CN102583735B - Biological treatment method for wastewater and wastewater treatment device - Google Patents

Biological treatment method for wastewater and wastewater treatment device Download PDF

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Publication number
CN102583735B
CN102583735B CN201210014874.3A CN201210014874A CN102583735B CN 102583735 B CN102583735 B CN 102583735B CN 201210014874 A CN201210014874 A CN 201210014874A CN 102583735 B CN102583735 B CN 102583735B
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gas
water
confinement
wastewater treatment
collection
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CN102583735A (en
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大给理江
小原卓巳
山中理
佐竹正城
山本胜也
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Toshiba Corp
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Toshiba Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Treating Waste Gases (AREA)
  • Biological Treatment Of Waste Water (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)

Abstract

The invention provides a wastewater treatment device, wherein untreated water is subjected to denitrificaion treatment in a denitrificaion groove in an oxygen-free state by denitrificaion bacteria. Then the treated water in the denitrificaion groove is aerated and is subjected to nitrificaition treatment in an aerobic state. Nitrifying liquid in the nitrification groove after the nitrificaition treatment is subjected to solid-liquid separation into treated water and activated sludge. Then N2O gas generated in the denitrificaion groove and in the nitrification groove and during the above process is collected through a gas collection mechanism. The collected gas is subjected to oxidation treatment, so that N20 is converted to NO3.

Description

Biological processes method and the wastewater treatment equipment of waste water
The application is take Japanese patent application 2011-006992 (applying date: on January 17th, 2011) as basis, and advocates the right of priority of this application.The application, with reference to this application, is all included the content of this application.
Technical field
Embodiments of the present invention relate to the biological processes method and the wastewater treatment equipment that by biological reaction apparatus, untreated water are carried out the waste water of biological processes.
Background technology
Carry out, in the treatment process and device of waste water of biological processes, in the denitrifying tank of anaerobic state, reducing after processing by denitrifying bacteria at the nitrogen component in waste water, in the nitrifying groove of aerobic conditions, carry out oxide treatment by nitrobacteria.During known these are processed, as byproduct of reaction, produce N 2o (nitrous oxide) gas.N 2o gas is considered to have the Greenhouse effect of 310 times of carbon dioxide.Global warming becomes international problem, as the N of greenhouse gases 2the minimizing no less important of the minimizing of O gas and carbon dioxide and methane gas.From such background, in the processing of waste water, also carry out in order to suppress N 2the research that O generates.
For example, JP, P2007-75821 discloses wastewater treatment equipment.This wastewater treatment equipment has the biological reaction tank of micro-aerobism at the leading portion of denitrifying tank, by the N that contains producing in nitrifying groove 2the gas of O directly imports in micro-aerobic groove, by N 2o reduction.
JP, P200-246055 discloses other wastewater treatment equipment.This wastewater treatment equipment is by the N that contains producing in nitrifying groove 2the gas of O is transported to oxygen and removes in device, will be blended in containing N in advance 2oxygen in the gas of O is removed, and the depleted gas of having removed oxygen is imported in the waste water of denitrifying tank, by N 2o reduction.
JP, P1998-128389 also discloses other wastewater treatment equipments.This wastewater treatment equipment is by the N that contains producing in nitrifying groove 2the gas of O is transported in accumulator tank, makes containing N 2the gas of O is diffused into by nitrification liquid circulation line and is transported in the nitrification liquid in accumulator tank.Thus, make containing N 2contained N in the gas of O 2o gas dissolving in nitrification liquid, and then, by the N being dissolved in nitrification liquid 2o is transported in denitrifying tank, by N 2o reduction.
Summary of the invention
But, using in the method for micro-aerobic groove, this micro-aerobic groove need to be newly set, in the lower water treatment place in limited space, micro-aerobic groove is newly set very difficult.In addition, in the situation that using oxygen to remove device, remove device as optimal oxygen, recommend molecular sieve gac or gas separation membrane.But these device prices are high, and need to change termly gac or separatory membrane, waste time and energy very much.
Therefore, wish obtain utilizing existing device as far as possible and can effectively suppress N 2the method and system that O emits to atmosphere.
The biological processes method of the waste water of embodiments of the present invention is characterised in that, untreated water is reduced to processing by denitrifying bacteria in the denitrifying tank of anaerobic state; Processed water through denitrifying tank is carried out to oxide treatment by nitrobacteria in the nitrifying groove of aerobic conditions; By the N that contains producing in reduction processing or oxidation processes 2the gas of O is collected with collection and confinement of gases mechanism; By the gas dissolving by collection and confinement of gases collect in liquid; Then, the liquid that is dissolved with gas is carried out to oxide treatment, make N 2o is transformed into NO 3.
