CN104150729A - System and method for treating sludge with efficient recycling and low pollution emission - Google Patents
System and method for treating sludge with efficient recycling and low pollution emission Download PDFInfo
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- CN104150729A CN104150729A CN201410437275.1A CN201410437275A CN104150729A CN 104150729 A CN104150729 A CN 104150729A CN 201410437275 A CN201410437275 A CN 201410437275A CN 104150729 A CN104150729 A CN 104150729A
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- anaerobic fermentation
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- 239000010802 sludge Substances 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 76
- 238000004064 recycling Methods 0.000 title abstract 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 83
- 238000000855 fermentation Methods 0.000 claims abstract description 56
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims abstract description 32
- 238000001816 cooling Methods 0.000 claims abstract description 28
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 77
- 230000008569 process Effects 0.000 claims description 37
- 238000009283 thermal hydrolysis Methods 0.000 claims description 35
- 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 28
- 230000004087 circulation Effects 0.000 claims description 21
- 238000012545 processing Methods 0.000 claims description 21
- 229910052757 nitrogen Inorganic materials 0.000 claims description 17
- 230000008676 import Effects 0.000 claims description 16
- 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 6
- 238000007599 discharging Methods 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- YPJKMVATUPSWOH-UHFFFAOYSA-N nitrooxidanyl Chemical compound [O][N+]([O-])=O YPJKMVATUPSWOH-UHFFFAOYSA-N 0.000 claims description 3
- 230000007062 hydrolysis Effects 0.000 claims description 2
- 238000006460 hydrolysis reaction Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 4
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000003344 environmental pollutant Substances 0.000 abstract description 3
- 239000005416 organic matter Substances 0.000 abstract description 3
- 231100000719 pollutant Toxicity 0.000 abstract description 3
- 229910021529 ammonia Inorganic materials 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract 1
- 230000003301 hydrolyzing effect Effects 0.000 abstract 1
- 230000005764 inhibitory process Effects 0.000 abstract 1
- 230000009615 deamination Effects 0.000 description 46
- 238000006481 deamination reaction Methods 0.000 description 46
- -1 nitrite anions Chemical class 0.000 description 15
- 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
- 239000002689 soil Substances 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 3
- 230000029087 digestion Effects 0.000 description 3
- 239000000706 filtrate Substances 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
- 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
- 230000001473 noxious effect Effects 0.000 description 2
- 230000001717 pathogenic effect Effects 0.000 description 2
- 230000002085 persistent effect 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
- 150000001450 anions Chemical class 0.000 description 1
- 238000013459 approach Methods 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
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000001079 digestive effect 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
- 230000000452 restraining effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization 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 invention relates to the field of sludge treatment and in particular relates to a system and a method for treating sludge with efficient recycling and low pollution emission to reduce the ammonia nitrogen concentration of deaminated sludge, reduce the organic matter consumption, increase the biogas yield and reduce the pollutant emission in sludge treatment. The invention adopts the technical scheme as follows: the method comprises the following steps: thermally hydrolyzing the sludge, cooling, performing anaerobic fermentation to generate biogas, cooling the fermented sludge, mixing with a nitrite solution, deaminating in an anaerobic ammonia oxidation tank, circularly returning one part of the deaminated sludge to an anaerobic fermentation tank to reduce the ammonia nitrogen concentration of the anaerobic fermentation tank and prevent the inhibition effect of high-concentration ammonia nitrogen on the biogas, and performing anaerobic fermentation on organic matters in the part of the deaminated sludge to generate more biogas; dehydrating another part of the deaminated sludge to greatly reduce the ammonia nitrogen concentration and the organic matter content of the dehydrated sludge and filter liquor. The system and the method have the advantages of efficient recycling and low pollution emission in sludge treatment, and have high economic and environmental benefits.
