CN104150729B - The sludge treating system of a kind of high efficient resourcing and low pollution emission and method - Google Patents
The sludge treating system of a kind of high efficient resourcing and low pollution emission and method Download PDFInfo
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- CN104150729B CN104150729B CN201410437275.1A CN201410437275A CN104150729B CN 104150729 B CN104150729 B CN 104150729B CN 201410437275 A CN201410437275 A CN 201410437275A CN 104150729 B CN104150729 B CN 104150729B
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- 238000000034 method Methods 0.000 title claims abstract description 96
- 239000010802 sludge Substances 0.000 title claims abstract description 74
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 71
- 230000008569 process Effects 0.000 claims abstract description 58
- 238000000855 fermentation Methods 0.000 claims abstract description 54
- 238000009283 thermal hydrolysis Methods 0.000 claims abstract description 36
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims abstract description 31
- 238000001816 cooling Methods 0.000 claims abstract description 27
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 77
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 34
- 230000017525 heat dissipation Effects 0.000 claims description 29
- -1 nitrite anions Chemical class 0.000 claims description 17
- 229910052757 nitrogen Inorganic materials 0.000 claims description 17
- 230000008676 import Effects 0.000 claims description 16
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 14
- 230000003647 oxidation Effects 0.000 claims description 13
- 238000007254 oxidation reaction Methods 0.000 claims description 13
- 239000010865 sewage Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000007062 hydrolysis Effects 0.000 claims description 2
- 238000006460 hydrolysis reaction Methods 0.000 claims description 2
- 230000009615 deamination Effects 0.000 abstract description 51
- 238000006481 deamination reaction Methods 0.000 abstract description 51
- 230000008901 benefit Effects 0.000 abstract description 8
- 239000000706 filtrate Substances 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000003344 environmental pollutant Substances 0.000 abstract description 3
- 231100000719 pollutant Toxicity 0.000 abstract description 3
- 230000000452 restraining effect Effects 0.000 abstract description 2
- 239000000126 substance Substances 0.000 description 12
- 230000009466 transformation Effects 0.000 description 10
- 239000000203 mixture Substances 0.000 description 6
- 231100000331 toxic Toxicity 0.000 description 6
- 230000002588 toxic effect Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000004151 fermentation Effects 0.000 description 5
- 230000001590 oxidative effect Effects 0.000 description 5
- 241000894006 Bacteria Species 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000005416 organic matter Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 230000029087 digestion Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 229940005654 nitrite ion Drugs 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 231100001261 hazardous Toxicity 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- YPJKMVATUPSWOH-UHFFFAOYSA-N nitrooxidanyl Chemical compound [O][N+]([O-])=O YPJKMVATUPSWOH-UHFFFAOYSA-N 0.000 description 2
- 230000001473 noxious effect Effects 0.000 description 2
- 230000001717 pathogenic effect Effects 0.000 description 2
- 230000002085 persistent effect Effects 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000108664 Nitrobacteria Species 0.000 description 1
- 241001453382 Nitrosomonadales Species 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000001079 digestive effect Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 230000000050 nutritive effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Landscapes
- Treatment Of Sludge (AREA)
Abstract
The present invention relates to field of sludge treatment, in particular to sludge treating system and the method for a kind of high efficient resourcing and low pollution emission, object is the ammonia nitrogen concentration reducing mud after deamination, reduce organism consumption, improve biogas output, reduce the pollutant emission of sludge treatment, adopt technical scheme to be: mud carries out anaerobically fermenting and produces biogas after thermal hydrolysis and cooling, fermented sludge carries out deamination process through lowering the temperature and entering Anammox tank after mixing with nitrite solution, part deamination sludge circulation gets back to anaerobic fermentation tank, reduce the ammonia nitrogen concentration of anaerobic fermentation tank, prevent the restraining effect that ammonia nitrogen in high density generates biogas, organism contained by this part deamination mud carries out again anaerobically fermenting and produces more biogas, another part deamination mud carries out processed, and ammonia nitrogen concentration and the organic content of dewatered sludge and filtrate significantly reduce.The present invention has the high efficient resourcing of sludge treatment and the advantage of low pollution emission, economic benefit and environmental benefit high.
