CN102897973A - Method and device for deep denitrification of garbage leachate - Google Patents
Method and device for deep denitrification of garbage leachate Download PDFInfo
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Abstract
The invention discloses a device and a method for deep denitrification of a garbage leachate, relating to the field of saprobia. The device disclosed herein comprises a water inlet tank, two middle water tanks and three SBR reactors, wherein a stirrer is arranged in the SBR reactor, aeration units are arranged in the first and the second SBR reactors, the water inlet tank is communicated with the first SBR reactor, and the middle water tanks are communicated with the adjacent two SBR reactors. The method for using the device comprises the following steps: carrying out denitrification reaction on a mixed solution of raw water and an ASBR reactor effluent in the first SBR reactor, then removing organic matters, letting 40-45% of the effluent enter into the second middle water tank, letting the rest effluent directly enter into the second SBR reactor to conduct partial nitrification, mixing the effluents of the first and the second SBR reactors, then letting the mixed effluents enter into the ASBR reactor to conduct anaerobic ammoxidation reaction, dewatering, then letting 65-70% of the effluent return to the water inlet tank, and discharging the rest effluent. According to the invention, the purpose of deep denitrification of the garbage leachate is realized without adding any organic carbon source.
Description
Technical field
The present invention relates to the biological sewage treatment field, especially a kind of method and device that percolate is carried out the advanced nitrogen processing.
Background technology
Along with the raising of China's expanding economy and people's living standard, China's municipal wastes output constantly increases, and China's overwhelming majority rubbish adopts landfill disposal, and the percolate that meanwhile produces has had a strong impact on the water surrounding of China.Percolate contains a large amount of organism and ammonia nitrogen, belongs to high ammonia nitrogen used water difficult to degradate, how to process effectively economically percolate, is the Focal point and difficult point of China water treatment aspect always.
The Anammox phenomenon has received much concern since nineteen ninety-five is reported.Because in anaerobic ammonium oxidation process, anaerobic ammonia oxidizing bacteria can be converted into nitrogen with ammonia nitrogen and nitrite nitrogen, and does not need the participation of oxygen, whole process belongs to the autotrophy process fully.Therefore compare with conventional nitrification and denitrification, anaerobic ammonia oxidation process can be saved 50% oxygen supply expense, and need not additional carbon, has greatly reduced processing costs and the capital cost of sewage disposal.Yet contain a large amount of organism in the percolate, can produce adverse influence to the Anammox reaction.Disadvantageous effect mainly contains two aspects, one side is that the organism in the percolate mostly is hardly degraded organic substance, some has toxicity, can produce toxic action to anaerobic ammonia oxidizing bacteria, organism in the percolate is conducive to the growth of heterotrophic denitrifying Bacteria on the other hand, with anaerobic ammonia oxidizing bacteria competition nitrite nitrogen matrix, reaction produces restraining effect to Anammox.Therefore, how to reduce the impact of Organic Pollutants of Landfill Leachate, determined it is that can the Anammox reaction be applied to the percolate advanced nitrogen.In addition, because the Anammox reaction can produce a certain amount of nitric nitrogen, therefore system's water outlet still also has nitric nitrogen, also can affect the nitric efficiency of system.
Summary of the invention
For the weak point of above-mentioned technology, the invention provides a kind of method and device, percolate be can solve and difficult, the difficult problem of advanced nitrogen processed, especially solved the impact of Organic Pollutants of Landfill Leachate on Anammox.
For achieving the above object, the invention provides a kind of device that percolate is carried out the advanced nitrogen processing.This device comprises three sbr reactor devices (sequencing batch reactor), water tank inlet and two intermediate water tanks, and the inside of described sbr reactor device all is provided with whipping appts, and the first sbr reactor device and the second sbr reactor device inside are provided with aerating apparatus.
A kind of device that percolate is carried out the advanced nitrogen processing, it is characterized in that: this device comprises three sbr reactor devices, water tank inlet and two intermediate water tanks, three sbr reactor devices are respectively the first sbr reactor device, the second sbr reactor device and ASBR reactor, and two intermediate water tanks are respectively the first intermediate water tank and the second intermediate water tank;
The inside of described sbr reactor device all is provided with whipping appts and pH meter, and the first sbr reactor device and the second sbr reactor device inside are provided with aerating apparatus; The second sbr reactor device inside also is provided with the DO instrument;
Water tank inlet is connected with the first sbr reactor device, and the first sbr reactor device is connected with the first intermediate water tank; The first intermediate water tank also is connected with the second sbr reactor device with the second intermediate water tank respectively, and the second intermediate water tank also is connected with the ASBR reactor with the second sbr reactor device respectively, and the water outlet of ASBR reactor is connected with water tank inlet by return line.
