CN103408142B - Method for rapidly solving sticky sludge bulking problem - Google Patents
Method for rapidly solving sticky sludge bulking problem Download PDFInfo
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- CN103408142B CN103408142B CN201310359766.4A CN201310359766A CN103408142B CN 103408142 B CN103408142 B CN 103408142B CN 201310359766 A CN201310359766 A CN 201310359766A CN 103408142 B CN103408142 B CN 103408142B
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Abstract
The invention relates to a method for rapidly solving sticky sludge bulking problem and belongs to the field of biochemical wastewater treatment. For a sticky sludge bulking problem caused by a high organic load, a means that inflow water supply is diluted and an operation mode of a reactor is changed is adopted, so that a system operates under the conditions of low inflow water organic load and high substrate concentration gradient; the sludge settleability is controlled in real time and conditions are improved in real time by detecting parameters such as a sludge volume index, an extracellular polymeric substance and a Zeta potential in an operation process. Practice shows that the sludge settleability can be obviously improved by continuously operating the method for rapidly solving the sticky sludge bulking problem for 2-8 days; in a later operation process, recurrence of the sticky sludge bulking problem can be effectively prevented by improving an inflow water and operation mode of a system. The method for rapidly solving the sticky sludge bulking problem has the advantages of short period, low recurrence rate, low economic cost and small influence on sludge activity and can be taken as an alternative scheme for rapidly and efficiently solving the sticky sludge bulking problem in an activated sludge process system.
Description
Technical field
The present invention relates to a kind of method that fast, effectively solves stickiness sludge bulking problem more common in sewage disposal process by activated sludge process, belong to biochemical process sewage treatment area, be applicable to the municipal sewage plant of various scales and the industrial effluent treatment plant of employing Activated Sludge Process.
Background technology
The most sewage disposal process by activated sludge process that adopt of current sewage work in all parts of the country.Active sludge ratio juris is to utilize active sludge microorganism in growth metabolism process, to need to consume the physiological property of the pollution substance in sewage, make active sludge fully mix and contact with sewage, utilize microorganism fast degradation pollution substance, and realize the qualified discharge after sewage disposal by mud-water separation.Wherein the speed of mud-water separation directly has influence on the processing efficiency of sewage work and the stability of system operation, and mud-water separation speed be called sludge bulking slowly.It is long that the mud expanding is realized the required time of mud-water separation; And after mud expands, because microbial population structural performance changes, degradation of pollutant efficiency also can suffer considerable influence.Therefore problem, how to prevent and solve sludge bulking is the key of Cheng Liao sewage work stable and high effective operation just.
Sludge bulking is divided into Filamentous Bulking and the large class of stickiness sludge bulking two, and wherein Filamentous Bulking is caused by thread fungus propagation, and existing a large amount of research for this type of sludge bulking at present has also been set up corresponding solution.Another kind of sludge bulking---stickiness sludge bulking, be mainly that to cause microorganism extracellular polymeric excessive secretion, extracellular polymeric component to change, adsorb a large amount of combination water caused due to organism surplus in sewage, at the unbalanced industry waste water of nutrition (as: food processing wastewater, leather-making waste water, malting effluent etc.), treatment plant is more common.The mud that stickiness expands occurs, and protein component contained in its flco extracellular polymeric reduces, and polysaccharide component increases, Sludge Surface negative charge quantity reduces, in conjunction with water-content, increase in a large number, cause sludge settling compacting difficulty, badly influence the effect of mud-water separation.
At present, to the research of stickiness sludge bulking seldom, there is no the Prevention and control strategy for stickiness sludge bulking problem, existing Filamentous Bulking prevention solution is not also suitable for stickiness sludge bulking, and most sewage works are all solve or allow it recover voluntarily by adding the method for weighting agent or coagulation agent when running into the problem of stickiness expansion.Not only Financial cost is high to add medicament, and expansion issues easily recurs; And occur after stickiness sludge bulking, the cycle of letting alone to recover voluntarily required is very long.Therefore, a kind of method that be necessary to seek economy, solves efficiently stickiness sludge bulking problem, to ensure the steady running of sewage work.If can secrete superfluous feature according to the extracellular polymeric of stickiness bulking sludge, take specific condition to make microorganism degrade and utilize self secreted extracellular polymeric rapidly, discharge rapidly the combination water outside born of the same parents, can solve the problem of stickiness sludge bulking in economical and efficient ground.