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. had been comprised, also comprise the hazardous and noxious substances such as heavy metal, pathogenic agent and persistent organism, very easily underground water, soil etc. are caused to secondary pollution without the mud of effectively processing, the environmental benefit of sewage treatment facility is significantly reduced.That sludge treatment should meet is innoxious, the requirement of stabilization, minimizing, resource utilization, that is: kill the pathogenic agent in mud, the hazardous and noxious substances such as heavy metal and persistent organism in mud is effectively controlled, contained organic matter, various nutritive element and energy in mud, or add in soil safely, or be recycled utilization by the techniques enable such as anaerobic digestion or burning source.Traditional Sludge landfill is processed to exist and is taken the deficiencies such as a large amount of soils, contaminated soil and underground water, is day by day restricted; Sludge incineration is processed and is also had the deficiencies such as energy consumption is high, pollutant atmosphere.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 to 190 DEG C and carries out thermal hydrolysis, make the larger molecular organics in mud be hydrolyzed into small organic molecule, subsequently thermal hydrolysis mud is carried out to anaerobically fermenting processing, small organic molecule after thermal hydrolysis more easily produces biogas by fermentation, and wet mud per ton (water ratio 80%) can produce 50 cubic metres to 80 cubic metres of biogas.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, when ammonia nitrogen concentration reaches after certain value, methanogen in mud is produced to toxic action, suppress the conversion of organism to methane.Therefore, in the time that the ammonia nitrogen concentration in mud reaches this height, mud must be emitted from anaerobic fermentation tank, follow this discharge process, the large amount of organic and the ammonia nitrogen that in mud, contain together emit, the organism emitting does not convert biogas to not only causes the waste of the energy, also can cause environmental pollution; In the mud emitting, contain the ammonia nitrogen of high density, also can cause secondary environmental pollution problem.
(2) Anammox deamination technology
Traditional biological eliminating ammonia nitrogen technique is nitrated-denitrification process, and the first step is digestive process: under aerobic condition, utilize nitrobacteria that ammonia nitrogen is oxidized to nitrite and nitrate; Second is denitrification process: under anaerobic, utilizing denitrifying bacteria is nitrogen by nitrite and nitrate reduction, finally realizes removing of ammonia nitrogen.This traditional biological eliminating ammonia nitrogen technique need to consume a large amount of oxygen and carbon source, a large amount of electric energy for the treatment of processes consumption of mud, and cost is high; In addition,, because this treatment process need to consume a large amount of organic carbons, treating processes is subject to certain condition restriction.
Recently during the last ten years, Anammox deamination (Anaerobic ammonium oxidation) technology has obtained further investigation, and has obtained industrial application.Nineteen ninety-five Holland scholar Mulder finds that ammonia nitrogen, along with the nitrogen of nitre state disappears and disappears, has nitrogen to generate simultaneously first, 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), ammonia nitrogen is oxidized to the biological procedures of nitrogen.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 ammonia nitrogen oxidation bacterium, under aerobic conditions, the ammonia oxidation of 50% left and right is become to 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 to be oxidized to nitrite anions by part ammonia nitrogen under aerobic conditions, and then utilize this nitrite anions under anaerobic to realize deamination processing.Ammonia nitrogen is oxidized in the process of nitrite anions under aerobic conditions, and partial organic substances also can be consumed because of there is 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 that reduces mud after deamination, reduce organism consumption simultaneously, improve biogas output, reduce the high efficient resourcing of pollutant emission and the sludge treating system of low pollution emission and the method for sludge treatment.
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 and Anammox tank are connected with tank for sewage gas respectively by biogas pipe,
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, agitator is all set.
In described thermal hydrolysis tank, be provided with the vapour pipe for heating mud, on thermal hydrolysis tank, be also provided with tensimeter.
Described one-level scatterer and two-class heat dissipation device are provided with cooling tube and the thermometer for cooling mud.
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 mud is carried out to thermal hydrolysis, the mud after thermal hydrolysis, after one-level radiating and cooling, carries out anaerobically fermenting and produces biogas and discharge; Then the mud discharging 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), mud is carried out to ammonia nitrogen removal processing, ammonia nitrogen is oxidized to nitrogen, 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 carries out again anaerobically fermenting and produces biogas, reduces the ammonia nitrogen concentration of anaerobic fermentation tank.
In described pyrohydrolysis process, Heating temperature is 150 DEG C～190 DEG C, and be 10～50 minutes heat-up time, 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 system of the present invention, two-class heat dissipation device or Anammox tank are connected in NaOH solution tank NaOH with NaOH solution tank NaOH is nitrite solution, in mud, add nitrite, utilize nitrite anions that nitrite the provides electron donor as Anammox deamination process, realize the processing of Anammox deamination.The ammonia nitrogen concentration that adopts system of the present invention to realize to reduce mud after deamination, reduces again organic consumption in this process.The omission of system of the present invention ammonia nitrogen oxidising process under aerobic conditions, but directly nitrite is added in the middle of mud, in order to meet the required nitrite ion of Anammox denitrification process.After processing by Anammox deamination, the ammonia nitrogen concentration of the mud of discharge significantly reduces, the mud ammonia nitrogen concentration of tradition anaerobically fermenting mud discharging is high to more than 2000mg/L, the mud ammonia nitrogen concentration of system discharge of the present invention is below 200mg/L, the mud ammonia nitrogen concentration of discharge is low, after the present invention processes, 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, the sludge circulation that after a part of deamination, ammonia nitrogen concentration is lower is turned back to anaerobic fermentation tank by system of 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, in deamination mud, still contain the organism of higher concentration, the circulation of these organism turns back to anaerobic fermentation tank ferment again after, further improved organism and changed into the transformation efficiency of biogas.System of the present invention has effectively been eliminated the toxic action of ammonia nitrogen in high density to methanogen, has realized the fermenting process again of deamination mud organic substance simultaneously, and organism is high to the transformation efficiency of biogas, and after processing, the mud organic substance concentration of discharge significantly reduces.
