CN101698559B - Organic sludge resource recovery processing method - Google Patents
Organic sludge resource recovery processing method Download PDFInfo
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- CN101698559B CN101698559B CN2009103093670A CN200910309367A CN101698559B CN 101698559 B CN101698559 B CN 101698559B CN 2009103093670 A CN2009103093670 A CN 2009103093670A CN 200910309367 A CN200910309367 A CN 200910309367A CN 101698559 B CN101698559 B CN 101698559B
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/20—Sludge processing
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Abstract
The invention discloses a resource recycling treatment method of organic sludge, which comprises the steps of concentrating sludge to ensure that the solid content reaches the sludge inlet standard and then feeding the sludge into a reactor; starting the thermal digestion of the organic sludge in the reactor, and automatically heating the sludge in the reactor to 48-52 ℃ after the start; the sludge in the starting stage enters a thermal digestion operation stage, the sludge is subjected to high-temperature facultative hydrolytic acidification in a first reaction zone, and high-temperature microaerobic digestion is performed in a second reaction zone; and in the operation stage, the digested sludge discharged from the second reaction zone is cooled by a heat exchanger and then is sent into a mechanical dehydration device for mechanical dehydration, and is made into a mud cake for outward transportation. The sludge can be stabilized and harmlessly treated by the method, a large amount of nutrients such as nitrogen, phosphorus, potassium and the like in the sludge are reserved, and the sludge can be used as a fertilizer or an additive for improving soil for safe agriculture to achieve the purpose of recycling the sludge.
Description
Technical field
The present invention relates to method for sludge treatment, particularly be used for the treatment process that a kind of organic sludge as resources reclaims.
Background technology
In the municipal sewage treatment process, certainly lead to a large amount of mud, mud typically refers to main floss by various mikrobes and organic and inorganic granulometric composition.When mud is staple with the organism, then be called organic sludge.Nineteen ninety-five, world's water surrounding tissue has utility value again in order to reflect most sewage sludges exactly, mud is renamed as " biosolids ", and its precise meaning is: " a kind of urban pollutant that can effectively utilize, be rich in organic matter ".
Sludge treatment method mainly contains 3 kinds at present: comprehensive utilization, landfill and burning.If take the method for landfill, occupy the land resources of a large amount of preciousnesses on the one hand, and cause rubbish Cheng Shan, secondary pollution surrounding environment and soil, be unfavorable for protecting environment; It is huge to adopt the method for burning then to invest, and has only minority sewage work to select this technology; Comprehensive utilization generally is meant as the plant compost, but contains in the mud plant and the deleterious germ of soil, parasitic ovum, hardly degraded organic substance, the objectionable impurities in the plant absorbing mud possibly occur, gets into the problem that food chain influences HUMAN HEALTH.
Domestic a lot of municipal sewage plants directly adopt mechanical dehydration at present, and this has brought a series of environmental problems for the follow-up disposal of mud.Though the many sewage works of China have built up the facility of anaerobic sludge digestion because operational management is comparatively complicated, do not reach due treatment effect, have in addition can not run well for a long time.General sludge anaerobic stabilization treatment, traditional aerobic sigestion are handled, because the facility floor space is bigger, can run into difficulty on the ground in the city enforcement densely populated, that land used is nervous.
Chinese patent document CN1010373354A discloses a kind of method of utilizing organic sludge to produce liquid fertilizer.Comprise that using ultrasonic and sodium hydroxide combination treatment water ratio is 98% excess sludge, make a large amount of strippings of organism, obtain thickened sludge and supernatant after the spinning, the former neutralizes the back by ordinary method conditioning dehydration, obtains water ratio and be 70%～80% mud cake; Among the latter with after handle through sand filtration, two-stage ultrafiltering successively, obtain containing the liquid concentrator and the filtered solution that contains low molecule organic matter of larger molecular organics such as humic acids, liquid concentrator can be used as organic liquid fertilizer, filtered solution gets into sewage work's front-end processing.The characteristics of this method are that the treatment time is short, but material consumption and energy consumption are all higher, and mud cake wherein can not utilize, and also need carry out landfill disposal.
In the processing to mud, the hot digestion techniques of mud has also appearred.The hot digestion techniques of mud and traditional sludge digestion compared with techniques, related principle is the same, all is through mikrobe organism to be degraded to reach sludge stabilization and innoxious.With traditional sludge digestion compared with techniques; The hot digestion techniques of mud has powerful, the multiple digestive function of digestive function, system's less investment, operational process less energy consumption, digestion time is short and littler advantages such as digester volume; And at high temperature can remove pathogenic agent, but the finished product meet the A grade standard requirement of stipulating in U.S. EPA 503 clauses of resource recovery.
