CN103663691B - Industrial device and treatment method for treating coal-gasification ammonia nitrogen wastewater by synchronous nitrification and denitrification - Google Patents
Industrial device and treatment method for treating coal-gasification ammonia nitrogen wastewater by synchronous nitrification and denitrification Download PDFInfo
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Abstract
The invention discloses an industrial device and a treatment method for treating coal-gasification ammonia nitrogen wastewater by synchronous nitrification and denitrification, belonging to the field of wastewater treatment equipment and process. The industrial device is characterized in that a plurality of aeration tubes (3) are distributed in an aeration tank (1); a settling tank (4) is built on one corner of the aeration tank (1); a mud scraper (5) is arranged in the settling tank (4); a water draining hole (8) and a backflow hole (7) are formed on the tank wall of the settling tank (4); an aeration tank water outlet (6) is formed on the wall above the settling tank (4); a separating wall vertical to the aeration tank (1) and the settling tank (4) is built with a partition wall (2) for dividing the reaction zone of the aeration tank (1) into left and right sides; a wastewater tube (12) outlet, and the backflow hole (7) and the water draining hole (8) of the settling tank (4) are formed at the same side of the partition wall (2); the aeration tank water outlet (6) is formed at the other side of the partition wall (2). The industrial device and the treatment method disclosed by the invention can effectively remove ammonia nitrogen in the wastewater, can shorten reaction time, can improve nitrification and denitrification velocity, and can reduce process structures and capital expenditure.
Description
Technical field
The full scale plant of synchronous nitration and denitrification gas treatment ammonia-nitrogen sewage and a treatment process, belong to sewage disposal device and technology field, is specifically related to a kind of full scale plant and method of gas treatment ammonia-nitrogen sewage.
Background technology
All sewage that general fertilizer plant methyl alcohol, octyl alconyl and coal gasification apparatus produce all can enter supply and discharge water factory and process, this COD of sewage
crat 300-1100mg/L, average out to 580mg/L, ammonia nitrogen between 40-179mg/L, average out to 95mg/L.The method of current process ammonia nitrogen waste water mainly contains physico-chemical processes and biological process, wherein physico-chemical processes denitrification operation complicated operation, processing costs is expensive, and air stripping method denitrogenation easily causes topsoil, and traditional biological denitrification process is according to the realization mechanism of nitrification and denitrification in biological denitrificaion, using nitrification and denitrification, independently the stage carries out separately respectively in Aerobic Pond and anoxic pond as two, and total hrt is long, condition controls complicated, invests high.Rear research finds, synchronous nitration and denitrification (SND) technique, can in the body of same pond, there is nitrification-denitrification process under same operation condition simultaneously, the shortcoming such as long reaction time, the floor space that can make up traditional biological denitrification process are large, energy consumption is high.
Think and the ammonia nitrogen waste water problem that solution two alcohol and coal gasification apparatus produce can adopt this sewage of synchronous nitration and denitrification process unit individual curing.The external application report to synchronous nitration and denitrification is more at present, and within 1985, Rittmaun and Langelaud successfully achieves Simultaneous Nitrification and denitrification at plant-scale oxidation ditch; Klangduen etc. apply SBR and realize system synchronization nitration denitrification, reach 95% to nitrogen removal rate; Puznava etc. realize SND biological denitrificaion in bio-aeration pool; The external research to SND is at present in the practice stage moving towards Sewage Plant gradually from laboratory.Domestic scholars has also carried out large quantifier elimination to SND technology, and research emphasis mainly Nitrogen Removal Mechanism, influence factor and different process realizes the condition of SND.Some scientific research personnel adopt sequencing batch active sludge process height nitrogen soybean wastewater; achieve nitrosification denitrification and synchronous nitration and denitrification in reactor simultaneously; but owing to also there is arguement to the concrete mechanism of action of synchronous nitration and denitrification and controling parameters; thus limit its industrial scale produce in application; so current domestic majority research is also in laboratory stage, do not put into production.Denitrogenation course is shortened because synchronous nitration and denitrification has, save the reaction times, reduce the advantage such as power consumption and processing costs, become the study hotspot of technical field of sewage biological denitrification, synchronous nitration and denitrification process unit gas treatment ammonia-nitrogen sewage has important production practical significance to sewage disposal.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, a kind of ammonia nitrogen can effectively removed in sewage is provided, and can by between nitration denitrification reaction at the same time, isospace carries out, effective Reaction time shorten, improve nitration denitrification speed, reduce full scale plant and the treatment process of the synchronous nitration and denitrification gas treatment ammonia-nitrogen sewage of technique structures and capital cost.