Further, in anaerobic fermentation tank and Anammox tank, agitator is all set, mud is stirred, guarantee 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, improved mud utilising efficiency.
Further, in thermal hydrolysis tank, utilize vapour pipe heating mud, ensured that mud has enough temperature, improved the thermal hydrolysis efficiency of mud.
Further, the cooling tube all arranging 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.The equal set temperature meter of one-level scatterer and two-class heat dissipation device, for showing, control the temperature of mud.
Compared with prior art, the beneficial effect of method of the present invention is: in the inventive method, in mud, add nitrite, utilize nitrite anions that nitrite the provides electron donor as Anammox deamination process, realize the processing 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 realize the ammonia nitrogen concentration that reduces mud after deamination, reduced again organic consumption in this process simultaneously as far as possible.SHARON-ANAMMOX deamination technique and CANON deamination technique all need to be oxidized to nitrite anions by part ammonia nitrogen under aerobic conditions, and then utilize this nitrite anions under anaerobic to realize deamination processing, ammonia nitrogen is oxidized in the process of nitrite anions under aerobic conditions, partial organic substances also can be consumed because of there is oxidizing reaction, cause organic concentration to reduce, and method of the present invention has been omitted the ammonia nitrogen oxidising process under aerobic conditions, but directly nitrite is added in the middle of mud, in order to meet the required nitrite ion of Anammox denitrification process.
Further, during current traditional anaerobically fermenting is processed, after the ammonia nitrogen concentration in mud reaches certain numerical value, the methanogen in mud is produced to the generation that toxic action suppresses biogas, now mud must be emitted from anaerobic fermentation tank, cause organic loss; And in method of the present invention, the sludge circulation that after a part of deamination, ammonia nitrogen concentration is lower is turned back to anaerobic fermentation tank, and effectively reducing the ammonia nitrogen concentration in sludge anaerobic fermenting process, the transformation efficiency that organism changes into biogas increases substantially; In addition, in deamination mud, still contain the organism of higher concentration, the circulation of these organism turns back to anaerobic fermentation tank ferment again after, further improved organism and changed into the transformation efficiency of biogas.
After processing by Anammox deamination, the ammonia nitrogen concentration of the mud of discharge significantly reduces.The mud ammonia nitrogen concentration of tradition anaerobically fermenting mud discharging is high more than 2000mg/L, and the mud ammonia nitrogen concentration of the present invention's discharge is below 200mg/L, and the mud ammonia nitrogen concentration of discharge is low; The present invention has effectively eliminated the toxic action of ammonia nitrogen in high density to methanogen, has realized the fermenting process again of deamination mud organic substance simultaneously, and organism is high to the transformation efficiency of biogas, and after processing, the mud organic substance concentration of discharge significantly reduces.After the present invention processes, 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.
Brief description of the drawings
Fig. 1 is the structural representation of system of the present invention;
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.