Chinese patent document CN 101020594A (number of patent application 200610124008.4) discloses a kind of device of mud heat digestion preparation biosolids; Its technical scheme and embodiment 2 disclose two retort series connection that utilize this device and have carried out the automatic froth breaking high temperature aerobic digestion of mud self-heating technology: adopt intermittent type to advance mud; Retort 1 bath temperature transfers to 60 ℃; Open whipping appts and aerating apparatus; When reaction proceeded to about 3 days, proceeds digestion in second retort of mud entering of from first retort, coming out after the digestion; Second retort started agitator motor and aerating apparatus; But do not start the water-bath device, mud carries out the automatic froth breaking high temperature aerobic digestion of self-heating in second retort, digest 5～7 days once more after; Part mud is got rid of from mud discharging mouth 18, obtains A level biosolids; Embodiment 2 also openly utilizes this technology operation after 7 days, and the average DO concentration of mud is 8.0mg/L, ORP average out to 260mv.This method need be opened the electrothermal tube heating in water bath in the fs of the automatic froth breaking high temperature aerobic digestion of mud self-heating technology, has increased energy consumption, and has limited the through engineering approaches application of this apparatus and method; From its operation 7 days after the average DO concentration of mud 8.0mg/L find out that this technology aeration rate is very big, brought heat lost by radiation and high energy consumption problem.
Summary of the invention
The objective of the invention is defective, a kind of method for recycling and processing organic sludge as resources is provided to sludge treatment technique in the prior art.
The technical scheme that realizes the object of the invention is a kind of method for recycling and processing organic sludge as resources; The treatment system that is adopted comprises concentrating unit, reactor drum, interchanger and mechanical dehydration device; Wherein reactor drum comprises first reaction zone and second reaction zone, and the volume of second reaction zone is 1.5～4 times of the first reaction zone volumetrical; This method may further comprise the steps:
1. mud concentrates in concentrating unit: concentrate back mud meet solid content be 3%～10% advance the mud standard;
2. the startup of organic sludge heat digestion in reactor drum: thickened sludge is through first reaction zone and second reaction zone of steam piano difference suction reactor drum; After all filling, two reaction zones carry out aeration; And constantly mix; Reactor temperature constantly rises, and accomplishes the startup of heat digestion when being warming up to 48 ℃～52 ℃; When reactor temperature does not reach 48 ℃ situation if occurrence temperature no longer rises; Then discharge the mud of 1/3～2/3 volumes at two reaction zones; And then replenish with volume mud; Carry out aeration, and constantly mix, in two reaction zones temperature under the effect of mikrobe and stirring all from being warming up to 48 ℃～52 ℃;
3. the operation of organic sludge heat digestion in reactor drum: this moment, whole organic sludge treatment system was in normal operating phase, and the operation scheme that is adopted is the semi continuous operation scheme; Wherein, second reaction zone is spoil disposal for the first time, 3%～20% mud of the second reaction zone TV of draining; Open transferpump behind the spoil disposal mud of first reaction zone is added to second reaction zone, mend fullly up to second reaction zone, then fresh sludge is replenished full first reaction zone from concentrating unit; Second reaction zone spoil disposal for the second time after half a day to one day; Spoil disposal, the operation of advancing mud are the same, and the first reaction zone limited aeration, and thickened sludge carries out the acidifying of high temperature concurrent oxidation and aquoiysis in first reaction zone; Temperature is between 45 ℃～55 ℃ in first reaction zone; Second reaction zone adopts air aeration, and thickened sludge carries out high-temperature micro-aerobic digestion in second reaction zone, and temperature is between 52 ℃～65 ℃ in second reaction zone; The normal operating phase branch advances mud spoil disposal phase and two phases of operating period; Reflux pump with two reaction zones when advancing the mud spoil disposal stops and aeration is stopped; After advancing the end of mud and spoil disposal, again the sludge reflux pump and the aerating apparatus of first reaction zone and second reaction zone are opened again;
4. 3. step is lowered the temperature through interchanger through the digested sludge of second reaction zone discharging, the waste heat of discharging mud carries out heat exchange by recirculated water through the mud in the circulating water pipeline and first reaction zone and is transported to first reaction zone;
5. the mechanical dehydration device is sent in the digested sludge after 4. step being lowered the temperature, and carries out mechanical dehydration, and processes the mud cake outward transport.
Above-mentioned treatment system also comprises membrane treatment appts, and the foul smell that 3. 2. step produce in the treating processes with step gets into and enters atmosphere again after membrane treatment appts is handled.
The said first reaction zone limited aeration makes that dissolved oxygen concentration is 0.01～0.1mg/L; Second reaction zone adopts air aeration, makes that dissolved oxygen concentration is 0.1～0.5mg/L.
The mean residence time of organic sludge in first reaction zone is shorter, and the mean residence time in second reaction zone is longer, and the mean residence time in second reaction zone is 1.5～4 times at first reaction zone.
Be higher than 3% mud for solid content, need do not concentrate and directly to get into reactor drum.
Handle the mud of spring and autumn, step is the total residence time average out to of fresh sludge in reactor drum 10 days 3., and first reaction zone and second reaction zone spoil disposal every day once advance mud once, sludge volume with advance the mud amount be in the reactor drum mud total amount 1/10.
Handle the mud in summer, step is the total residence time average out to of fresh sludge in reactor drum 12 days 3., and first reaction zone and second reaction zone spoil disposal every day once advance mud once, sludge volume with advance the mud amount be in the reactor drum mud total amount 1/12.