The technical solution adopted for the present invention to solve the technical problems is: the full scale plant of this synchronous nitration and denitrification gas treatment ammonia-nitrogen sewage, comprise a rectangular aeration tank and the waste pipe passing into aeration tank, it is characterized in that: distribute in aeration tank many aeration tubes, the Yi Jiaochu of aeration tank builds a settling tank by laying bricks or stones, in settling tank, mud scraper is installed, settling tank pool wall has water port and refluxing opening, wall has aeration tank water outlet above settling tank, a partition wall built by dividing wall perpendicular to aeration tank and settling tank, reaction zone, aeration tank is divided into the left and right sides, waste pipe exports, the refluxing opening of settling tank and water port are in partition wall the same side, aeration tank water outlet is at partition wall opposite side, sewage can flow along partition wall direction and enter in settling tank by aeration tank water outlet.Sewage can be drained into the mixing zone in aeration tank and fully mix with backflow nitrification liquid by waste pipe, the aeration tube in simultaneous reactions district realizes air aeration, under the effect of air aeration and nitrification liquid, sludge reflux, the nitration and opposite nitration of microorganism is utilized fully to degrade, muddy water mixed solution after process enters settling tank from flowing through aeration tank water outlet, under the effect of mud scraper, supernatant liquor after settle discharges from water port, major part mud is back to the mixing zone of aeration tank by refluxing opening, small part excess sludge is arranged outward.
Described aeration tube totally two, is parallel to each other and is distributed in the both sides of partition wall, and two aeration tubes are connected by 3 transverse tubes on cement cover board top, aeration tank, and left side aeration tube extends the mixing zone passing to aeration tank.Aeration tube is connected with the tracheae outside aeration tank.
Described partition wall one end and settling tank are fixed together, and have sludge reflux hole below this end of partition wall, the partition wall the other end and aeration tank leave passage between the walls.Sewage is along partition wall side from inflow reaction zone, mixing zone, by oppositely flowing automatically along partition wall opposite side after front channel, exit nitrification liquid and most of mud enter the mixing zone of aeration tank through the backflow of sludge reflux hole, and part muddy water mixed solution enters settling tank from flowing through aeration tank water outlet.
Described refluxing opening is connected with the first air stripper by pipeline.First air stripper can make most of mud in settling tank be back to the mixing zone of aeration tank by refluxing opening.
Described sludge reflux hole is connected with the second air stripper by pipeline, and the outlet of the second air stripper and the first air stripper and waste pipe water outlet are at homonymy.Second air stripper can make exit, aeration tank major part mud enter the mixing zone of aeration tank through the backflow of sludge reflux hole.
Described water port is connected by the new accident pool in pipeline and outside.
In described waste pipe, magnetic flow meter is installed.
Cement cover board is stamped above described aeration tank.