Referring to Fig. 1, the technical scheme that system of the present invention adopts is: comprise the thermal hydrolysis tank 1 for sludge hot hydrolysis, in thermal hydrolysis tank 1, be provided with the vapour pipe 16 for heating mud, on thermal hydrolysis tank 1, be 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 and Anammox tank 9 are connected with tank for sewage gas 14 respectively by biogas pipe 12, 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, in one-level scatterer 2 and two-class heat dissipation device 6, be provided with cooling tube 5 and thermometer 13 for cooling mud, in anaerobic fermentation tank 4 and Anammox tank 9, agitator 11 be 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, mud is heated and makes the temperature of mud maintain 150 DEG C～190 DEG C, and maintain 10～50 minutes, and 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 one-level scatterer 2 cooled mud, carry out anaerobically fermenting and produce biogas, the firedamp drainage of generation, in tank for sewage gas 14, ferments and after 15～25 days, mud after fermentation is discharged from anaerobic fermentation tank 4;
4) mud that anaerobic fermentation tank 4 discharges is delivered in two-class heat dissipation device 6, mud after fermentation is carried out to radiating and cooling, make the temperature of mud be reduced to 20 DEG C～35 DEG C, nitrite solution is delivered in two-class heat dissipation device 6 and is mixed with mud by volume pump 7, or nitrite solution is directly delivered in Anammox tank 9 and is mixed with the cooled mud of two-class heat dissipation device 6 by volume pump 7, mixed mud stays for some time in Anammox tank 9, under anaerobic utilize nitrate radical that nitrite provides as electron acceptor(EA), ammonia nitrogen is oxidized to nitrogen, also produce a small amount of biogas simultaneously, nitrogen and biogas are discharged in tank for sewage gas 14 jointly,
5) mud of the low ammonia nitrogen concentration of a part after interior Anammox tank 9 deamination is turned back to one-level scatterer 2 by circulation line 3 circulations, and enter into subsequently anaerobic fermentation tank 4, or directly the mud of the low ammonia nitrogen concentration of a part after interior Anammox tank 9 deamination is turned back to anaerobic fermentation tank 4 by circulation line 3 circulations, the mud of low ammonia nitrogen concentration carries out again anaerobically fermenting 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 after the interior deamination of Anammox tank 9 is delivered to water extracter 10, completes sludge treatment.
The concrete use procedure of system of the present invention: 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 vapour pipe 16 to heat the mud in thermal hydrolysis tank 1 and make the temperature of mud maintain a certain temperature value within the scope of 150 DEG C to 190 DEG C, and maintaining 30 minutes (± 20 minutes), the force value that the tensimeter 15 of thermal hydrolysis tank setting shows is that 0.5MPa (gauge pressure) is between 1.2MPa (gauge pressure).Concrete temperature value and force value depend on composition and the organic content etc. of mud, at the interior thermal hydrolysis of realizing mud of thermal hydrolysis tank 1.
Mud after thermal hydrolysis enters one-level scatterer 2, the cooling tube 5 arranging by one-level scatterer 2 carries out radiating and cooling, make the temperature of mud be reduced to a certain temperature value within the scope of 35 DEG C to 55 DEG C, temperature value by arrange thermometer 13 show, concrete mud cooling temperature depends on composition and the organic content etc. of mud.
Enter into anaerobic fermentation tank 4 through one-level scatterer 2 cooled mud and carry out anaerobically fermenting generation biogas, reach after a certain numerical value of 15 days to 25 days when the residence time, mud after fermentation is discharged from anaerobic fermentation tank 4.The concrete residence time is depended on the data such as composition, organic content, the pH value of anaerobic fermentation tank 4 of mud.Anaerobic fermentation tank 4 arranges agitator 11 mud is stirred, 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 is delivered to two-class heat dissipation device 6, and the cooling tube 5 arranging by two-class heat dissipation device 6 carries out radiating and cooling, makes the temperature of mud be reduced to a certain temperature value within the scope of 20 DEG C to 35 DEG C, and temperature value shows by the thermometer 13 arranging.Concrete mud cooling temperature depends on composition and the organic content etc. of mud.The nitrite solution of depositing in NaOH solution tank NaOH 8 is delivered to two-class heat dissipation device 6 by volume pump 7 to be mixed with mud, the flow of nitrite depends on ammonia nitrogen concentration and the mud discharge of the mud that enters into two-class heat dissipation device 6, make the mol ratio of the nitrogen amount of nitrite and the nitrogen amount of ammonia nitrogen approach 1 and be slightly less than 1, in order to avoid the superfluous secondary pollution problem that produces of nitrite as far as possible.
Enter into Anammox tank 9 through two-class heat dissipation device 6 cooled mud, there are a large amount of anaerobic ammonium oxidizing bacterias in Anammox tank 9, under anaerobic can effectively utilize nitrite anions ammonia nitrogen to be removed and produced 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 producing.
