CN101348316A - Sludge pretreatment combined method - Google Patents
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- CN101348316A CN101348316A CNA2008100714063A CN200810071406A CN101348316A CN 101348316 A CN101348316 A CN 101348316A CN A2008100714063 A CNA2008100714063 A CN A2008100714063A CN 200810071406 A CN200810071406 A CN 200810071406A CN 101348316 A CN101348316 A CN 101348316A
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Abstract
The invention relates to the waste treatment technical field, in particular to a combined method used for sludge pretreatment. The combined method comprises the following steps that excess sludge generated during sewage treatment is adjusted to the appropriate concentration, pH value and temperature, and is conveyed to an ultrasonic/ozone reactor; and after treated with both ultrasonic wave and ozone, the excess sludge is finally conveyed to a sludge anaerobic digestion reactor so as to undergo post treatment or is directly dewatered to be made into agricultural fertilizer. The combined method has the advantages that the method applies ultrasonic wave and ozone to sludge pretreatment for the first time; after treatment, the dissolution rate of solid phase COD is between 5 and 35 percent, and the output of methane is increased by 50 to 75 percent; compared with treatment carried out through adopting ultrasonic wave or ozone independently, the removal rate of benzo [a] pyrene in the sludge can reach 4 to 10 percent, and energy consumption is reduced by 5 to 20 percent; therefore, the method reduces the cost in sludge treatment, and is suitable for the treatment of sludge in a sewage plant and a sewage treatment station; moreover, the method can be used in sludge pretreatment for manufacturing agricultural fertilizer, and has broad application prospect.
Description
Technical field
The present invention relates to the offal treatment technical field, be meant a kind of sludge pretreatment combined method especially.
Background technology
Along with the continuous progress of rapid economic development and society, people more and more pay attention to environmental problem, and wastewater treatment rate increases year by year.And, in treating processes, produced a large amount of excess sludges along with the coming into operation of large amount of sewage treatment plant and treatment station.Excess sludge water ratio height contains a large amount of pathogenic micro-organisms and bio-toxicity material, dehydration and stable difficulty, processing costs costliness.The disposal of excess sludge has become the bottleneck problem that all sewage works and treatment station current and expected future must be faced.
What generally adopt in the method for disposal of mud at present is anaerobic digestion, but as a kind of Sludge Disposal Techniques, also there are some defectives in anaerobic digestion: (1) speed of response is slow, and the residence time is long, and structures are bulky; (2) methane production is low, does not often reach the requirement of utilization.Therefore a lot of mud preconditioning techniques are developed, and by improving the shortcoming that sludge quality remedies anaerobic digestion, as ultrasonic wave, ozone, microwave, pyrolysis etc., but these mud preconditioning techniques mostly exist expense costliness or the lower defective of efficient.These shortcomings have seriously restricted applying of mud preconditioning technique.If the mud preconditioning technique is carried out coupling, make between the preconditioning technique and strengthen mutually, produce the effect of 1+1＞2, can improve pretreated efficient, reduce processing costs, for the mud preconditioning technique finally drops into the practical application blaze the trail.
At present ultrasonic wave/ozone combination treatment technology is mainly used in the organic substance of difficult degradation in the treating water, and this class material is mostly for containing the aromatics of benzene ring structure, as phenols etc., is difficult to be degraded by common biology, physics and chemical process.As Chinese patent application 200710067341.0 " a kind of technology of ultrasonic ozonize chlorophenol-containing wastewater ", Chinese patent application 200610151124.5 " organic method in the supersonic synergy ozone/comb ceramic catalyzing oxidizing degrading water " or the like for another example, ultrasonic wave does not directly act on process object substantially in treating processes, mainly pulverizing ozone bubbles by concussion accelerates the water-soluble speed of ozone, makes the more hydroxyl radical free radical of ozone generation come the degradation treatment object, the ultrasonic effect of mainly playing assisted and strengthened ozone effect; Also do not find the bibliographical information of ultrasonic wave/ozonize mud up to now.