Handle the mud in winter, step is the total residence time average out to of fresh sludge in reactor drum 15 days 3., and first reaction zone and second reaction zone per half a day of spoil disposal once advance mud once, sludge volume with advance the mud amount be in the reactor drum mud total amount 1/30.
Above-mentioned reactor drum seals; Be divided into first reaction zone and second reaction zone in the reactor drum; Be separated by by dividing plate between two reaction zones; The height of dividing plate is lower than the height of the wall of reactor drum, and the periphery of reactor drum is wrapped in lagging material, and the mud of first reaction zone is transported to second reaction zone through the mud e Foerderanlage;
The mud of two reaction zones enters the top that mud Guan Jun is located at reaction zone; The top of second reaction zone also is provided with venting hole; Be connected with membrane treatment appts through pipeline, the bottom of two reaction zones is respectively equipped with blow-down pipe, and each blow-down pipe connects mechanical dewatering unit through a regulated valve;
The bottom of two reaction zones is equipped with the air aeration pipeline, and the air aeration pipe level is to placement, external gas blower; Also be provided with sludge return pipe in two reaction zones; Reaction zone top mud is extracted mouth out and is connected sludge reflux pump through a regulated valve; Get back in the reaction zone from the bottom of reaction zone from the sludge return pipe that sludge reflux pump picks out; To the mud jet segment of placing sludge return pipe, evenly offer mud jet hole on the mud jet segment pipe in the lower horizontal of reaction zone; Wherein the mud jet segment of sludge return pipe is above the air aeration pipeline;
The bottom of first reaction zone is the lay cycle waterpipe also, the external interchanger of circulating water pipeline, and wherein the air aeration pipeline is below circulating water pipeline.
The organic sludge that present method is handled comprises municipal sludge, the kitchen is surplus, discharge the poultry farming field organic waste, animals ight soil, also comprises liquid state organics.
Core of the present invention comprises following 2 points: one, limited aeration makes the anaerobic digestion of mud in the district rest on the acidication stage in first reaction zone; Because reactor drum has heat insulation facility; The heat that utilizes heat that the exothermic heat of reaction, refluxing and stirring mechanical energy of mikrobe transform and circulating water pipeline to carry is kept in the reaction zone temperature at 45 ℃～55 ℃; Carry out the acidifying of high temperature concurrent oxidation and aquoiysis; Preliminary conversion from larger molecular organics to intermediate products such as micromolecular organic acids that accomplish improves the biodegradability of hardly degraded organic substance and the part pathogenic bacteria is killed.Two, in second reaction zone, adopt air aeration; Facultative and aerobic thermophile bacteria aerobic sigestion becomes carbonic acid gas and water with micromolecular organic acid eventual degradation; Discharge a large amount of reaction heat, refluxing and stirring mechanical energy is converted into heat simultaneously, because reactor drum has heat insulation facility; Make system temperature maintain between 52 ℃～65 ℃, the pathogenic bacteria in the mud further is inactivated under 52 ℃～65 ℃ hot conditionss.
The present invention explains the acidifying of high temperature concurrent oxidation and aquoiysis as follows with the principle that high-temperature micro-aerobic digestion combines to accomplish the recovery of organic sludge resource:
Labile organic compound staple in the organic sludge is the materials such as mikrobe that retain in external source larger molecular organics, the mud.After mud got into reactor drum, the mikrobe in the mud will adapt to new environment, along with the prolongation of the residence time; The bacterial population structure changes, because reactor temperature is higher than external environment, and in continuous rising; Make that common mesophilic bacteria (Msophiles) is dead gradually in the mud, thermophile bacteria (Thermophiles) growth and breeding is preponderated gradually, and is carbon source with the mikrobe of death; The cell wall lysis of dead cell promptly takes place to dissolve born of the same parents' phenomenon in the secretion extracellular enzyme, and intracellular matter discharges; Form the volatile organic matter of The dissolved, also the external source larger molecular organics is resolved into micromolecular dissolved organism simultaneously; These dissolved volatile organic matters are continued to utilize by thermophilic bacterium then, carry out aerobic sigestion and discharge heat, because reactor drum has provision for thermal insulation, temperature of reactor rises gradually, the synthetic simultaneously new cell of thermophilic bacterium; After dead cell and available organism all are decomposed; Thermophilic bacterium carries out the endogenous respiration of self; Organism reduces gradually, and the heat of release is also fewer and feweri, and temperature of reaction descends; The recessive growth mode of this thermophile bacteria makes sludge reduction also finally reach stable, and the mud decrement effect of high temperature aerobic digestion reaches 30%～60%.
