CN105366898A - Sludge anaerobic digestion-high dryness dehydration method used for achieving adjustable high solid content based on double membrane system synchronous dehydration - Google Patents
Sludge anaerobic digestion-high dryness dehydration method used for achieving adjustable high solid content based on double membrane system synchronous dehydration Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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Abstract
The invention discloses a sludge anaerobic digestion-high dryness dehydration method used for achieving adjustable high solid content based on double membrane system synchronous dehydration. A device of the sludge anaerobic digestion-high dryness dehydration method comprises a sludge anaerobic digestion reaction unit, a forward osmosis solid content adjusting unit, a membrane distillation draw solution concentrating unit, and a post-digestion high dryness dehydration unit. According to the sludge anaerobic digestion-high dryness dehydration method, the forward osmosis solid content adjusting unit is used for realizing sludge dehydration when sludge anaerobic digestion is carried out, so that solid content can be adjusted in sludge anaerobic digestion process, sludge anaerobic digestion process is promoted, problems that sludge water content is high and solid content is low, and digestion reactors is large in size and low in digestion efficiency are solved effectively, sludge volume is reduced, and at the same time sludge anaerobic digestion efficiency is increased. At the same time, forward osmosis high dryness dehydration technology is adopted, so that super low energy consumption quantitative reduction of sludge is realized finally. All the forward osmosis draw solution is concentrated and recycled using the membrane distillation draw solution concentrating unit, and full utilization of the temperature of anaerobic digestion solution is realized in the process.
Description
Technical field
The invention belongs to technical field of sludge treatment.
Background technology
In recent years, along with the increase of sewage load, the output of excess sludge grows with each passing day, and therefore, the process disposal of excess sludge and resource reclaim is become to the focus of research.
Anaerobic sludge digestion technique can realize the stabilization of excess sludge, and the form of all right combustible gas reclaims the energy, therefore can play a significant role in municipal sludge process is disposed.But, cause conventional anaerobic sludge digestion technique to build up the reason that rate is low, operation ratio is lower and mainly comprise two aspects: one is that feed sludge water ratio is high, two is that the factor of created gase of anaerobic digestion is low, cause anaerobic digestion facility volume large, overall investment is large, and energy consumption is high needed for huge system heating and thermal insulation, the energy recovery advantage of anaerobic digestion is not obvious, and process economy is not high.Sludge biogas production rate is by the impact of many factors, and one of them important factor is the total solids level (i.e. solid content) of feed sludge.Therefore, the solid content of feed sludge is and the important parameter that anaerobic digestion process entirety is invested and performance driving economy is all relevant.Improve mud solid content, required reactor volume will significantly reduce, and maintain the energy consumption also corresponding minimizing needed for temperature of reaction, thus can save investment in fixed assets and working cost etc.
But the high solid content of mud may produce some adverse influences at pretreatment stage, simultaneously, high solid content mud also can be with the problem of serving in anaerobic digestion initial reaction stage: (1) response matrix concentration is high, cause reaction intermediate and energy to transmit in media as well, spread difficulty, easily form feedback inhibition; (2) moisture content is low, affects signaling or enzyme diffusion, increases and start difficulty; (3) stir resistance large, energy consumption is high.The first two problem can cause the reaction times to extend, thus the advantage that the reactor volume that partial offset mud height solid content brings reduces.In addition, agitating unit affects the very crucial part of factor of created gase in anaerobic digestion process, also be maximum step that consumes energy simultaneously, its power consumption accounts for whole biogas engineering and runs power consumption about 50%, stirs the process economics sexual clorminance of the soaring also possibility partial offset height solid content anaerobic sludge digestion of energy consumption.Beijing Inst. of Civil Engineering & Arch Cao Xiu qin etc. utilizes the result of study of pilot scale to prove, even solid content is elevated to 10% from 8%, reach identical mixed effect, stirring intensity also needs significantly to increase.
Patent NO.201010504997.6 proposes a kind of high concentration sludge Anaerobic Digestion technique of mud being carried out to mechanical dewatering, reduce the volume of anaerobic sludge digestion reactor, improve the organic loading of mud, but at the initial stage mud solid content of anaerobic reaction up to more than 10%, startup for anaerobic reaction is disadvantageous, and the rising of solid content simultaneously also makes to stir power consumption to be increased greatly.