A treatment process for synchronous nitration and denitrification gas treatment ammonia-nitrogen sewage, is characterized in that, comprise the following steps:
1, the full scale plant of synchronous nitration and denitrification gas treatment ammonia-nitrogen sewage is set, and make gasification ammonia-nitrogen sewage drain into the mixing zone in aeration tank by waste pipe and be mixed to form muddy water mixed solution with returned sluge, muddy water mixed solution flows automatically along partition wall side from mixing zone and enters reaction zone, in gravity flow process, muddy water mixed solution carries out aeration through aeration tube, and make sludge concentration control at 4-8mg/L, DO controls at 0.2-1.5mg/L, mud age is 22d, at air aeration and nitrification liquid, under the effect of sludge reflux, the nitration and opposite nitration of microorganism is utilized fully to degrade, nitrite is made to obtain stable accumulation and directly be reduced into nitrogen, under low DO condition, the avidity of ammonia oxidation bacteria to dissolved oxygen is stronger than NOB, and nitrite can obtain stability product and tires out and be directly reduced into nitrogen.
2, the muddy water mixed solution after nitrification-denitrification reaction continues oppositely to flow automatically along partition wall opposite side, when flowing to aeration tank water outlet, major part mud enters the mixing zone of aeration tank by sludge reflux aperture second air stripper, part muddy water mixed solution enters settling tank from flowing through aeration tank water outlet;
3, enter the muddy water mixed solution of settling tank under the effect of mud scraper, the supernatant liquor after sedimentation discharges from water port, and most of mud is back to the mixing zone of aeration tank by refluxing opening, and small part excess sludge is arranged outward, with this cycle operation; In gas treatment ammonia-nitrogen sewage process, pH value is 8.0-8.5, and flooding velocity is 70m
3/ h, sludge concentration 4-8g/L, the COD of sewage after process
craverage is lower than 60mg/L, COD
craverage removal rate is 88.8%.
Compared with prior art, the beneficial effect that the present invention has is:
1, the ammonia nitrogen in sewage can effectively be removed: utilize aeration tube to realize air aeration, under the effect of air aeration and nitrification liquid, sludge reflux, the nitration and opposite nitration of microorganism is utilized fully to degrade, settling tank water outlet ammonia nitrogen is all the time below detection limit, and after process, sewage can qualified discharge.
2, nitrification-denitrification reaction same time, isospace in same aeration tank are carried out, reduce technique structures and capital cost, ammonium oxidation is controlled, at Nitrification Stage, effectively shorten the reaction times, improve nitrated, denitrification rate.
3, the COD of the rear sewage of process
craverage is lower than 60mg/L, COD
craverage removal rate is 88.8%, while removal ammonia nitrogen, removes total nitrogen effectiveness comparison obvious, as calculated, 96.2% is about to the clearance of total nitrogen, illustrates that in device, there occurs synchronous nitration and denitrification reacts, owing to carrying out while two kinds of reactions, water outlet pH remains stable, has saved reagent consumption.
Accompanying drawing explanation
Fig. 1 is plot plan of the present invention.
Fig. 2 is schematic flow sheet of the present invention.
Fig. 3 is Inlet and outlet water NH
3-N removal effect comparison diagram.
Fig. 4 is Inlet and outlet water COD
crremoval effect comparison diagram.
Fig. 5 is settling tank nitrate content changing trend diagram.
Fig. 6 is settling tank nitrite content changing trend diagram.
Wherein: 1, aeration tank 2, partition wall 3, aeration tube 4, settling tank 5, mud scraper 6, aeration tank water outlet 7, refluxing opening 8, water port 9, sludge reflux hole 10, first air stripper 11, second air stripper 12, waste pipe 13, magnetic flow meter.
