CN102826656A - Industrial sewage deep denitrifying and recycling process - Google Patents
Industrial sewage deep denitrifying and recycling process Download PDFInfo
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Abstract
The invention relates to an industrial sewage deep denitrifying and recycling process. Aiming at the problems of the existing prepositioned denitrification or synchronous denitrification denitrifying process that the denitrification is not complete and total nitrogen content of output water is higher, the invention provides an O/A/O (Oxic/Anoxic/Oxic) process and a first-grade aerobic tank and an anaerobic tank are respectively controlled to optimal conditions needed by nitrification and denitrification, so that nitrification, carbonization and denitrification processes can be completely finished; a residual carbon source of denitrification is decomposed in a second-grade aerobic tank; and the tank is internally provided with an ultra-filtration membrane to replace a sedimentation basin. The industrial sewage deep denitrifying and recycling process disclosed by the invention has the characteristics of high total nitrogen content and COD (Chemical Oxygen Demand) removing rate, simple flow and convenience for controlling, is applicable to modifying the existing sewage treatment system with a total nitrogen index which does not reach to the standard, or deep denitrification treatment of industrial sewage which has high total nitrogen and insufficient carbon source, and is difficult to biologically degrade; and the output water can be used as a water resource of supplement water of circulating cooling water, and supplement water of a boiler, and has other usages.
Description
Technical field
The present invention relates to the environment protection sewage process field, particularly a kind of industrial sewage advanced nitrogen and reuse technology.
Background technology
Nitrogen is present in sewage and the most of industrial sewage, and the nitrogen that these mankind's activities produce is the major cause that causes river course, body eutrophication.Increasing the total nitrogen controlling index has become the important content of country and the revision of local sewage drainage standard; One-level/secondary total nitrogen index like " urban wastewater treatment firm pollutant emission standard " GB18918-2002 is 15/20mg/L, and the one-level of " Shanghai City integrated wastewater discharge standard " DB31/199-2009/secondary total nitrogen index is 25/35mg/L.
The existence form of nitrogen is divided into inorganic nitrogen and organonitrogen in the sewage, and inorganic nitrogen comprises ammonia nitrogen and nitric nitrogen.Ammonia nitrogen accounts for the overwhelming majority in the sewage of life and production process discharging, secondly is organonitrogen, and except the special industry of part, nitrate nitrogen content is less.Ammonia nitrogen concentration generally adopts biological process to handle during less than 500 mg/L.The principle of utilizing biological process to remove nitrogen is: under aerobic condition, organonitrogen at first is oxidized to ammonia nitrogen, and nitrifier is a carbon source with the inorganic carbon then, makes ammonia nitrogen generation nitration reaction, generates nitrite and nitrate salt, the general name nitric nitrogen; Under anaerobism or anoxia condition, denitrifying bacteria utilizes organism in the sewage as electron donor, as electron acceptor(EA), nitrate-nitrogen reduction is become nitrogen with nitric nitrogen, realizes thorough denitrogenation.It is thus clear that the required condition of nitrification and denitrification is diverse.Nitration reaction requires that competent DO is arranged, and DO is high more, and nitrated rate is high more; Nitrated suitable pH is 7.0 ~ 8.5, and pH is high more, and nitrated rate is high more.And DO has restraining effect to denitrification, and DO is low more, and the denitrification rate is high more; The suitable pH of denitrification is 7.0 ~ 7.5.So, have only two processes are isolated, be controlled under the different reaction conditions, could realize best denitrification effect.
But, in order to utilize the carbon source in the water inlet, reduce additional carbon in the denitrification stage, reduce running cost, existing denitrification process like A/O, A/O/A/O, SBR and oxidation ditch etc., is Prepositive denitrification, from the Aerobic Pond water outlet.So nitric nitrogen concentration is higher in the water outlet, nitrogen removal rate is lower.In order to improve the denitrification rate, reduce nitrate nitrogen content in the water outlet, need to improve the reflux ratio of mixed solution.And the reflux ratio of raising mixed solution causes energy consumption to increase on the one hand, causes the DO of anoxic pond to raise on the other hand, influences denitrification rate.