Start with reaction and compare with the initial charge stage, along with the carrying out of high solid content anaerobic sludge digestion reaction, the rheological property of mud can improve, and viscosity can reduce, thus the problems such as stirring energy consumption, mass transfer, transmission ofenergy are improved.Therefore, high solid content mud may can not cause to run difficulty or stir energy consumption in the middle and later periods that anaerobic digestion is reacted and raise.As can be seen here, the Reasonable Regulation And Control how realizing solid content in anaerobic digestion reaction vessel Start-up and operating performance process (namely controls solid content in initial reaction stage or charging stage lower, to reach good stirring/mass-transfer performance, and in the reaction the later stage or reactor end mud rheological property better time improve solid content to realize high volumetric loading and good process economy), be the key overcoming above-mentioned variety of problems.
Regulation and control solid content realizes by being separated with solid retention time (SRT) by hydraulic detention time (HRT).For anaerobic digestion reaction, HRT and SRT is divided out, the advantage of the aspects such as organic removal rate lifting can be brought.Traditional anaerobic sludge digestion generally carries out in complete (CSTR), cannot realize separating of HRT and SRT.Patent NO.201010623418.X discloses a kind of separation and the biomass high solid anaerobic digestion process of returnedactivatedsludge, adopt and being separated of HRT and SRT is achieved to the centrifugal mode then refluxed of anaerobic digester system discharging mud, but centrifugal consumed energy is comparatively large, and the mode of backflow is unfavorable for more greatly the carrying out of stable anaerobic digestion reaction for the Organic loading shock of Digestive tract.
Meabe etc. use the anaerobic membrane bioreactor of ultra-filtration membrane that HRT and the SRT of anaerobic digestion process can be made to divide out, but test-results display, this kind of reactor can not realize high solid content anaerobic sludge digestion truly.When feed sludge solid content 2%, 2 months stable after, in high temperature and middle temperature reactor, mud solid content all only maintains about 7%.Mud solid content raises and pressure-actuated ultra-filtration membrane fouling membrane may be caused to worsen further.The flux using the film of ultra-filtration membrane-anaerobic sludge digestion process stabilizing to run is low, and energy consumption is large, and the running cost that mould material cleaning or replacing bring is corresponding higher.
The high pollution performance of anaerobic digestion solution to porous-film is the major cause causing the failure of ultra-filtration membrane technique.On the other hand, Holloway etc. utilize and are just permeating the dehydration liquid of (Forwardosmosis, FO) technique to mud after anaerobic digestion when carrying out concentrated, forward osmosis membrane (dense film, non-pressure drives) pollution situation want light many, and be substantially reversible membrane fouling.
Just permeating and referring under the driving of selectivity through film both sides permeable pressure head, water flows to the spontaneous phenomenon of higher side from the lower side of osmotic pressure.FO technique is by FO film unit and draw liquid regeneration unit and form.At FO film unit, tool high osmotic pressure draw liquid and pending solution forms permeable pressure head in permeable membrane both sides, water draws liquid from entering after pending solution diffusion crosses permeable membrane.The liquid that draws after dilution is transported to reconcentration unit, draws liquid here and is separated with water, and the liquid that draws after concentrated is recycled back into FO unit.Although namely there was FO to be applied to the concentrated of trade effluent before nearly 40 years, but the problems such as the performance being limited to forward osmosis mould material and the sharp energy consumption of efficiency drawing liquid regeneration, until just become the study hotspot of the aspect such as desalination, sewage disposal for 2005 gradually later.End 2015, along with the progress of mould material, investigator has carried out the feasibility study that FO technique is applied at multiple fields.
Membrane distillation (Membranedistillation, MD) is the one in current emerging membrane separation technique, is to utilize the steam pressure difference of hydrophobic microporous membrane both sides as the process of a kind of membrane sepn of mass transfer force.Its principle is, when the former aqueous solution that temperature is higher flows through one side of microporous hydrophobic membrane, because film has hydrophobic performance, the former aqueous solution is not by fenestra, but because the water vapor pressure on the high former aqueous solution on hot-fluid side of temperature and the interface of film is higher than the other side, water vapor can by fenestra from enter other while, and then condensation can be carried out by cold-side fluid, this completes and pure water be have also been obtained to the concentrated of former water simultaneously.