The wastewater treatment equipment of embodiments of the present invention is characterised in that to possess: denitrifying tank, and it reduces processing by denitrifying bacteria by untreated water in anaerobic state; Nitrifying groove, it carries out oxide treatment by nitrobacteria by the processed water through denitrifying tank in the aerobic conditions of utilizing aeration; Equipment for separating liquid from solid, it processes water and active sludge by being separated into through the nitrification liquid of oxide treatment; Collection and confinement of gases mechanism, its be collected in that reduction is processed or the process of oxide treatment in produce containing N 2the gas of O; And bio-oxidation handling part, it in liquid, and then carries out oxide treatment to the liquid that is dissolved with gas by the gas dissolving by collection and confinement of gases collect, makes N 2o is transformed into NO 3.
The biological processes method of the waste water of above-mentioned formation and wastewater treatment equipment can utilize existing device as far as possible, effectively suppress N 2o emits to atmosphere.
Accompanying drawing explanation
Fig. 1 is the overall pie graph that represents the 1st embodiment of the wastewater treatment equipment the present invention relates to.
Fig. 2 is illustrated in the local pie graph that is provided with the variation of the 1st embodiment of baffle plate in bio-oxidation handling part.
Fig. 3 is illustrated in the overall pie graph that is provided with the variation of the 1st embodiment of carrier in bio-oxidation handling part.
Fig. 4 is the overall pie graph that nitrifying groove is divided into the 2nd multiple embodiments of the wastewater treatment equipment that the present invention relates to.
Fig. 5 is the overall pie graph that has changed the variation of the 2nd embodiment that returns to place of the gentle body composition of the collection part lysate of gas.
Fig. 6 is can be by the overall pie graph that returns to place and be applicable to the variation of the 2nd embodiment in each place of the absorption portion of gas and gaseous constituent lysate.
Fig. 7 is provided with N 2the overall pie graph of the variation of the 1st embodiment shown in Fig. 1 that O determinator also can be controlled according to measured value.
Fig. 8 be the wastewater treatment equipment that the present invention relates to use the overall pie graph of biological reaction tank as the 3rd embodiment of bio-oxidation handling part.
Fig. 9 is by the overall pie graph that returns to place and change into the variation of the 3rd embodiment of nitrifying groove of the processing water of biological reaction tank.
Figure 10 is by the overall pie graph that returns to place and change into the variation of the 3rd embodiment of untreated tank of the processing water of biological reaction tank.
Figure 11 uses the reactive tank of the structure with carrier as the overall pie graph of the variation of the 3rd embodiment of biological reaction tank.
Embodiment
Below, embodiments of the present invention are described.
(the 1st embodiment)
Fig. 1 is the pie graph of the 1st embodiment of explanation wastewater treatment equipment of the present invention.The wastewater treatment equipment of this embodiment possesses denitrifying tank 11, nitrifying groove 12 and the final tank 13 as equipment for separating liquid from solid.The waste water such as water are directed in denitrifying tank 11 as untreated water, carry out the reduction processing of untreated water in denitrifying tank 11 under anaerobic state by denitrifying bacteria.Import in nitrifying groove 12 through the processed water of denitrifying tank 11.In nitrifying groove 12, processed water is exposed to the air supplied with from gas blower 16 of gas diffusion tube 15 by being arranged on bottom, processed water keeps aerobic conditions.And, in this aerobic conditions, carry out oxide treatment by nitrobacteria.In nitrifying groove 12, oxidized nitrification liquid imports in final tank 13, carries out nitrification liquid to be separated into the solid-liquid separation of processing water and active sludge in final tank 13.In addition, a part for nitrification liquid turns back in denitrifying tank 11 by pump 17.In addition, a part for the active sludge of separation sends back in denitrifying tank 11 by pump 18, maintains the biomass in denitrifying tank 11.Residual active sludge is discharged to outside device via vent pipe as excess sludge.
With respect to denitrifying tank 11 and nitrifying groove 12, be provided with collection and confinement of gases mechanism 21 and bio-oxidation handling part 22.Collection and confinement of gases mechanism 21 is by the N that contains from denitrifying tank 11 and nitrifying groove 12 2the collection and confinement of gases of O.Bio-oxidation handling part 22 carries out bio-oxidation processing to the gas of collecting by this collection and confinement of gases mechanism 21, makes N 2o is transformed into NO 3.
In this embodiment, bio-oxidation handling part 22 is made up of sprinkler system 23 and the nitrifying groove 12 that gaseous constituent is dissolved in water of sprinkling water of the gas to collecting by collection and confinement of gases mechanism 21.And, by the water that is dissolved with gaseous constituent is turned back in nitrifying groove 12 and carries out oxide treatment, make N 2o is transformed into NO 3.