Embodiment
Fig. 1 ~ 6 are most preferred embodiments of the present invention, and below in conjunction with accompanying drawing 1 ~ 6, the present invention will be further described:
With reference to accompanying drawing 1: the full scale plant of this synchronous nitration and denitrification gas treatment ammonia-nitrogen sewage, comprise a rectangular aeration tank 1 and the waste pipe 12 passing into aeration tank 1, cement cover board is stamped above aeration tank 1, sewage is introduced aeration tank 1 by acting as of waste pipe 12, is provided with magnetic flow meter 13 in waste pipe 12.Distribution many aeration tubes 3 in aeration tank 1, the region at aeration tube 3 place is reaction zone, and the Yi Jiaochu of aeration tank 1 builds a settling tank 4 by laying bricks or stones, installs mud scraper 5 in settling tank 4, settling tank 4 pool wall has refluxing opening 7 and water port 8, water port 8 is connected by the new accident pool in pipeline and outside.Above settling tank 4, wall has aeration tank water outlet 6, a partition wall 2 is built perpendicular to aeration tank 1 and the dividing wall of settling tank 4, reaction zone, aeration tank 1 is divided into the left and right sides, make that waste pipe 12 exports, the refluxing opening of settling tank 47 and water port 8 be in partition wall 2 the same side, the i.e. mixing zone of aeration tank 1, aeration tank water outlet 6 is at partition wall 2 opposite side, and sewage can flow along partition wall 2 direction and enter in settling tank 4 by aeration tank water outlet 6.
Partition wall 2 one end and settling tank 4 are fixed together, sludge reflux hole 9 is had below this end of partition wall 2, partition wall 2 the other end and aeration tank 1 leave passage between the walls, form sewage self-flowing passage, aeration tube 3 totally two, is parallel to each other and is distributed in the both sides of partition wall 2, and two aeration tubes 3 are connected by 3 transverse tubes on cement cover board top, aeration tank 1, left side aeration tube 3 extends the mixing zone passing to aeration tank 1, and aeration tube 3 is connected with the tracheae outside aeration tank 1.
Refluxing opening 7 is connected with the first air stripper 10, first air stripper 10 by pipeline can make most of mud in settling tank 4 be back to the mixing zone of aeration tank 1 by refluxing opening 7.Sludge reflux hole 9 is connected with the second air stripper 11 by pipeline, the outlet of the second air stripper 11 and the first air stripper 10 and waste pipe 12 water outlet are at homonymy, and the second air stripper 11 can make exit, aeration tank 1 major part mud enter the mixing zone of aeration tank 1 through sludge reflux hole 9 backflow.
Water inlet and each unit design index design according to following table 1.
Table 1 is intake and each unit design index
With reference to accompanying drawing 2, a kind for the treatment of process of synchronous nitration and denitrification gas treatment ammonia-nitrogen sewage, comprises the following steps:
1, the full scale plant of synchronous nitration and denitrification gas treatment ammonia-nitrogen sewage is set, and make gasification ammonia-nitrogen sewage drain into the mixing zone in aeration tank 1 by waste pipe 12 and be mixed to form muddy water mixed solution with returned sluge, muddy water mixed solution flows automatically along partition wall 2 side from mixing zone and enters reaction zone, in gravity flow process, muddy water mixed solution carries out aeration through aeration tube 3, and make sludge concentration control at 4-8mg/L, DO controls at 0.2-1.5mg/L, mud age is 22d, at air aeration and nitrification liquid, under the effect of sludge reflux, the nitration and opposite nitration of microorganism is utilized fully to degrade, nitrite is made to obtain stable accumulation and directly be reduced into nitrogen, under low DO condition, the avidity of ammonia oxidation bacteria to dissolved oxygen is stronger than NOB, and nitrite can obtain stability product and tires out and be directly reduced into nitrogen.
2, the muddy water mixed solution after nitrification-denitrification reaction continues oppositely to flow automatically along partition wall 2 opposite side, when flowing to aeration tank water outlet 6, major part mud enters the mixing zone of aeration tank 1 through the second air stripper 11 by sludge reflux hole 9, part muddy water mixed solution enters settling tank 4 from flowing through aeration tank water outlet 6.