Summary of the invention
The present invention aims to provide a kind of device and method of the anaerobic sludge digestion-high level cadre's dewatering process realizing adjustable high solid content that synchronously dewaters based on two membranous system, and the of the present invention pair of membranous system mainly comprises and just permeating solid content regulon and membrane distillation draws liquid upgrading unit.Excess sludge after concentrated enters after pretreatment and just permeates anaerobic digestion reaction vessel, by FO-MD combination technique, portion of water is removed in reaction system in reaction process, digested sludge after thickening enters sludge high-drying dewatering unit after next step digestion, by dilute draw liquid membrane distillation draw liquid upgrading unit carry out concentrated after be again transported to just permeating solid content regulon or digestion after sludge high-drying dewatering unit.
Device of the present invention is the sludge aerobic digestion device just permeating coupled film distillation, mainly comprises anaerobic sludge digestion reaction member, just permeates solid content regulon, membrane distillation draws liquid upgrading unit and sludge high-drying dewatering unit after digestion.Anaerobic sludge digestion reaction member with just to permeate solid content regulon and formed by forward osmosis membrane and just permeate anaerobic digestion reaction vessel.The former is connected with pipeline by valve with sludge high-drying dewatering unit after digestion.Just permeating solid content regulon, the rear sludge high-drying dewatering unit of digestion is being drawn liquid upgrading unit with membrane distillation and is being connected with pipeline by valve.Whole system is containing, for example lower component:
Primary sludge pond 1: for storing excess sludge and carrying out pre-concentration to it;
Just permeating anaerobic digestion reaction vessel 2: for the anaerobic reaction also synchronous dehydration of mud;
Membrane component 3: draw the concentrated of liquid for aligning infiltration;
Membrane distillation drives liquid constant temperature circulating groove 4: for the clear water produced in storage films still-process;
High level cadre dewaters positive permeable reactive device 5: for dewatering further to the mud after anaerobic digestion;
Primary sludge pump 6: for primary sludge being pumped into the sludge sump just permeating sludge anaerobic reactor 2;
Just permeating and drawing liquid recycle pump 7: for entering membrane component concentrate by the liquid pump that draws diluted;
Membrane distillation drives liquid recycle pump 8: for the driving liquid pump of membrane distillation is entered clean water basin;
Liquid recycle pump 9 is drawn in high level cadre's dehydration: for entering membrane component concentrate by the liquid pump that draws diluted;
Gas collector 10: for collecting the gas that anaerobic digestion reaction produces.
Method of the present invention is, be a kind of method of the anaerobic sludge digestion-high level cadre's dehydration utilizing two membranous system synchronously to dewater to realize adjustable high solid content, key step and principle of work are:
(1) excess sludge 10 discharge of sewage work enters in primary sludge pond 1 and carries out after pre-concentration reaches certain solid content, then pumps into by primary sludge pump 6 sludge sump just permeating anaerobic reactor and carry out anaerobic digestion.In the process, by forward osmosis membrane technique, moisture is discharged system outward, thus reach the object improving solid content.Carry out the stirring of some strength in anaerobic sludge digestion process, the effect of stirring mainly makes functional microorganism and matrix have sufficient touch opportunity, and to make in whole system solid content even, is beneficial to the membrane flux that maintains forward osmosis membrane a relatively high level.
(2) enter high level cadre through the excess sludge of anaerobic digestion by pipeline, Valved discharge to dewater the sludge sump of positive permeable reactive device 5, direct thickening is completed further by forward osmosis membrane technique in this unit, moisture percentage in sewage sludge reaches less than 60%, can carry out final disposal after the discharge of high level cadre's dewatered sludge;
(3) liquid that draws just permeated in anaerobic digestion reaction vessel 1 is diluted just permeating concentration in solid content regulon, draw liquid recycle pump 7 and pump into by just to permeate the hot side that membrane distillation draws liquid upgrading unit after flowing out from this unit, in this unit, draw the driving of liquid due to temperature head, moisture evaporation becomes gas by entering after cold side condensation liquefy water again after the transmission of the micropore of porous hydrophobic membrane.In this process, draw liquid and obtain and again concentrate, concentration raises, be then circulated back under hydraulic pressure effect just permeate anaerobic digestion reaction vessel 1 draw liquid pool recycling;
(4) clear water that membrane distillation draws cold side in membrane component 3 in liquid upgrading unit drives liquid recycle pump 8 to pump into membrane distillation by membrane distillation and drives liquid constant temperature circulating groove 4, and part, as reuse water reuse, is partially recycled to membrane component cold side.