In the above-described configuration, untreated water flow in the denitrifying tank 11 of anaerobic state, and organism is decomposed, and then, the processing water of denitrifying tank 11 is transported in the nitrifying groove 12 of aerobic conditions.In nitrifying groove 12, a part for processed nitrification liquid turns back in denitrifying tank 11 via circulation path, and remainder is transported in final tank 13.In nitrifying groove 12, the air of supplying with from gas blower 16 spreads by gas diffusion tube 15, under aerobism condition, by the nitrobacteria of the aerobism microorganism as in active sludge, ammonium-nitrogen in waste water is oxidized, is transformed into nitrite nitrogen and nitrate ammonia.In addition, in denitrifying tank 11, the organism in untreated complete waste water is broken down into water and carbonic acid gas.
Be recycled to by having the circulation path of pump 17 in the denitrifying tank 11 of leading portion from the nitrification liquid of this nitrifying groove 12, therefore, in denitrifying tank 11, nitrite nitrogen and nitrate ammonia are reduced by denitrifying bacteria, generate nitrogen.
In such wastewater treatment, the oxide treatment of nitrifying groove 12 generates N as byproduct of reaction 2o (nitrous oxide), and the reduction of denitrifying tank 11 is processed as intermediate product and is generated N 2o (nitrous oxide).N 2o gas not generates often, but produces there is incomplete denitrogenation in denitrifying tank 11 time.In addition, in nitrifying groove 12, there is the incomplete N that produces when nitrated 2o.Not exclusively denitrogenation is because the sneaking into of dissolved oxygen, nitric acid load is too high, denitrifying bacteria utilizes organism deficiency etc. are former thereby occur.The high hypoxgia causing of incomplete nitrated reason ammonia load/organic loading etc. former thereby occur.Also exist because of other reasons generation N 2the possibility of O, still, thinks in most cases, and above-mentioned 2 reasons are major causes.
The N generating 2o gas accumulates in the headspace of nitrifying groove 12 and denitrifying tank 11 together with air or other generation gas.If this N 2o gas is directly released in atmosphere, described above, and global warming occurs.Therefore, collection and confinement of gases mechanism 21 is by N 2o collection and confinement of gases.Collect from denitrifying tank 11 and nitrifying groove 12 by collection and confinement of gases mechanism 21 containing N 2the gas of O is transported in bio-oxidation handling part 22.
Bio-oxidation handling part 22 is by containing N 2sprinkler system 23 and nitrifying groove 12 on the circulation path of the gas of O form.Sprinkler system 23 sprays the nitrification liquid that pump 24 is supplied with that passes through of discharging from nitrifying groove 12.Therefore, collection containing N 2the gaseous constituent of the gas of O is dissolved in the nitrification liquid of sprinkling, has dissolved N 2the nitrification liquid of O gas sends back in nitrifying groove 12.Then, in nitrifying groove 12, carry out bio-oxidation processing, N 2o becomes NO 3.
Thus, denitrifying tank 11 and nitrifying groove 12 interior generations containing N 2the gas dissolving of O is in the nitrification liquid spraying by the sprinkler system 23 that forms bio-oxidation handling part 22.Then, N 2o is again oxidized by nitrobacteria in nitrifying groove 12.Therefore, the N in gas 2the amount of O significantly reduces., can be by the N in gas 2o processes in the treatment system of nitrated/denitrogenation.Thus, do not need for by the N producing from wastewater treatment equipment 2the special device of O gas harmless, by only appending collection and confinement of gases mechanism 21 and form the simple formation of the sprinkler system 23 of bio-oxidation handling part 22 in existing device, just can effectively reduce the N discharging into the atmosphere 2the amount of O gas.
In addition, the region contacting at the nitrification liquid spraying from the sprinkler system 23 of bio-oxidation handling part 22, with the gas of collecting by collection and confinement of gases mechanism 21, in order to increase their gas-to-liquid contact area, for example, baffle plate 25 as shown in Figure 2 can be set.By baffle plate 25, the contact area of gas-liquid is increased, containing N 2the gas of O increases to the dissolved efficiency of nitrification liquid.In addition, gas also can be collected by fan by collection and confinement of gases mechanism 21.And the liquid of sprinkling is not limited to nitrification liquid, can be also in final tank 13, from nitrification liquid, to separate the processing water or the common tap water that obtain.
(variation of the 1st embodiment)
Fig. 3 represents the variation of the 1st embodiment.Bio-oxidation handling part 22 turns back to and in the path nitrifying groove 12, has the aerobism of adhering to microorganism carrier 26 at the liquid spraying from sprinkler system 23., as shown in the figure, be configured for and adhere to aerobism microorganism carrier 26 in the bottom of sprinkler system 23.The material of carrier 26 can be any material, preferably use aerobism microorganism effectively to adhere to and the material with air permeability as carrier 26.For example use and become the aggregate of plastics small pieces of uneven surface as carrier 26 surface working.
Form if so, by making to have dissolved containing N 2the nitrification liquid of the gas of O contacts with carrier 26, and the aerobism microorganism being attached on carrier can be to N 2o processes, N 2the decomposition of O is removed rate and is improved.In addition, carrier 26 is as long as the liquid that contact is sprayed is not limited to illustrated formation.
