CN102583735A - 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
CN102583735A
CN102583735A CN2012100148743A CN201210014874A CN102583735A CN 102583735 A CN102583735 A CN 102583735A CN 2012100148743 A CN2012100148743 A CN 2012100148743A CN 201210014874 A CN201210014874 A CN 201210014874A CN 102583735 A CN102583735 A CN 102583735A
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gas
water
confinement
collection
wastewater treatment
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CN2012100148743A
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CN102583735B (en
Inventor
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)
  • Biological Treatment Of Waste Water (AREA)
  • Treating Waste Gases (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

The biological processes method and the wastewater treatment equipment of waste water
The application is with the Japanese patent application 2011-006992 (applying date: on January 17th, 2011) be the basis, and advocate the right of priority of this application.The application is with reference to this application, in the content of this application all is included in.
Technical field
Embodiment of the present invention relates to biological processes method and the wastewater treatment equipment that untreated water is carried out the waste water of biological processes through biological reaction apparatus.
Background technology
In wastewater treatment method of the nitrogen component in the waste water being carried out biological processes and device, in the denitrifying tank of anaerobic state through denitrifying bacteria reduce handle after, in the nitrifying groove of aerobic conditions, carry out oxide treatment through nitrobacteria.During known these are handled,, produce N as byproduct of reaction 2O (nitrous oxide) gas.N 2O gas is considered to have 310 times Greenhouse effect of dioxide gas.Global warming becomes international problem, as the N of greenhouse gases 2The minimizing no less important of the minimizing of O gas and dioxide gas and methane gas.From such background, in the processing of waste water, also carried out in order to suppress N 2The research that O generates.
For example, JP, P2007-75821 discloses wastewater treatment equipment.The biological reaction tank that this wastewater treatment equipment has little aerobism at the leading portion of denitrifying tank, what will in nitrifying groove, produce contains N 2The gas of O directly imports in little aerobic groove, with N 2The O reduction.
JP, P200-246055 disclose other wastewater treatment equipment.This wastewater treatment equipment will produce in nitrifying groove contains N 2The gas delivery of O is removed in the device to oxygen, will be blended in advance to contain N 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, with N 2The O reduction.
JP, P1998-128389 also disclose other wastewater treatment equipments.This wastewater treatment equipment will produce in nitrifying groove contains N 2The gas delivery of O makes to contain N in accumulator tank 2The gaseous diffusion of O is to being transported in the nitrification liquid in the accumulator tank through the nitrification liquid circulation line.Thus, make and contain N 2Contained N in the gas of O 2The O gas dissolving in nitrification liquid, and then, with the N that is dissolved in the nitrification liquid 2O is transported in the denitrifying tank, with N 2The O reduction.
Summary of the invention
But, in the method for using little aerobic groove, need new this little aerobic groove that is provided with, very difficulty of little aerobic groove newly is set in the water treatment place under limited spatial.In addition,, remove device, recommend molecular sieve gac or gas separation membrane as optimal oxygen using oxygen to remove under the situation of device.But these device prices are high, and need change gac or separatory membrane termly, waste time and energy very much.
Therefore, hope to obtain to utilize existing device as far as possible and can suppress N effectively 2The method and system that O emits to atmosphere.
The biological processes method of the waste water of embodiment of the present invention is characterised in that, untreated water is reduced processing through denitrifying bacteria in the denitrifying tank of anaerobic state; The processed water that will pass through denitrifying tank carries out oxide treatment through nitrobacteria in the nitrifying groove of aerobic conditions; Will reduction handle or oxidation processes in produce contain N 2The gas of O is collected with collection and confinement of gases mechanism; The gas dissolving that to collect through collection and confinement of gases mechanism is in liquid; Then, the liquid that is dissolved with gas is carried out oxide treatment, make N 2O is transformed into NO 3
The wastewater treatment equipment of embodiment of the present invention is characterised in that to possess: denitrifying tank, and it reduces processing through denitrifying bacteria with untreated water in anaerobic state; Nitrifying groove, its processed water that will pass through denitrifying tank carries out oxide treatment through nitrobacteria in utilizing the aerobic conditions of aeration; Equipment for separating liquid from solid, it will separate into treating water and active sludge through the nitrification liquid of oxide treatment; Collection and confinement of gases mechanism, its be collected in that reduction is handled or the process of oxide treatment in produce contain N 2The gas of O; And the bio-oxidation handling part, its gas dissolving that will collect through collection and confinement of gases mechanism and then is carried out oxide treatment to the liquid that is dissolved with gas in liquid, make 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, suppress N effectively 2O emits to atmosphere.