Description
Technical field
The present invention relates to field of sludge treatment, particularly the sludge treating system of a kind of high efficient resourcing and low pollution emission and method.
Background technology
(1) sludge anaerobic fermentative processing technology
In recent years, the raising that Chinese environmental protection requires causes the fast development of sewage disposal industry, and sewage treatment capacity and treatment capacity, sludge yield are all increased sharply.The composition of mud and chemical property complexity, both organism, plant nutrient ingredient etc. was comprised, also the hazardous and noxious substances such as heavy metal, pathogenic agent and persistent organism are comprised, mud without effectively process very easily causes secondary pollution to underground water, soil etc., and the environmental benefit of sewage treatment facility is significantly reduced.Sludge treatment should meet the requirement of innoxious, stabilization, minimizing, resource utilization, that is: the pathogenic agent in mud is killed, the hazardous and noxious substances such as the heavy metal in mud and persistent organism are effectively controlled, organic matter, various nutritive element and energy contained in mud, or safety adds in soil, or be recycled utilization by the techniques enable such as anaerobic digestion or burning source.Traditional Sludge landfill process existence takies the deficiencies such as a large amount of soil, contaminated soil and underground water, is day by day restricted; Also there is the deficiencies such as energy consumption is high, pollutant atmosphere in sludge incineration process.Sludge anaerobic fermentative processing has that energy conversion rate is high, killing pathogenic bacteria, minimizing are obvious etc., and advantage is being applied in recent years on a large scale.
Current sludge anaerobic fermentative processing technique is: first mud is heated to 150 DEG C and carries out thermal hydrolysis to 190 DEG C, the larger molecular organics in mud is made to be hydrolyzed into small organic molecule, subsequently anaerobically fermenting process is carried out to thermal hydrolysis mud, small organic molecule after thermal hydrolysis more easily produces biogas by fermentation, and wet mud per ton (water ratio 80%) can produce biogas 50 cubic metres to 80 cubic metres.After anaerobically fermenting the organic content of excess sludge low, more easily realize processed, the decrement rate of mud is up to more than 75%.
In the anaerobic digestion process of mud, along with going deep into of anaerobic digestion process, in mud, increasing nitrogen element is discharged in liquid with the form of ammonia nitrogen, ammonia nitrogen concentration in liquid is more and more higher, after ammonia nitrogen concentration reaches certain value, toxic action is produced to the methanogen in mud, suppresses organism to the conversion of methane.Therefore, when the ammonia nitrogen concentration in mud reaches this height, mud must be emitted from anaerobic fermentation tank, with this discharge process, the large amount of organic contained in mud and ammonia nitrogen together emit, the organism emitted does not convert the waste that biogas not only causes the energy to, can cause environmental pollution yet; Ammonia nitrogen containing high density in the mud emitted, also can cause secondary environmental pollution problem.
(2) Anammox deamination technology
Traditional biological eliminating ammonia nitrogen technique is nitrification-denitrification technique, and the first step is digestive process: under aerobic condition, utilizes nitrobacteria that ammonium oxidation is become nitrite and nitrate; Second is denitrification process: under anaerobic, utilizes denitrifying bacteria to be nitrogen by nitrite and nitrate reduction, finally realizes removing of ammonia nitrogen.This traditional biological eliminating ammonia nitrogen technique needs to consume a large amount of oxygen and carbon source, the electric energy that the treating processes consumption of mud is a large amount of, and cost is high; In addition, because this treatment process needs to consume a large amount of organic carbons, treating processes is subject to certain condition restriction.
Recently during the last ten years, Anammox deamination (Anaerobicammoniumoxidation) technology obtains further investigation, and obtains industrial application.Nineteen ninety-five Holland scholar Mulder Late Cambrian ammonia nitrogen disappears along with the nitrogen disappearance of nitre state, has nitrogen to generate simultaneously, and is " ANAMMOX " by this phenomenon life.By research find, Anammox deamination process be anaerobic ammonium oxidizing bacteria under anaerobic using nitrite anions as electron acceptor(EA), be the biological procedures of nitrogen by ammonium oxidation.At present, Anammox deamination technique mainly contains SHARON-ANAMMOX deamination technique and CANON deamination technique: the ultimate principle of these two kinds of techniques is: first utilize ammonium oxidation bacterium, under aerobic conditions, the ammonia oxidation of about 50% is become nitrite anions; Utilize afterwards anaerobic ammonia oxidizing bacteria under anaerobic using nitrite anions as electron acceptor(EA), ammonia nitrogen is changed into nitrogen.SHARON-ANAMMOX deamination technique and CANON deamination technique all need, under aerobic conditions, part ammonium oxidation is become nitrite anions, and then utilize this nitrite anions under anaerobic to realize deamination process.Ammonia nitrogen is oxidized in the process of nitrite anions under aerobic conditions, and partial organic substances also can be consumed because of generation oxidizing reaction, causes organic concentration to reduce.