In order effectively to control the ammonia nitrogen concentration of anaerobic fermentation tank 4, avoid the too high biogas causing of ammonia nitrogen concentration to generate restraining effect, the mud of the low ammonia nitrogen concentration of a part after interior Anammox tank 9 deamination is turned back to one-level scatterer 2 and entered into subsequently anaerobic fermentation tank 4 by circulation line 3 circulation, below the poisoning concentration range of the ammonia nitrogen concentration that makes anaerobic fermentation tank 4 interior mud lower than methanogen, guarantee that in mud, organism transforms and maintain higher transformation efficiency to biogas.Follow the sludge circulation of the low ammonia nitrogen concentration of part to return to anaerobic fermentation tank 4, the organism in the mud of low ammonia nitrogen concentration carries out anaerobically fermenting again in anaerobic fermentation tank 4, has further increased biogas output.Another part mud of the low ammonia nitrogen concentration after the interior deamination of Anammox tank 9 is delivered to water extracter 10.Because most ammonia-nitrogen removes in Anammox tank, the mud cake that water extracter 10 produces and the ammonia-nitrogen content of filtrate are all very low, significantly reduce the impact that polluted by nitrogen causes environment.In addition,, because more organism in mud changes into biogas, less through the volume of excess sludge after treatment of the present invention, minimizing is more obvious.
The present invention compared with prior art, has the following advantages:
(1) in digested sludge, add nitrite, utilize nitrite anions that nitrite the provides electron donor as Anammox deamination process, realize the processing of Anammox deamination, instead of adopt SHARON-ANAMMOX deamination technique and CANON deamination technique.Adopt the advantage of this technical scheme to be: to realize the ammonia nitrogen concentration that reduces mud after deamination simultaneously, reduced again organic consumption in this process as far as possible.Reason is as follows: SHARON-ANAMMOX deamination technique and CANON deamination technique all need to be oxidized to nitrite anions by part ammonia nitrogen under aerobic conditions, and then utilize this nitrite anions under anaerobic to realize deamination processing, ammonia nitrogen is oxidized in the process of nitrite anions under aerobic conditions, partial organic substances also can be consumed because of there is oxidizing reaction, causes organic concentration to reduce.And technical scheme of the present invention has been omitted the ammonia nitrogen oxidising process under aerobic conditions, but directly nitrite is added in the middle of mud, in order to meet the required nitrite ion of Anammox denitrification process.
(2) biogas output improves.Adopt traditional anaerobically fermenting processing, after the ammonia nitrogen concentration in mud reaches certain numerical value, the methanogen in mud is produced to the generation that toxic action suppresses biogas, now mud must be emitted from anaerobic fermentation tank, cause organic loss.The sludge circulation that after a part of deamination, ammonia nitrogen concentration is lower 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, in deamination mud, still contain the organism of higher concentration, the circulation of these organism turns back to anaerobic fermentation tank ferment again after, further improved organism and changed into the transformation efficiency of biogas.
(3) sludge treatment concentration of pollution discharge is low.After processing by Anammox deamination, the ammonia nitrogen concentration of the mud of discharge significantly reduces.The mud ammonia nitrogen concentration of tradition anaerobically fermenting mud discharging is high more than 2000mg/L, and the mud ammonia nitrogen concentration of the present invention's discharge is below 200mg/L, and the mud ammonia nitrogen concentration of discharge is low; The present invention has effectively eliminated the toxic action of ammonia nitrogen in high density to methanogen, realized the fermenting process again of deamination mud organic substance simultaneously, organism is high to the transformation efficiency of biogas, after processing, the mud organic substance concentration of discharge significantly reduces, and the organic concentration containing in the filtrate of discharge significantly reduces.
(4) the minimizing efficiency of sludge treatment is high.After the present invention processes, 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, 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) and Anammox tank (9) are connected with tank for sewage gas (14) respectively by biogas pipe (12),
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: in described anaerobic fermentation tank (4) and Anammox tank (9), agitator (11) is all set.
4. the sludge treating system of high efficient resourcing according to claim 1 and low pollution emission, it is characterized in that: in described thermal hydrolysis tank (1), be provided with the vapour pipe (16) for heating mud, on thermal hydrolysis tank (1), be also provided with tensimeter (15).
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 cooling tube (5) and the thermometer (13) 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 mud is carried out to thermal hydrolysis, the mud after thermal hydrolysis, after one-level radiating and cooling, carries out anaerobically fermenting and produces biogas and discharge; Then the mud discharging 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), mud is carried out to ammonia nitrogen removal processing, ammonia nitrogen is oxidized to nitrogen, 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 carries out again anaerobically fermenting and produces biogas, reduce 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 be 10～50 minutes heat-up time, 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 | A kind of treatment method of domestic sludge resource utilization of sewage treatment 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 |
| CN113620552A (en) * | 2021-10-12 | 2021-11-09 | 中节能润达(烟台)环保股份有限公司 | Clean and efficient sewage plant sludge source treatment system and method |
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