Description of drawings
Fig. 1 is the whole pie graph of the 1st embodiment of the wastewater treatment equipment that the present invention relates to of expression.
Fig. 2 is the local pie graph that is illustrated in the variation of the 1st embodiment that is provided with baffle plate in the bio-oxidation handling part.
Fig. 3 is the whole pie graph that is illustrated in the variation of the 1st embodiment that is provided with carrier in the bio-oxidation handling part.
Fig. 4 is the whole pie graph that nitrifying groove is divided into the 2nd a plurality of embodiments of the wastewater treatment equipment that the present invention relates to.
Fig. 5 is the whole pie graph of variation of the 2nd embodiment that returns the place that has changed collection part and the gaseous constituent lysate of gas.
Fig. 6 is can be with the whole pie graph of variation that the place is applicable to the 2nd embodiment in each place that returns of the absorption portion of gas and gaseous constituent lysate.
Fig. 7 is provided with N 2The whole pie graph of the variation of O determinator and the 1st embodiment shown in Figure 1 that can control according to measured value.
Fig. 8 be the wastewater treatment equipment that the present invention relates to use the whole pie graph of biological reaction tank as the 3rd embodiment of bio-oxidation handling part.
Fig. 9 is the whole pie graph of variation that the place changes the 3rd embodiment of nitrifying groove into that returns with the treating water of biological reaction tank.
Figure 10 is the whole pie graph of variation that the place changes the 3rd embodiment of the tank that is untreated into that returns with the treating water of biological reaction tank.
Figure 11 is to use the whole pie graph of the reactive tank of the structure with carrier as the variation of the 3rd embodiment of biological reaction tank.
Embodiment
Below, embodiment of the present invention is 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, reaches the final tank 13 as equipment for separating liquid from solid.Waste water such as water are directed in the denitrifying tank 11 as untreated water, and the reduction of in denitrifying tank 11, under anaerobic state, carrying out untreated water through denitrifying bacteria is handled.Processed water through denitrifying tank 11 imports in the nitrifying groove 12.In nitrifying groove 12, make processed water be exposed to gas diffusion tube 15 through being arranged on the bottom from the air that gas blower 16 is supplied with, processed water keeps aerobic conditions.And, in this aerobic conditions, carry out oxide treatment through nitrobacteria.Oxidized nitrification liquid imports in the final tank 13 in nitrifying groove 12, in final tank 13, carries out nitrification liquid is separated into the solid-liquid separation of treating water and active sludge.In addition, the part of nitrification liquid turns back in the denitrifying tank 11 through pump 17.In addition, the part of isolating active sludge sends back in the denitrifying tank 11 through pump 18, keeps the living weight in the denitrifying tank 11.Residual active sludge is discharged to outside the 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 will be from the N that contains of denitrifying tank 11 and nitrifying groove 12 2The collection and confinement of gases of O.22 pairs of gases of collecting through this collection and confinement of gases mechanism 21 of bio-oxidation handling part carry out bio-oxidation to be handled, and makes N 2O is transformed into NO 3
In this embodiment, bio-oxidation handling part 22 is made up of with nitrifying groove 12 sprinkler system 23 that gaseous constituent is dissolved in the water to the gas watering of collecting through collection and confinement of gases mechanism 21.And, turn back in the nitrifying groove 12 through the water that will be dissolved with gaseous constituent and to carry out oxide treatment, make N 2O is transformed into NO 3
In above-mentioned formation, untreated water flow in the denitrifying tank 11 of anaerobic state, and organism is decomposed, and then, the treating water of denitrifying tank 11 is transported in the nitrifying groove 12 of aerobic conditions.The part of the nitrification liquid that in nitrifying groove 12, is processed turns back in the denitrifying tank 11 via the circulation path, and remainder is transported in the final tank 13.In nitrifying groove 12; The air of supplying with from gas blower 16 spreads through gas diffusion tube 15, under the aerobism condition, through the nitrobacteria as the aerobism mikrobe in the active sludge; Ammonium-nitrogen in the waste water is oxidized, is transformed into nitrite nitrogen and nitrate ammonia.In addition, the organism in the waste water that in denitrifying tank 11, has been untreated is broken down into water and carbonic acid gas.
