CN103058374A - Method for treating high-content ammonia and nitrogen for shortcut nitrification to discharge effluent by coupling simultaneous denitrification of sludge fermentation with autotrophic nitrogen removal - Google Patents
Method for treating high-content ammonia and nitrogen for shortcut nitrification to discharge effluent by coupling simultaneous denitrification of sludge fermentation with autotrophic nitrogen removal Download PDFInfo
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Abstract
The invention discloses a method for treating high-content ammonia and nitrogen for shortcut nitrification to discharge effluent by coupling simultaneous denitrification of sludge fermentation with autotrophic nitrogen removal, belonging to the technical field of biochemical process sewage treatment. The high-efficiency removal of total nitrogen in wastewater and the reduction of sludge are realized in the same space by combined action of hydrolysis acidifying bacteria, denitrifying bacteria and anaerobic ammonium oxidation bacteria. The method is characterized in that part of NO2--N in effluent is reduced by short-chain fatty acid generated by hydrolytic acidification of residual sludge under the action of the denitrifying bacteria; and the other part of NO2--N and ammonia nitrogen released in the hydrolytic acidification process are removed by an anaerobic ammonia oxidation reaction, thereby greatly reducing the concentration of total nitrogen in the effluent and finishing the reduction of the residual sludge simultaneously. The technology is suitable for advanced treatment of high-content ammonia and nitrogen for shortcut nitrification to discharge the effluent.
Description
Technical field
The present invention relates to a kind of excess sludge acidication of using and produce the method that the intensified anti-nitrated and Anammox technology of carbon source is processed the water outlet of high ammonia-nitrogen wastewater short distance nitration, belong to the biochemical process technical field of sewage.By the acting in conjunction of acidication bacterium, denitrifying bacteria and anaerobic ammonia oxidizing bacteria, in the same space, realize the efficient removal of waste water total nitrogen and the decrement of mud.Part NO during the short chain fatty acid that specifically produces by the excess sludge acidication will be intake under the effect of denitrifying bacteria
2 --N reduction, in addition a part of NO
2 -The ammonia nitrogen that-N and Hydrolysis Acidification discharge is removed by the Anammox reaction, thereby the water outlet total nitrogen concentration is reduced greatly, has finished simultaneously the minimizing of excess sludge.Present technique is applicable to the advanced treatment of high ammonia-nitrogen wastewater short distance nitration water outlet.
Background technology
High ammonia-nitrogen wastewater generally includes Sludge Digestion in Wastewater Treatment Plant liquid, coking chemical waste water, percolate and fertilizer waste water etc.The ammonia nitrogen of this class waste water is tens times of city domestic sewage normally, and carbon-nitrogen ratio is very low, usually it is carried out individual curing.If adopt conventional nitrification and denitrification technique, need add a large amount of outer carbon sources, greatly improve the working cost of sewage work.
The short-cut nitrification and denitrification technology is controlled at the nitrous stage with nitrifying process, is carrying out denitrification, and it receives much concern because saving 25% aeration rate and 40% carbon source, but city domestic sewage is difficult to keep stable short distance nitration, so that its application is difficult to promote.High ammonia-nitrogen wastewater is in nitrifying process, because the existence of the free ammonia of high density, can be good at suppressing the activity of NOB, can keep stable short distance nitration, therefore this technique usually is used for processing high ammonia-nitrogen wastewater, so that organic adding greatly reduces, has saved certain expense.
In order further to save the expense of high ammonia-nitrogen wastewater treating processes, current, there is software engineering researchers invent to go out half short distance nitration-anaerobic ammoxidation technique, the ammonia nitrogen of half is oxidized to nitrite in being about to intake, again its water outlet is squeezed in the anaerobic ammonia oxidation reactor, so that water outlet TN reduces greatly, this process need not the adding of organic carbon source, has greatly reduced working cost.But the problem of a most critical of this technique is how to guarantee that nitrated water outlet nitrite nitrogen concentration and ammonia nitrogen concentration ratio are about 1.32, at present, also lack effectively control, usually cause the final outflow water total nitrogen concentration too high because of ammonia nitrogen and the imbalance of nitrite nitrogen concentration ratio.