Summary of the invention
In order to solve the problems of the prior art, the present invention proposes a kind of ammonia nitrogen concentration reducing mud after deamination, reduce organism consumption simultaneously, improve biogas output, reduce the high efficient resourcing of pollutant emission of sludge treatment and the sludge treating system of low pollution emission and method.
In order to realize above goal of the invention, the technical scheme that the sludge treating system of a kind of high efficient resourcing of the present invention and low pollution emission adopts is: comprise thermal hydrolysis tank, the mud import of thermal hydrolysis tank connects sludge pipe, the sludge outlet of thermal hydrolysis tank is connected with the import of one-level scatterer, the outlet of one-level scatterer is connected with the mud import of anaerobic fermentation tank, the sludge outlet of anaerobic fermentation tank is connected with the import of two-class heat dissipation device, the sludge outlet of two-class heat dissipation device is connected with Anammox tank, the sludge outlet of Anammox tank is connected with the import of water extracter, described anaerobic fermentation tank is connected with tank for sewage gas by biogas pipe respectively with Anammox tank,
Described two-class heat dissipation device is connected with NaOH solution tank NaOH by volume pump, or described Anammox tank is connected with NaOH solution tank NaOH by volume pump; Solution in described NaOH solution tank NaOH is nitrite solution.
Described Anammox tank is connected with one-level scatterer by circulation line, or Anammox tank is connected with anaerobic fermentation tank by circulation line.
In described anaerobic fermentation tank and Anammox tank, all agitator is set.
Be provided with the vapour pipe for heating mud in described thermal hydrolysis tank, thermal hydrolysis tank is also provided with tensimeter.
Described one-level scatterer and two-class heat dissipation device are provided with cooling tube for cooling mud and thermometer.
The method for sludge treatment of a kind of high efficient resourcing of the present invention and low pollution emission, comprises the following steps:
First carry out thermal hydrolysis to mud, the mud after thermal hydrolysis, after one-level radiating and cooling, carries out anaerobically fermenting and produces biogas and discharge; Then the mud discharged after anaerobically fermenting is after two-class heat dissipation cooling, mix with mud with nitrite solution, under anaerobic utilize nitrate radical that nitrite provides as electron acceptor(EA), ammonia nitrogen removal process is carried out to mud, be nitrogen by ammonium oxidation, and producing a small amount of biogas, nitrogen and biogas are discharged; Mud after last ammonia nitrogen removal is delivered to water extracter, completes sludge treatment.
A mud part after described ammonia nitrogen removal enters anaerobic fermentation tank by circulation line and carries out anaerobically fermenting again and produce biogas, reduces the ammonia nitrogen concentration of anaerobic fermentation tank.
In described pyrohydrolysis process, Heating temperature is 150 DEG C ~ 190 DEG C, and heat-up time is 10 ~ 50 minutes, and force value is 0.5MPa ~ 1.2MPa.
After described one-level radiating and cooling, mud temperature is 35 DEG C ~ 55 DEG C, and after two-class heat dissipation cooling, mud temperature is 20 DEG C ~ 35 DEG C.
The described anaerobically fermenting time is 15 ~ 25 days.