Nitrification liquid from this nitrifying groove 12 is recycled to through the circulation path with pump 17 in the denitrifying tank 11 of leading portion, and therefore, in denitrifying tank 11, nitrite nitrogen and nitrate ammonia are reduced by denitrifying bacteria, generates 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 handled as intermediate product and is generated N 2O (nitrous oxide).N 2O gas is not to generate often, but produces when in denitrifying tank 11, incomplete denitrogenation taking place.In addition, the incomplete N that produces when nitrated takes place in nitrifying groove 12 2O.Not exclusively denitrogenation is former thereby take place because of the sneaking into of dissolved oxygen, the nitric acid load is too high, denitrifying bacteria utilizes organism deficiency etc.Former thereby generation such as the hypoxgia that incomplete nitrated reason ammonia load/organic loading height causes.Also exist because of other reasons generation N 2The possibility of O still, is thought in most cases, and above-mentioned 2 reasons are major causes.
The N that generates 2O gas accumulates in the headspace of nitrifying groove 12 and denitrifying tank 11 with air or other generation gas.If this N 2O gas is directly released in the atmosphere, then as stated, global warming takes place.Therefore, collection and confinement of gases mechanism 21 is with N 2The O collection and confinement of gases.Through the contain N of collection and confinement of gases mechanism 21 from denitrifying tank 11 and nitrifying groove 12 collections 2The gas of O is transported in the bio-oxidation handling part 22.
Bio-oxidation handling part 22 is by containing N 2Sprinkler system 23 on the circulation path of the gas of O constitutes with nitrifying groove 12.Sprinkler system 23 sprays the nitrification liquid that passes through pump 24 supplies of discharging from nitrifying groove 12.Therefore, collection contains 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 the nitrifying groove 12.Then, in nitrifying groove 12, carry out bio-oxidation and handle N 2O becomes NO 3
What in denitrifying tank 11 and nitrifying groove 12, produce thus, contains N 2The gas dissolving of O is in the nitrification liquid that sprays through the sprinkler system 23 that constitutes bio-oxidation handling part 22.Then, N 2O in nitrifying groove 12 once more by the nitrobacteria oxidation.Therefore, the N in the gas 2The amount of O reduces significantly.That is, can be with the N in the gas 2O handles in the treatment system of nitrated/denitrogenation.Thus, need not be used for the N that produces from wastewater treatment equipment 2The special device of O gas harmlessization through in existing device, only appending collection and confinement of gases mechanism 21 and constituting the simple formation of the sprinkler system 23 of bio-oxidation handling part 22, just can effectively reduce the N that discharges into the atmosphere 2The amount of O gas.
In addition, the nitrification liquid that sprays from the sprinkler system of bio-oxidation handling part 22 23, with zone that gas through 21 collections of collection and confinement of gases mechanism contacts, in order to increase their gas-to-liquid contact area, for example baffle plate as shown in Figure 2 25 can be set.Through baffle plate 25 contact area of gas-liquid is increased, contain N 2The gas of O increases to the dissolved efficiency of nitrification liquid.In addition, gas also can be collected through fan by collection and confinement of gases mechanism 21.And the liquid of sprinkling is not limited to nitrification liquid, also can be in final tank 13, from nitrification liquid, to separate the treating water obtain or common tap water.
(variation of the 1st embodiment)
Fig. 3 representes the variation of the 1st embodiment.Bio-oxidation handling part 22 turns back at the liquid that sprays from sprinkler system 23 has the aerobism of adhering to microorganism carrier 26 in the path the nitrifying groove 12.That is, as shown in the figure, be used to adhere to aerobism microorganism carrier 26 in the configuration of the bottom of sprinkler system 23.The material of carrier 26 can be any material, preferably use the aerobism mikrobe to adhere to effectively and material with air permeability as carrier 26.For example use the aggregate of plastics system small pieces that surface working is become uneven surface as carrier 26.