3, enter the muddy water mixed solution of settling tank 4 under the effect of mud scraper 5, the supernatant liquor after sedimentation discharges from water port 8, and most of mud is back to the mixing zone of aeration tank 1 by refluxing opening 7, and small part excess sludge is arranged outward, with this cycle operation; In gas treatment ammonia-nitrogen sewage process, pH value is 8.0-8.5, and flooding velocity is 70m
3/ h, sludge concentration 4-8g/L, the COD of sewage after process
craverage is lower than 60mg/L, COD
craverage removal rate is 88.8%.
With reference to Fig. 3, during device steady running, water inlet NH
3-N is 40.6-179mg/L, average out to 94.7mg/L, water outlet NH
3-N is between 0.2-0.6mg/L, and average out to 0.21mg/L, average removal rate is 99.7%, shows that this full scale plant is to NH
3the removal effect of-N is quite obvious.
With reference to Fig. 4, during device steady running, influent COD
crat 303-1037mg/L, average out to 575mg/L, water outlet COD
crbetween 42.7-69.1mg/L, average out to 58.4mg/L.COD
craverage removal rate is 88.8%, shows that this full scale plant is at removal NH
3while-N, to COD
cralso good removal effect is had.
With reference to Fig. 5 ~ 6, during device steady running, in settling tank 4 water outlet, nitrate, nitrite content are on average respectively 4.43mg/L and 0.02mg/L, and this illustrates through this full scale plant process, while removal ammonia nitrogen, remove total nitrogen effectiveness comparison obvious, as calculated, 96.2% is about to the clearance of total nitrogen, nitrogen removal rate height is illustrated in device, there occurs synchronous nitration and denitrification reaction, owing to carrying out while two kinds of reactions, water outlet pH remains stable, has saved reagent consumption.
The above is only preferred embodiment of the present invention, and be not restriction the present invention being made to other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the Equivalent embodiments of equivalent variations.But everyly do not depart from technical solution of the present invention content, any simple modification, equivalent variations and the remodeling done above embodiment according to technical spirit of the present invention, still belong to the protection domain of technical solution of the present invention.
Claims (7)
1. a treatment process for synchronous nitration and denitrification gas treatment ammonia-nitrogen sewage, is characterized in that, comprises the following steps:
1.1, the full scale plant of synchronous nitration and denitrification gas treatment ammonia-nitrogen sewage is set, described full scale plant comprises a rectangular aeration tank (1) and passes into the waste pipe (12) of aeration tank (1), distribution many aeration tubes (3) in aeration tank (1), the Yi Jiaochu of aeration tank (1) builds a settling tank (4) by laying bricks or stones, in settling tank (4), mud scraper (5) is installed, settling tank (4) pool wall has water port (8) and refluxing opening (7), settling tank (4) top wall has aeration tank water outlet (6), a partition wall (2) is built perpendicular to aeration tank (1) and the dividing wall of settling tank (4), aeration tank (1) reaction zone is divided into the left and right sides, waste pipe (12) exports, the refluxing opening (7) of settling tank (4) and water port (8) are in partition wall (2) the same side, aeration tank water outlet (6) is at partition wall (2) opposite side, sewage can flow along partition wall (2) direction and enter in settling tank (4) by aeration tank water outlet (6),
Gasification ammonia-nitrogen sewage is drained into the mixing zone in aeration tank (1) by waste pipe (12) and is mixed to form muddy water mixed solution with returned sluge, muddy water mixed solution flows automatically along partition wall (2) side from mixing zone and enters reaction zone, in gravity flow process, muddy water mixed solution carries out aeration through aeration tube (3), and make sludge concentration control at 4-8mg/L, DO controls at 0.2-1.5mg/L, mud age is 22d, at air aeration and nitrification liquid, under the effect of sludge reflux, the nitration and opposite nitration of microorganism is utilized fully to degrade, nitrite is made to obtain stable accumulation and directly be reduced into nitrogen,
1.2, the muddy water mixed solution after nitrification-denitrification reaction continues oppositely to flow automatically along partition wall (2) opposite side, when flowing to aeration tank water outlet (6), major part mud enters the mixing zone of aeration tank (1) through the second air stripper (11) by sludge reflux hole (9), part muddy water mixed solution enters settling tank (4) from flowing through aeration tank water outlet (6);
1.3, the muddy water mixed solution of settling tank (4) is entered under the effect of mud scraper (5), supernatant liquor after sedimentation discharges from water port (8), major part mud is back to the mixing zone of aeration tank (1) by refluxing opening (7), small part excess sludge is arranged outward, with this cycle operation; In gas treatment ammonia-nitrogen sewage process, pH value is 8.0-8.5, and flooding velocity is 70m
3/ h, sludge concentration 4-8g/L, the COD of sewage after process
craverage is lower than 60mg/L, COD
craverage removal rate is 88.8%.