(the 2nd embodiment)
Fig. 4 and Fig. 5 represent the 2nd embodiment of the present invention.In addition, give identical Reference numeral for the parts identical with the 1st embodiment, and omit relative detailed description.In this embodiment, nitrifying groove 12 is divided into the multiple regions that comprise the 12A of leading portion portion and the 12B of back segment portion in processing direction.Being divided into the mode that can circulate according to processed water in multiple regions forms.In the example of figure, nitrifying groove 12 is divided into 2 in processing direction, has the 12A of leading portion portion and the 12B of back segment portion.The mode that the above-mentioned leading portion 12A of portion and the 12B of back segment portion can circulate according to processed water forms.In addition, gas diffusion tube 15 commonly arranges with respect to the 12A of leading portion portion and the 12B of back segment portion.
In Fig. 4, gas is collected from the 12A of leading portion portion of nitrifying groove 12 by collection and confinement of gases mechanism 21.Bio-oxidation handling part 22 sprays the nitrification liquid from nitrifying groove 12 for the gas of collecting by sprinkler system 23, and gaseous constituent is dissolved in nitrification liquid, and then, the nitrification liquid that has made to dissolve gaseous constituent turns back to the 12B of back segment portion of nitrifying groove 12.
In Fig. 5, gas is collected from the 12B of back segment portion of nitrifying groove 12 by collection and confinement of gases mechanism 21.Bio-oxidation handling part 22 sprays the nitrification liquid from nitrifying groove 12 for the gas of collecting by sprinkler system 23, and gaseous constituent is dissolved in nitrification liquid, and then, the nitrification liquid that has made to dissolve gaseous constituent turns back to the 12A of leading portion portion of nitrifying groove 12.
Here, the 12A of leading portion portion compared with the 12B of back segment portion containing N 2in the generation of the gas of O situation how, as shown in Figure 4, collect gas at the 12A of leading portion portion of nitrifying groove 12, the nitrification liquid that has made to dissolve gas turns back to the 12B of back segment portion.,, the in the situation that of having there is incomplete reaction in denitrifying tank 11, generate as mentioned above N 2o.This N 2a part of O is dissolved in processed water, flow into the 12A of leading portion portion of nitrifying groove 12.Then,, in the 12A of this leading portion portion, be dissolved in the N in water 2o is discharged in gas by the bubbling being caused by gas diffusion tube 15, becomes containing N 2the gas of O.Therefore, near the 12A of leading portion portion of denitrifying tank 11 containing N 2the generation of the gas of O recently from the 12B of back segment portion containing N 2the generation of the gas of O is many.Under these circumstances, the wastewater treatment equipment of Fig. 4 can be effectively to the N generating in denitrification reaction process 2o processes, and can effectively suppress N 2the burst size of O.
With respect to this, the 12B of back segment portion compared with the 12A of leading portion portion containing N 2in the generation of the gas of O situation how, as shown in Figure 5, collect gas at the 12B of back segment portion of nitrifying groove 12, the water that has dissolved gas is turned back in the 12A of leading portion portion.That is, organic oxidation occurs in nitrifying groove 12, enter into back segment, nitration reaction is stronger.Known the carrying out that is accompanied by this nitration reaction, produces containing N 2the gas (for example, with reference to JP, P1998-128389) of O.Therefore, the wastewater treatment equipment of Fig. 5 is by the N producing at the 12B of back segment portion 2o collection and confinement of gases, makes N 2o turns back to the 12A of leading portion portion, by N 2o oxidation.According to this wastewater treatment equipment, can be effectively by the N producing in nitrifying process 2o oxidation.
Adopt which in the above-mentioned formation of Fig. 4 and the formation of Fig. 5, can determine according to each characteristic as wastewater treatment equipment.Any makes N in forming 2o is dissolved in liquid, makes to have dissolved N 2the liquid of O flows in nitrifying groove 12, can be by the N dissolving again 2o is oxidized and generation nitric acid.
In addition, will make N 2it is the full water structure with U-shaped portion as shown in the figure that O is dissolved in the pipeline that the nitrification liquid in liquid flow in nitrifying groove 12, has prevented the adverse current from the gas of inflow side.
In addition, the 12A of leading portion portion in the 12B of back segment portion and Fig. 5 in Fig. 4 of nitrifying groove 12 is described with air-tight state in figure separately, still, in fact, is formed with and makes the air spraying from gas diffusion tube 15 be discharged into outside release portion.The bio-oxidation handling part 22 of the wastewater treatment equipment of Fig. 4 or Fig. 5 by sprinkler system 23, the 12B of back segment portion or the 12A of leading portion portion of the nitrifying groove 12 that flows into from this pipeline of the pipeline that comprises the full water structure with U-shaped portion and the nitrification liquid that made to dissolve gaseous constituent form.