If so constitute, then contain N through making to have dissolved 2The nitrification liquid of the gas of O contacts with carrier 26, can be to N attached to the aerobism mikrobe on the carrier 2O handles, 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, and omit relative detailed description for the parts identical with the 1st embodiment.In this embodiment, nitrifying groove 12 is divided into a plurality of zones that comprise 12A of leading portion portion and the 12B of back segment portion on the processing direction.Being divided into a plurality of zones constitutes according to the mode that processed water can circulate.In the example of figure, nitrifying groove 12 is divided into 2 on the processing direction, have 12A of leading portion portion and the 12B of back segment portion.Above-mentioned leading portion 12A of portion and the 12B of back segment portion constitute according to the mode that processed water can circulate.In addition, gas diffusion tube 15 commonly is provided with respect to 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 through the nitrification liquid that sprinkler system 23 sprays from nitrifying groove 12, is dissolved in the nitrification liquid gaseous constituent for the gas of collecting, and then, makes the nitrification liquid that has dissolved gaseous constituent turn 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 through the nitrification liquid that sprinkler system 23 sprays from nitrifying groove 12, is dissolved in the nitrification liquid gaseous constituent for the gas of collecting, and then, makes the nitrification liquid that has dissolved gaseous constituent turn back to the 12A of leading portion portion of nitrifying groove 12.
Here, compare with the 12B of back segment portion at the 12A of leading portion portion and contain N 2Under the generation of the gas of the O situation how, as shown in Figure 4, collect gas at the 12A of leading portion portion of nitrifying groove 12, make the nitrification liquid that has dissolved gas turn back to the 12B of back segment portion.That is, in denitrifying tank 11, taken place to generate N as stated under the situation of incomplete reaction 2O.This N 2The part of O is dissolved in the 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 the water 2O is discharged in the gas through the bubbling that is caused by gas diffusion tube 15, becomes to contain N 2The gas of O.Therefore, from the N that contains near the 12A of leading portion portion of denitrifying tank 11 2The generation of the gas of O is recently from the N that contains of the 12B of back segment portion 2The generation of the gas of O is many.Under these circumstances, the wastewater treatment equipment of Fig. 4 N in the denitrification reaction process, generating effectively 2O handles, and can suppress N effectively 2The burst size of O.
With respect to this, compare with the 12A of leading portion portion at the 12B of back segment portion and to contain N 2Under the generation of the gas of the 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 among the 12A of leading portion portion.That is, organic oxidation takes place in nitrifying groove 12, enter into back segment, nitration reaction is strong more.Known the carrying out that is accompanied by this nitration reaction, generation contains N 2The gas of O is (for example with reference to JP, P1998-128389).Therefore, the wastewater treatment equipment of Fig. 5 will be at the N of the 12B of back segment portion generation 2The O collection and confinement of gases makes N 2O turns back to the 12A of leading portion portion, with N 2The O oxidation.According to this wastewater treatment equipment, can be effectively with the N that in nitrifying process, produces 2The O oxidation.
Adopt in the formation of formation and Fig. 5 of above-mentioned Fig. 4 which, can confirm based on each characteristic as wastewater treatment equipment.Any makes N in constituting 2O is dissolved in the liquid, makes to have dissolved N 2The liquid of O flows in the nitrifying groove 12, can be with dissolved N again 2O oxidation and generate nitric acid.
In addition, will make N 2It is the full water structure with U word shape portion as shown in the figure that O is dissolved in the pipeline that the nitrification liquid in the liquid flow in the nitrifying groove 12, has prevented the adverse current from the gas of inflow side.
In addition, the 12B of back segment portion among Fig. 4 of nitrifying groove 12, the 12A of leading portion portion that reaches among Fig. 5 are described with air-tight state in figure separately, still, in fact, are formed with the air that makes from gas diffusion tube 15 ejections and are 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, comprise the pipeline of full water structure and the 12B of back segment portion or the 12A of leading portion portion of the nitrifying groove 12 that the nitrification liquid that dissolved gaseous constituent flows into from this pipeline constituted with U word shape portion.
(variation of the 2nd embodiment)
Fig. 6 representes the variation of above-mentioned the 2nd embodiment.Nitrifying groove 12 is divided into a plurality of zones that comprise 12A of leading portion portion and the 12B of back segment portion on the processing direction.Nitrifying groove 12 has 12A of leading portion portion and the 12B of back segment portion.12A of leading portion portion and the 12B of back segment portion constitute by the mode of the processed water that can circulate.