At present, for solving the problem of nitrated water outlet denitrifying carbon source deficiency, there is report to utilize the excess sludge fermentation to produce carbon source and comes intensified anti-nitrated denitrogenation, although the excess sludge acidication can produce a large amount of carbon sources utilized, but it discharges a large amount of ammonia nitrogens simultaneously, during to the acidication of excess sludge, the maximum burst size that its experimental result draws ammonia nitrogen reaches 200mg/L to Gao Yongqing etc. in research pH value.Therefore utilize the intensified anti-nitrated denitrogenation of sludge hydrolysis, acidification, although the water outlet total nitrogen concentration reduces greatly, because ammonia nitrogen concentration is too high, finally still be difficult to reach emission standard.
Utilize excess sludge fermentation synchronous denitrification coupling autotrophic denitrification system fundamentally to solve the problems referred to above, it is easy in keeping the characteristics of stablizing short distance nitration according to high ammonia-nitrogen wastewater, utilize the excess sludge product carbon source of sewage work self discharging to come intensified anti-nitrated, and by the ammonia nitrogen removal of Anammox effect with part nitrite nitrogen in the system and the release of excess sludge Hydrolysis Acidification, the water outlet total nitrogen concentration is reduced greatly.
Summary of the invention
The object of the invention is to according to high ammonia-nitrogen wastewater easily as keep the characteristics of stablize short distance nitration, in single reaction vessel, utilize excess sludge in the carbon source of Hydrolysis Acidification generation with part NO
2 --N is reduced to N
2, while part NO
2 -The ammonia nitrogen that-N and excess sludge Hydrolysis Acidification discharge is removed by the Anammox reaction.When the water outlet total nitrogen concentration reduces greatly, sewage treatment plant residual mud has been carried out the minimizing processing.
The present invention is achieved through the following technical solutions:
A kind of excess sludge fermentation synchronous denitrification coupling autotrophic denitrification device, it is characterized in that: be provided with sludge fermentation synchronous denitrification coupling self-supported denitrification reactor 5, denitrifying bacteria and acidication bacterium grow in the reactor with the flco shape, anaerobic ammonia oxidizing bacteria is attached to the sponge filler carrier surface, by grid 14 it is immersed in below the liquid level.The former pond 1 of nitrification liquid, storage basin 2, blowoff basin 3 and spoil disposal pond 4; Former pond 1 by intake pump 19 link to each other with the water-in of main reactor 5, storage basin 2 links to each other with the mud inlet of main reactor 5 by advancing dredge pump 20, the water port of main reactor 5 links to each other with blowoff basin 3 by valve 17, and the mud discharging mouth of main reactor 5 links to each other with spoil disposal pond 4 by valve 18.Main reactor 5 adopts the cylindrical enclosure structure, its cylinder upper center is provided with water seal arrangement 21, whipping appts adopts the cantilevered agitator, be fixed in the top of water seal arrangement 21, reactor top top cover is provided with gas collection mouth 22, the gas that produces in the main reactor 5 enters air collector 10 by gas collection mouth 22 by surge flask 11, the main reactor top also is provided with temperature control unit, it is by heating rod 12, temp probe 13 and Controlling System 8 form, be used for providing suitable temperature of reaction, main reactor 5 cylinder both sides are equipped with PH determinator 6 and ORP determinator 7, are used for the process of Real-Time Monitoring reaction.
Utilize above-mentioned excess sludge fermentation synchronous denitrification coupling autotrophic denitrification device to carry out denitrogenation and sludge treatment, mainly may further comprise the steps:
1) system starts: get excess sludge and the anaerobic digestion institute blowdown mud of sewage work's discharging, press the volume ratio of 1:1 and mix, add in the reactor, keep the reaction zone sludge concentration at 6000-8000mgMLSS/L.Nitrification liquid in the pump sump is squeezed in the main reactor, open whipping appts, the draining of reaction 12h postprecipitation, each cycle is added the excess sludge of 1/10 reactor useful volume, after finishing, draining discharges isopyknic mixing sludge, each cycle enters the high ammonia-nitrogen wastewater short distance nitration liquid of 1/2 reactor useful volume, NO in the nitrification liquid
2 --N=180-280mg/L, NO
3 --N=0-30mg/L, move continuously 15 cycles, acidication bacterium and denitrifying bacteria obtain certain enrichment in the system, the anaerobic ammonia oxidizing bacteria that is attached on the sponge filler is inoculated in the reactor, and on fixing with grid, make sponge filler be suspended in the reactor and be immersed in below the liquid level, the anaerobic ammonia oxidizing bacteria sludge concentration is controlled at 300-500mgMLSS/L, rerun 15 cycles, system's water outlet TN concentration is less than 30mg/L;
2) continuously operation: after system starts successfully, will enter the continuous operation phase, and comprise following process:
I adds mud: open dredge pump, excess sludge in the storage basin is squeezed in the main reactor, advancing the mud volume is 1/10 of reactor useful volume, after advancing mud and finishing, enters next process;
II water inlet: when intake pump is opened, open temperature control system and whipping appts, temperature setting is set to 30 degrees centigrade, the nitrification liquid with 1/4 reactor useful volume injects main reactor first, behind the reaction 6h, the nitrification liquid with 1/4 other reactor useful volume injects main reactor again;
III precipitation: when ORP determinator numerical value in the system less than-300mv or pH determinator in numerical value when no longer rising, close whipping appts, main reactor begins to enter precipitate phase, simultaneously, closes temperature control system, behind the precipitation 1h, enters next process;
The IV draining: open water discharge valve, system begins draining, and volume of displacement is 1/2 of reactor useful volume, and draining enters next process after finishing;
V spoil disposal: after draining finishes, open whipping appts and sludge pump, in system, behind the mixing, discharge the mixing sludge of reactor useful volume 1/10;
VI is idle: spoil disposal is closed whipping appts after finishing, and system begins to enter the idle stage.Behind the idle 1h, begin circulation from the operation I, enter next cycle.