Summary of the invention
The object of the invention is to propose a kind of method of quick solution stickiness sludge bulking problem, solve sewage work and suffer the stickiness sludge bulking problem puzzlement problems such as the restore cycle is long afterwards, Financial cost is high, operating performance is unstable.Its principle is under the condition of supplying with at restriction substrate, utilize zoogloea microorganism to decompose to utilize the characteristic of self secreted extracellular polymeric when substrate is limited, extend the endogenous respiration phase of microorganism, in the situation that not affecting microorganism active, realize the quick release of the combination water adhering to around zoogloea, effectively solve stickiness sludge bulking problem.
A method for quick solution stickiness sludge bulking problem, is characterized in that comprising the following steps:
(1) dilution water inlet is supplied with; To there is the system of stickiness sludge bulking, measure the COD concentration in its water inlet, calculate required Dilution ratio, with tap water or sewage work's second pond water outlet, water inlet is diluted, make inlet COD concentration after dilution between 150-200mg/L;
(2) regulate reactor operational mode and monitor sludge settling property recovery situation; For sequencing batch reactor, the monocycle is divided into anoxia stirring 1-1.5h, aerobic aeration 2-3h, precipitation 0.5-1.5h, draining and idle 0-0.5h according to sequencing, and wherein the anoxia stirring time comprises flooding time 10-30min; For continuous flow reactor, regulating water inlet flow velocity to make hydraulic detention time is 6-8h, and anoxic and aerobic hydraulic detention time ratio are set as 1:2-2:3, and internal reflux ratio is set as 100%-150%, and return sludge ratio is set as 80%-100%; The dissolved oxygen concentration of the reactor of above two types under aerobic condition is all controlled at 2.0-2.5mg/L; Adopt above-mentioned operation scheme to move continuously the system that stickiness sludge bulking occurs, sludge settling property is restored; Between continuous operating period, system is not carried out to spoil disposal, monitor SVI, extracellular polymeric or the Zeta potential value of mud every day, when the SVI of mud value is lower than 150ml/g, and in extracellular polymeric the ratio of protein concn and polysaccharide mass concentration in the scope of 1-1.5 or Zeta potential between ± 10mv, think that stickiness sludge bulking problem solves, out of service and enter next step; In order to ensure treatment effect, and sludge activity is not caused damage, the continuous operating time of this step is defined as to 2-8 days, move at least continuously 2 days, be no more than at the most 8 days;
(3) improved system water inlet and operation scheme; After stickiness sludge bulking recovers, whether should measure the former water inlet organic loading of system higher than 0.5Kg COD/Kg MLSS/d, if water inlet organic loading is worth higher than this, in operational process, by minimizing sludge volume or with the water outlet of Sewage Plant, dilute the mode of intaking, make into water organic loading lower than 0.5Kg COD/Kg MLSS/d; For sequence batch (system, adopt aerobic operation scheme after first anoxic, the time of anoxic, aerobic operation, controlling aerobic stage dissolved oxygen concentration was 2.0 ± 0.2mg/L than being 1:2-2:3; For continuous-flow system, adopt the preposition operation scheme of anoxic, anoxic and aerobic hydraulic detention time are than being 2:5-2:3, controlling aerobic stage dissolved oxygen concentration is 2.0 ± 0.2mg/L; If continuous-flow system is set up preposition anaerobic zone, anaerobism is 1:5-1:4 with aerobic hydraulic detention time ratio.