In 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.Through the 21A of collection and confinement of gases mechanism, 21B, can be from any one collection gas of 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 of passing through the 21A of collection and confinement of gases mechanism, 21B.After the downstream side process full water portion of this sprinkler system 23, link with the 12B of back segment portion via open and close valve 32A, and link with the 12A of leading portion portion via open and close valve 32B.That is the nitrification liquid that, has dissolved gaseous constituent can turn back in any one in 12B of back segment portion and the leading portion portion 12.In addition, be communicated with the deodorizing equipment of outside etc. via corresponding with 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.Bio-oxidation handling part 22 by sprinkler system 23, have full water portion and open and close valve 32A, 32B pipeline, the 12A of leading portion portion and the 12B of back segment portion of the nitrifying groove 12 that the nitrification liquid that dissolved gaseous constituent flows into from this pipeline are constituted.
And then wastewater treatment equipment has contained N the gas that 12A of leading portion portion and the 12B of back segment portion from nitrifying groove 12 are produced 2The determinator 35 that O concentration is measured.Contained N in gas from the 12A of leading portion portion 2Contained N in the gas of O concentration ratio from the 12B of back segment portion 2Under the high situation of O concentration, determinator 35 is opened open and close valve 31A through not shown unit, closes open and close valve 31B, collects from the gas of 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, make the nitrification liquid that has dissolved gaseous constituent turn back to the 12B of this back segment portion.And then, open vent valve 33A, close vent valve 33B, the gaseous constituent that is not dissolved into from the nitrification liquid that sprinkler system 23 sprays is discharged to odor removal.
With respect to this, contained N in gas from the 12B of back segment portion 2Contained N in the gas of O concentration ratio from the 12A of leading portion portion 2Under the high situation of O concentration, determinator 35 is opened open and close valve 31B through not shown unit, closes open and close valve 31A, collects from the gas of 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 dissolved gaseous constituent is turned back among the 12A of leading portion portion.Open vent valve 33B, close vent valve 33A, the gaseous constituent that is not dissolved into from the nitrification liquid that sprinkler system 23 sprays is discharged to odor removal.
That is, this wastewater treatment equipment is measured the N from the gas that the nitrifying groove 12A of leading portion collects 2O concentration reaches the N from the gas that the nitrifying groove 12B of back segment collects 2O concentration is collected and is dissolved into the nitrification liquid the gas that produces from the high nitrifying groove 12A of measured value or nitrifying groove 12B.In addition, wastewater treatment equipment makes the nitrification liquid that has dissolved gas flow to measured value low nitrifying groove 12B or 12A.Thus, wastewater treatment equipment can effectively be handled the N that in denitrification reaction process and nitration reaction process, produces 2O can suppress N effectively 2The release of O.
In addition, wastewater treatment equipment also can be the N that measures from the gas that the nitrifying groove 12A of leading portion collects 2O concentration reaches the N from the gas that the nitrifying groove 12B of back segment collects 2O concentration with the collection of gas ground and the leading portion 12A that confirms as nitrifying groove respectively of the nitrification liquid that has dissolved gas and any one the formation among the back segment 12B, is not limited to illustrated formation with sending back to.
In the above-described embodiment, illustration the number of partitions of nitrifying groove 12 be 2 situation, still, number of partitions can be for more than 3.In this case, leading portion portion can be an any part so long as get final product near the division position of a side of denitrifying tank 11, and leading portion portion is meant the division position adjacent with denitrifying tank 11.In addition, back segment portion is so long as get final product with respect to the back segment portion of leading portion portion, can be position arbitrarily, and back segment portion may not be meant the discharge section of nitrifying groove 12.
In addition, in the 2nd embodiment and variation thereof, also can be arranged on the baffle plate 25 and the aerobism microorganism carrier 26 that are used to increase the gas-liquid area explained as variation in the 1st embodiment.In addition, the liquid that sprays from sprinkler system 23 is not limited to nitrification liquid, can be treating water or tap water from final tank 13.
(variation of the 1st embodiment)
Fig. 7 representes the variation of embodiment shown in Figure 1.Wastewater treatment equipment has the N of the gas of measuring 21 collections of collection and confinement of gases mechanism 2The determinator 37 and the unit 38 of O concentration.N through determinator 37 mensuration 2O concentration is imported in the unit 38, with predefined value, be N 2The O concentration target value compares.At N 2O concentration determination value surpasses under the situation of predefined value, and unit 38 is implemented the mode control pump 24 of watering according to sprinkler system 23.That is, measure the N that collects in the gas 2O concentration only when measured value is higher than target value set, makes pump 24 work of watering usefulness, and nitrification liquid is with N 2O gas dissolves again.Thus, can reduce the running cost of the pump 24 of watering usefulness.