Use described a kind of method of percolate being carried out the device of advanced nitrogen processing, it is characterized in that:
Former water enters water tank inlet, mixes in water tank inlet with the water outlet of ASBR reactor, injects the first sbr reactor device by water inlet pipe and carries out anti-nitration reaction, includes whipping appts, aerating apparatus and pH meter in the first sbr reactor device; The anti-nitration reaction of the first sbr reactor device carries out organic matter removal after finishing, and behind organic matter removal, water outlet all enters the first intermediate water tank; Judge the denitrification terminal point by the variation of pH during this time, occur opening aerating apparatus after the decline flex point until pH, aerobic heterotrophic bacterium in the reactor is degraded to the organic carbon source in the former water under the aeration state, judge the terminal point that reaction finishes by the variation of pH during this time, treat that pH stops aerating apparatus and whipping appts when the decline flex point occurring, the first sbr reactor device then enters next cycle after the draining;
The water outlet of 40% ~ 45% in the first intermediate water tank enters the second intermediate water tank by rising pipe, and 55% ~ 60% water outlet is injected the second sbr reactor device by water inlet pipe and carried out the short distance nitration reaction; The second sbr reactor device includes whipping appts, aerating apparatus and pH meter, DO instrument; Water outlet after the short distance nitration reaction of the second sbr reactor device finishes directly enters the second intermediate water tank by rising pipe; Judge during this time the terminal point of short distance nitration by the variation of pH and DO, when treating that DO and pH all occur rising, stop aerating apparatus and whipping appts, the second sbr reactor device then enters next cycle after the draining;
Inject the ASBR reactor by water inlet pipe after the water outlet of the water outlet of the first sbr reactor device and the second sbr reactor device mixes and carry out the Anammox reaction in the second intermediate water tank; Judge reaction end by the variation of pH during this time, when treating that the decline flex point appears in pH, stop whipping appts; The ASBR reactor includes whipping appts and pH meter; Reacted water outlet 65% ~ 70% is back to water tank inlet by return line, and remaining water outlet is directly discharged by rising pipe, and the ASBR reactor then enters next cycle.
Compared with prior art, the present invention has the following advantages:
Treatment unit provided by the invention adopts three grades of SBR systems, under the condition of not adding any organic carbon source, reaches the purpose of percolate being carried out advanced nitrogen.
Treatment process provided by the invention is used the Anammox technology percolate is carried out the advanced nitrogen processing, compare with conventional nitrification and denitrification, save 50% oxygen supply expense, and need not additional carbon, greatly reduced processing costs and the capital cost of sewage disposal.Since when nitrite nitrogen concentration during greater than 100mg/L the activity of anaerobic ammonia oxidizing bacteria can be suppressed, therefore the ASBR reactor adopts continuous water intake mode, avoid the high density nitrite nitrogen to the inhibition of Anammox reaction, reduced simultaneously the variation of pH that disposable water inlet brings and temperature to the disadvantageous effect of reaction.The water inlet of Anammox derives from respectively the water outlet of the first sbr reactor device and the second sbr reactor device, by the organism in the aerobic aeration removal percolate, suppressed the growth of denitrifying bacteria in the ASBR reactor, avoid denitrifying bacteria and anaerobic ammonia oxidizing bacteria competing reaction matrix, thereby more be conducive to the carrying out of Anammox reaction.Simultaneously, the ASBR effluent recycling so that the nitric nitrogen that produces can be removed by denitrification process, has improved the denitrification percent of system.System's influent ammonium concentration is 2000 ± 100mg/L, and water outlet ammonia nitrogen and nitrite nitrogen all are lower than 5mg/L, and total nitrogen is 80mg/L approximately, and system's denitrification percent reaches more than 95% under the condition of additional carbon not.
Description of drawings
Fig. 1 is the structure iron of apparatus of the present invention part;
Fig. 2 is the schema of the inventive method part.
Main nomenclature is as follows:
1-raw water box 2-intake pump 3-water inlet pipe
4-gas blower 5-gas meter 6-the first sbr reactor device
7-agitator 8-water discharge valve 9-rising pipe
10-the first intermediate water tank 11-DO instrument 12-pH meter
13-the second intermediate water tank 14-aeration head 15-the second sbr reactor device
16-collection and confinement of gases tank 17-ASBR reactor 18-isocon
The 19-return line
Embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail.