Compared with prior art, the solution that in present system, two-class heat dissipation device or Anammox tank are connected in NaOH solution tank NaOH with NaOH solution tank NaOH is nitrite solution, nitrite is added in mud, the nitrite anions utilizing nitrite to provide, as the electron donor of Anammox deamination process, realizes the process of Anammox deamination.Adopt present system to achieve the ammonia nitrogen concentration reducing mud after deamination, reduce again organic consumption in this process.The ammonium oxidation process eliminated under aerobic conditions of present system, but directly nitrite is added in the middle of mud, in order to meet the nitrite ion needed for Anammox denitrification process.Significantly reduced by the ammonia nitrogen concentration of the mud discharged after the process of Anammox deamination, the mud ammonia nitrogen concentration of tradition anaerobically fermenting mud discharging is high to more than 2000mg/L, the mud ammonia nitrogen concentration of present system discharge is at below 200mg/L, the mud ammonia nitrogen concentration of discharge is low, after process of the present invention, more organism changes into biogas, and in the mud of discharge, organic content significantly reduces, and the minimizing efficiency of sludge treatment is high.
Further, sludge circulation lower for ammonia nitrogen concentration after a part of deamination is turned back to anaerobic fermentation tank by present system, effectively reduces the ammonia nitrogen concentration in sludge anaerobic fermenting process, and the transformation efficiency that organism changes into biogas increases substantially; In addition, still containing the organism of higher concentration in deamination mud, these organic matter circling turn back to after anaerobic fermentation tank ferments again, further increase the transformation efficiency that organism changes into biogas.Present system effectively eliminates the toxic action of ammonia nitrogen in high density to methanogen, and achieve the fermenting process again of deamination mud organic substance, organism is high to the transformation efficiency of biogas simultaneously, and after process, the mud organic substance concentration of discharge significantly reduces.
Further, in anaerobic fermentation tank and Anammox tank, all agitator is set, mud is stirred, ensure that in anaerobic fermentation tank, sludge components is even, and Anammox tank nitrite solution mud fully mixes, improve the homogeneity in fermentation and ammonia nitrogen removal process, improve mud utilising efficiency.
Further, utilize vapour pipe to heat mud in thermal hydrolysis tank, ensure that mud has enough temperature, improve the thermal hydrolysis efficiency of mud.
Further, the cooling tube all arranged in one-level scatterer and two-class heat dissipation device, for cooling mud, carries out radiating and cooling, promotes the working efficiency of whole system.One-level scatterer and the equal set temperature meter of two-class heat dissipation device, for showing, controlling the temperature of mud.
Compared with prior art, the beneficial effect of method of the present invention is: in mud, add nitrite in the inventive method, the nitrite anions utilizing nitrite to provide is as the electron donor of Anammox deamination process, realize the process of Anammox deamination, instead of adopt SHARON-ANAMMOX deamination technique and CANON deamination technique.Adopt the advantage of method of the present invention to be: to achieve the ammonia nitrogen concentration reducing mud after deamination, reduce again organic consumption in this process simultaneously as far as possible.SHARON-ANAMMOX deamination technique and CANON deamination technique all need, under aerobic conditions, part ammonium oxidation is become nitrite anions, and then utilize this nitrite anions under anaerobic to realize deamination process, ammonia nitrogen is oxidized in the process of nitrite anions under aerobic conditions, partial organic substances also can be consumed because of generation oxidizing reaction, organic concentration is caused to reduce, and method of the present invention eliminates the ammonium oxidation process under aerobic conditions, but directly nitrite is added in the middle of mud, in order to meet the nitrite ion needed for Anammox denitrification process.
Further, in current traditional anaerobically fermenting process, methanogen in mud is produced to the generation of toxic action suppression biogas after the ammonia nitrogen concentration in mud reaches certain numerical value, now mud must be emitted from anaerobic fermentation tank, cause organic loss; And in method of the present invention, sludge circulation lower for ammonia nitrogen concentration after a part of deamination is turned back to anaerobic fermentation tank, effectively reduce the ammonia nitrogen concentration in sludge anaerobic fermenting process, the transformation efficiency that organism changes into biogas increases substantially; In addition, still containing the organism of higher concentration in deamination mud, these organic matter circling turn back to after anaerobic fermentation tank ferments again, further increase the transformation efficiency that organism changes into biogas.