Ultrasonic pretreatment mud mainly is to produce a large amount of cavitation bubbles by the ultrasonic wave effect, utilize high-temperature and high-pressure conditions in the cavitation bubble, the broken hydroxyl radical free radical effect that produces of cavitation bubble makes sludge crushing, thereby the molten born of the same parents' process of the hydrolysis of accelerate sludge improves anaerobic digestion speed.It is generally acknowledged ultrasonicly to be cut into the master with the cavitation bubble fragmentation, other effects are very small; Ozone pre-treatment mud is to decompose hydroxyl radical free radical and the mud effect that produces by ozone and ozone, the molten born of the same parents' process of accelerate sludge, and then accelerate anaerobic digestion process.This process depends primarily on the size of water-soluble speed of ozone and bubble.
At present restriction ultrasonication mud technology is that a large amount of solids in solid, the water mixture, particularly mud have limited hyperacoustic transmission mainly due to mud, and as stirring additionally is not provided, then its processing efficiency is not high, reach ideal effect and then consume energy higher; Ozonize mud technology cause processing efficiency lower, and ozoniferous energy consumption is higher mainly due to ozone low rate of diffusion in water, and these reasons have hindered their application in practice.
In addition, in mud, also contain a certain amount of persistence organic pollutant, as benzo [a] pyrene, benzo [a] pyrene is a kind of strong carcinogen, and bibliographical information is arranged, and is not carrying out under the pre-treatment situation, in anaerobic digestion reaction vessel, handled 30 days, and find no tangible clearance.
Summary of the invention
Main purpose of the present invention is to overcome in the prior art single with ultrasonic wave or ozone pre-treatment mud efficient is not high or energy consumption is higher shortcoming, and a kind of sludge pretreatment combined method of ultrasonic wave/ozone is provided.
The present invention adopts following technical scheme: a kind of sludge pretreatment combined method, comprise the steps: suitable concentration, pH value and the temperature of excess sludge furnishing with the sewage disposal generation, send in ultrasonic wave/ozone reactor, after ultrasonic wave/ozone acting in conjunction, finally send into and carry out subsequent disposal in the anaerobic sludge digestion reactor or directly make agricultural fertilizer after the dehydration.
Aforementioned a kind of sludge pretreatment combined method, described sludge concentration is controlled at 5～30gTS/L, and temperature of reaction is controlled at≤and 60 ℃, pH is controlled at 6.0～8.0.
Aforementioned a kind of sludge pretreatment combined method, described temperature of reaction and 〉=4 ℃.
Aforementioned a kind of sludge pretreatment combined method, described ozone dosage is controlled at 0.02～0.2g0
3/ gTS, every liter of mud air flow is controlled at 〉=0.1L/min.
Aforementioned a kind of sludge pretreatment combined method, described every liter of mud air flow and≤10L/min.
Aforementioned a kind of sludge pretreatment combined method, described ultrasonic energy input is controlled at 3000～20000kJ/kgTS, and ultrasonic frequency is controlled at 15～50kHz.
Aforementioned a kind of sludge pretreatment combined method, described ultrasonic wave/ozone reactor are circular reactor, and reactor bottom is an arc.
Aforementioned a kind of sludge pretreatment combined method, described ultrasonic wave/ozone reactor comprises that ozone discharges head or pipe and ultrasonic probe, ozone discharges head or pipe is positioned at reactor bottom, and is controlled at≤60cm with the ultrasonic probe distance, and the aperture that ozone discharges head or pipe is controlled at 50～300 μ m.
Aforementioned a kind of sludge pretreatment combined method, described ozone discharge head or pipe and ultrasonic probe apart from and 〉=1cm.
Aforementioned a kind of sludge pretreatment combined method, described circular reactor diameter/height ratio was controlled at 1: 1.5～1: 4.
Ultrasonic wave of the present invention/ozone sludge pretreatment combined method mainly is by smashing after the sewage disposal zoogloea structure of microorganism in the excess sludge, and make the fragmentation of part microorganism wall, intracellular matter is entered in the water, make finally that dissolved organic matter increases in the mud, and then the anaerobic digestion process of accelerate sludge.Ultrasonic wave and ozone both directly acted on mud respectively in sludge handling process, strengthened mutually again between the two.