Obtained the short-cut nitrification and denitrification denitrification process applied in recent years; Its denitrogenation principle is: the DO of control biochemistry pool is between 0.05～0.5 mg/L; The nitrification and denitrification process is taken place simultaneously; Denitrifying bacteria utilizes nitrite nitrogen as electron acceptor(EA), after promptly ammonia nitrogen is converted into nitrite, is reduced into nitrogen immediately.According to Theoretical Calculation, this technology reduces by about 25% oxygen requirement than complete nitrification-denitrification process, reduces by 40% carbon source, relatively is fit to the denitrogenation processing of low c/n value sewage.But practical application shows, DO is during less than 0.5 mg/L, and nitrogen and COD clearance than difficult for biological degradation in the industrial sewage are all lower, can't satisfy the control requirement of water outlet total nitrogen.
The industry of discharging high-concentration ammonia nitrogenous wastewater has: chemical fertilizer, iron and steel, oil refining, inorganic chemical industry and pharmacy etc., and the total nitrogen of existing Sewage treatment systems water outlet is higher, and after China carries out the control of water outlet total nitrogen comprehensively, these enterprises will be faced with system reform upgrading.
Anti-nitration reaction need utilize the organism (BOD in the sewage) that is easy to degrade as electron donor, reduces 1gNO in theory
2 --N needs 1.71gBOD, reduction 1gNO
3 --N needs 2.86gBOD, and actual requirement of engineering has certain surplus.Water outlet for existing sewage water denitrification system generally only contains a small amount of hardly degraded organic substance, and the content of BOD is very low, can not satisfy the denitrifying needs of contained nitric nitrogen in the sewage, even adopt A/O technology to need additional carbon, and denitrogenation is still not thorough yet.Equally; High for total nitrogen, carbon source is not enough and than the industrial sewage of difficult for biological degradation; The carbon source that can supply denitrification to utilize in the sewage is also few, adopts traditional A/O denitrification process also to need additional carbon, and needs to adopt A/O/A/O technology just can reach higher nitrogen removal rate; The energy consumption of twice mixed-liquor return is higher, controls complicated.
Summary of the invention
The object of the present invention is to provide a kind of industrial sewage advanced nitrogen and reuse technology; It mainly solves existing Prepositive denitrification or the denitrogenation of synchronous denitrification denitrification process is not thorough, water outlet total nitrogen problem of higher; Be total nitrogen index existing Sewage treatment systems not up to standard simultaneously; Or total nitrogen is high, carbon source is not enough and than the transformation of difficult for biological degradation process sewer the technical solution scheme is provided; It is specially adapted to the transformation of total nitrogen index existing Sewage treatment systems not up to standard, and perhaps total nitrogen is high, carbon source is not enough and handle than the advanced nitrogen of the industrial sewage of difficult for biological degradation, but water source and other purposes of recirculated cooling water make up water, boiler replenishing water are made in the water outlet reuse.
The present invention solves the problems of the technologies described above the technical scheme that is adopted.
A kind of industrial sewage advanced nitrogen and reuse technology, it is handled in the system that is made up of first step Aerobic Pond, anoxic pond, second stage Aerobic Pond and product water pump; It is characterized in that: sewage is introduced into first step Aerobic Pond, and the nitrated mixed solution of first step Aerobic Pond gets into anoxic pond, and the anoxic pond mixed solution gets into second stage Aerobic Pond, and the water outlet of system is extracted out from membrane module by the product water pump and delivered to the user; Wherein: first step Aerobic Pond is provided with the air line that installs first air flow controller additional, install the first flux of alkaline liquor unit additional add alkali pipeline, a DO determinator and first pH meter; The one DO determinator is control first air flow controller automatically, makes DO at 0.5 ~ 2.0 mg/L, and first pH meter is the control first flux of alkaline liquor unit automatically; Make pH 7.5 ~ 8.5; In first step Aerobic Pond, organonitrogen and ammonia nitrogen change into nitric nitrogen, and organism resolves into CO
2And water; First step Aerobic Pond (1) exit is provided with nitrite and nitrate salt determinator; Nitrite and nitrate salt determinator and a DO determinator are controlled first air flow controller of first step Aerobic Pond jointly; Make in the nitration product nitrite content higher; Carbon source demand amount when reducing denitrification, nitrite and nitrate salt determinator are controlled the carbon source flow director of anoxic pond simultaneously; Anoxic pond be provided with the carbon source that installs the carbon source flow director additional add pipeline, install the acid solution flow director additional add acid tube road, second pH meter and submersible agitator; Second pH meter is controlled the acid solution flow director automatically; Make pH 7.0 ~ 7.5, submersible agitator makes nutritive medium and acid solution is quick and nitrated mixed solution uniform mixing; In anoxic pond, nitrate-nitrogen reduction becomes nitrogen; Second stage Aerobic Pond is provided with air line and the 2nd DO determinator that installs second air flow controller additional, and the 2nd DO determinator is control second air flow controller automatically, makes DO at 0.5 ~ 2.0 mg/L, and remaining carbon source is obtained decomposing; In the Aerobic Pond of the second stage hyperfiltration membrane assembly is installed, the water outlet of system is extracted out from hyperfiltration membrane assembly by producing water pump; The mud of second stage Aerobic Pond is back to anoxic pond or first step Aerobic Pond by sludge pumping, on a small quantity as excess sludge discharge.