The present invention has positive effect: (1) can make mud reach stabilization, innoxious through the processing of this method, reduces organic content in the mud, kills pathogenic bacteria, eliminates the mud stink, dwindles sludge volume; Kept the nutrient of plant needs such as nitrogen a large amount of in the mud, phosphorus, potassium, can be used as fertilizer, or agricultural, reached the purpose of recycling sludge as the additive safety of improving the soil.(2) heat digestion unloading phase, made full use of the heat that discharges in the microbiological deterioration process with the operation phase and makes system's self-heating and keep high temperature, makes to need not external heat source in the entire treatment process, and aeration rate is low in reacting in addition, has reduced energy consumption.(3) the high temperature concurrent oxidation and aquoiysis acidifying of carrying out at first reaction zone has effectively improved the biodegradability of mud; The high-temperature micro-aerobic digestion series connection of first reaction zone and second reaction zone makes the processing efficiency of the hot digestive process of whole biological treatment improve.(4) temperature at the first reaction zone mud has reached 48～55 ℃, get into heat up behind second reaction zone very fast, thereby the foamy that has reduced by second reaction zone produces, assurance equipment normally carries out.(5) lower the temperature through interchanger earlier through the second reaction zone sludge discharged; The waste heat of discharging mud enters into first reaction zone through recirculated water; Mud transfer heat in first reaction zone; Alleviated the impact of temperature is lower in first reaction zone fresh sludge, not only helped the operation of system but also effectively utilized the energy the pond interior reaction temperature.(6) sludge quantity that the treatment capacity of the volume of reactor drum and mud can be designed to produce with middle-size and small-size waste water treatment plant in present method is suitable, thereby is applicable to the processing of middle-size and small-size waste water treatment plant mud by it this moment.
Description of drawings
Fig. 1 is a treatment system synoptic diagram of the present invention.
Fig. 2 is a process flow sheet of the present invention.
Mark in the above-mentioned accompanying drawing is following:
Second reaction zone 12, mud advance mud pipe 12-1, blow-down pipe 12-2, and sludge outlet 12-3, reflux line 12-4, air aeration pipeline 12-5, venting hole 12-6,
Dividing plate 13,
Concentrating unit 2,
Interchanger 3, circulating water pipeline 31,
Mechanical dehydration device 4,
Mud e Foerderanlage 5, mud output tube 51, mud input tube 52, transferpump 53,
Membrane treatment appts 6,
Steam piano 71, water circulating pump 72, the first sludge reflux pumps 73, the second sludge reflux pumps 74.
Embodiment
Be described further below in conjunction with the accompanying drawing specific embodiments of the invention.
(embodiment 1)
The method for recycling and processing organic sludge as resources of present embodiment is handled to be the mud of spring and autumn.
See Fig. 1; The organic sludge treatment system of present embodiment comprises reactor drum 1, concentrating unit 2, interchanger 3, mechanical dehydration device 4, mud e Foerderanlage 5, membrane treatment appts 6, steam piano 71, water circulating pump 72, first sludge reflux pump 73, second sludge reflux pump 74 and corresponding valve and pipeline, and wherein used concentrating unit 2 is concentration basins.
The mud of first reaction zone 11 enters the top that mud pipe 11-1 is located at first reaction zone 11, is provided with blow-down pipe 11-2 in the bottom of first reaction zone 11, and blow-down pipe 11-2 connects mechanical dewatering unit 4 through a regulated valve; The bottom of first reaction zone 11 is lay cycle waterpipe 31 also, circulating water pipeline 31 external interchanger 3 and water circulating pump 72; The bottom of first reaction zone 11 is provided with air aeration pipeline 11-4, and air aeration pipeline 11-4 level is to placement, external gas blower; First reaction zone 11 is provided with sludge return pipe 11-3; First reaction zone, 11 top mud are extracted mouth out through a regulated valve and pipe connection first sludge reflux pump 73; The sludge return pipe 11-3 that picks out from first sludge reflux pump 73 turns back in first reaction zone 11; To the mud jet segment that sludge return pipe 11-3 is set, evenly offer mud jet hole on the mud jet segment pipe in the lower horizontal of first reaction zone 11; Wherein the mud jet segment of sludge return pipe 11-3 is positioned at the top of circulating water pipeline 31, and circulating water pipeline 31 is positioned at the top of air aeration pipeline 11-4.
The mud of second reaction zone 12 enters the top that mud pipe 12-1 is located at second reaction zone 12,, the top of second reaction zone 12 also is provided with venting hole 12-6, and venting hole 12-6 is connected with membrane treatment appts 6 through pipeline; Be provided with blow-down pipe 12-2 in the bottom of second reaction zone 12, blow-down pipe 12-2 connects mechanical dewatering unit 4 through a regulated valve; The sludge outlet 12-3 of second reaction zone 12 opens the middle part at the above-below direction of cell wall; Sludge outlet 12-3 pipeline is connected to interchanger 3 through a regulated valve; These mud carry out round-robin recirculated water with a part of heat transferred between first reaction zone 11 and interchanger 3 in interchanger 3, come out the back through pipeline entering mechanical dehydration device 4 from interchanger 3; The bottom of second reaction zone 12 is provided with air aeration pipeline 12-5, and air aeration pipeline 12-5 level is to placement, external gas blower; Second reaction zone 12 is provided with sludge return pipe 12-4; Second reaction zone, 12 top mud are extracted mouth out through a regulated valve and pipe connection second sludge reflux pump 74; The sludge return pipe 12-4 that picks out from second sludge reflux pump 74 turns back in second reaction zone 12; To the mud jet segment that sludge return pipe 12-4 is set, evenly offer mud jet hole on the mud jet segment pipe in the lower horizontal of second reaction zone 12; Wherein the mud jet segment of sludge return pipe 12-4 is above air aeration pipeline 12-5.