It is characterized in that: this device comprises three sbr reactor devices, water tank inlet and two intermediate water tanks, three sbr reactor devices are respectively the first sbr reactor device, the second sbr reactor device and ASBR reactor, and two intermediate water tanks are distinguished the first intermediate water tank and the second intermediate water tank;
The inside of described sbr reactor device all is provided with whipping appts 7, the first sbr reactor devices and the second sbr reactor device inside is provided with aerating apparatus.
The invention provides a kind of device that percolate is carried out the advanced nitrogen processing.This device comprises three sbr reactor devices, water tank inlet and two intermediate water tanks, and the inside of described sbr reactor device all is provided with whipping appts, and the first sbr reactor device and the second sbr reactor device inside are provided with aerating apparatus.
As shown in Figure 1, the invention provides a kind of device that percolate is carried out the advanced nitrogen processing, comprise three sbr reactor devices, water tank inlet and two intermediate water tanks, three sbr reactor devices are divided into the first sbr reactor device 6, the second sbr reactor device 15 and ASBR reactor 17, two intermediate water tanks are divided into the first intermediate water tank 10 and the second intermediate water tank 13, the first intermediate water tanks 10 are connected with the second intermediate water tank 13 by a minute overflow pipe 18.Inside at the first sbr reactor device 6, the second sbr reactor device 15 and Three S's BR reactor 17 is equipped with whipping appts.Water tank inlet 1 is connected with the first sbr reactor device 6, the two ends of the first intermediate water tank 10 are connected with the second sbr reactor device 15, the second intermediate water tank 13 with the first sbr reactor device 6 respectively, the two ends of the second intermediate water tank are connected with ASBR reactor 17 with the first intermediate water tank 10, the second sbr reactor device 15 respectively, and the water outlet of ASBR reactor is connected with water tank inlet 1 by return line 19.
The first intermediate water tank 10 is connected with the second sbr reactor device 15, and the water inlet pipe 3 between the first intermediate water tank 10 and the second sbr reactor device 15 is provided with intake pump 2.Be provided with agitator 7 in the inside of the second sbr reactor device 15, be provided with simultaneously DO instrument 11 and pH meter 12.Aerating apparatus is arranged on the bottom of the second sbr reactor device 15, aeration mechanism is made of aeration tube, gas blower 4, gas meter 5 and aeration head 14, the two ends of aeration tube are connected with gas blower 4 and gas meter 5 respectively, and gas meter 5 and aeration head 14 are connected by aeration tube.The second sbr reactor device 15 is connected with the second intermediate water tank 13 by rising pipe 3.
The second intermediate water tank 13 is connected with ASBR reactor 17, and the water inlet pipe 1 between the second intermediate water tank 13 and ASBR reactor 17 is provided with intake pump 3.The inside of ASBR reactor 17 is provided with agitator 7.The ASBR reactor head connects collection and confinement of gases tank 16 and gas meter 5.ASBR reactor 17 carries out draining by rising pipe 9, carries out effluent recycling by return line 19.
Open intake pump, the mixed solution of former water mature leachate and the water outlet of ASBR reactor is delivered to the first sbr reactor device from water tank inlet, open whipping appts, reactor carries out anoxic denitrification, during variation judgement denitrification terminal point by pH.When treating that the decline flex point appears in pH, show that denitrification finishes, open aerating apparatus, adjusting gas flow meter, reactor begin to remove the organism in the percolate, during same variation by pH judge reaction end.When the decline flex point appears in pH, show that organism removes, close whipping appts and aerating apparatus, its water outlet drains into the first intermediate water tank by rising pipe, and the first sbr reactor device then enters next cycle.40% ~ 45% water outlet is injected the second intermediate water tank by isocon in the first intermediate water tank, and 55% ~ 60% water outlet is delivered to the second sbr reactor device by water inlet pipe under the effect of intake pump, open whipping appts and aerating apparatus.Owing to contain a large amount of ammonia nitrogens in the water outlet of the first sbr reactor device, and organic content is less, therefore, can carry out very soon nitration reaction in the second sbr reactor device, during judge reaction end by the variation of pH and DO.When pH and DO began to occur rising, nitration reaction finished.Because the associating restraining effect of high FNA after the high FA of water inlet and the reaction, the nitration reaction of carrying out in the reactor are the short distance nitration reaction.Stop whipping appts, its water outlet drains into the second intermediate water tank by rising pipe, and the second sbr reactor device then enters next cycle.The first sbr reactor device water outlet and the second sbr reactor device water outlet are after the second intermediate water tank mixes, and mixed solution is delivered to the ASBR reactor by water inlet pipe under the effect of intake pump, open whipping appts, and the ASBR reactor carries out the Anammox reaction.The during this time variation by pH and whether aerogenesis is judged reaction end, when aerogenesis not of decline flex point and observing response device appears in pH, show that reaction finishes, close whipping appts, 65% ~ 70% effluent recycling is to water tank inlet, the residue water outlet is discharged by rising pipe, and the ASBR reactor then enters next cycle.