In addition, unit 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 usefulness, adjustment watering amount.And then, also can be according to the N that measures 2O concentration, control gas blower 16, adjustment is for the aeration rate of nitrifying groove 12.
The wastewater treatment equipment of this variation is according to collecting contained N in the gas 2The measured value of O is controlled, and therefore can prevent useless running, uses effectively.
(the 3rd embodiment)
Fig. 8 representes the 3rd embodiment.In addition, for giving identical Reference numeral, omit detailed description about it with the same parts of each above-mentioned embodiment.
About denitrifying tank 11, nitrifying groove 12, as the final tank 13 of equipment for separating liquid from solid, from the circulation path of nitrifying groove 12 to denitrifying tank 11; Identical with the parts of above-mentioned each embodiment, give identical Reference numeral for device identical and parts with them.
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.Emit from gas diffusion tube 45 from the air of gas blower 46 air-supplies, the processed water in the biological reaction tank 22A is exposed in the air.
Collected by collection and confinement of gases mechanism 21 from the gas of denitrifying tank 11 and nitrifying groove 12 generations, be blown in the processed water in the biological reaction tank 22A through fan 48.In addition, as the processed water in the biological reaction tank 22A, can batch-type ground adopt processed water in the processed water prepared in addition or the denitrifying tank 11 as shown in Figure 8, or nitrifying groove 12 as shown in Figure 9 in processed water.
N by the generation of the denitrification reaction in nitration reaction in the nitrifying groove 12 and the denitrifying tank 11 2O gas and foul smell are directly imported among the 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 the nitrifying groove 12 to the treating water batch-type that produces by biological respinse among the 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 foul smell such as hydrogen sulfide and ammonia gas.Thus, wastewater treatment equipment can carry out N simultaneously 2The processing of O and the deodorizing of foul smell are handled.The organic loading of biological reaction tank 22A and nitrogen load are compared low with nitrifying groove 12, therefore be difficult to take place incomplete oxidation, can expect N more completely 2The oxide treatment of O.In addition, treating water to send the place back to shown in figure 10 can be the tank (not shown) that is untreated.
(variation of the 3rd embodiment)
Figure 11 representes the variation of the 3rd above-mentioned embodiment.What have the short transverse pars intermedia that is configured in the 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 through final tank 13 from the isolating treating water of nitrification liquid.Collected by collection and confinement of gases mechanism 21 from the gas that denitrifying tank 11 and nitrifying groove 12 produces, supply to the following side space of carrier 51, from bottom to up the configuration section through this carrier 51 through fan 48.
Carrier 51 is that to have adhered to be main aerobism microorganism carrier with the nitrobacteria.That collects contains N 2The gas of O passes through from the inside of reactive tank 22B from bottom to up, thereby can pass through attached to the aerobism mikrobe on the carrier 51 N 2O is oxidation effectively.In this case, the gas of collecting through collection and confinement of gases mechanism 21 is blown into the following side space of carrier 51, therefore be blown into liquid in situation compare, can reduce the charge capacity of fan 48, operating cost reduces.
In addition, the mode that sends back in the denitrifying tank 11 according to the treating water that in biological reaction tank 22B, produces constitutes.In addition, the place of sending back to of treating water also can be the nitrifying groove 12 or the tank that is untreated.
In above-mentioned each embodiment, the nitrification liquid that in nitrifying groove 12, has carried out oxide treatment through nitrobacteria separates into treating water and active sludge through 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 is provided with membrane filter appts, and this membrane filter appts with solid and liquid separation, takes out isolating treatment solution in nitrifying groove 12.In this case, likewise the part of nitrification liquid is sent back to the denitrifying tank 11 from nitrifying groove 12 with each above-mentioned embodiment.In addition, in nitrifying groove 12, accumulated through membrane filter appts and separated the active sludge that obtains, therefore, this active sludge of accumulating has been extracted out.The active sludge of extracting out and each above-mentioned embodiment are same, and its part is sent back in the denitrifying tank 11, and remainder is discharged to outside the device as excess sludge.