To carry be that mud output tube 51, transferpump 53 and mud input tube 52 through mud e Foerderanlage 5 realized to mud between two reaction zones; Wherein the mud import of mud output tube 51 is positioned at the bottom of first reaction zone 11 of reactor drum 1, and the sludge outlet of mud input tube 52 is positioned at the bottom of second reaction zone 12.
See Fig. 1 and Fig. 2, the present embodiment method for recycling and processing organic sludge as resources may further comprise the steps:
1. mud concentrates.Through behind the gravity settling, solid content is 3%～5% to the mud of need handling in concentration basin 2, reach solid content and be 3%～10% advance the mud standard; Fresh sludge VSS/TSS (VSS/total suspended solid)=65%～72%, VSS concentration is 39～43g/L.
2. the startup of mud heat digestion in reactor drum 1.The mud that meets mud standard into that will be after concentrating unit 2 concentrates is through steam piano 71 first reaction zone 11 and second reaction zone 12 of suction reactor drums 1 respectively; After all filling, two reaction zones carry out aeration; And constantly mix, under the effect of mikrobe and stirring, temperature constantly rises in the reactor drum 1; In the time of the 6th day in the reactor drum 1 temperature rise to 49 ℃, accomplish hot digestion process the unloading phase.
3. the operation of mud heat digestion in reactor drum 1.This moment, whole organic sludge treatment system was in normal operating phase, and the operation scheme that is adopted is the semi continuous operation scheme.Wherein, the beginning of second reaction zone 12 is spoil disposals for the first time, and 1/8 mud of the second reaction zone TV of draining is promptly in the reactor drum 1 1/10 of the mud total amount; Open transferpump 53 behind the spoil disposal mud of first reaction zone 11 is added to second reaction zone 12, mend fullly up to second reaction zone 12, then fresh sludge is replenished full first reaction zones 11 from concentration basin 2; Second reaction zone 12 spoil disposal for the second time after one day, spoil disposal, the operation of advancing mud are the same; From the first time spoil disposal advance mud, first reaction zone 11 and second reaction zone spoil disposal 12 every day, advance mud once, sludge volume with advance the mud amount and be 1/10 of mud total amount in the reactor drum 1.
The heat digestion operation phase, the aeration rate of controlling first reaction zone 11 is 0.6m
3/ m
3H makes dissolved oxygen concentration between 0.01～0.1mg/L, thereby makes Anaerobic processes rest on the acidication stage, and its ORP (redox potential) value is 450mv～330mv, and controlling the mud quantity of reflux simultaneously is 3.6m
3(mud)/m
3(reactor drum) h, the mixed tensor that makes the reaction zone 11 of winning is 500W/m
3(reactor drum) (mixed tensor is meant devices such as treatment system unlatching sludge reflux pump and gas blower, the average power consumption of every cubic metre of volume in the reactor drum); In this process, the temperature in first reaction zone 11 is between 48 ℃～54 ℃.The aeration rate of control second reaction zone 12 is 0.8m in second reaction zone 12
3/ m
3H～1.4m
3/ m
3H makes that dissolved oxygen concentration is 0.1～0.5mg/L, and its aeration rate a few days ago is 1.2m
3/ m
3H～1.4m
3/ m
3H, the 3rd, the 4th day is 1.0m
3/ m
3H～1.2m
3/ m
3H is controlled at 0.8m at last
3/ m
3H～1.0m
3/ m
3H, its ORP (redox potential) value is 350mv～36mv, controlling the mud quantity of reflux simultaneously is 4.8m
3(mud)/m
3(reactor drum) h makes that the mixed tensor of second reaction zone 12 is 600W/m
3(reactor drum); In this process, temperature is between 55 ℃～62 ℃ in second reaction zone 12, and mud carries out high-temperature micro-aerobic digestion.
This shows, for fresh sludge, the total residence time average out to of mud in reactor drum 1 10 days, the average stop 2 days in first reaction zone 11, the average stop 8 days in second reaction zone 12.Normal operating phase be divided into into during the mud spoil disposal with two of run durations during.Reflux pump 73,74 with two reaction zones when advancing mud and spoil disposal stops and aeration is stopped; After treating that into mud and spoil disposal finish, again the sludge reflux pump 73,74 and the aerating apparatus of first reaction zone 11 and second reaction zone 12 are opened again.
4. lower the temperature through interchanger 3 earlier through second reaction zone, 12 sludge discharged, the waste heat of discharging mud carries out heat exchange by recirculated water through the mud in the circulating water pipeline 31 and first reaction zone 11 and is transported to first reaction zone 11.
5. after second reaction zone, 12 sludge discharged are lowered the temperature in interchanger 3; Be admitted to mechanical dehydration device 4 and make further mechanical dehydration, process mud cake outward transport and handle, and the waste water behind the digested sludge mechanical dehydration is sent to the purification tank for liquid waste of sewage work and is for further processing.