Described industrial sewage advanced nitrogen and reuse technology; It is characterized in that: when influent ammonium concentration is higher, be provided with airlift in the first step Aerobic Pond, the mixed-liquor return that first step Aerobic Pond is terminal is to front end; To reduce inlet segment ammonia nitrogen and COD concentration, help nitration reaction; The quantity of reflux of airlift is controlled by the 3rd air flow controller.
Described industrial sewage advanced nitrogen and reuse technology; It is characterized in that: the water outlet of system also gets into security personnel's strainer and reverse osmosis system after being extracted out from membrane module by the product water pump; When saltiness can not reach the reuse water index in the Aerobic Pond water outlet of the second stage, all or part of water outlet gets into security personnel's strainer and reverse osmosis system is further handled the back reuse.
Described industrial sewage advanced nitrogen and reuse technology is characterized in that: as alternate item, the function of first air flow controller and second air flow controller can realize through install frequency transformer additional for gas blower.
Compared with prior art; The invention has the beneficial effects as follows: treatment scheme of the present invention and controlled variable meet the principle and the reaction conditions of nitrification and denitrification; Sewage can thoroughly be accomplished nitrated and carbonization process in first step Aerobic Pond, in anoxic pond, can thoroughly accomplish denitrification process; Second stage Aerobic Pond adopts MBR technology, substitutes first step settling tank and second stage settling tank, has shortened flow process, has saved floor space; Adopt MBR technology to avoid the problem of second pond sludge bulking, prevent sludge loss, make the mud of active sludge longer age, denitrification effect is better; Be provided with nitrite and nitrate salt determinator in the first step Aerobic Pond, the may command nitrifying process occurs in the nitrosification stage, reduces the required carbon source of nitrated required air quantity and denitrification, and accurately controls the carbon source dosage of anoxic pond; Technology of the present invention need not the necessary mixed-liquor return of conventional A/O technology, saves power consumption; Water outlet can be back to production, reaches the purpose of water-saving and emission-reducing, produces good economic benefits and social benefit.
Description of drawings
Fig. 1 is the structure and the treatment scheme synoptic diagram of system of the present invention.