Whole reactive system mainly relies on the Anammox reaction of ASBR reactor to carry out denitrogenation in the process of operation, and the ammonia nitrogen of its water inlet and nitrite nitrogen derive from respectively the water outlet of the first sbr reactor device and the second sbr reactor device.Because the Anammox reaction is complete autotrophy reaction, the organism in the percolate can have a negative impact to it, therefore by the organism in the removal of aeration in the first sbr reactor device percolate, reduce organism to the impact of Anammox.In addition, the water outlet 65% ~ 70% of ASBR reactor directly is back to water tank inlet, not only can regulate influent ammonium concentration, can utilize the carbon source of former water by denitrification the nitric nitrogen in the ASBR water outlet to be removed in the first sbr reactor device simultaneously.Therefore, whole system is under the condition of not adding any organic carbon source, and the nitrogen in the reactor more than 90% can remove from reactor with the form of nitrogen, realizes advanced nitrogen truly.
As shown in Figure 2, the present invention also provides a kind for the treatment of process of percolate being carried out advanced nitrogen simultaneously, may further comprise the steps:
(1) former water and ASBR water outlet are after water tank inlet mixes, and mixed solution carries out first denitrification in the first sbr reactor device, carry out subsequently organic matter removal;
The first intermediate water tank is injected in the water outlet of (2) first sbr reactor devices, and the second sbr reactor device is directly injected in 55% ~ 60% water outlet of the first intermediate water tank, and the second intermediate water tank is injected in 40% ~ 45% water outlet;
The first sbr reactor device water outlet in (3) first intermediate water tanks is carried out nitration reaction in the second sbr reactor device;
The second intermediate water tank is directly injected in the water outlet of (4) second sbr reactor devices, mixes with the water outlet of the first sbr reactor device;
The mixed solution of (5) second intermediate water tanks injects the ASBR reactor and carries out the Anammox reaction;
(6) water outlet 65% ~ 70% of ASBR reactor is back to water tank inlet, and the residue water outlet is directly discharged.
The first sbr reactor device carries out first anoxia stirring after water inlet, aeration only carries out organic matter removal more subsequently.Owing to containing a small amount of COD and a large amount of ammonia nitrogens in the mature leachate, and these a small amount of organism can produce to follow-up Anammox reaction adverse influence, therefore, remove these organism most important for the denitrification effect of keeping Systems balanth and system.In addition, because the Anammox reaction can produce nitric nitrogen, still contain a certain amount of nitric nitrogen in the water outlet of ASBR reactor.The ASBR water part is back to water tank inlet, and by the anoxia stirring in the first sbr reactor device, not only denitrification has been removed the nitric nitrogen of ASBR reactor water outlet, has utilized more fully the organic carbon source in the former water simultaneously, has avoided the waste of carbon source.Owing in the first sbr reactor device, only carrying out organic matter removal, treat that pH the decline flex point occurs and stops immediately aeration, therefore nitration reaction does not occur, still also has a large amount of ammonia nitrogens in the first sbr reactor device water outlet, but COD obviously reduces, and remaining only is hardly degraded organic substance, and therefore the water outlet of the first sbr reactor device can provide ammonia nitrogen matrix for follow-up ASBR reactor, simultaneously effectively remove COD, reduced the impact of organism on the Anammox reaction.
The water inlet of the second sbr reactor device derives from the water outlet of the first sbr reactor device, and its Main Function is that short distance nitration is carried out in the water outlet of the first sbr reactor device.Owing to only remaining the organism of difficult degradation in the water outlet of the first sbr reactor device, therefore the second sbr reactor device can directly carry out nitration reaction under aeration condition.Under the associating restraining effect of high FNA after the high FA of water inlet and the reaction, the second sbr reactor device has been realized short distance nitration, so that its water outlet contains a large amount of nitrite nitrogens and the nitric nitrogen of minute quantity, for follow-up ASBR reactor provides nitrite nitrogen matrix.