The present invention compares with the method for existing solution stickiness sludge bulking problem, and tool has the following advantages:
(1) cycle shorter, successful; Present method takes full advantage of the physiological property of active sludge microorganism, makes it under the condition of substrate scarcity, change rapidly its surface property, shows as the rapid improvement of sludge settling property in macroscopic view; The degrees of expansion that viewing system is different, processes continuously and can obtain significant effect in 2-8 days, and sludge settling property can be improved thoroughly;
(2) tackle the problem at its root, recurrence rate is low; Present method has been improved the surface property of mud flco from the angle of microcosmic, active sludge flco is obviously reduced in conjunction with water-content, has fundamentally solved the problem of sludge settling difficulty; The reasonable adjusting of later stage operation scheme can suppress occurring again of mud stickiness expansion well;
(3) Financial cost is low; Compare with the method that adds the expansion of weighting agent solution stickiness, present method just utilizes the physiological property of microorganism to solve problem, does not need to add extra medicament, has reduced Financial cost;
(4) very little to the activity influence of mud; Present method, in application process, has just limited the substrate of active sludge and has supplied with, and does not cut off its substrate source, and method is in implementation process, and anoxic, the aerobic operation scheme replacing are very beneficial for maintaining of zoogloea bacterium activity; Therefore after finishing dealing with, mud is continued to remove the capacity of organism and denitrogenation dephosphorizing very little, in the 1-2 of microbic activity after finishing dealing with days, can recover normal level.
Accompanying drawing explanation
Fig. 1 is the device schematic diagram that the present invention applies in sequence batch (
Fig. 2 is that before and after the present invention processes, the interior sludge settling property of system improves situation
Fig. 3 is the photo of mud microscopy before and after the present invention processes
In Fig. 1: 1-inlet chest; 2-intake pump; 3-magnetic stirring apparatus; 4-sludge pump; 5-spoil disposal pond; 6-time switch system; 7-outlet valve; 8-pressure lock; 9-air flowmeter; 10-pneumatic pump; 11-outlet sump; 12-electric wire.
In Fig. 3: (a) be stickiness bulking sludge microscopic examination photo, shooting time is the 5th day of time shown in Fig. 2; (b) be the mud microscopic examination photo of fast processing after completing, shooting time is the 10th day of time shown in Fig. 2; Two figure magnification when taking is 100 times.
Embodiment
Below in conjunction with accompanying drawing and the application example in sequence batch (system, the present invention is further illustrated.
Be illustrated in figure 1 sequence batch (device schematic diagram, reactor useful volume is 12L, high 50cm, diameter 17.5cm, adopt time switch system 6 to control the keying of intake pump 2, magnetic stirring apparatus 3, pressure lock 8 and the outlet valve 7 of reactor, carry out the automatic operation of realization response device, moved for 4 cycles every day, each cycle 6h, sequencing batch reactor one-period is by the water inlet of 10min anoxia stirring, 170min aerobic aeration, 150min precipitation, 30min draining and idle composition, each cycle draining ratio is 50%, and hydraulic detention time is 12h, and sludge age is 20 days.Its water inlet is artificial distribution, and in water inlet, COD concentration is 1000mg/L, and ammonia nitrogen concentration is 30mg/L, and inorganic phosphorus concentration is 6mg/L, also contains other required nutritive elements of microorganism growth (comprising K, Ca, Mg etc.) in water distribution.Aerobic zone dissolved oxygen maintains 2.0-2.5mg/L, and sludge concentration maintains 2000-2500mg/L, and water inlet organic loading is 0.8-1.0Kg COD/Kg MLSS/d.Because organic loading is too high, in system, there is typical stickiness sludge bulking, the visible mud flco of microscopy around exist more combination water (Fig. 3 a), thread fungus quantity seldom, more than SVI has reached 400ml/g; In extracellular polymeric, the mass concentration ratio of protein and polysaccharide is low to moderate 0.56; The Zeta potential on active sludge flco surface is higher than 18mv; These indexs all show that stickiness expansion has occurred mud.