Know-why
Excess sludge fermentation synchronous denitrification coupling autotrophic denitrification refers to the short chain fatty acid that produces by introducing high ammonia-nitrogen wastewater short distance nitration liquid, make part NO in the sludge hydrolysis, acidification process
2 --N removes by denitrification; In addition, the ammonia nitrogen that part nitrite nitrogen and excess sludge discharge at Hydrolysis Acidification is removed by the effect of anaerobic ammonia oxidizing bacteria, thereby the system total nitrogen concentration of making reduces greatly, simultaneously the excess sludge of sewage work's discharging has been carried out the minimizing processing.On the microbiology angle, acidication bacterium, denitrifying bacterium and anaerobic ammonium oxidizing bacteria can be good at coexisting as in the system, and at first, the COD of lower concentration can not suppress the effect of anaerobic ammonia oxidizing bacteria in the system, on the contrary, and have certain promoter action; Secondly, in the Hydrolysis Acidification of mud, the short chain fatty acid of its release and the process of ammonia nitrogen are slowly, the existence of nitrite nitrogen in system, produces some carbon sources, owing to can be consumed rapidly, and the ammonia nitrogen that discharges and the nitrite nitrogen in the system are by the effect of anaerobic ammonia oxidizing bacteria, also can slowly be removed, because the short chain fatty acid and the ammonia nitrogen that produce are consumed immediately, this has promoted again the process of acidication; In addition, denitrification process and anaerobic ammonium oxidation process can make system's pH value raise, and Hydrolysis Acidification can make pH value reduce, and three's acting in conjunction can make system held a metastable outside atmosphere.
Technical superiority of the present invention is mainly reflected in:
1) excess sludge that utilizes Sewage Plant self discharging has been saved the expense that produces because of additional carbon as denitrifying carbon source;
2) in system's operational process, mud has carried out minimizing, and the mud of simultaneity factor discharging is owing to the effect through nitrification liquid, and its dewatering improves a lot, and has alleviated subsequent disposal;
3) well solved the ammonia nitrogen that excess sludge discharges in Hydrolysis Acidification, system's water outlet total nitrogen can be up to state standards, and need not too many aftertreatment and just can discharge;
4) adopt sponge filler that anaerobic ammonia oxidizing bacteria is fixed, can not cause the loss of anaerobic ammonia oxidizing bacteria during spoil disposal, and its operating operation is convenient, control is simple;
Being difficult to when 5) well having solved by half short distance nitration/anaerobic ammonia oxidation process denitrogenation controlled the concentration ratio problem of ammonia nitrogen and nitrous and a large amount of release And Spread of Solutes of excess sludge fermentation coupling denitrification technique ammonia nitrogen.
Description of drawings
Fig. 1 is the structural representation of sludge fermentation synchronous denitrification coupling autotrophic denitrification device.