(5) liquid concentration in high level cadre dewaters positive permeation unit of drawing that high level cadre dewaters in positive permeable reactive device 5 is diluted, draw by high level cadre's dehydration the hot side that liquid recycle pump 9 pumps into membrane component 3 after flowing out from this unit, in this unit, draw the driving of liquid due to temperature head, moisture evaporation becomes gas by entering after cold side condensation liquefy water again after the transmission of the micropore of porous hydrophobic membrane.In this process, draw liquid and obtain and again concentrate, concentration raises, and what under hydraulic pressure effect, be then circulated back to that high level cadre dewaters positive permeable reactive device 5 draws liquid pool recycling.
The invention has the beneficial effects as follows:
(1) water ratio of feed sludge is higher, and solid content is lower, and starting speed to anaerobic digestion reaction does not affect, and reaction intermediate and energy also can not be caused because transmitting, diffusion is difficult and form feedback inhibition;
(2) along with reaction is carried out, in reactor, the solid content of feed liquid rises, thus significantly improves volumetric loading and volume yield rate:
(3) the removing of excessive moisture in system, makes follow-up heat input demand and reduces, improve process economy;
(4), compared with solid content anaerobic sludge digestion process low with tradition, reinforcing process has no significant effect stirring energy consumption;
(5) FO fouling membrane is light, and is reversible membrane fouling substantially, process runs well;
(6) FO technique draw liquid be concentrated by membrane distillation realize, the heat of anaerobic digestion solution can be made full use of, without additional energy;
(7), compared with being back to sewage treatment unit with dehydration filtrate in conventional anaerobic digestion-dewatering process, this technique Digestive system water outlet after treatment can direct reuse, to the zero load increase of sewage treatment unit;
(8) apparatus structure of this technique is compact, and floor space is little, and operational management is convenient, simple to operate.
Accompanying drawing explanation
Accompanying drawing 1 is the process flow sheet of device in the present invention.
In figure: 1; Primary sludge pond; 2: just permeate anaerobic digestion reaction vessel; 3: membrane component; 4: membrane distillation drives liquid constant temperature circulating groove; 5: high level cadre dewaters positive permeable reactive device; 6: primary sludge pump; 7: just permeating and drawing liquid recycle pump; 8: membrane distillation drives liquid recycle pump; 9: liquid recycle pump is drawn in high level cadre's dehydration; 10: gas collector; 11: valve one; 12: valve two; 13: valve three; 14: valve four
Embodiment
Specific embodiments of the present invention is described in detail with reference to the accompanying drawings.
As shown in Figure 1, a kind ofly primary sludge pond 1 is comprised based on two membranous system anaerobic sludge digestion-high level cadre's dewatering process device realizing adjustable high solid content that synchronously dewaters: for storing excess sludge and carrying out pre-concentration to it; Just permeating anaerobic digestion reaction vessel 2: for the anaerobic reaction also synchronous dehydration of mud; Membrane component 3: draw the concentrated of liquid for aligning infiltration; Membrane distillation drives liquid constant temperature circulating groove 4: for the clear water produced in storage films still-process; High level cadre dewaters positive permeable reactive device 5: for dewatering further to the mud after anaerobic digestion; Primary sludge pump 6: for primary sludge being pumped into the sludge sump just permeating sludge anaerobic reactor 2; Just permeating and drawing liquid recycle pump 7: for entering membrane component concentrate by the liquid pump that draws diluted; Membrane distillation drives liquid recycle pump 8: for the driving liquid pump of membrane distillation is entered clean water basin; Liquid recycle pump 9 is drawn in high level cadre's dehydration: for entering membrane component concentrate by the liquid pump that draws diluted; Gas collector 10: for collecting the gas that anaerobic digestion reaction produces.