Concrete operation step of the present invention is as follows:
(1) dilution water inlet is supplied with; By water inlet with tap water according to the dilution proportion of 1:4, the COD concentration after dilution is 200mg/L;
(2) regulate reactor operational mode and monitor sludge settling property recovery situation; Remain constant into water 10min, by revising the program of time switch system (6), monocycle operation scheme is revised as: 120min anoxia stirring+180min aerobic aeration+50min precipitation+10min draining and idle; Aerobic zone dissolved oxygen concentration is increased to 2.2 ± 0.2mg/L, system is not carried out to spoil disposal, continuous operational system; Measure sludge settling property and the extracellular polymer substrate concentration of system every day, sludge settling property measurement result as shown in Figure 2, while running to the 4th day, SVI has been reduced to the level of 145ml/g, now in extracellular polymeric the mass concentration ratio of protein and polysaccharide in 0.8 left and right, ratio is still lower than 1, therefore continue to maintain this operational mode to the 6 days, in extracellular polymeric, the mass concentration ratio of protein and polysaccharide reaches 1.1 level, now think that the expansion of mud stickiness recovers, and stops the operation scheme of this step and enters next step; If this step is not measured the concentration of extracellular polymeric, can measure corresponding Zeta potential value and substitute, when between return to ± 10mv of Zeta potential value, can stop the operation scheme of this step, enter next step;
(3) improved system water inlet and operation scheme; In above-mentioned sequence batch (system in operational process, its water inlet organic loading reaches 0.8-1.0Kg COD/Kg MLSS/d, the expansion of mud stickiness, mainly due to too high the causing of loading in water inlet, therefore will prevent that the secondary that mud stickiness expands from occurring, the influent load of necessary reduction system; Adopt the mode of dilution water inlet, with water outlet and the original system of reactor, intake according to the volume mixture of 1:1, system water inlet after being diluted, COD of sewage after dilution is 520mg/L left and right, its organic loading is 0.4-0.5Kg COD/Kg MLSS/d as calculated, system flooding time is set as 10min, maintaining aerobic stage dissolved oxygen concentration is 2.0mg/L, sludge concentration still maintains 2000-2500mg/L, mode with aerobic aeration 180min after first anoxia stirring 110min is moved, and the time of anoxic (comprising anoxic flooding time), aerobic operation is than being 2:3;
After mud stickiness expands and recovers, the operation result in continuous 60 cycles shows, in system, sludge settling property is always good, SVI is all the time lower than 150ml/g, the problem that mud stickiness expands is recurrence not, and denitrogenation dephosphorizing obvious processing effect, and ammonia nitrogen removal frank reaches 100%, inorganic phosphorus clearance reaches more than 95%, and COD clearance also can reach more than 87%.
For continuous-flow system, operating method is substantially similar to sequence batch (system, just when step (2), first regulating water inlet flow velocity to make hydraulic detention time is 6-8h, and anoxic and aerobic hydraulic detention time ratio are set as to 1:2-2:3, and internal reflux ratio is set as 100%-150%, return sludge ratio is set as 80%-100%, aerobic stage Dissolved Oxygen concentration Control, in the level of 2.0-2.5mg/L, does not carry out spoil disposal to system, and continuous operational system carries out Recovery processing; When step (3), except regulating water inlet flow velocity to make organic loading lower than 0.5KgCOD/Kg MLSS/d, also should guarantee that the dissolved oxygen concentration of aerobic stage reaches the normal level of 2.0 ± 0.2mg/L, and anoxic and aerobic hydraulic detention time are than the optimization range that reaches 2:5-2:3, if set up anaerobic zone, anaerobism should be set as 1:5-1:4 with aerobic hydraulic detention time ratio, reduces the risk of stickiness sludge bulking recurrence.