Through detecting, the VSS clearance of discharging mud reaches more than 40%, and pathogenic bacteria such as colibacillus of excrement and streptococcus faecium be not for detecting, and Salmonellas is lower than 3/4gTS (annotate: TS is meant total suspended solid).
Above-mentioned steps 3. in; Because sludge reflux pump 73,74 and aerating apparatus all stop when advancing the mud spoil disposal; Thereby at this moment there is not mud to stir; And the mud import of mud output tube 51 is positioned at the bottom of first reaction zone 11, and therefore the mud of second reaction zone 12 that is transported to is on average to stop 2 days mud at first reaction zone 11, rather than has just got into the mud of first reaction zone 11.
Above-mentioned steps 4. in, the waste heat of second reaction zone 12 mud that discharges is sent into first reaction zone 11 through the recirculated water in the circulating water pipeline 31, transfer heat in first reaction zone 11 promptly helps technological operation and has effectively utilized the energy again; Because first reaction zone 11 is admitted the lower fresh sludge of temperature; The mud that gets into has impact to district's interior reaction temperature; And be transported to first reaction zone 11 through the waste heat that interchanger 3 and circulating water pipeline 31 will discharge mud by recirculated water; Increase the heat in first reaction zone 11, improved the temperature buffer ability of first reaction zone 11.
Above-mentioned steps 3. in; Temperature in first reaction zone 11 is 48 ℃～54 ℃; In first reaction zone 11 amphimicrobe with mud in larger molecular organics such as glucide, protein, fat etc. be decomposed into micromolecular organic acid such as materials such as acetate, propionic acid, effectively improved the biodegradability of mud; Cell takes place to dissolve born of the same parents' phenomenon simultaneously, and the intracellular matter stripping is in solution, and the part pathogenic bacteria is killed.Temperature in second reaction zone 12 is 55 ℃～62 ℃; Facultative and aerobic thermophile bacteria becomes carbonic acid gas and water with micromolecular organic acid eventual degradation during this; Discharge a large amount of reaction heat simultaneously; Make and keep high temperature in the reaction zone, the pathogenic bacteria in the mud further is inactivated under 55 ℃～62 ℃ hot conditions.
The foul smell that produces in the entire treatment process is got rid of from venting hole 12-6, gets into just to enter atmosphere after membrane treatment appts 6 is handled.
Through aforesaid method, with unsettled organic matter removal, pathogen reduction in the mud, digestion back mud is rich in nutritive substances such as nitrogen, phosphorus simultaneously, through directly outward transport is agricultural behind the mechanical dehydration generation mud cake, has realized the organic sludge as resources recovery.
(embodiment 2)
Present embodiment is handled to be the mud in summer, and the waste water that enters Sewage Plant summer is low than the COD in other seasons, causes sludge quantity few.The difference of the treatment system of used treatment system and embodiment 1 is that employed concentrating unit 2 is centrifugal dehumidifiers, and method that is adopted and embodiment 1 are basic identical, and difference is:
Heat digestion run duration, the aeration rate of controlling first reaction zone 11 is 1.0m
3/ m
3H, thus make Anaerobic processes rest on the acidication stage, its ORP (redox potential) value is 480mv～370mv, controlling the mud quantity of reflux simultaneously is 3.6m
3(mud)/m
3(reactor drum) h, the mixed tensor that makes the reaction zone 11 of winning is 500W/m
3(reactor drum); In this process, the temperature in first reaction zone 11 is between 45 ℃～52 ℃.The aeration rate of control second reaction zone 12 is 1.0m in second reaction zone 12
3/ m
3H～1.5m
3/ m
3H, first three sky of its aeration rate is 1.2m
3/ m
3H～1.5m
3/ m
3H is controlled at 1.0m at last
3/ m
3H～1.2m
3/ m
3H, its ORP (redox potential) value is 380mv～25mv, controlling the mud quantity of reflux simultaneously is 4.8m
3(mud)/m
3(reactor drum) h makes that the mixed tensor of second reaction zone 12 is 600W/m
3(reactor drum); In this process, temperature is between 55 ℃～59 ℃ in second reaction zone 12, and mud carries out high-temperature micro-aerobic digestion.
Through detecting, the VSS clearance of discharging mud reaches more than 40%, and pathogenic bacteria such as colibacillus of excrement and streptococcus faecium be not for detecting, and Salmonellas is lower than 3/4gTS.
(embodiment 3)
Present embodiment is handled to be the mud in winter, and the difference of the treatment system of used treatment system and embodiment 1 is that employed concentrating unit 2 is centrifugal dehumidifiers, and method that is adopted and embodiment 1 are basic identical, and difference is:
Step 2. in, carry out aeration after two reaction zones are all filled, and constantly mix; Under the effect of mikrobe and stirring, temperature constantly rises in the reactor drum 1, and reactor drum 1 interior temperature rises to 45 ℃ during by the 5th day; No longer rose in the 6th day, and opened the valve at blow-down pipe 12-2 place of blow-down pipe 11-2 and second reaction zone of first reaction zone, under the effect of gravity; Two reaction zones all discharge the mud of 2/3 left and right sides volume, and this part sludge discharged is handled the back outward transport through mechanical dehydration device 4; In reaction zone, replenish then with volume mud, aeration also constantly mixes, and temperature control rises to 49 ℃ in the reactor drum 1 in the time of 10 days, accomplish hot digestion process the unloading phase.