Significantly reduced by the ammonia nitrogen concentration of the mud discharged after the process of Anammox deamination.The mud ammonia nitrogen concentration of tradition anaerobically fermenting mud discharging is high to more than 2000mg/L, and the mud ammonia nitrogen concentration of the present invention's discharge is at below 200mg/L, and the mud ammonia nitrogen concentration of discharge is low; The present invention effectively eliminates the toxic action of ammonia nitrogen in high density to methanogen, and achieve the fermenting process again of deamination mud organic substance, organism is high to the transformation efficiency of biogas simultaneously, and after process, the mud organic substance concentration of discharge significantly reduces.After process of the present invention, more organism changes into biogas, and in the mud of discharge, organic content significantly reduces, and the minimizing efficiency of sludge treatment is high.The ammonia nitrogen concentration of dehydration filtrate is low, and processing cost is low.
Accompanying drawing explanation
Fig. 1 is the structural representation of present system;
Wherein, 1-thermal hydrolysis tank, 2-one-level scatterer, 3-circulation line, 4-anaerobic fermentation tank, 5-cooling tube, 6-two-class heat dissipation device, 7-volume pump, 8-NaOH solution tank NaOH, 9-Anammox tank, 10-water extracter, 11-agitator, 12-biogas pipe, 13-thermometer, 14-tank for sewage gas, 15-tensimeter, 16-vapour pipe, 17-sludge pipe.
Embodiment
Below in conjunction with embodiment, the present invention will be further described.
See Fig. 1, the technical scheme that system of the present invention adopts is: comprise the thermal hydrolysis tank 1 for sludge hot hydrolysis, the vapour pipe 16 for heating mud is provided with in thermal hydrolysis tank 1, thermal hydrolysis tank 1 is also provided with tensimeter 15, the mud import of thermal hydrolysis tank 1 connects sludge pipe 17, the sludge outlet of thermal hydrolysis tank 1 is connected with the import of one-level scatterer 2, the outlet of one-level scatterer 2 is connected with the mud import of anaerobic fermentation tank 4, the sludge outlet of anaerobic fermentation tank 4 is connected with the import of two-class heat dissipation device 6, the sludge outlet of two-class heat dissipation device 6 is connected with Anammox tank 9, the sludge outlet of Anammox tank 9 is connected with the import of water extracter 10, anaerobic fermentation tank 4 is connected with tank for sewage gas 14 by biogas pipe 12 respectively with Anammox tank 9, two-class heat dissipation device 6 is connected with NaOH solution tank NaOH 8 by volume pump 7, or described Anammox tank 9 is connected with NaOH solution tank NaOH 8 by volume pump 7, and the solution in NaOH solution tank NaOH 8 is nitrite solution, Anammox tank 9 is connected with one-level scatterer 2 by circulation line 3, or Anammox tank 9 is connected with anaerobic fermentation tank 4 by circulation line 3, be provided with the cooling tube 5 for cooling mud and thermometer 13 in one-level scatterer 2 and two-class heat dissipation device 6, in anaerobic fermentation tank 4 and Anammox tank 9, agitator 11 is all set.
The method for sludge treatment of a kind of high efficient resourcing of the present invention and low pollution emission, comprises the following steps:
1) mud enters in thermal hydrolysis tank 1 by sludge pipe 17, and heat mud and make the temperature of mud maintain 150 DEG C ~ 190 DEG C, and maintaining 10 ~ 50 minutes, force value is 0.5MPa ~ 1.2MPa, obtains the mud after thermal hydrolysis;
2) mud after thermal hydrolysis enters in one-level scatterer 2, carries out radiating and cooling, makes the temperature of mud be reduced to 35 DEG C ~ 55 DEG C;
3) enter into anaerobic fermentation tank 4 through the cooled mud of one-level scatterer 2, carry out anaerobically fermenting and produce biogas, the firedamp drainage of generation, in tank for sewage gas 14, ferments after 15 ~ 25 days and is discharged from anaerobic fermentation tank 4 by mud after fermentation;
4) mud that anaerobic fermentation tank 4 discharges is delivered in two-class heat dissipation device 6, radiating and cooling is carried out to the mud after fermentation, the temperature of mud is made to be reduced to 20 DEG C ~ 35 DEG C, nitrite solution is delivered in two-class heat dissipation device 6 by volume pump 7 and mixes with mud, or nitrite solution is directly delivered in Anammox tank 9 by volume pump 7 and mixes with the cooled mud of two-class heat dissipation device 6, mixed mud stays for some time in Anammox tank 9, under anaerobic utilize nitrate radical that nitrite provides as electron acceptor(EA), be nitrogen by ammonium oxidation, also produce a small amount of biogas simultaneously, nitrogen and biogas are discharged in tank for sewage gas 14 jointly,
5) mud of low for the part after deamination in Anammox tank 9 ammonia nitrogen concentration is turned back to one-level scatterer 2 by circulation line 3 circulation, and enter into anaerobic fermentation tank 4 subsequently, or directly the mud of low for the part after deamination in Anammox tank 9 ammonia nitrogen concentration is turned back to anaerobic fermentation tank 4 by circulation line 3 circulation, the mud of low ammonia nitrogen concentration carries out anaerobically fermenting again and produces biogas in anaerobic fermentation tank 4, and biogas drains in tank for sewage gas 14; Another part mud of the low ammonia nitrogen concentration in Anammox tank 9 after deamination is delivered to water extracter 10, completes sludge treatment.