Embodiment
See also Fig. 1, the invention discloses a kind of industrial sewage advanced nitrogen and reuse technology.As shown in the figure: it is handled in the system that is made up of first step Aerobic Pond 1, anoxic pond 2, second stage Aerobic Pond 3 and product water pump 4.Idiographic flow is: sewage is introduced into first step Aerobic Pond 1, and the nitrated mixed solution of first step Aerobic Pond 1 gets into anoxic pond 2, and anoxic pond 2 mixed solutions get into second stage Aerobic Pond 3, and the water outlet of system is extracted out from membrane module by product water pump 4 and delivered to the user.Wherein: first step Aerobic Pond 1 is provided with the air line that installs first air flow controller 10 additional, install the first flux of alkaline liquor unit 11 additional add alkali pipeline, a DO determinator 8 and first pH meter 9; The one DO determinator 8 is control first air flow controller 10 automatically, makes DO at 0.5 ~ 2.0 mg/L, and first pH meter 9 is the control first flux of alkaline liquor unit 11 automatically; Make pH 7.5 ~ 8.5; In first step Aerobic Pond 1, organonitrogen and ammonia nitrogen change into nitric nitrogen, and organism resolves into CO
2And water; First step Aerobic Pond 1 exit is provided with nitrite and nitrate salt determinator 12; First air flow controller 10 of nitrite and nitrate salt determinator 12 and a DO determinator 8 common control first step Aerobic Ponds 1; Make in the nitration product nitrite content higher; Carbon source demand amount when reducing denitrification, nitrite and nitrate salt determinator 12 are controlled the carbon source flow director 13 of anoxic pond 2 simultaneously; Anoxic pond 2 be provided with the carbon source that installs carbon source flow director 13 additional add pipeline, install acid solution flow director 16 additional add acid tube road, second pH meter 14 and submersible agitator 15; Second pH meter 14 is control acid solution flow director 16 automatically; Make pH 7.0 ~ 7.5, submersible agitator 15 makes nutritive medium and acid solution is quick and nitrated mixed solution uniform mixing; In anoxic pond 2, nitrate-nitrogen reduction becomes nitrogen; Second stage Aerobic Pond 3 is provided with the air line and the 2nd DO determinator 17, the two DO determinators 17 that install second air flow controller 18 additional and controls second air flow controller 18 automatically, makes DO at 0.5 ~ 2.0 mg/L, and remaining carbon source is obtained decomposing; Hyperfiltration membrane assembly 7 is installed in the second stage Aerobic Pond 3, and the water outlet of system is extracted out from hyperfiltration membrane assembly 7 by producing water pump 4; The mud of second stage Aerobic Pond 3 returns to anoxic pond 2 or first step Aerobic Pond 1 by sludge pump 18, on a small quantity as excess sludge discharge.
As a kind of optional mode, when influent ammonium concentration is higher, be provided with airlift 21 in the first step Aerobic Pond 1, the mixed-liquor return that first step Aerobic Pond 1 is terminal to reduce inlet segment ammonia nitrogen and COD concentration, helps nitration reaction to front end; The quantity of reflux of airlift 21 is by 22 controls of the 3rd air flow controller.
As a kind of optional mode; The water outlet of system also gets into security personnel's strainer 5 and reverse osmosis system 6 after being extracted out from membrane module by product water pump 4; When saltiness can not reach the reuse water index in 3 water outlets of second stage Aerobic Pond, all or part of water outlet got into security personnel's strainer 5 and further handles the back reuse with reverse osmosis system 6.
As alternate item, the function of first air flow controller 10 and second air flow controller 18 can realize through install frequency transformer additional for gas blower.
Embodiment, its treatment scheme is as shown in Figure 1: the processing power in certain existing sewage-farm is 200m
3/ h, effluent quality (being this technical process influent quality) is: BOD
5: 20 mg/L, COD:100 mg/L, TN:60 mg/L, NH
3-N:15 mg/L; After utilizing technology of the present invention (not needing Aerobic Pond mixed-liquor return and reverse osmosis system) to handle, effluent quality is: BOD
5≤5 mg/L, COD≤50 mg/L, TN≤20 mg/L, NH
3-N≤5 mg/L; Wherein: the first step Aerobic Pond residence time needs 4h approximately, and wind supply quantity is 10～12 m
3/ min; The anoxic pond residence time is 1～2h, and the added methanol amount is 26～40kg/h; About 1.5～2h of the second stage Aerobic Pond residence time, the ultra-filtration membrane area that needs is about 0.8 ten thousand m
2, wind supply quantity is 6～10 m
3/ min.
In sum, being merely preferred embodiment of the present invention, is not to be used for limiting practical range of the present invention, and promptly all equivalences of doing according to the content of claim of the present invention change and modify, and all should be technological category of the present invention.