Run duration, the aeration rate of controlling first reaction zone 11 is 0.5～0.6m
3/ m
3H, thus make Anaerobic processes rest on the acidication stage, its ORP (redox potential) value is 520mv～410mv, controlling the mud quantity of reflux simultaneously is 3.6m
3(mud)/m
3(reactor drum) h, the mixed tensor that makes the reaction zone 11 of winning is 500W/m
3(reactor drum); In this process, the temperature in first reaction zone 11 is between 45 ℃～50 ℃.The aeration rate of control second reaction zone 12 is 0.6m in second reaction zone 12
3/ m
3H～1.4m
3/ m
3H, first three sky of its aeration rate is 1.0m
3/ m
3H～1.4m
3/ m
3H, back three days is 0.8m
3/ m
3H～1.0m
3/ m
3H is controlled at 0.6 m at last
3/ m
3H, its ORP (redox potential) value is 410mv～10mv, controlling the mud quantity of reflux simultaneously is 4.8m
3(mud)/m
3(reactor drum) h makes that the mixed tensor of second reaction zone 12 is 600～700W/m
3(reactor drum); In this process, temperature is between 52 ℃～58 ℃ in second reaction zone 12, and mud carries out high-temperature micro-aerobic digestion.
Through detecting, the VSS clearance of discharging mud reaches more than 40%, and pathogenic bacteria such as colibacillus of excrement and streptococcus faecium be not for detecting, and Salmonellas is lower than 3/gTS.
Claims (9)
1. method for recycling and processing organic sludge as resources; It is characterized in that: the treatment system that is adopted comprises concentrating unit (2), reactor drum (1), interchanger (3) and mechanical dehydration device (4); Wherein reactor drum (1) comprises first reaction zone (11) and second reaction zone (12), and the volume of second reaction zone (12) is 1.5～4 times of first reaction zone (11) volumetrical; This method may further comprise the steps:
1. mud concentrates in concentrating unit (2): concentrate back mud meet solid content be 3%～10% advance the mud standard;
2. the startup of organic sludge heat digestion in reactor drum (1): thickened sludge is through first reaction zone (11) and second reaction zone (12) of steam piano (71) difference suction reactor drum (1); After all filling, two reaction zones carry out aeration; And constantly mix; Under the effect of mikrobe and stirring, the interior temperature of reactor drum (1) constantly rises, and accomplishes the startup of heat digestion when being warming up to 48 ℃～52 ℃; When the interior temperature of reactor drum (1) does not reach 48 ℃ situation if occurrence temperature no longer rises; Then discharge the mud of 1/3～2/3 volumes at two reaction zones; And then replenish with volume mud; Carry out aeration, and constantly mix, in two reaction zones temperature under the effect of mikrobe and stirring all from being warming up to 48 ℃～52 ℃;
3. the operation of organic sludge heat digestion in reactor drum (1): this moment, whole organic sludge treatment system was in normal operating phase, and the operation scheme that is adopted is the semi continuous operation scheme; Wherein, second reaction zone (12) is spoil disposal for the first time, 3%～20% mud of the second reaction zone TV of draining; Open transferpump (53) behind the spoil disposal mud of first reaction zone (11) is added to second reaction zone (12), mend fullly up to second reaction zone (12), then fresh sludge is replenished full first reaction zone (11) from concentrating unit (2); Second reaction zone (12) spoil disposal for the second time after half a day to one day; Spoil disposal, the operation of advancing mud are the same, and first reaction zone (11) limited aeration, and thickened sludge carries out the acidifying of high temperature concurrent oxidation and aquoiysis in first reaction zone (11); The interior temperature of first reaction zone (11) is between 45 ℃～55 ℃; Second reaction zone (12) adopts air aeration, and thickened sludge carries out high-temperature micro-aerobic digestion in second reaction zone (12), and the interior temperature of second reaction zone (12) is between 52 ℃～65 ℃; The normal operating phase branch advances mud spoil disposal phase and two phases of operating period; Reflux pump (73,74) with two reaction zones when advancing the mud spoil disposal stops and aeration is stopped; After advancing the end of mud and spoil disposal, again the sludge reflux pump (73,74) and the aerating apparatus of first reaction zone (11) and second reaction zone (12) are opened again;
4. 3. step is lowered the temperature through interchanger (3) through the digested sludge that second reaction zone (12) discharges, the waste heat of discharging mud carries out heat exchange through circulating water pipeline (31) with the interior mud of first reaction zone (11) by recirculated water and is transported to first reaction zone (11);
5. mechanical dehydration device (4) is sent in the digested sludge after 4. step being lowered the temperature, and carries out mechanical dehydration, and processes the mud cake outward transport.
