CN103805503A - Device for enhancing organic sludge fermentation acid production and application thereof - Google Patents
Device for enhancing organic sludge fermentation acid production and application thereof Download PDFInfo
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Abstract
The invention discloses a device for enhancing organic sludge fermentation acid production and an application thereof, belonging to the field of environmental engineering. In the invention, the dynamic membrane separation technology is applied to a traditional sludge anaerobic fermentation acid production system; with the separation effect of a dynamic membrane, online separation of the fermented sludge from the soluble product acid is realized. On one hand, by completely holding the solid sludge in a reaction device, the reaction time is prolonged, and the sludge conversion rate is improved; on the other hand, by discharging the filtrate containing the product acid in time, the volume of the reaction device can be reduced, and the operation cost and investment cost are lowered; moreover, through timely transfer of the product acid, the negative feedback effect of the product acid on the fermentation process can be relieved, and the acid production rate through sludge fermentation is improved. By adopting the technical scheme, the existing organic matter sludge anaerobic digestion system is remarkably optimized, and further popularization and application of the anaerobic digestion technology are facilitated.
Description
Technical field
The present invention relates to a kind of device and application thereof of strengthening organic sludge fermentation and acid, belong to field of environment engineering.
Background technology
The municipal sewage plant of China's overwhelming majority all adopts Wastewater Treated by Activated Sludge Process at present, in its treating processes, can produce a large amount of excess sludges.According to Chinese Ministry of Environmental Protection statistics, by by the end of September, 2012, China's accumulative total is built up 3272 of urban wastewater treatment firms, and wet mud (water capacity 80%) annual production reaches 3,360 ten thousand tons, more will break through 4,600 ten thousand tons to " the 12 " end of term.The processing of excess sludge is disposed has become sewage work's white elephant, and the minimizing and the resource utilization that how to realize excess sludge become the emphasis that current sludge treatment disposal is studied.
Sludge fermentation produce acid for realizing reducing urban sludge, recycling provides a new thinking.Organic cheapness in mud production is converted into high added value biochemical products, reduces excess sludge production; And, change the organism of anaerobic digester system into organic acid, rather than greenhouse gases carbonic acid gas and methane, have great significance to realizing carbon emission reduction.But, existing sludge fermentation is produced sour technique before large-scale promotion, also has some problems: 1. due to sludge anaerobic fermentation and acid production long reaction time, cause reactor volume larger, stir energy consumption high, heating and thermal insulation is inconvenient, and overall investment cost and running cost all higher; 2. the product acid of higher concentration has restraining effect to the further fermentation and acid process of mud, is difficult to realize the raising of mud transformation efficiency.
Fermentation and acid membrane bioreactor be by application of membrane separation technology in traditional fermentor tank, the sour selectivity of holding back completely and produce that realizes fermentation substrate sees through, compared with traditional zymotic process, its advantage is mainly manifested in: 1. greatly reduced sludge fermentation reactor volume, in traditional zymotic tank, sludge retention time (SRT) is identical with hydraulic detention time (HRT), and fermentation and acid membrane bioreactor is using film as mud-water separation means, solid phase is almost trapped completely, realize separating of HRT and SRT in fermenting process, be conducive to reduce reactor volume.2. can improve the acid production rate of substrate, owing to can in time product acid being migrated out to reactor, reduce negative feedback inhibition effect; Meanwhile, because substrate is trapped within reactor, fermentation reaction is more abundant.3. can reduce the impact of high molecular polymer on fermentation and acid, adopt membrane separation concentration technology, can reduce the usage quantity of (or saving completely) high molecular polymer.But it is the bottleneck problem that restricted fermentation produces sorrel bio-reactor large-scale promotion application that film pollutes.