Claims (1)
1. a method for quick solution stickiness sludge bulking problem, is characterized in that comprising the following steps:
(1) dilution water inlet is supplied with; To there is the system of stickiness sludge bulking, measure the COD concentration in its water inlet, calculate required Dilution ratio, with tap water or sewage work's second pond water outlet, water inlet is diluted, make inlet COD concentration after dilution between 150-200mg/L;
(2) regulate reactor operational mode and monitor sludge settling property recovery situation; For sequencing batch reactor, the monocycle is divided into anoxia stirring 1-2h, aerobic aeration 2-3h, precipitation 0.5-1.5h, draining and idle 0-0.5h according to sequencing, and wherein the anoxia stirring time comprises flooding time 10-30min; For continuous flow reactor, regulating water inlet flow velocity to make hydraulic detention time is 6-8h, and anoxic and aerobic hydraulic detention time ratio are set as 1:2-2:3, and internal reflux ratio is set as 100%-150%, and return sludge ratio is set as 80%-100%; The dissolved oxygen concentration of the reactor of above two types under aerobic condition is all controlled at 2.0-2.5mg/L; Adopt above-mentioned operation scheme to move continuously the system that stickiness sludge bulking occurs, sludge settling property is restored; Between continuous operating period, system is not carried out to spoil disposal, monitor SVI, extracellular polymeric or the Zeta potential value of mud every day, when the SVI of mud value is lower than 150ml/g, and in extracellular polymeric the ratio of protein quality concentration and polysaccharide mass concentration in the scope of 1-1.5 or Zeta potential between ± 10mv, think that stickiness sludge bulking problem solves, out of service and enter next step; In order to ensure treatment effect, and sludge activity is not caused damage, continuous operating time is defined as 2-8 days, moves at least continuously 2 days, is no more than at the most 8 days;
(3) improved system water inlet and operation scheme; After stickiness sludge bulking problem solves, whether should measure the former water inlet organic loading of system higher than 0.5Kg COD/Kg MLSS/d, if water inlet organic loading is worth higher than this, in operational process, by minimizing sludge volume or with the water outlet of Sewage Plant, dilute the mode of intaking, make into water organic loading lower than 0.5Kg COD/Kg MLSS/d; For sequence batch (system, adopt aerobic operation scheme after first anoxic, the time of anoxic, aerobic operation, controlling aerobic stage dissolved oxygen concentration was 2.0 ± 0.2mg/L than being 1:2-2:3; For continuous-flow system, adopt the preposition operation scheme of anoxic, anoxic and aerobic hydraulic detention time are than being 2:5-2:3, controlling aerobic stage dissolved oxygen concentration is 2.0 ± 0.2mg/L; If continuous-flow system is set up preposition anaerobic zone, anaerobism is 1:5-1:4 with aerobic hydraulic detention time ratio.
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| CN104710004B (en) * | 2015-03-27 | 2017-01-04 | 中蓝连海设计研究院 | Sewage disposal system second pond Mud up-floating early warning and control method |
| CN105036299B (en) * | 2015-08-05 | 2017-05-03 | 北京工业大学 | Sludge sedimentation optimization method for secondary sedimentation tank in sludge bulking system through biological nitrogen removal process |
| CN106927562A (en) * | 2017-02-27 | 2017-07-07 | 浙江大学 | A kind of method that aerobic particle mud stickiness expansion is repaired |
| CN112897680A (en) * | 2019-12-04 | 2021-06-04 | 江苏孚璋生物技术有限公司 | Continuous flow automatic domestic sewage treatment method |
| CN114804355A (en) * | 2022-03-10 | 2022-07-29 | 天津创业环保集团股份有限公司 | Device and method for improving sludge settling performance |
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| CN102616933A (en) * | 2012-04-11 | 2012-08-01 | 北京工业大学 | Filamentous sludge bulking recovery method based on non-nitrification A/O (anaerobic/aerobic) biological phosphorus removal process |
| CN103011419A (en) * | 2012-12-03 | 2013-04-03 | 北京工业大学 | Method for rapidly solving problem of filamentous bacteria sludge bulking through hunger treatment |
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| JPS621496A (en) * | 1985-06-26 | 1987-01-07 | Agency Of Ind Science & Technol | Two-stage microbiological treatment of organic dirty waste water |
| IL128621A (en) * | 1996-09-03 | 2002-02-10 | Nate Int | Modular filtration system |
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| CN102616933A (en) * | 2012-04-11 | 2012-08-01 | 北京工业大学 | Filamentous sludge bulking recovery method based on non-nitrification A/O (anaerobic/aerobic) biological phosphorus removal process |
| CN103011419A (en) * | 2012-12-03 | 2013-04-03 | 北京工业大学 | Method for rapidly solving problem of filamentous bacteria sludge bulking through hunger treatment |
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| JP昭62-1496A 1987.01.07 |
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Effective date of registration: 20201224 Address after: Room 23, Yinzhu street, Zhuyuan Road, East District, Zhongshan City, Guangdong Province 528403 Patentee after: ZHONGSHAN PUBLIC UTILITIES WATER Co.,Ltd. Address before: 100124 No. 100 Chaoyang District Ping Tian Park, Beijing Patentee before: Beijing University of Technology |
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