The present invention adopts ultrasonic wave/ozone sludge pretreatment combined method, ultrasonic oscillation is pulverized ozone bubbles becomes microbubble, can improve the concentration of ozone in water-soluble speed of ozone and unit time, the cavitation bubble that ultrasonic wave produces has the characteristic of High Temperature High Pressure, impel ozone to decompose fast and produce more hydroxyl radical free radical, ultransonic cavitation effect makes ozone partially decomposed product O
2Form the stronger H of oxidisability
20
2Thereby, help the raising of ozonize mud efficient.And the microbubble of ozone is equivalent to provide a lot of cavitation nucleus for ultrasonic wave, make ultrasonic wave form more cavitation bubble, thereby improved the efficient of ultrasonication mud, ozone also plays the effect of stirring mud, do not need additionally to provide stirring, remedy the shortcoming that ultrasonic wave is transmitted to a certain extent in mud, reduced energy consumption.
By the above-mentioned description of this invention as can be known, compare with prior art, the present invention unites ultrasonic wave/ozone first and is used for the mud pre-treatment, improve anaerobic digestion performance of sludge, remove part persistence organic pollutant such as benzo [a] pyrene in the mud, improve the efficient of ozone, ultrasonication mud, and reduced energy consumption.The dissolution rate of handling back solid phase COD is 5～30%[dissolution rate=(handling back solvability COD value-initial dissolution COD value)/initial solid phase COD value * 100%], the bio-degradable performance improves 40～80%, the anaerobic sludge digestion time after the processing shortens 5～15 days, gas production rate improves 50～75%, and methane production improves 50～75%.Or ozonize ultrasonic with independent employing compared, benzo in the mud [a] pyrene clearance reaches 4～10%, reduced by 5～20% energy consumption, reduce the cost of sludge treatment, be applicable to the processing of sewage work and treatment station mud, and can be used for the pre-treatment that mud is produced agricultural fertilizer, have broad application prospects.
Embodiment
Because the various places sewage quality is different with the treatment process of being taked, the excess sludge character that produces is difference to some extent, and the parameter of the ultrasonic wave of different manufacturers and ozonizer and performance are distinguished to some extent, therefore under the prerequisite of essence of the present invention and claims scope, can suitably adjust parameters more of the present invention, to adapt to concrete situation.The invention will be further described below in conjunction with embodiment, but protection scope of the present invention is not limited in this:
Embodiment 1:
Xiamen sewage treatment plant residual mud, character is as follows: water ratio is 99.51%, sludge concentration is 5.16gTS/L, total COD is 5561mg/L, and solvability COD is 126.9mg/l, and volatile solid (VSS) is 72.25% of a total solids (TS), pH is 7.65, and temperature is 40 ℃.Get in the cylinder shape reaction flask that mud 400ml adds 1L, the reaction flask diameter: aspect ratio is 1: 4, and ozone discharges head and is positioned at reactor bottom, and with ultrasonic probe apart from 45cm, it is 80 μ m that ozone discharges an aperture.At ultrasonic frequency 21kHz, ultrasonic energy is input as 5500kJ/kgTS, and the ozone dosage is for being 0.04gO
3Under/gTS the condition, solvability COD becomes 461mg/L in the mud of processing back, and the dissolution rate of solid phase COD is 6.15%, and the bio-degradable performance improves 46.7%, can loss-rate reach ultrasonication reduction by 6.1% separately under the effect same condition, reduce by 9.64% than independent ozonize.
Embodiment 2:
Xiamen sewage treatment plant residual mud, character is as follows: water ratio is 98.97%, sludge concentration is 10.13gTS/L, total COD is 12090mg/L, and solvability COD is 255.8mg/l, and volatile solid (VSS) is 73.21% of a total solids (TS), pH is 6.2, and temperature is 6 ℃.Get in the cylinder shape reaction flask that mud 400ml adds 1L, the reaction flask diameter: aspect ratio is 1: 2, and ozone discharges head and is positioned at reactor bottom, and with ultrasonic probe apart from 10cm, it is 200 μ m that ozone discharges an aperture.At ultrasonic frequency 21kHz, ultrasonic energy is input as 8825kJ/kgTS, and the ozone dosage is for being 0.07gO
3Under/gTS the condition, solvability COD becomes 2065mg/L in the mud of processing back, and the dissolution rate of solid phase COD is 15.16%, and the bio-degradable performance improves 56.12%, can loss-rate reach ultrasonication reduction by 8.2% separately under the effect same condition, reduce by 13.1% than independent ozonize.