Spontaneous bio-dynamic membrane refers to that microorganism and meta-bolites thereof, on porous supporting body (membrane matrix) surface, precipitate formed membrane sepn layer by circulation in the process of filtration mud mixture.Compared with conventional separatory membrane, Dynamic Membrane has more advantage, as: 1. filter pressure is little, and filtering membrane resistance is compared with little 1 order of magnitude of microfiltration membrane, and water outlet can adopt flow by gravity water outlet; 2. adopt wide aperture material to make Dynamic Membrane carrier, reduced the cost of membrane module, and preparation process is simple and easy to do; 3. permeation flux is high, than the high 1-4 of the membrane flux of microfiltration membrane doubly; 4. contamination resistance is strong, and easy to clean, without problems such as irreversible membrane foulings.
In sum, spontaneous bio-dynamic membrane is applied in traditional sludge fermentation and acid system, can greatly reduces fermentor tank volume, improve fermentation and acid efficiency, but also there is no the problems such as the existing film pollution of common separation film, energy consumption height.
Summary of the invention
The object of the invention is that traditional sludge fermentor tank existing volume is large in order to solve, operation and cost of investment high, and product acid is to problems such as negative feedback inhibition effect, the substrate conversion efficiency of fermentation and acid process are low; The one efficient organic sludge fermentation and acid method and the device that provide.
For this reason, first the present invention provides a kind of device of strengthening organic sludge fermentation and acid, by main reaction container and spontaneous bio-dynamic membrane module composition; Main reaction container is sealed structure, primary sludge enters from the opening for feed on reactor top, under the mixing effect of whipping appts, carry out anaerobic fermentation and acid production reaction, reactor side is provided with thief hole, top is provided with water seal venting port, the solvability organic acid producing, under syphonic effect power, passes through dynamic film component, discharge in time from the water outlet of main reaction bottom with fermented liquid, realize flow by gravity water outlet, excess sludge is discharged from the mud discharging mouth of bottom, and dynamic film component adopts tubular structure, and be fixed on rotation axis, on rotation axis, install impeller simultaneously.
Described device comprises main reaction container 1, dynamic film component 4, opening for feed 2, whipping appts 6, thief hole 8, venting port 3, water outlet 5, mud discharging mouth 7, rotation axis 10, the impeller 9 of sealed structure.Main reaction container is sealed structure, primary sludge enters from the opening for feed 2 on reactor top, under the mixing effect of whipping appts 6, carry out anaerobic fermentation and acid production reaction, reactor side is provided with thief hole 8, top is provided with water seal venting port 3, the solvability organic acid producing, under syphonic effect power, by dynamic film component 4, discharge in time from water outlet 5 with fermented liquid, realize flow by gravity water outlet, excess sludge is discharged from the mud discharging mouth 7 of bottom, dynamic film component 4 adopts tubular structure, and be fixed on rotation axis 10, on rotation axis 10, install impeller 9 simultaneously, the rotation of rotation axis is on the one hand for Dynamic Membrane 4 provides surperficial cross-flow, play on the other hand fermented sludge and mix effect.
The present invention also provides the method for applying described device strengthening organic sludge fermentation and acid, the singularity based on spontaneous bio-dynamic membrane, apply it to the fermentation and acid process of organic sludge, realize on the one hand holding back solid matter, SRT and HRT are divided out, dwindle reactor volume, extend the reaction times of organic sludge, reduce cost, put forward high acid efficiency; On the other hand, be dissolved in the organic acid in liquid phase by timely transfer, alleviate the negative feedback inhibition effect of product to fermenting process, improve organic sludge transformation efficiency.
The start-up course of described device is first dynamic film component to be taken out, mud is reached after steady state according to order batch mode fermentation and acid, carry out fermented sludge by semi-continuous operation scheme again and produce acid, after in installing, organic acid concentration again reaches and stablizes, the startup of device completes, and finally dynamic film component is put into.