2. the treatment process of a kind of synchronous nitration and denitrification gas treatment ammonia-nitrogen sewage according to claim 1, it is characterized in that: described aeration tube (3) totally two, be parallel to each other and be distributed in the both sides of partition wall (2), article two, aeration tube (3) is connected by 3 transverse tubes on aeration tank (1) cement cover board top, and left side aeration tube (3) extends the mixing zone passing to aeration tank (1).
3. the treatment process of a kind of synchronous nitration and denitrification gas treatment ammonia-nitrogen sewage according to any one of claim 1 or 2, it is characterized in that: described partition wall (2) one end and settling tank (4) are fixed together, have sludge reflux hole (9) below partition wall (2) this end, partition wall (2) the other end and aeration tank (1) leave passage between the walls.
4. the treatment process of a kind of synchronous nitration and denitrification gas treatment ammonia-nitrogen sewage according to claim 1, is characterized in that: described refluxing opening (7) is connected with the first air stripper (10) by pipeline.
5. the treatment process of a kind of synchronous nitration and denitrification gas treatment ammonia-nitrogen sewage according to claim 3, it is characterized in that: described sludge reflux hole (9) is connected with the second air stripper (11) by pipeline, the outlet of the second air stripper (11) and the first air stripper (10) and waste pipe (12) water outlet are at homonymy.
6. the treatment process of a kind of synchronous nitration and denitrification gas treatment ammonia-nitrogen sewage according to claim 1, is characterized in that: described water port (8) is connected by the new accident pool in pipeline and outside.
7. the treatment process of a kind of synchronous nitration and denitrification gas treatment ammonia-nitrogen sewage according to claim 1, is characterized in that: be provided with magnetic flow meter (13) in described waste pipe (12).
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| KR20010007939A (en) * | 2000-10-26 | 2001-02-05 | 박호군 | Advanced Treatment Process of Domestic Wastewater by Biological and Chemical |
| CN201338965Y (en) * | 2008-06-13 | 2009-11-04 | 必德普(北京)环保科技有限公司 | Biological sewage treatment device |
| CN102173510A (en) * | 2011-03-03 | 2011-09-07 | 浙江工商大学 | Sludge reflow-free device with simultaneous nitrification and denitrification (SND) function and operation control method thereof |
| CN202156955U (en) * | 2011-07-01 | 2012-03-07 | 北京中恒意美环境工程技术有限公司 | System for treating high concentration waste water |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010007939A (en) * | 2000-10-26 | 2001-02-05 | 박호군 | Advanced Treatment Process of Domestic Wastewater by Biological and Chemical |
| CN201338965Y (en) * | 2008-06-13 | 2009-11-04 | 必德普(北京)环保科技有限公司 | Biological sewage treatment device |
| CN102173510A (en) * | 2011-03-03 | 2011-09-07 | 浙江工商大学 | Sludge reflow-free device with simultaneous nitrification and denitrification (SND) function and operation control method thereof |
| CN202156955U (en) * | 2011-07-01 | 2012-03-07 | 北京中恒意美环境工程技术有限公司 | System for treating high concentration waste water |
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