(variation of the 2nd embodiment)
Fig. 6 represents the variation of above-mentioned the 2nd embodiment.Nitrifying groove 12 is divided into the multiple regions that comprise the 12A of leading portion portion and the 12B of back segment portion in processing direction.Nitrifying groove 12 has the 12A of leading portion portion and the 12B of back segment portion.The 12A of leading portion portion and the 12B of back segment portion form by the mode of the processed water that can circulate.
In the 12A of leading portion portion and the 12B of back segment portion, be respectively equipped with the 21A of collection and confinement of gases mechanism, 21B.The 21A of collection and confinement of gases mechanism links with the 12A of leading portion portion via open and close valve 31A.The 21B of collection and confinement of gases mechanism links with the 12B of back segment portion via open and close valve 31B.By the 21A of collection and confinement of gases mechanism, 21B, can collect gas from any one of the 12A of leading portion portion and the 12B of back segment portion.
Bio-oxidation handling part 22 has the sprinkler system 23 that sprays nitrification liquid to the gas of any one collection by the 21A of collection and confinement of gases mechanism, 21B.The downstream side of this sprinkler system 23, after full water portion, links with the 12B of back segment portion via open and close valve 32A, and links with the 12A of leading portion portion via open and close valve 32B.The nitrification liquid that, has dissolved gaseous constituent can turn back in any one in the 12B of back segment portion and leading portion portion 12.In addition be communicated with outside deodorizing device etc. via corresponding with the 12A of leading portion portion and the 12B of back segment portion respectively vent valve 33A, 33B through the opposition side of the sprinkler system 23 of this bio-oxidation handling part 22.The 12A of leading portion portion and the 12B of back segment portion of the nitrifying groove 12 that bio-oxidation handling part 22 is flowed into from this pipeline by sprinkler system 23, the pipeline with full water portion and open and close valve 32A, 32B, the nitrification liquid that made to dissolve gaseous constituent form.
And then wastewater treatment equipment has contained N the gas to producing from the 12A of leading portion portion and the 12B of back segment portion of nitrifying groove 12 2the determinator 35 that O concentration is measured.Contained N in the gas from the 12A of leading portion portion 2contained N in the gas of O concentration ratio from the 12B of back segment portion 2in the high situation of O concentration, determinator 35, by not shown controller, is opened open and close valve 31A, closes open and close valve 31B, collects the gas from the 12A of leading portion portion.In addition, open the open and close valve 32A of bio-oxidation handling part 22, close open and close valve 32B, the nitrification liquid that has made to dissolve gaseous constituent turns back to the 12B of this back segment portion.And then, open vent valve 33A, close vent valve 33B, the gaseous constituent not being dissolved into the nitrification liquid spraying from sprinkler system 23 is discharged to odor removal.
With respect to this, contained N in the gas from the 12B of back segment portion 2contained N in the gas of O concentration ratio from the 12A of leading portion portion 2in the high situation of O concentration, determinator 35, by not shown controller, is opened open and close valve 31B, closes open and close valve 31A, collects the gas from the 12B of back segment portion.In addition, open the open and close valve 32B of bio-oxidation handling part 22, close open and close valve 32A, the nitrification liquid that has made to dissolve gaseous constituent turns back in the 12A of leading portion portion.Open vent valve 33B, close vent valve 33A, the gaseous constituent not being dissolved into the nitrification liquid spraying from sprinkler system 23 is discharged to odor removal.
, this wastewater treatment equipment is measured the N the gas of collecting from the nitrifying groove 12A of leading portion 2n O concentration and the gas collected from the nitrifying groove 12B of back segment 2o concentration, to collecting and be dissolved into nitrification liquid from the gas of the high nitrifying groove 12A of measured value or nitrifying groove 12B generation.In addition the nitrification liquid that, wastewater treatment equipment has made to dissolve gas flows to nitrifying groove 12B or the 12A that measured value is low.Thus, wastewater treatment equipment can effectively be processed the N producing in denitrification reaction process and nitration reaction process 2o, can suppress N effectively 2the release of O.
In addition, wastewater treatment equipment can be also the N measuring the gas of collecting from the nitrifying groove 12A of leading portion 2n O concentration and the gas collected from the nitrifying groove 12B of back segment 2o concentration, by the collection of gas with dissolved gas nitrification liquid send any one the formation in leading portion 12A and the back segment 12B that is defined as respectively nitrifying groove back to, be not limited to illustrated formation.
In the above-described embodiment, be the situation of 2 exemplified with the number of partitions of nitrifying groove 12, still, number of partitions can be more than 3.In this case, leading portion portion, as long as the division position of the side near denitrifying tank 11, can be any part, and leading portion portion not refers to the division position adjacent with denitrifying tank 11.In addition, back segment portion is as long as the back segment portion with respect to leading portion portion, can be position arbitrarily, and back segment portion may not refer to the discharge section of nitrifying groove 12.