The excess sludge of sewage work directly delivers into primary sludge pond 1 by pipeline.In primary sludge pond 1, carry out the preliminary concentrated water ratio that makes by action of gravity be reduced to 97% ~ 98%, then entered by primary sludge pump delivery and just permeate anaerobic digestion reaction vessel 2, adopt intermittent feeding to enter a mud in every 24 hours.Just permeating anaerobic digestion reaction vessel to be heated by nichrome wire, and the thermometer measure temperature of just permeating sludge anaerobic reactor is put in utilization simultaneously, temperature-control range is 30 ~ 55 DEG C; Adopt stirrer to carry out intermittent stirring, stirring intensity makes corresponding adjustment according to the change of mud solid content; The pH of Simultaneously test mud, carries out debugging according to measurement result to the potential of hydrogen of mud and anaerobic reaction is carried out smoothly.
The shape of just permeating anaerobic digestion reaction vessel sludge sump is rectangular parallelepiped, one side by forward osmosis membrane with draw liquid side and be connected.In the specific implementation, the form of just permeating anaerobic digestion membrane module comprises board-like, rolling, hollow fiber form or tubular type, described forward osmosis membrane assembly runs for one or more groups simultaneously, the described separating layer of just permeating the forward osmosis membrane material of anaerobic digestion reaction vessel and support layer material are organic polymer, its separating layer include but not limited to cellulose acetate, cellulosetri-acetate, polymeric amide and with these materials for skeleton adds the permeable membrane material that other micro substances are formed, its supporting layer includes but not limited to polysulfones, polyethersulfone etc.; Described is 150,000 ~ 250 as just permeating the conductivity range drawing liquid, and 000 μm/cm deviates from moisture gradually and makes the water ratio range stabilises of anaerobically digested sludge 92% ~ 96% under the effect of drawing liquid osmotic pressure from mud.
The gas that anaerobic reaction produces by with just permeate the gas collector 10 that anaerobic digestion reaction vessel 2 is connected and collect, and be equipped with flow monitoring parts gas yield detected.The change simultaneously carrying out regularly sampling observation water ratio to the mud in anaerobic digestion reaction vessel correspondingly regulates the concentration of drawing liquid and enters mud amount every day, an every 60 days rows mud.The mud discharging mouth just permeating sludge anaerobic reactor 2 is connected by the dewater opening for feed of positive permeable reactive device 5 of pipeline and valve and the high level cadre of sludge high-drying dewatering unit after digestion.By action of gravity, mud is delivered into high level cadre to dewater in positive permeable reactive device 5.
The dewater shape of positive permeable reactive device of high level cadre is rectangular parallelepiped, one side by forward osmosis membrane with draw liquid side and be connected.In the specific implementation, the form of just permeating high level cadre's dehydrated film assembly comprises board-like, rolling, hollow fiber form or tubular type; The dewater separating layer of forward osmosis membrane material of positive permeable reactive device 5 and support layer material of described high level cadre is organic polymer, its separating layer include but not limited to cellulose acetate, cellulosetri-acetate, polymeric amide and with these materials for skeleton adds the permeable membrane material that other micro substances are formed, its supporting layer includes but not limited to polysulfones, polyethersulfone etc.; Described is 200,000 ~ 300 as just permeating the conductivity range drawing liquid, 000 μm/cm.Under the effect of drawing liquid osmotic pressure, from mud, remove moisture gradually, make the water ratio of final mud be reduced to less than 60%.Final high dewatered sludge takes intermittently discharged to carry out final disposal.
