying amount; Save 40% denitrifying carbon source; Shorten the reaction times, the corresponding minimizing 30%～40% of reactor volume.
It below only is 1 embodiment of this patent; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as the protection domain of this patent.
Claims (1)
1. a membrane bioreactor that utilizes the operation of following technology is realized the device of short distance nitration, be provided with anoxic pond (1), Aerobic Pond (2) and the aerating apparatus of forming by aeration head (4) and gas blower (42), membrane cisterna (8) and the membrane cisterna reflux of forming by water pump (31) and pipeline, it is characterized in that: in Aerobic Pond, be provided with online dissolved oxygen meter (7), in aerating apparatus, be provided with controlled electrically operated valve (41) between aeration head and the gas blower, and be provided with aeration controller (6), this aeration controller carries out open and close controlling with described controlled electrically operated valve and is connected, and carries out signal with online dissolved oxygen concentration meter and is connected; Water pump in the membrane cisterna reflux is a flow-controllable backflow water pump, also is provided with backflow controller (5) and phegma water distributor (3), and the backflow controller carries out flow control with described flow-controllable backflow water pump and is connected, and carries out signal with online dissolved oxygen concentration meter and is connected;
Described membrane bioreactor is realized the device realization short range nitrifying method of short distance nitration: it is characterized in that may further comprise the steps:
1) according to the practical situation of treatment sewage, test by reality, determine to guarantee the nitrogenous control data up to standard of sewage of this art breading: the upper limit a1 of dissolved oxygen concentration and lower value a2 in the Aerobic Pond, general a1＜4mg/L, a2＞0.2mg/L, determine that the backflow controller extracts dissolved oxygen concentration signal interval T1, selections such as the precision that T1 generally regulates according to the practical situation needs or the reliability of dissolved oxygen meter, sensitivity can be chosen in the 1-20min scope; Determine higher limit c1 and the lower value c2 and the each adjustable value ± c0 of reflux ratio of membrane cisterna reflux ratio according to the flooding quantity of membrane cisterna, general c1＜4, c2＞1, c0 can choose in the 0.01-0.2 scope; Determine the upper limit b1 and the lower value b2 of motorized valve aperture to be generally b1:60%-100%, b2:20%-60% according to the situation of the volume of Aerobic Pond and aerating apparatus; Operating angle ± the N2 of single motorized valve determines according to the precision that the characteristics and the needs of selected magnetic valve are adjusted; Determine that aeration controller extracts dissolved oxygen concentration signal interval T2, be generally 1-20min, DO is lower than the time T 3 of setting lower limit b1; General T3＞10min;
2) connect backflow controller and aeration controller power supply, be provided with the 1st) the step established data; Start membrane cisterna phegma equipment;
3) online dissolved oxygen sensor obtains measured signal, and gives the backflow controller with signal feedback, and in the backflow controller, measured signal and set(ting)value bound once compare every time T 1;
4) when surveying dissolved oxygen concentration within range of set value, promptly between a1, a2 value, then system continues operation, and current reflux state remains unchanged; When the actual measurement dissolved oxygen concentration is lower than lower limit b1, then strengthen reflux ratio; When the actual measurement dissolved oxygen concentration is higher than upper limit a1, then turn down reflux ratio, the each adjustable value of reflux ratio is ± c0, but reflux ratio must be higher than lower limit c2; The variation of reflux ratio causes the variation of quantity of reflux, and the variable frequency pump system makes corresponding adjustment to this; Return the 3rd then) step; When reflux ratio reaches upper limit c1, dissolved oxygen concentration still is lower than lower limit a2, in the time of promptly still need improving reflux ratio, returns the 3rd) step, start the 5th simultaneously) step;
5) online dissolved oxygen sensor obtains measured signal and feeds back to aeration controller, and in aeration controller, the dissolved oxygen bound of actual dissolved oxygen and setting once compares every T2; When dissolved oxygen concentration still was lower than lower limit a2, big N2 angle left by motorized valve, but must be less than motorized valve maximum opening b1; Repeat the 5th) step; When actual dissolved oxygen is higher than lower limit a2, motorized valve turns down the N2 angle, when the motorized valve aperture is lower limit b2, when dissolved oxygen still is higher than dissolved oxygen lower limit a2 at T3 in the time, then closes blower fan; Return the 3rd).
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| CN113003714A (en) * | 2021-04-14 | 2021-06-22 | 郑州轻工业大学 | Method for realizing rapid accumulation of nitrous oxides based on membrane separation circulating water inflow |
| CN117164178A (en) * | 2023-11-02 | 2023-12-05 | 珙县华洁危险废物治理有限责任公司成都分公司 | Brewing wastewater treatment system and method |
| CN117164178B (en) * | 2023-11-02 | 2024-01-05 | 珙县华洁危险废物治理有限责任公司成都分公司 | Brewing wastewater treatment system and method |
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Application publication date: 20110928 |