In addition, in the 2nd embodiment and variation thereof, also can be arranged in the 1st embodiment as variation explanation for increasing baffle plate 25 and the aerobism microorganism carrier 26 of gas-liquid area.In addition, the liquid spraying from sprinkler system 23 is not limited to nitrification liquid, can be processing water or tap water from final tank 13.
(variation of the 1st embodiment)
The variation of the embodiment shown in Fig. 7 presentation graphs 1.Wastewater treatment equipment has the N of the gas that mensurated gas composition collecting mechanism 21 collects 2the determinator 37 of O concentration and controller 38.The N measuring by determinator 37 2o concentration is imported in controller 38, with predefined value, i.e. N 2o concentration target value compares.At N 2o concentration determination value exceedes in the situation of predefined value, and controller 38 is implemented the mode control pump 24 of watering according to sprinkler system 23., measure the N collecting in gas 2o concentration, only in measured value than the target value of setting when high, the pump 24 of the use that makes to sprinkle water is worked, nitrification liquid is by N 2o gas dissolves again.Thus, can reduce the running cost of the pump 24 of watering use.
In addition, controller 38 also can be according to N 2the deviation computing watering amount of the measured value of O and target value, the pump 24 of control watering use, adjusts watering amount.And then, also can be according to the N measuring 2o concentration, controls gas blower 16, adjusts the aeration rate for nitrifying groove 12.
The wastewater treatment equipment of this variation is according to collecting contained N in gas 2the measured value of O is controlled, and therefore can prevent useless running, effectively uses.
(the 3rd embodiment)
Fig. 8 represents the 3rd embodiment.In addition, give identical Reference numeral for the parts same with above-mentioned each embodiment, omit the detailed description about it.
About denitrifying tank 11, nitrifying groove 12, as the final tank 13 of equipment for separating liquid from solid, circulation path from from nitrifying groove 12 to denitrifying tank 11, identical with the parts of above-mentioned each embodiment, give identical Reference numeral for the device identical with them and parts.
This embodiment uses the biological reaction tank 22A of the biological processing of carrying out processed water as bio-oxidation handling part 22.Be provided with gas diffusion tube 45 in the bottom of biological reaction tank 22A.The air of blowing from gas blower 46 is emitted from gas diffusion tube 45, and the processed water in biological reaction tank 22A is exposed in air.
The gas producing from denitrifying tank 11 and nitrifying groove 12 is collected by collection and confinement of gases mechanism 21, is blown in the processed water in biological reaction tank 22A by fan 48.In addition, as the processed water in biological reaction tank 22A, can adopt the processed water in the processed water in the processed water of preparation in addition or denitrifying tank 11 as shown in Figure 8 or nitrifying groove 12 as shown in Figure 9 in batch-type ground.
The N being generated by the denitrification reaction in the nitration reaction in nitrifying groove 12 and denitrifying tank 11 2o gas and foul smell are imported directly in biological reaction tank 22A via the gas path of collection and confinement of gases mechanism 21.In addition turn back in denitrifying tank 11 or nitrifying groove 12 to the processing water batch-type being produced by biological respinse in biological reaction tank 22A.
According to above-mentioned formation, N in biological reaction tank 22A 2o is oxidized, and the also oxidized and deodorizing of the foul smell such as hydrogen sulfide and ammonia gas.Thus, wastewater treatment equipment can carry out N simultaneously 2the deodorizing processing of the processing of O and foul smell.The organic loading of biological reaction tank 22A and nitrogen load are compared low with nitrifying groove 12, be therefore difficult to occur incomplete oxidation, can expect N more completely 2the oxide treatment of O.In addition, the place of sending back to of processing water can be untreated tank (not shown) as shown in figure 10.
(variation of the 3rd embodiment)
Figure 11 represents the variation of the 3rd above-mentioned embodiment.What have the short transverse pars intermedia that is configured in groove as the biological reaction tank 22B of bio-oxidation handling part 22 has adhered to aerobe microorganism carrier 51 and configuration sprinkler system 52 at an upper portion thereof.Sprinkler system 52 sprays the processing water separating from nitrification liquid by final tank 13.The gas producing from denitrifying tank 11 and nitrifying groove 12 is collected by collection and confinement of gases mechanism 21, is supplied to the lower side space of carrier 51 by fan 48, from bottom to up by the configuration section of this carrier 51.
Carrier 51 is to have adhered to take nitrobacteria as main aerobism microorganism carrier.Collect containing N 2the gas of O passes through from the inside of reactive tank 22B from bottom to up, thereby can be by being attached to aerobism microorganism on carrier 51 by N 2o is oxidized effectively.In this case, the gas of collecting by collection and confinement of gases mechanism 21 is blown into the lower side space of carrier 51, therefore, compared with situation about being blown in liquid, can reduce the charge capacity of fan 48, and operating cost reduces.
In addition, the mode sending back in denitrifying tank 11 according to the processing water producing in biological reaction tank 22B forms.In addition, the place of sending back to of processing water can be also nitrifying groove 12 or untreated tank.