Reactor 2 and 5, dilution is obtained from just permeating anaerobic digestion reaction vessel 2 and the high level cadre liquid that draws that positive permeable reactive device 5 flows out that dewaters.When the concentration drawing liquid be former draw 1/2 ~ 1/5 of liquid specific conductivity time, the hot side being returned membrane component 3 concentrates.Just permeating the dewater outlet of drawing liquid pool of positive permeable reactive device 5 of anaerobic digestion reaction vessel 2 and high level cadre to be connected with the hot side-entrance of membrane component 3 by pump, valve and pipeline.The hot side of membrane component 3 is connected with cold side by membrane distillation film.In the specific implementation, the mould material of described membrane component is organic polymer, and include but not limited to tetrafluoroethylene, polyvinylidene difluoride (PVDF), polyethylene etc., the form of film distillation film component comprises board-like, rolling, hollow fiber form or tubular type; Described membrane component is run for one or more groups simultaneously, and the hot side of membrane distillation is heated by water-bath, and by thermometer measure temperature, heating temperature range is 50 ~ 75 DEG C, and the temperature range of cold side can ensure higher membrane flux between 5 ~ 20 DEG C.The control of cold-side temperature environmentally temperature takes naturally cooling or refrigerator to control.The clear water that membrane distillation produces drives liquid recycle pump 8 to pump into membrane distillation by membrane distillation and drives liquid constant temperature circulating groove 4, and the clear water part that wherein membrane distillation produces is back to landscape water.
Claims (9)
1. one kind synchronously to be dewatered based on two membranous system that the anaerobic sludge digestion-high level cadre's dewatering process realizing adjustable high solid content mainly comprises anaerobic sludge digestion reaction member, just permeates solid content regulon, membrane distillation draws liquid upgrading unit and sludge high-drying dewatering unit after digestion.
Described anaerobic sludge digestion reaction member comprises: primary sludge pond, primary sludge pump, just permeate the parts such as anaerobic digestion reaction vessel sludge sump and stirring/temperature control; Primary sludge pond, primary sludge pump are connected with valve by pipeline with the opening for feed just permeating anaerobic digestion reaction vessel sludge sump;
The described solid content regulon that just permeating comprises: just permeating anaerobic digestion reaction vessel and drawing liquid pool, forward osmosis membrane assembly, just permeate and draw liquid recycle pump and flow monitoring function unit; Just permeating anaerobic digestion reaction vessel to draw liquid pool outlet, just permeating and draw liquid recycle pump and be connected with valve by pipeline with the hot side-entrance of membrane distillation;
Described membrane distillation draws liquid upgrading unit and comprises: membrane component, membrane distillation driving liquid recycle pump, membrane distillation driving liquid constant temperature circulating groove and temperature and flow monitoring control unit; The hot side outlet of membrane component with just permeate anaerobic digestion reaction vessel and draw liquid pool import and be connected with pipeline by valve; Membrane component cold side outlet port and membrane distillation drive liquid constant temperature circulating groove to be connected with valve by pipeline;
After described digestion, sludge high-drying dewatering unit comprises: high level cadre dewater positive permeable reactive device and high level cadre dehydration draw liquid recycle pump assembly; The dewater opening for feed of positive permeable reactive device of the outlet of just permeating anaerobic digestion reaction vessel sludge sump and high level cadre is connected with valve by pipeline, and high level cadre's outlet that positive permeable reactive device draws liquid pool of dewatering is connected with pipeline by valve with the hot side-entrance of membrane distillation;
Just permeating and drawing liquid recycle pump and be connected with pipeline by valve with the hot side-entrance of membrane component.
2. a kind ofly according to claim 1 synchronously to dewater the anaerobic sludge digestion-high level cadre's dewatering process realizing adjustable high solid content based on two membranous system, it is characterized in that, the described forward osmosis membrane just permeating anaerobic digestion reaction vessel, separating layer and support layer material are organic polymer, its separating layer include but not limited to cellulose acetate, cellulosetri-acetate, polymeric amide and with these materials for skeleton adds the permeable membrane material that other micro substances are formed, its supporting layer includes but not limited to polysulfones, polyethersulfone etc.
3. a kind ofly according to claim 1 synchronously to dewater the anaerobic sludge digestion-high level cadre's dewatering process realizing adjustable high solid content based on two membranous system, it is characterized in that, the mould material of described membrane component is organic polymer, includes but not limited to tetrafluoroethylene, polyvinylidene difluoride (PVDF), polyethylene etc.
4. a kind ofly according to claim 1 synchronously to dewater the anaerobic sludge digestion-high level cadre's dewatering process realizing adjustable high solid content based on two membranous system, it is characterized in that, the form of just permeating anaerobic digestion membrane module and film distillation film component comprises board-like, rolling, hollow fiber form or tubular type.