The process operation condition of applying described device strengthening organic sludge fermentation and acid is:
(1) to produce the substrate of sour self-forming dynamic membrane reactor be that municipal sludge class is applicable to the organic solid material that microorganism utilizes to sludge fermentation, and organic content is higher, can bioavailability better, and the efficacy performance of device must be more superior;
(2) to produce sludge-filled rate in sour self-forming dynamic membrane device be 70-75% to sludge fermentation, and effective volume is 14-15L, and sludge retention time (SRT) is 7-15 days, and reaction pH is 7-11, and temperature is 25-55 ℃;
(3) to produce the running environment of sour self-forming dynamic membrane device be strictly anaerobic to sludge fermentation, and sludge concentration is 10-75gTS/L;
(4) to produce sour self-forming dynamic membrane device Dynamic Membrane matrix aperture be 100-500 order to sludge fermentation, and membrane flux is 0.5-2.5L/m
2/ h, water outlet pressure reduction is 0-100cm water column;
(5) sludge fermentation is produced sour self-forming dynamic membrane reactor operation scheme and is: under the condition of constant level, enter continuously mud, continuous effluent and spoil disposal intermittently, rotating speed is 50-150 rev/min, and water outlet membrane flux is 0.5-2.5L/m
2/ h, entering mud speed is 90-160mL/h, and going out water speed is 50-80mL/h, and sludge volume is 1-2L/ time, and spoil disposal frequency is every 2 days 1 time.
The present invention provides the control strategy polluting for Dynamic Membrane in described device simultaneously:
(1) in normal course of operation, by the velocity of rotation of regulating rotary moving axis, for Dynamic Membrane face provides the face cross-flow (0.6-1.2m/s) of suitable size, control face cake layer thickness, pollute to alleviate film.
(2) in the time that membrane resistance increases to the gravity water outlet limit, stop water outlet, the speed of rotation that increases rotation axis provides face cross-flow (1.2-2.4m/s), simultaneously within certain interval time, detect the changing conditions of membrane resistance, until membrane resistance returns to the size of initial film resistance, reduce the speed of rotation of rotation axis, recover water outlet.
Described device utilizes sludge fermentation to produce sour operating performance: (1) can reach more than 99% the rejection effect of solid mud, and water outlet SS content is lower than 200mg/L; (2) to product acid without obviously holding back, and in water outlet, VFAs concentration can improve 40% left and right, sludge fermentation is produced sour efficiency and has been improved 40%; (3), the in the situation that of lower membrane flux and certain face cross-flow, Dynamic Membrane can steady running more than 30 days.
Method of the present invention has following beneficial effect: (1) sludge fermentation is produced sour self-forming dynamic membrane device by the centrifugation of Dynamic Membrane, mud is trapped in reactor completely, realize separating of sludge retention time and hydraulic detention time, reduce reactor volume, reduced running cost and cost of investment; The hydrolysis, the transformation time that have extended solid matter, improved substrate conversion efficiency.(2) sludge fermentation is produced sour self-forming dynamic membrane device by the selective permeation effect of Dynamic Membrane, and product organic acid is discharged to reactor in time, alleviates its reverse feedback effect to fermentation and acid process, improves acid production rate.(3) sludge fermentation is produced sour self-forming dynamic membrane device and is adopted Dynamic Membrane, and its cost of manufacture is low, far below traditional separatory membrane; And can flow by gravity water outlet, save operation energy consumption.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of strengthening organic sludge fermentation and acid device; 1: main body, 2: opening for feed, 3: venting port, 4: dynamic film component, 5: water outlet, 6: whipping appts, 7: mud discharging mouth, 8: thief hole, 9: impeller, 10: rotation axis, 11: base.
Fig. 2 is the fermentation and acid effect of strengthening organic sludge fermentation and acid device.
Fig. 3 is the change curve of suspended substance in the water outlet of strengthening organic sludge fermentation and acid device.
Fig. 4 is the change curve of strengthening organic sludge fermentation and acid device run duration flux.
Embodiment
Experimental technique described in following embodiment, if no special instructions, is ordinary method; Described reagent and material, if no special instructions, all can obtain from commercial channels.