The concrete use procedure of present system: the mud import of thermal hydrolysis tank 1 is connected with sludge pipe 17, the sludge outlet of thermal hydrolysis tank 1 is connected with one-level scatterer 2, utilize the mud in vapour pipe 16 pairs of thermal hydrolysis tanks 1 to heat and make the temperature of mud maintain 150 DEG C to a certain temperature value within the scope of 190 DEG C, and maintaining 30 minutes (± 20 minutes), the force value that the tensimeter 15 that thermal hydrolysis tank is arranged shows is between 0.5MPa (gauge pressure) to 1.2MPa (gauge pressure).Concrete temperature value and force value depend on the composition and organic content etc. of mud, realize the thermal hydrolysis of mud in thermal hydrolysis tank 1.
Mud after thermal hydrolysis enters one-level scatterer 2, the cooling tube 5 arranged by one-level scatterer 2 carries out radiating and cooling, the temperature of mud is made to be reduced to 35 DEG C to a certain temperature value within the scope of 55 DEG C, temperature value is shown by the thermometer 13 arranged, and concrete mud cooling temperature depends on the composition of mud and organic content etc.
Enter into anaerobic fermentation tank 4 through the cooled mud of one-level scatterer 2 and carry out anaerobically fermenting generation biogas, after the residence time reaches a certain numerical value of 15 days to 25 days, mud after fermentation is discharged from anaerobic fermentation tank 4.The concrete residence time depends on the data such as the pH value of the composition of mud, organic content, anaerobic fermentation tank 4.Anaerobic fermentation tank 4 arranges agitator 11 pairs of mud and stirs, and guarantees that the biogas that sludge components is even, anaerobically fermenting produces is discharged in tank for sewage gas 14 in time by biogas pipe 12.
The mud that anaerobic fermentation tank 4 discharges delivers to two-class heat dissipation device 6, and the cooling tube 5 arranged by two-class heat dissipation device 6 carries out radiating and cooling, makes the temperature of mud be reduced to 20 DEG C to a certain temperature value within the scope of 35 DEG C, and temperature value is shown by the thermometer 13 arranged.Concrete mud cooling temperature depends on the composition and organic content etc. of mud.The nitrite solution deposited in NaOH solution tank NaOH 8 is delivered to two-class heat dissipation device 6 by volume pump 7 and mixes with mud, the flow of nitrite depends on ammonia nitrogen concentration and the mud discharge of the mud entering into two-class heat dissipation device 6, make the mol ratio of the nitrogen quantity of nitrite and the nitrogen quantity of ammonia nitrogen close to 1 as far as possible and be slightly less than 1, in order to avoid nitrite surplus produces secondary pollution problem.
Entering into Anammox tank 9 through the cooled mud of two-class heat dissipation device 6, there is a large amount of anaerobic ammonium oxidizing bacteria in Anammox tank 9, under anaerobic can effectively utilize nitrite anions remove ammonia nitrogen and produce nitrogen.In Anammox tank, also produce a small amount of biogas, be jointly discharged in tank for sewage gas 14 by biogas pipe 12 with the nitrogen produced.