Like this; In each embodiment of the present invention and variation thereof; Untreated water is reduced processing through denitrifying bacteria in the denitrifying tank of anaerobic state, by aeration, in the nitrifying groove of aerobic conditions, carry out oxide treatment through nitrobacteria through the processed water of this denitrifying tank.The N that contains through these biological processes generations 2The gas of O is collected by collection and confinement of gases mechanism, and the gas of being collected by collection and confinement of gases mechanism is carried out oxide treatment.Through this oxide treatment, N 2O is transformed into NO 3Therefore, in each embodiment of the present invention and variation thereof, can suppress N effectively through utilizing existing device 2O emits to atmosphere.
Though several embodiments of the present invention is illustrated,, these embodiments are to propose as an example, are not that intention limits scope of the present invention.These new embodiments can be implemented by other variety of ways, in not breaking away from the scope of inventing main idea, can carry out various omissions, replacement, change.These embodiments and distortion thereof are also contained in scope of the present invention and the main idea, and are included in the invention and equal scope thereof of claims record.

Claims (20)

1. the biological processes method of a waste water is characterized in that,
Untreated water is reduced processing through denitrifying bacteria in the denitrifying tank of anaerobic state,
The processed water that will pass through said denitrifying tank carries out oxide treatment through nitrobacteria in the nitrifying groove of aerobic conditions,
Will said reduction handle or said oxidation processes in produce contain N 2The gas of O is collected with collection and confinement of gases mechanism,
The gas dissolving that to collect through said collection and confinement of gases mechanism in liquid, then,
Liquid to being dissolved with gas carries out oxide treatment, makes N 2O is transformed into NO 3
2. wastewater treatment equipment is characterized in that possessing:
Denitrifying tank, it reduces processing through denitrifying bacteria with untreated water in anaerobic state;
Nitrifying groove, its processed water that will pass through said denitrifying tank carries out oxide treatment through nitrobacteria in utilizing the aerobic conditions of aeration;
Equipment for separating liquid from solid, it will separate into treating water and active sludge through the nitrification liquid of oxide treatment;
Collection and confinement of gases mechanism, its be collected in that said reduction is handled or the process of said oxide treatment in produce contain N 2The gas of O; And
Bio-oxidation handling part, its gas dissolving that will collect through said collection and confinement of gases mechanism and then carry out oxide treatment to the liquid that is dissolved with said gas in liquid, make N 2O is transformed into NO 3
3. wastewater treatment equipment according to claim 2 is characterized in that,
Said bio-oxidation handling part constitutes by making gaseous constituent be dissolved into the sprinkler system in the water to the gas watering of collecting through said collection and confinement of gases mechanism and will being dissolved with the said nitrifying groove that the water of this gaseous constituent returns, and in said nitrifying groove, the water that is dissolved with said gaseous constituent is carried out oxide treatment.
4. wastewater treatment equipment according to claim 3 is characterized in that,
Said nitrifying groove is divided into a plurality of zones that comprise leading portion portion and back segment portion on the processing direction, said a plurality of zones constitute according to the mode of the processed water that can circulate,
Said collection and confinement of gases mechanism from the said leading portion portion of said nitrifying groove with collection and confinement of gases; The water that said bio-oxidation handling part will be dissolved with gaseous constituent turns back to the said back segment portion of said nitrifying groove, in said nitrifying groove, the water that is dissolved with said gaseous constituent is carried out oxide treatment.
5. wastewater treatment equipment according to claim 3 is characterized in that,
Said nitrifying groove is divided into a plurality of zones that comprise leading portion portion and back segment portion on the processing direction, a plurality of zones constitute by the mode of the processed water that can circulate,
With collection and confinement of gases, the water that said bio-oxidation handling part will be dissolved with gaseous constituent turns back in the said leading portion portion of nitrifying groove from the said back segment portion of nitrifying groove in said collection and confinement of gases mechanism, in nitrifying groove, will be dissolved with the water oxidation of said gaseous constituent.