The water inlet of ASBR reactor is the mixed solution of the first sbr reactor device water outlet and the second sbr reactor device water outlet, and this mixed solution is mixed by the 40% ~ 45% and second sbr reactor device water outlet of the first sbr reactor device water outlet.Owing to having got rid of the impact of organism on Anammox in the last stage, therefore can in the ASBR reactor, keep preferably Anammox reaction, nitrogens most in the former water will remove from reactor with the form of nitrogen, realize completely denitrogenation truly.
Whole reactive system is in the first sbr reactor device, the second sbr reactor device and ASBR reactor, the nitrite nitrogen that utilizes original ammonia nitrogen in the percolate and reaction to produce, use the Anammox technology of autotrophic denitrification percolate is carried out the advanced nitrogen processing, the simultaneously water outlet 65% ~ 70% with the ASBR reactor refluxes, save energy not only, and need not additional carbon and just can deviate from most of total nitrogen, greatly reduced processing costs and the capital cost of sewage disposal.Influent ammonium concentration 2000 ± the 100mg/L of system, water outlet ammonia nitrogen and nitrite nitrogen all are lower than 5mg/L, and total nitrogen is 80mg/L approximately, and system's denitrification percent reaches more than 95% under the condition of not adding outer carbon source.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. one kind is carried out the device that advanced nitrogen is processed to percolate, it is characterized in that: this device comprises three sbr reactor devices, water tank inlet and two intermediate water tanks, three sbr reactor devices are respectively the first sbr reactor device, the second sbr reactor device and ASBR reactor, and two intermediate water tanks are respectively the first intermediate water tank and the second intermediate water tank;
The inside of described sbr reactor device all is provided with whipping appts and pH meter, and the first sbr reactor device and the second sbr reactor device inside are provided with aerating apparatus; The second sbr reactor device inside also is provided with the DO instrument;
Water tank inlet is connected with the first sbr reactor device, and the first sbr reactor device is connected with the first intermediate water tank; The first intermediate water tank also is connected with the second sbr reactor device with the second intermediate water tank respectively, and the second intermediate water tank also is connected with the ASBR reactor with the second sbr reactor device respectively, and the water outlet of ASBR reactor is connected with water tank inlet by return line.
2. application rights requires 1 described a kind of method of percolate being carried out the device of advanced nitrogen processing, it is characterized in that:
Former water enters water tank inlet, mixes in water tank inlet with the water outlet of ASBR reactor, injects the first sbr reactor device by water inlet pipe and carries out anti-nitration reaction, includes whipping appts, aerating apparatus and pH meter in the first sbr reactor device; The anti-nitration reaction of the first sbr reactor device carries out organic matter removal after finishing, and behind organic matter removal, water outlet enters the first intermediate water tank; Judge the denitrification terminal point by the variation of pH during this time, occur opening aerating apparatus after the decline flex point until pH, aerobic heterotrophic bacterium in the reactor is degraded to the organism in the former water under the aeration state, judge the terminal point that reaction finishes by the variation of pH during this time, treat that pH stops aerating apparatus and whipping appts when the decline flex point occurring, the first sbr reactor device then enters next cycle after the draining;
40% ~ 45% water outlet enters the second intermediate water tank by rising pipe in the first intermediate water tank, and 55% ~ 60% water outlet is injected the second sbr reactor device by water inlet pipe and carried out the short distance nitration reaction; The second sbr reactor device includes whipping appts, aerating apparatus and pH meter, DO instrument; Water outlet after the short distance nitration reaction of the second sbr reactor device finishes directly enters the second intermediate water tank by rising pipe; Judge during this time the terminal point of short distance nitration by the variation of pH and DO, when treating that DO and pH all occur rising, stop aerating apparatus and whipping appts, the second sbr reactor device then enters next cycle after the draining;
Inject the ASBR reactor by water inlet pipe after the water outlet of the water outlet of the first sbr reactor device and the second sbr reactor device mixes and carry out the Anammox reaction in the second intermediate water tank; Judge reaction end by the variation of pH during this time, when treating that the decline flex point appears in pH, stop whipping appts; The ASBR reactor includes whipping appts and pH meter; Reacted water outlet 65% ~ 70% is back to water tank inlet by return line, and remaining water outlet is directly discharged by rising pipe, and the ASBR reactor then enters next cycle.
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