Membrane module in contrive equipment (Fig. 1) is taken out, certain density organic sludge is imported in device, filling ratio is 70-75%, and effective volume is 14-15L, and sludge concentration is adjusted into 10-70gTS/L, and pH is 7-11; According to the ratio of 5-15%, access kind of mud; Airtight, according to order batch mode, anaerobic digestion reaction, and to adopt whipping appts continuously stirring, rotating speed be 50-150 rev/min, sustained reaction 8-15 days.Getting every other day mud in device carries out centrifugal, measure the organic acid concentration in its supernatant liquor, when device in organic acid concentration reach stablize after (seeing the first stage in Fig. 2), device changes semi-continuous operation scheme into, be to discharge the rear mud of 1-2L fermentation every day, import 1-2L fresh sludge, steady running 5-15 days, when device in organic acid concentration again reach stablize after (seeing the subordinate phase in Fig. 2), the startup of device completes.Front two stages are not laid membrane module, employing be existing technique, can be used as contrast.
After starting successfully, in membrane module embedding device, form strengthening organic sludge fermentation and acid device (see figure 1), adopt the operation scheme of entering continuously mud, continuous membrane filter water outlet and regular spoil disposal.And by parameters such as measuring apparatus every day interior TS, VSS, VFAs, water outlet SS, membrane flux and membrane resistances, adjust in time the operating parameters such as sludge volume, pH, stirring velocity.
Test run(s) result shows, by the optimization of operating parameter, that is: sludge concentration is 10-70gTS/L, and pH is 7-11, and rotating speed is 50-150 rev/min, and water outlet membrane flux is 0.5-2.5L/m
2/ h, entering mud speed is 90-160mL/h, and going out water speed is 50-80mL/h, and sludge volume is 1-2L/ time, and spoil disposal frequency is every 2 days 1 time.Device is under designing treatment amount, and Dynamic Membrane has realized almost 100% sludge retention rate, and effluent SS is less than 0.2g/L(Fig. 3); Reached product organic acid and shifted in time, in water outlet, VFAs concentration reaches 3.3g/L(Fig. 2 phase III).And the more traditional sequence batch (fermentation (first stage) of steady running acid production rate (phase III) of device has improved 32.40%, more conventional continuously fermenting (subordinate phase) improved 230.10%.Meanwhile, Dynamic Membrane can steady running, and under small throughput condition, the SS concentration in water outlet remains on below 0.2g/L always; And Dynamic Membrane can reach stable in 75min, afterwards, membrane flux do not significantly decrease (Fig. 4).
Although the present invention with preferred embodiment openly as above; but it is not in order to limit the present invention, any person skilled in the art, without departing from the spirit and scope of the present invention; all can do various changes and modification, therefore protection scope of the present invention should be with being as the criterion that claims were defined.
Claims (8)
1. a device of strengthening organic sludge fermentation and acid, is characterized in that, by main reaction container and spontaneous bio-dynamic membrane module composition, realization is held back solid matter, and shifts the organic acid being dissolved in liquid phase in time.
2. device according to claim 1, is characterized in that, primary sludge enters from the opening for feed of main reactor, under the mixing effect of whipping appts, carries out anaerobic fermentation and acid production reaction; Main reactor side is provided with thief hole, and top is provided with water seal venting port; The solvability organic acid producing, under syphonic effect power, is discharged from the water outlet of main reaction container bottom with fermented liquid in time by spontaneous biodynamic membrane module, realizes flow by gravity water outlet; Excess sludge is discharged from the mud discharging mouth of bottom; Described spontaneous biodynamic membrane module adopts tubular structure, and is fixed on rotation axis, installs impeller on rotation axis simultaneously.
3. device according to claim 2, is characterized in that, the matrix aperture of described spontaneous bio-dynamic membrane is 100-500 order, and membrane flux is 0.5-2.5L/m
2/ h, water outlet pressure reduction is 0-100cm water column.
4. device according to claim 2, it is characterized in that, described device comprises main reaction container (1), dynamic film component (4), opening for feed (2), whipping appts (6), thief hole (8), venting port (3), water outlet (5), mud discharging mouth (7), rotation axis (10) and the impeller (9) of sealed structure.