6. wastewater treatment equipment according to claim 3 is characterized in that,
Said nitrifying groove is divided into a plurality of zones that comprise leading portion portion and back segment portion on the processing direction, said a plurality of zones constitute by the mode of the processed water that can circulate,
Said collection and confinement of gases mechanism has the banded open and close valve respectively with said leading portion portion and said back segment portion, can collect said gas from any one of said leading portion portion and said back segment portion,
Said bio-oxidation handling part has and said back segment portion and leading portion portion difference banded open and close valve, and the water that is dissolved with said gaseous constituent is turned back in any one of said 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 of the gas that mensuration produces from said leading portion portion 2The N of O concentration and the gas that produces from said back segment portion 2The determinator of O concentration,
At N from the gas of said leading portion portion 2The O concentration ratio is under the high situation of the gas of said back segment portion; The said open and close valve that will lead to the said collection and confinement of gases mechanism of said leading portion portion is opened; Said collection and confinement of gases mechanism collects from the gas of said leading portion portion; And the open and close valve that will lead to the said bio-oxidation handling part of said back segment portion is opened, and makes the water that is dissolved with said gaseous constituent turn back to said back segment portion
At N from the gas of the said back segment portion of said nitrifying groove 2The O concentration ratio is under the high situation of the gas of said leading portion portion; The said open and close valve that will lead to the said collection and confinement of gases mechanism of said back segment portion is opened; Said collection and confinement of gases mechanism collects from the gas of said back segment portion; And the open and close valve that will lead to the said bio-oxidation handling part of said leading portion portion is opened, and the water that said bio-oxidation handling part will be dissolved with said gaseous constituent turns back to leading portion portion.
8. wastewater treatment equipment according to claim 3 is characterized in that, said bio-oxidation handling part has the baffle plate that the gas-to-liquid contact area of the water that is used to make sprinkling and the gas of collecting through said collection and confinement of gases mechanism increases.
9. wastewater treatment equipment according to claim 3 is characterized in that, said bio-oxidation handling part has the aerobism of adhering to microorganism carrier in that the water that is dissolved with said gaseous constituent is turned back in the path in the nitrifying groove.
10. wastewater treatment equipment according to claim 3 is characterized in that, the water that said sprinkler system sprays is the nitrification liquid that takes out from said nitrifying groove.
11. wastewater treatment equipment according to claim 3 is characterized in that, the water that said sprinkler system sprays is for separating the treating water that obtains from said nitrification liquid.
12. wastewater treatment equipment according to claim 3 is characterized in that, this wastewater treatment equipment further has: determinator, it measures the N of the gas that said collection and confinement of gases mechanism collects 2O concentration; And control part, the N that it is being measured 2O concentration surpasses makes said sprinkler system implement watering under the situation of predefined value.
13. wastewater treatment equipment according to claim 3 is characterized in that, this wastewater treatment equipment further has: determinator, it measures the N of the gas that said collection and confinement of gases mechanism collects 2O concentration; And control part, it is according to the N that measures 2O concentration is adjusted the watering amount of said sprinkler system.
14. wastewater treatment equipment according to claim 3 is characterized in that, this wastewater treatment equipment further has: determinator, it measures the N of the gas that said collection and confinement of gases mechanism collects 2O concentration; And control part, it is according to the N that measures 2The adjustment of O concentration is for the aeration rate of nitrifying groove.
15. wastewater treatment equipment according to claim 2; It is characterized in that; Said bio-oxidation handling part has the biological reaction tank that the processed water aeration is carried out a biological disposal upon, and the gas of collecting through said collection and confinement of gases mechanism is blown in the processed water in the said biological reaction tank.
16. wastewater treatment equipment according to claim 15 is characterized in that, the processed water of the said biological reaction tank that uses as said bio-oxidation handling part uses the liquid in the said denitrifying tank.
17. wastewater treatment equipment according to claim 15 is characterized in that, the processed water of the said biological reaction tank that uses as said bio-oxidation handling part uses the liquid in the said nitrifying groove.
18. wastewater treatment equipment according to claim 2; It is characterized in that; Said bio-oxidation handling part has: possess biological reaction tank that separates the sprinkler system that the treating water that obtains sprays from top from said nitrification liquid and the configuration of the short transverse pars intermedia in said biological reaction tank adhered to the aerobism microorganism carrier; The gas of collecting through said collection and confinement of gases mechanism supplies to the following side space of the said carrier in the said biological reaction tank, and the below spatial gas that supplies to said carrier is from bottom to top through said bearer configuration part.
19. wastewater treatment equipment according to claim 9 is characterized in that, the said gas that said collection and confinement of gases mechanism collects passes through from said carrier.
20. wastewater treatment equipment according to claim 3 is characterized in that, in the water that will be dissolved with said gaseous constituent turns back to the path of said nitrifying groove, possesses the full water structure with U word shape portion.
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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