2. method for recycling and processing organic sludge as resources according to claim 1; It is characterized in that: the treatment system of present method also comprises membrane treatment appts (6), and the foul smell that 3. 2. step produce in the treating processes with step gets into and enters atmosphere again after membrane treatment appts (6) is handled.
3. method for recycling and processing organic sludge as resources according to claim 1 is characterized in that: said first reaction zone (11) limited aeration makes that dissolved oxygen concentration is 0.01～0.1mg/L; Second reaction zone (12) adopts air aeration, makes that dissolved oxygen concentration is 0.1～0.5mg/L.
4. method for recycling and processing organic sludge as resources according to claim 1; It is characterized in that: the mean residence time of organic sludge in first reaction zone (11) is shorter; Mean residence time in second reaction zone (12) is longer, and is 1.5～4 times at first reaction zone (11) at the mean residence time of second reaction zone (12).
5. method for recycling and processing organic sludge as resources according to claim 1 is characterized in that: be higher than 3% mud for solid content, need do not concentrate and can directly get into reactor drum (1).
6. method for recycling and processing organic sludge as resources according to claim 1; It is characterized in that: the mud of handling spring and autumn; Step is the total residence time average out to of fresh sludge in reactor drum (1) 10 days 3.; First reaction zone (11) and second reaction zone (12) spoil disposal every day once advance mud once, and sludge volume is 1/10 of the middle mud total amount of reactor drum (1) with advancing the mud amount.
7. method for recycling and processing organic sludge as resources according to claim 1; It is characterized in that: the mud of handling summer; Step is the total residence time average out to of fresh sludge in reactor drum (1) 12 days 3.; First reaction zone (11) and second reaction zone (12) spoil disposal every day once advance mud once, and sludge volume is 1/12 of the middle mud total amount of reactor drum (1) with advancing the mud amount.
8. method for recycling and processing organic sludge as resources according to claim 1; It is characterized in that: the mud of handling winter; Step is the total residence time average out to of fresh sludge in reactor drum (1) 15 days 3.; First reaction zone (11) and second reaction zone (12) per half a day of spoil disposal once advance mud once, and sludge volume is 1/30 of the middle mud total amount of reactor drum (1) with advancing the mud amount.
9. method for recycling and processing organic sludge as resources according to claim 2; It is characterized in that: the reactor drum of present method (1) seals; Be divided into first reaction zone (11) and second reaction zone (12) in the reactor drum (1); Be separated by by dividing plate (13) between two reaction zones; The height of dividing plate (13) is lower than the height of the wall of reactor drum (1), and the periphery of reactor drum (1) is wrapped in lagging material, and the mud of first reaction zone (11) is transported to second reaction zone (12) through mud e Foerderanlage (5);
The mud of two reaction zones enters the top that mud Guan Jun is opened in reaction zone; The top of second reaction zone (12) also is provided with venting hole (12-6); Be connected with membrane treatment appts (6) through pipeline; The bottom of two reaction zones is respectively equipped with blow-down pipe, and each blow-down pipe connects mechanical dewatering unit (4) through a regulated valve;
The bottom of two reaction zones is equipped with the air aeration pipeline, and the air aeration pipe level is to placement, external gas blower; Also be provided with sludge return pipe in two reaction zones; Reaction zone top mud is extracted mouth out through a regulated valve and pipe connection sludge reflux pump; Get back in the reaction zone from the bottom of reaction zone from the sludge return pipe that sludge reflux pump picks out; To the mud jet segment that sludge return pipe is set, evenly offer mud jet hole on the mud jet segment pipe in the lower horizontal of reaction zone; Wherein the mud jet segment of sludge return pipe is above the air aeration pipeline;
The bottom of first reaction zone (11) is lay cycle waterpipe (31) also, the external interchanger of circulating water pipeline (31) (3), and wherein air aeration pipeline (11-4) is in the below of circulating water pipeline (31).
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| CN103803774B (en) * | 2014-02-26 | 2015-05-20 | 江苏理工学院 | Sludge concentration device and sludge treatment method thereof |
| CN105110590A (en) * | 2015-09-17 | 2015-12-02 | 昆明滇池水务股份有限公司 | Method and device for intensifying high-temperature hydrolysis acidification of excess sludge from sewage treatment plant through aeration |
| CN105948234B (en) * | 2016-06-27 | 2018-01-23 | 郑州大学 | A kind of method of resource of phosphorous aerobic particle mud |
| CN106587555A (en) * | 2016-12-22 | 2017-04-26 | 长沙奥邦环保实业有限公司 | Sewage sludge treatment device |
| CN107140798A (en) * | 2017-04-26 | 2017-09-08 | 天津壹新环保工程有限公司 | A kind of online abatement system of sludge and processing method |
| CN107055994B (en) * | 2017-05-26 | 2023-06-27 | 江苏海洋大学 | Efficient recycling treatment device for excess sludge |
| CN107935331B (en) * | 2017-11-01 | 2019-08-06 | 南京师范大学 | A kind of Opsonizing method of materialized mud flocculation structure |
| CN110252781A (en) * | 2019-07-26 | 2019-09-20 | 郑州同济环保工程有限公司 | Rubbish three phase separation treatment process |
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