Among Fig. 1,1 is the nitrification liquid pump sump; 2 is storage basin; 3 is outlet sump; 4 is the spoil disposal pond; 5 are sludge fermentation synchronous denitrification coupling autotrophic denitrification main reactor; 6 is the PH determinator; 7 is the ORP determinator; 8 is temperature control system; 9 is whipping appts; 10 is air collector; 11 is surge flask; 12 is heating rod; 13 is temp probe; 14 is grid; 15 is sponge filler; 16 is thief hole; 17 is water discharge valve; 18 is mud valve; 19 is intake pump; 20 for advancing dredge pump; 21 is water seal arrangement; 22 is the gas collection mouth.
Embodiment
The present invention will be further described with example by reference to the accompanying drawings: as shown in Figure 1, sludge fermentation synchronous denitrification coupling autotrophic denitrification collection mud decrement device is provided with sludge fermentation synchronous denitrification coupling autotrophic denitrification main reactor 5, the former pond 1 of nitrification liquid, storage basin 2, blowoff basin 3 and spoil disposal pond 4; Former pond 1 by intake pump 19 link to each other with the water-in of main reactor 5, storage basin 2 links to each other with the mud inlet of main reactor 5 by advancing dredge pump 20, the water port of main reactor 5 links to each other with blowoff basin 3 by valve 17, and the mud discharging mouth of main reactor 5 links to each other with spoil disposal pond 4 by valve 18.
Concrete experimental water is the nitrification liquid of a high ammonia-nitrogen wastewater behind aeration, (pH=6.4-7.6, COD=40-65mg/L, NH
4 +-N=5-30mg/L, NO
2 --N=180-280mg/L, NO
3 --N=10-30mg/L), experiment mud that add every day is the fresh excess sludge (SS:15080-18010mg/L after a large-scale wastewater treatment plant concentrates; VSS=13250-16150 mg/L), used main reactor useful volume is 10L, each cycle water inlet 5L, and initial sludge concentration is at 6000-8000mg/L in the reactor, and temperature of reaction is controlled at 30 ℃.Detailed process is as follows:
1) system starts: get excess sludge and the anaerobic digestion institute blowdown mud of sewage work's discharging, press the volume ratio of 1:1 and mix, add in the reactor, keep the reaction zone sludge concentration at 6000-8000mgMLSS/L.Nitrification liquid in the pump sump is squeezed in the main reactor, open whipping appts, the draining of reaction 12h postprecipitation, each cycle is added the excess sludge of 1/10 reactor useful volume, after finishing, draining discharges isopyknic mixing sludge, each cycle enters the high ammonia-nitrogen wastewater short distance nitration liquid of 1/2 reactor useful volume, NO in the nitrification liquid
2 --N=180-280mg/L, NO
3 --N=0-30mg/L, move continuously 15 cycles, acidication bacterium and denitrifying bacteria obtain certain enrichment in the system, the anaerobic ammonia oxidizing bacteria that is attached on the sponge filler is inoculated in the reactor, and on fixing with grid, make sponge filler be suspended in the reactor and be immersed in below the liquid level, the anaerobic ammonia oxidizing bacteria sludge concentration is controlled at 300-500mgMLSS/L, rerun 15 cycles, system's water outlet TN concentration is less than 30mg/L;
2) continuously operation: after system starts successfully, will enter the continuous operation phase, and comprise following process:
I adds mud: open dredge pump, excess sludge in the storage basin is squeezed in the main reactor, advancing the mud volume is 1/10 of reactor useful volume, after advancing mud and finishing, enters next process;
II water inlet: when intake pump is opened, open temperature control system and whipping appts, temperature setting is set to 30 degrees centigrade, the nitrification liquid with 1/4 reactor useful volume injects main reactor first, behind the reaction 6h, the nitrification liquid with 1/4 other reactor useful volume injects main reactor again;
III precipitation: when ORP determinator numerical value in the system less than-300mv or pH determinator in numerical value when no longer rising, close whipping appts, main reactor begins to enter precipitate phase, simultaneously, closes temperature control system, behind the precipitation 1h, enters next process;
The IV draining: open water discharge valve, system begins draining, and volume of displacement is 1/2 of reactor useful volume, and draining enters next process after finishing;
V spoil disposal: after draining finishes, open whipping appts and sludge pump, in system, behind the mixing, discharge the mixing sludge of reactor useful volume 1/10;
VI is idle: spoil disposal is closed whipping appts after finishing, and system begins to enter the idle stage.Behind the idle 1h, begin circulation from the operation I, enter next cycle.