In the respective embodiments described above, the nitrification liquid that has carried out oxide treatment by nitrobacteria in nitrifying groove 12 is separated into and is processed water and active sludge by final tank 13.But each embodiment also can not use final tank 13 and use the film separated activated sludge method of carrying out solid-liquid separation.
In this film separated activated sludge method, the downstream part in nitrifying groove 12 arranges membrane filter appts, and this membrane filter appts is interior by solid and liquid separation at nitrifying groove 12, and the treatment solution separating is taken out.In this case, similarly a part for nitrification liquid is sent back to denitrifying tank 11 from nitrifying groove 12 with above-mentioned each embodiment.In addition, in nitrifying groove 12, accumulated by membrane filter appts and separated the active sludge obtaining, therefore, this active sludge of accumulating has been extracted out.The active sludge of extracting out is same with above-mentioned each embodiment, and its part is sent back in denitrifying tank 11, and remainder is discharged to outside device as excess sludge.
Like this, in the embodiments of the present invention and variation thereof, untreated water reduces processing by denitrifying bacteria in the denitrifying tank of anaerobic state, by aeration, in the nitrifying groove of aerobic conditions, carries out oxide treatment by nitrobacteria through the processed water of this denitrifying tank.Generate by these biological processes containing N 2the gas of O is by collection and confinement of gases collect, to being carried out oxide treatment by the gas of collection and confinement of gases collect.By this oxide treatment, N 2o is transformed into NO 3.Therefore, in the embodiments of the present invention and variation thereof, by utilizing existing device can effectively suppress N 2o emits to atmosphere.
Although several embodiments of the present invention are illustrated,, these embodiments are to propose as an example, are not intended to limit scope of the present invention.These new embodiments can be implemented by other variety of ways, not departing from the scope of invention main idea, can carry out various omissions, replacement, change.These embodiments and distortion thereof are also contained in scope of the present invention and main idea, and are included in the invention and equal scope thereof of claims record.

Claims (20)

1. a biological processes method for waste water, is characterized in that,
Untreated water is reduced to processing by denitrifying bacteria in the denitrifying tank of anaerobic state,
Processed water through described denitrifying tank is carried out to oxide treatment by nitrobacteria in the nitrifying groove of aerobic conditions,
By the N that contains producing in described reduction processing or described oxidation processes 2the gas of O is collected with collection and confinement of gases mechanism,
By the gas dissolving by described collection and confinement of gases collect in liquid, then,
The liquid that is dissolved with gas is carried out to oxide treatment, make N 2o is transformed into NO 3.
2. a wastewater treatment equipment, is characterized in that, possesses:
Denitrifying tank, it reduces processing by denitrifying bacteria by untreated water in anaerobic state;
Nitrifying groove, it carries out oxide treatment by nitrobacteria by the processed water through described denitrifying tank in the aerobic conditions of utilizing aeration;
Equipment for separating liquid from solid, it processes water and active sludge by being separated into through the nitrification liquid of oxide treatment;
Collection and confinement of gases mechanism, its be collected in that described reduction is processed or the process of described oxide treatment in produce containing N 2the gas of O; And
Bio-oxidation handling part, it in liquid, and then carries out oxide treatment to the liquid that is dissolved with described gas by the gas dissolving by described collection and confinement of gases collect, makes N 2o is transformed into NO 3.
3. wastewater treatment equipment according to claim 2, is characterized in that,
Described bio-oxidation handling part makes gaseous constituent be dissolved into the sprinkler system in water by the gas watering to by described collection and confinement of gases collect and described nitrifying groove that the water that is dissolved with this gaseous constituent is returned forms, and in described nitrifying groove, the water that is dissolved with described gaseous constituent is carried out to oxide treatment.
4. wastewater treatment equipment according to claim 3, is characterized in that,
Described nitrifying groove is divided into the multiple regions that comprise leading portion portion and back segment portion in processing direction, and described multiple regions form according to the mode of the processed water that can circulate,
Described collection and confinement of gases mechanism from the described leading portion portion of described nitrifying groove by collection and confinement of gases, described bio-oxidation handling part turns back to the water that is dissolved with gaseous constituent the described back segment portion of described nitrifying groove, in described nitrifying groove, the water that is dissolved with described gaseous constituent is carried out to oxide treatment.
5. wastewater treatment equipment according to claim 3, is characterized in that,
Described nitrifying groove is divided into the multiple regions that comprise leading portion portion and back segment portion in processing direction, and multiple regions form by the mode of the processed water that can circulate,
Described collection and confinement of gases mechanism is from the described back segment portion of nitrifying groove by collection and confinement of gases, and described bio-oxidation handling part turns back to the water that is dissolved with gaseous constituent in the described leading portion portion of nitrifying groove, will be dissolved with the water oxidation of described gaseous constituent in nitrifying groove.