In order to effectively control the ammonia nitrogen concentration of anaerobic fermentation tank 4, the too high biogas caused of ammonia nitrogen concentration is avoided to generate restraining effect, the mud of low for the part after deamination in Anammox tank 9 ammonia nitrogen concentration is turned back to one-level scatterer 2 by circulation line 3 circulation and entered into anaerobic fermentation tank 4 subsequently, make the ammonia nitrogen concentration of mud in anaerobic fermentation tank 4 lower than below the poisoning concentration range of methanogen, guarantee that in mud, organism transforms to biogas and maintains higher transformation efficiency.Sludge circulation with the low ammonia nitrogen concentration of part returns anaerobic fermentation tank 4, and the organism in the mud of low ammonia nitrogen concentration carries out anaerobically fermenting again in anaerobic fermentation tank 4, further increases biogas output.Another part mud of the low ammonia nitrogen concentration in Anammox tank 9 after deamination is delivered to water extracter 10.Because most ammonia-nitrogen removes in Anammox tank, the ammonia-nitrogen content of the mud cake that water extracter 10 produces and filtrate is all very low, significantly reduces the impact that polluted by nitrogen causes environment.In addition, because organism more in mud changes into biogas, the volume of the excess sludge after process of the present invention is less, and minimizing is more obvious.
The present invention compared with prior art, has the following advantages:
(1) in digested sludge, nitrite is added, the nitrite anions utilizing nitrite to provide is as the electron donor of Anammox deamination process, realize the process of Anammox deamination, instead of adopt SHARON-ANAMMOX deamination technique and CANON deamination technique.The advantage of this technical scheme is adopted to be: to achieve the ammonia nitrogen concentration reducing mud after deamination simultaneously, reduce again organic consumption in this process as far as possible.Reason is as follows: SHARON-ANAMMOX deamination technique and CANON deamination technique all need, under aerobic conditions, part ammonium oxidation is become nitrite anions, and then utilize this nitrite anions under anaerobic to realize deamination process, ammonia nitrogen is oxidized in the process of nitrite anions under aerobic conditions, partial organic substances also can be consumed because of generation oxidizing reaction, causes organic concentration to reduce.And technical scheme of the present invention eliminates the ammonium oxidation process under aerobic conditions, but directly nitrite is added in the middle of mud, in order to meet the nitrite ion needed for Anammox denitrification process.
(2) biogas output improves.Adopt traditional anaerobically fermenting process, the methanogen in mud is produced to the generation of toxic action suppression biogas after the ammonia nitrogen concentration in mud reaches certain numerical value, now mud must be emitted from anaerobic fermentation tank, cause organic loss.Sludge circulation lower for ammonia nitrogen concentration after a part of deamination is turned back to anaerobic fermentation tank by the present invention, effectively reduces the ammonia nitrogen concentration in sludge anaerobic fermenting process, and the transformation efficiency that organism changes into biogas increases substantially; In addition, still containing the organism of higher concentration in deamination mud, these organic matter circling turn back to after anaerobic fermentation tank ferments again, further increase the transformation efficiency that organism changes into biogas.
(3) sludge treatment concentration of pollution discharge is low.Significantly reduced by the ammonia nitrogen concentration of the mud discharged after the process of Anammox deamination.The mud ammonia nitrogen concentration of tradition anaerobically fermenting mud discharging is high to more than 2000mg/L, and the mud ammonia nitrogen concentration of the present invention's discharge is at below 200mg/L, and the mud ammonia nitrogen concentration of discharge is low; The present invention effectively eliminates the toxic action of ammonia nitrogen in high density to methanogen, achieve the fermenting process again of deamination mud organic substance simultaneously, organism is high to the transformation efficiency of biogas, after process, the mud organic substance concentration of discharge significantly reduces, and the organic concentration contained in the filtrate of discharge significantly reduces.
(4) the minimizing efficiency of sludge treatment is high.After process of the present invention, more organism changes into biogas, and the sludge quality of discharge significantly reduces.