Claims (4)
1. industrial sewage advanced nitrogen and reuse technology, it is by first step Aerobic Pond (1), anoxic pond (2), second stage Aerobic Pond (3) with produce in the system that water pump (4) forms and handle; It is characterized in that: sewage is introduced into first step Aerobic Pond (1); The nitrated mixed solution of first step Aerobic Pond (1) gets into anoxic pond (2); Anoxic pond (2) mixed solution gets into second stage Aerobic Pond (3), and the water outlet of system is extracted out from membrane module by product water pump (4) and delivered to the user; Wherein: first step Aerobic Pond (1) is provided with the air line that installs first air flow controller (10) additional, install the first flux of alkaline liquor unit (11) additional add alkali pipeline, a DO determinator (8) and first pH meter (9); The one DO determinator (8) is controlled first air flow controller (10) automatically; Make DO at 0.5 ~ 2.0 mg/L; First pH meter (9) is controlled the first flux of alkaline liquor unit (11) automatically, makes pH 7.5 ~ 8.5; In first step Aerobic Pond (1), organonitrogen and ammonia nitrogen change into nitric nitrogen, and organism resolves into CO
2And water; First step Aerobic Pond (1) exit is provided with nitrite and nitrate salt determinator (12); Nitrite and nitrate salt determinator (12) and a DO determinator (8) are controlled first air flow controller (10) of first step Aerobic Pond (1) jointly; Make in the nitration product nitrite content higher; Carbon source demand amount when reducing denitrification, nitrite and nitrate salt determinator (12) are controlled the carbon source flow director (13) of anoxic pond (2) simultaneously; Anoxic pond (2) be provided with the carbon source that installs carbon source flow director (13) additional add pipeline, install acid solution flow director (16) additional add acid tube road, second pH meter (14) and submersible agitator (15); Second pH meter (14) is controlled acid solution flow director (16) automatically; Make pH 7.0 ~ 7.5, submersible agitator (15) makes nutritive medium and acid solution is quick and nitrated mixed solution uniform mixing; In anoxic pond (2), nitrate-nitrogen reduction becomes nitrogen; Second stage Aerobic Pond (3) is provided with air line and the 2nd DO determinator (17) that installs second air flow controller (18) additional; The 2nd DO determinator (17) is controlled second air flow controller (18) automatically; Make DO at 0.5 ~ 2.0 mg/L, remaining carbon source is obtained decomposing; Hyperfiltration membrane assembly (7) is installed in the second stage Aerobic Pond (3), and the water outlet of system is extracted out from hyperfiltration membrane assembly (7) by producing water pump (4); The mud of second stage Aerobic Pond (3) returns to anoxic pond (2) or first step Aerobic Pond (1) by sludge pump (18), on a small quantity as excess sludge discharge.
2. industrial sewage advanced nitrogen according to claim 1 and reuse technology; It is characterized in that: when influent ammonium concentration is higher; Be provided with airlift (21) in the first step Aerobic Pond (1); The mixed-liquor return that first step Aerobic Pond (1) is terminal to reduce inlet segment ammonia nitrogen and COD concentration, helps nitration reaction to front end; The quantity of reflux of airlift (21) is controlled by the 3rd air flow controller (22).
3. industrial sewage advanced nitrogen according to claim 1 and reuse technology; It is characterized in that: the water outlet of system also gets into security personnel's strainer (5) and reverse osmosis system (6) after being extracted out from membrane module by product water pump (4); When saltiness can not reach the reuse water index in second stage Aerobic Pond (3) water outlet, all or part of water outlet gets into security personnel's strainer (5) and reverse osmosis system (6) is further handled the back reuse.
4. industrial sewage advanced nitrogen according to claim 1 and reuse technology is characterized in that: as alternate item, the function of first air flow controller (10) and second air flow controller (18) can realize through install frequency transformer additional for gas blower.
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| CN107324614A (en) * | 2017-08-30 | 2017-11-07 | 安徽华骐环保科技股份有限公司 | A kind of mark that carries is to the technique for treating industrial wastewater for being better than the class water quality of earth's surface IV |
| CN108996840A (en) * | 2018-08-30 | 2018-12-14 | 中国葛洲坝集团水务运营有限公司 | The sewage disposal device and its method that enhanced biological nitrogen removal is combined with ceramic membrane |
| CN111533364A (en) * | 2020-04-10 | 2020-08-14 | 浙江科技学院 | Construction method for multistage efficient interception and reuse of farmland backwater nitrogen and phosphorus pollution |
| CN115893697A (en) * | 2021-09-30 | 2023-04-04 | 中国石油化工股份有限公司 | Method for denitrifying and denitrifying flue gas desulfurization wastewater, and method and device for treating refinery wastewater |
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| CN115893697A (en) * | 2021-09-30 | 2023-04-04 | 中国石油化工股份有限公司 | Method for denitrifying and denitrifying flue gas desulfurization wastewater, and method and device for treating refinery wastewater |
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