Utilize excess sludge fermentation synchronous denitrification coupling autotrophic denitrification collection mud decrement device to process the water outlet of high ammonia-nitrogen wastewater short distance nitration, it is 30 ℃ in temperature, sludge concentration MLSS remains on 6000-8000mg/L in the reactor, and each cycle adds the excess sludge of reactor useful volume 1/10, water inlet NH
4 +-N=5-30mg/L, NO
2 --N=180-280mg/L, NO
3 --N=10-30mg/L, final outflow water ammonia nitrogen concentration are less than 15mg/L, and water outlet TN concentration is less than 25mg/L, and each cycle, average VSS decrement reached 21%.System has successfully realized the coupling of acidication and denitrification and the Anammox of mud, the water outlet total nitrogen concentration is reduced greatly, and excess sludge has been carried out the minimizing processing.
Claims (1)
1. sludge fermentation synchronous denitrification coupling autotrophic denitrification is processed the method for high ammonia nitrogen short distance nitration water outlet, use such as lower device, this device comprises nitrification liquid pump sump (1), storage basin (2), outlet sump (3), spoil disposal pond (4), sludge fermentation synchronous denitrification Anammox main reactor (5), pH determinator (6), ORP determinator (7), temperature control unit (8), whipping appts (9), air collector (10), surge flask (11), heating rod (12), temp probe (13), grid (14), sponge filler (15), thief hole (16), water discharge valve (17), mud valve (18), intake pump (19), advance dredge pump (20), water seal arrangement (21), gas collection mouth (22);
Pump sump (1) by intake pump (19) link to each other with the water-in of main reactor (5), storage basin (2) links to each other with the mud inlet of main reactor (5) by advancing dredge pump (20), the water port of main reactor (5) links to each other with blowoff basin (3) by valve (17), and the mud discharging mouth of main reactor (5) links to each other with spoil disposal pond (4) by valve (18); Main reactor (5) also is provided with temperature control system, is comprised of heating rod (12), temp probe (13) and temperature control unit (8), and PH determinator (6) and ORP determinator (7) are installed, and is used for the process of Real-Time Monitoring reaction;
It is characterized in that, described method steps is as follows:
1) system starts: get excess sludge and the anaerobic digestion institute blowdown mud of sewage work's discharging, press the volume ratio of 1:1 and mix, add in the reactor, keep the reaction zone sludge concentration at 6000-8000mgMLSS/L; Nitrification liquid in the pump sump is squeezed in the main reactor, open whipping appts, the draining of reaction 12h postprecipitation, each cycle is added the excess sludge of 1/10 reactor useful volume, after finishing, draining discharges isopyknic mixing sludge, each cycle enters the high ammonia-nitrogen wastewater short distance nitration liquid of 1/2 reactor useful volume, NO in the nitrification liquid
2 --N=180-280mg/L, NO
3 --N=0-30mg/L, move continuously 15 cycles, acidication bacterium and denitrifying bacteria obtain certain enrichment in the system, the anaerobic ammonia oxidizing bacteria that is attached on the sponge filler is inoculated in the reactor, and on fixing with grid, make sponge filler be suspended in the reactor and be immersed in below the liquid level, the anaerobic ammonia oxidizing bacteria sludge concentration is controlled at 300-500mgMLSS/L, rerun 15 cycles, system's water outlet TN concentration is less than 30mg/L;
2) continuously operation: after system starts successfully, will enter the continuous operation phase, and comprise following process:
I adds mud: open dredge pump, excess sludge in the storage basin is squeezed in the main reactor, advancing the mud volume is 1/10 of reactor useful volume, after advancing mud and finishing, enters next process;
II water inlet: when intake pump is opened, open temperature control system and whipping appts, temperature setting is set to 30 degrees centigrade, the nitrification liquid with 1/4 reactor useful volume injects main reactor first, behind the reaction 6h, the nitrification liquid with 1/4 other reactor useful volume injects main reactor again;
III precipitation: when ORP determinator numerical value in the system less than-300mv or pH determinator in numerical value when no longer rising, close whipping appts, main reactor begins to enter precipitate phase, simultaneously, closes temperature control system, behind the precipitation 1h, enters next process;
The IV draining: open water discharge valve, system begins draining, and volume of displacement is 1/2 of reactor useful volume, and draining enters next process after finishing;
V spoil disposal: after draining finishes, open whipping appts and sludge pump, in system, behind the mixing, discharge the mixing sludge of reactor useful volume 1/10;
VI is idle: spoil disposal is closed whipping appts after finishing, and system begins to enter the idle stage; Behind the idle 1h, begin circulation from the operation I, enter next cycle.
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