5. device according to claim 4, it is characterized in that, main reaction container (1) is sealed structure, primary sludge enters from the opening for feed (2) on reactor top, under the mixing effect of whipping appts (6), carry out anaerobic fermentation and acid production reaction, reactor side is provided with thief hole (8), top is provided with water seal venting port (3), the solvability organic acid that fermentation produces is under syphonic effect power, discharge in time from water outlet (5) with fermented liquid by dynamic film component (4), realize flow by gravity water outlet, excess sludge is discharged from the mud discharging mouth (7) of bottom, dynamic film component (4) adopts tubular structure, and be fixed on rotation axis (10), on rotation axis (10), install impeller (9) simultaneously, the rotation of rotation axis provides surperficial cross-flow for Dynamic Membrane (4) on the one hand, play on the other hand fermented sludge and mix effect.
6. application rights requires the method for the arbitrary described device strengthening organic sludge fermentation and acid of 2-5, it is characterized in that, described apparatus sewage sludge filling ratio is 70-75%, effective volume is 14-15L, operation scheme is under constant level, to enter continuously mud, continuous effluent and spoil disposal intermittently, and running environment is strictly anaerobic, and sludge concentration is 10-75gTS/L, reaction pH is 7-11, and temperature is 25-55 ℃.
7. method according to claim 6, is characterized in that, mixing speed is 50-150 rev/min, and water outlet membrane flux is 0.5-2.5L/m
2/ h, entering mud speed is 90-160mL/h, and going out water speed is 50-80mL/h, and sludge volume is 1-2L/ time, and spoil disposal frequency is every 2 days 1 time.
8. method according to claim 6, is characterized in that, in normal course of operation, by the velocity of rotation of regulating rotary moving axis, for Dynamic Membrane face provides the face cross-flow of 0.6-1.2m/s, controls face cake layer thickness, pollutes to alleviate film; In the time that membrane resistance increases to the gravity water outlet limit, stop water outlet, increase rotation axis and improve face cross-flow to 1.2-2.4m/s, detect the changing conditions of membrane resistance simultaneously, until membrane resistance returns to the size of initial film resistance, reduce the speed of rotation of rotation axis, recover water outlet.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106430591A (en) * | 2016-12-19 | 2017-02-22 | 大连爱特流体控制有限公司 | Multiphase flow dynamic membrane downflow aerobic air-lift integrated reactor |
| CN106430574A (en) * | 2016-12-19 | 2017-02-22 | 大连爱特流体控制有限公司 | Multiphase-flow dynamic-membrane anaerobic down-flow three-phase reactor |
| CN107384753A (en) * | 2017-08-15 | 2017-11-24 | 西安建筑科技大学 | A kind of efficient anaerobic fermentation bioreactor of dynamic membrane |
| CN115595336A (en) * | 2022-10-17 | 2023-01-13 | 北京林业大学（Cn） | Method for enhancing anaerobic fermentation of sludge to produce acid and application |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106430591A (en) * | 2016-12-19 | 2017-02-22 | 大连爱特流体控制有限公司 | Multiphase flow dynamic membrane downflow aerobic air-lift integrated reactor |
| CN106430574A (en) * | 2016-12-19 | 2017-02-22 | 大连爱特流体控制有限公司 | Multiphase-flow dynamic-membrane anaerobic down-flow three-phase reactor |
| CN107384753A (en) * | 2017-08-15 | 2017-11-24 | 西安建筑科技大学 | A kind of efficient anaerobic fermentation bioreactor of dynamic membrane |
| CN107384753B (en) * | 2017-08-15 | 2024-01-23 | 西安建筑科技大学 | High-efficiency anaerobic fermentation dynamic membrane bioreactor |
| CN115595336A (en) * | 2022-10-17 | 2023-01-13 | 北京林业大学（Cn） | Method for enhancing anaerobic fermentation of sludge to produce acid and application |
| CN115595336B (en) * | 2022-10-17 | 2024-02-20 | 北京林业大学 | Method for enhancing anaerobic fermentation acid production of sludge and application |
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