5. synchronously to dewater the anaerobic sludge digestion-high level cadre's dewatering process realizing adjustable high solid content based on two membranous system, comprise the following steps:
The first step, primary sludge is entered by primary sludge pump delivery and just permeates anaerobic sludge digestion reactor sludge sump and carry out anaerobic digestion and synchronous dehydration;
Second step, is just permeating and is drawing liquid and draw liquid pump and deliver into the hot side of membrane component by just to permeate and concentrate;
3rd step, concentrated draw liquid by recycle pump enter into just permeate anaerobic sludge digestion pond draw liquid side;
4th step, membrane distillation drives liquid to flow out through membrane distillation driving liquid recycle pump from the cold side of membrane component and enters into the cooling of membrane distillation driving liquid constant temperature circulating groove;
5th step, the membrane distillation after temperature reduces drives liquid to be circulated back to membrane component cold side and proceeds to align infiltration and draw the concentrated of liquid;
6th step, the mud just permeating anaerobic digestion reaction vessel sludge sump delivers into high level cadre's positive permeable reactive device that dewaters and continues concentrated after digestion reaction;
7th step, after digestion, the liquid that draws of sludge high-drying dewatering unit draws liquid recycle pump by high level cadre's dehydration and delivers into the hot side of membrane component and concentrate;
8th step, liquid is circulated back to that high level cadre dewaters positive permeable reactive device draws liquid side for drawing of having concentrated;
9th step, after digestion, the mud of sludge high-drying dewatering unit is discharged and is carried out last disposal.
6. method for sludge treatment according to claim 5, is characterized in that, the heating temperature range just permeating anaerobic digestion reaction vessel sludge sump in the first step is 30 ~ 55 DEG C.
7. method for sludge treatment according to claim 5, is characterized in that, in second step, the hot side heating temperature range of membrane component is 50 ~ 75 DEG C.
8. method for sludge treatment according to claim 5, it is characterized in that, in second step draw liquid type include but not limited to ionizable solion, organic molecule solution, nanometer particle colloid liquid, the dense water of desalination process and other can produce the solution of stronger osmotic pressure.
9. method for sludge treatment according to claim 5, is characterized in that, after the digestion in the 6th step, the mud after anaerobic digestion proceeds to dewater and concentrates by sludge high-drying dewatering unit, and final water ratio reaches less than 60%.
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| CN106915886A (en) * | 2017-03-24 | 2017-07-04 | 中国市政工程中南设计研究总院有限公司 | A kind of new sludge treatment equipment and method |
| CN109071274A (en) * | 2016-03-04 | 2018-12-21 | 应用仿生学有限公司 | Use the electricity-generating method of infiltration and waste water fermentation processing |
| CN112456718A (en) * | 2020-12-16 | 2021-03-09 | 北京城市排水集团有限责任公司 | Device and method for treating anaerobic digestion liquid of pyrohydrolysis sludge |
| CN114368892A (en) * | 2021-12-29 | 2022-04-19 | 图方便（苏州）环保科技有限公司 | Sludge treatment device with dehydration function and application thereof |
| CN114368887A (en) * | 2021-12-29 | 2022-04-19 | 图方便（苏州）环保科技有限公司 | Sludge treatment device capable of promoting microbial fermentation and application thereof |
| CN114460264A (en) * | 2021-07-26 | 2022-05-10 | 北京建筑大学 | Evaluation method for sludge dewatering performance |
| CN115069089A (en) * | 2022-07-25 | 2022-09-20 | 北京建筑大学 | Forward osmosis sludge deep dehydration device |
| CN115367839A (en) * | 2022-07-14 | 2022-11-22 | 中节能工程技术研究院有限公司 | Anaerobic digestion liquid treatment device |
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| CN114460264A (en) * | 2021-07-26 | 2022-05-10 | 北京建筑大学 | Evaluation method for sludge dewatering performance |
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| CN114368887A (en) * | 2021-12-29 | 2022-04-19 | 图方便（苏州）环保科技有限公司 | Sludge treatment device capable of promoting microbial fermentation and application thereof |
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| CN115069089A (en) * | 2022-07-25 | 2022-09-20 | 北京建筑大学 | Forward osmosis sludge deep dehydration device |
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