Claims (10)
1. the sludge treating system of a high efficient resourcing and low pollution emission, it is characterized in that: comprise the thermal hydrolysis tank (1) for sludge hot hydrolysis, thermal hydrolysis tank (1) is provided with tensimeter (15), the mud import of thermal hydrolysis tank (1) connects sludge pipe (17), the sludge outlet of thermal hydrolysis tank (1) is connected with the import of one-level scatterer (2), the outlet of one-level scatterer (2) is connected with the mud import of anaerobic fermentation tank (4), the sludge outlet of anaerobic fermentation tank (4) is connected with the import of two-class heat dissipation device (6), the sludge outlet of two-class heat dissipation device (6) is connected with Anammox tank (9), the sludge outlet of Anammox tank (9) is connected with the import of water extracter (10), described anaerobic fermentation tank (4) is connected with tank for sewage gas (14) by biogas pipe (12) respectively with Anammox tank (9), described one-level scatterer (2) and two-class heat dissipation device (6) are provided with thermometer (13),
Described two-class heat dissipation device (6) is connected with NaOH solution tank NaOH (8) by volume pump (7), or described Anammox tank (9) is connected with NaOH solution tank NaOH (8) by volume pump (7); Solution in described NaOH solution tank NaOH (8) is nitrite solution.
2. the sludge treating system of high efficient resourcing according to claim 1 and low pollution emission, it is characterized in that: described Anammox tank (9) is connected with one-level scatterer (2) by circulation line (3), or Anammox tank (9) is connected with anaerobic fermentation tank (4) by circulation line (3).
3. the sludge treating system of high efficient resourcing according to claim 1 and low pollution emission, is characterized in that: all arrange agitator (11) in described anaerobic fermentation tank (4) and Anammox tank (9).
4. the sludge treating system of high efficient resourcing according to claim 1 and low pollution emission, is characterized in that: be provided with the vapour pipe (16) for heating mud in described thermal hydrolysis tank (1).
5. the sludge treating system of high efficient resourcing according to claim 1 and low pollution emission, is characterized in that: described one-level scatterer (2) and two-class heat dissipation device (6) are provided with the cooling tube (5) for cooling mud.
6. a method for sludge treatment for high efficient resourcing and low pollution emission, is characterized in that: comprise the following steps:
First carry out thermal hydrolysis to mud, the mud after thermal hydrolysis, after one-level radiating and cooling, carries out anaerobically fermenting and produces biogas and discharge; Then the mud discharged after anaerobically fermenting is after two-class heat dissipation cooling, mix with mud with nitrite solution, under anaerobic utilize nitrite anions that nitrite provides as electron acceptor(EA), ammonia nitrogen removal process is carried out to mud, be nitrogen by ammonium oxidation, and producing a small amount of biogas, nitrogen and biogas are discharged; Mud after last ammonia nitrogen removal is delivered to water extracter, completes sludge treatment.
7. the method for sludge treatment of high efficient resourcing according to claim 6 and low pollution emission, it is characterized in that: the mud part after described ammonia nitrogen removal enters anaerobic fermentation tank by circulation line and carries out anaerobically fermenting again and produce biogas, reduces the ammonia nitrogen concentration of anaerobic fermentation tank.
8. the method for sludge treatment of high efficient resourcing according to claim 6 and low pollution emission, is characterized in that: in described pyrohydrolysis process, Heating temperature is 150 DEG C ~ 190 DEG C, and heat-up time is 10 ~ 50 minutes, and force value is 0.5MPa ~ 1.2MPa.
9. the method for sludge treatment of high efficient resourcing according to claim 6 and low pollution emission, is characterized in that: after described one-level radiating and cooling, mud temperature is 35 DEG C ~ 55 DEG C, and after two-class heat dissipation cooling, mud temperature is 20 DEG C ~ 35 DEG C.
10. the method for sludge treatment of high efficient resourcing according to claim 6 and low pollution emission, is characterized in that: the described anaerobically fermenting time is 15 ~ 25 days.
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| CN111302586A (en) * | 2020-02-05 | 2020-06-19 | 哈尔滨工业大学 | Treatment method for recycling domestic sludge of sewage plant |
| CN113336404A (en) * | 2021-04-29 | 2021-09-03 | 北京城市排水集团有限责任公司 | Resource method for developing thermal hydrolysis sludge carbon source |
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| CN102515454A (en) * | 2011-12-22 | 2012-06-27 | 湖北国新天汇能源有限公司 | Device and method for realizing thermal-hydrolysis fermentation treatment in rotation way |
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| CN102515454A (en) * | 2011-12-22 | 2012-06-27 | 湖北国新天汇能源有限公司 | Device and method for realizing thermal-hydrolysis fermentation treatment in rotation way |
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