6. wastewater treatment equipment according to claim 3, is characterized in that,
Described nitrifying groove is divided into the multiple regions that comprise leading portion portion and back segment portion in processing direction, and described multiple regions form by the mode of the processed water that can circulate,
Described collection and confinement of gases mechanism has the open and close valve linking respectively with described leading portion portion and described back segment portion, can collect described gas from any one of described leading portion portion and described back segment portion,
Described bio-oxidation handling part has the open and close valve linking respectively with described back segment portion and leading portion portion, can make the water that is dissolved with described gaseous constituent turn back in any one of described back segment portion and leading portion portion.
7. wastewater treatment equipment according to claim 6, is characterized in that,
This wastewater treatment equipment further has the N that measures the gas producing from described leading portion portion 2the N of O concentration and the gas that produces from described back segment portion 2the determinator of O concentration,
At the N of the gas from described leading portion portion 2o concentration ratio is from the high situation of the gas of described back segment portion, the described open and close valve of the described collection and confinement of gases mechanism of leading to described leading portion portion is opened, described collection and confinement of gases collect is from the gas of described leading portion portion, and the open and close valve of the described bio-oxidation handling part that leads to described back segment portion is opened, the water that makes to be dissolved with described gaseous constituent turns back to described back segment portion
At the N of the gas of the described back segment portion from described nitrifying groove 2o concentration ratio is from the high situation of the gas of described leading portion portion, the described open and close valve of the described collection and confinement of gases mechanism of leading to described back segment portion is opened, described collection and confinement of gases collect is from the gas of described back segment portion, and the open and close valve of the described bio-oxidation handling part that leads to described leading portion portion is opened, and the water that is dissolved with described gaseous constituent is turned back to leading portion portion by described bio-oxidation handling part.
8. wastewater treatment equipment according to claim 3, is characterized in that, the baffle plate that described bio-oxidation handling part has the water for making to spray and passes through the gas-to-liquid contact area change of the gas of described collection and confinement of gases collect.
9. wastewater treatment equipment according to claim 3, is characterized in that, described bio-oxidation handling part has the aerobism of adhering to microorganism carrier in the water that makes to be dissolved with described gaseous constituent turns back to the path in nitrifying groove.
10. wastewater treatment equipment according to claim 3, is characterized in that, the water that described sprinkler system sprays is the nitrification liquid taking out from described nitrifying groove.
11. wastewater treatment equipments according to claim 3, is characterized in that, the water that described sprinkler system sprays is to separate from described nitrification liquid the processing water obtaining.
12. wastewater treatment equipments according to claim 3, is characterized in that, this wastewater treatment equipment further has: determinator, it measures the N of the gas of described collection and confinement of gases collect 2o concentration; And control part, the N that it is being measured 2o concentration exceedes in the situation of predefined value makes described sprinkler system implement watering.
13. wastewater treatment equipments according to claim 3, is characterized in that, this wastewater treatment equipment further has: determinator, it measures the N of the gas of described collection and confinement of gases collect 2o concentration; And control part, it is according to the N measuring 2o concentration is adjusted the watering amount of described sprinkler system.
14. wastewater treatment equipments according to claim 3, is characterized in that, this wastewater treatment equipment further has: determinator, it measures the N of the gas of described collection and confinement of gases collect 2o concentration; And control part, it is according to the N measuring 2o concentration is adjusted the aeration rate for nitrifying groove.
15. wastewater treatment equipments according to claim 2, it is characterized in that, described bio-oxidation handling part has the biological reaction tank that processed water aeration is carried out a biological disposal upon, and is blown in the processed water in described biological reaction tank by the gas of described collection and confinement of gases collect.
16. wastewater treatment equipments according to claim 15, is characterized in that, the processed water of the described biological reaction tank using as described bio-oxidation handling part uses the liquid in described denitrifying tank.
17. wastewater treatment equipments according to claim 15, is characterized in that, the processed water of the described biological reaction tank using as described bio-oxidation handling part uses the liquid in described nitrifying groove.
18. wastewater treatment equipments according to claim 2, it is characterized in that, described bio-oxidation handling part has: possess and adhered to aerobism microorganism carrier by what separate the biological reaction tank of the sprinkler system that the processing water that obtains sprays from top and the short transverse pars intermedia configuration in described biological reaction tank from described nitrification liquid, be supplied to the lower side space of the described carrier in described biological reaction tank by the gas of described collection and confinement of gases collect, be supplied to the gas of lower side space of described carrier from bottom to top by described bearer configuration part.
19. wastewater treatment equipments according to claim 9, is characterized in that, the described gas of described collection and confinement of gases collect passes through from described carrier.
20. wastewater treatment equipments according to claim 3, is characterized in that, possess the full water structure with U-shaped portion in the path that the water that is dissolved with described gaseous constituent is turned back to described nitrifying groove.
CN201210014874.3A 2011-01-17 2012-01-17 Biological treatment method for wastewater and wastewater treatment device Expired - Fee Related CN102583735B (en)

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