Embodiment 3:
Xiamen sewage treatment plant residual mud, character is as follows: water ratio is 98.01%, sludge concentration is 20.19gTS/L, total COD is 25143mg/L, and solvability COD is 372.3mg/l, and volatile solid (VSS) is 74.18% of a total solids (TS), pH is 6.89, and temperature is 30 ℃.Get in the cylinder shape reaction flask that mud 400ml adds 1L, the reaction flask diameter: aspect ratio is 1: 3, and ozone discharges head and is positioned at reactor bottom, and with ultrasonic probe apart from 15cm, it is 300 μ m that ozone discharges an aperture.At ultrasonic frequency 21kHz, ultrasonic energy is input as 17500kJ/kgTS, and the ozone dosage is for being 0.15gO
3Under/gTS the condition, solvability COD becomes 6607mg/L in the mud of processing back, and the dissolution rate of solid phase COD is 25.17%, and the bio-degradable performance improves 76.2%, can loss-rate reach ultrasonication reduction by 12.21% separately under the effect same condition, reduce by 18.42% than independent ozonize.
Embodiment 4:
Ultrasonic wave/ozone among the embodiment 1 is united pretreated mud is used for Anaerobic Digestion, and with without the contrast of pretreated mud.It is 35 ℃ that the digestion temperature is adopted in anaerobic digestion, and seed sludge is a mud in sewage work's anaerobic digestor, and other conditions are identical with conventional anaerobic digestion.Ultrasonic wave/ozone was united pretreated anaerobic sludge digestion 18 days, gas production rate, methane production and fair substantially without pretreated sludge digestion 28 days.And at 2 kinds of mud all under 24 days the condition of anaerobic digestion, and compare gas production rate without pretreated mud and improve 58.9%, methane production improves 58.92%.
Embodiment 5:
Ultrasonic wave/ozone among the embodiment 2 is united pretreated mud is used for Anaerobic Digestion, and with without the contrast of pretreated mud.It is 35 ℃ that the digestion temperature is adopted in anaerobic digestion, and seed sludge is a mud in sewage work's anaerobic digestor, and other conditions are identical with conventional anaerobic digestion.Ultrasonic wave/ozone was united pretreated anaerobic sludge digestion 15 days, gas production rate, methane production and fair substantially without pretreated sludge digestion 28 days.And at 2 kinds of mud all under 24 days the condition of anaerobic digestion, and compare gas production rate without pretreated mud and improve 65.4%, methane production improves 65.41%.
Embodiment 6:
Ultrasonic wave/ozone among the embodiment 3 is united pretreated mud is used for Anaerobic Digestion, and with without the contrast of pretreated mud.It is 35 ℃ that the digestion temperature is adopted in anaerobic digestion, and seed sludge is a mud in sewage work's anaerobic digestor, and other conditions are identical with conventional anaerobic digestion.Ultrasonic wave/ozone was united pretreated anaerobic sludge digestion 13 days, gas production rate, methane production and fair substantially without pretreated sludge digestion 28 days.And at 2 kinds of mud all under 24 days the condition of anaerobic digestion, and compare gas production rate without pretreated mud and improve 74.3%, methane production improves 74.24%.
Embodiment 7:
Identical with embodiment 2 conditions, after ultrasonic wave/ozonize, benzo [a] pyrene clearance reaches 4.14%, and ultrasonic wave or ozone act on separately, and this nothing of benzo [a] pyrenyl is removed.
Embodiment 8:
Identical with embodiment 3 conditions, after ultrasonic wave/ozonize, benzo [a] pyrene clearance reaches 6.52%, and ultrasonic wave or ozone act on separately, and this nothing of benzo [a] pyrenyl is removed.
Above-mentioned only is several embodiment of the present invention, but design concept of the present invention is not limited thereto, and allly utilizes this design that the present invention is carried out the change of unsubstantiality, all should belong to the behavior of invading protection domain of the present invention.
Claims (10)
1, a kind of sludge pretreatment combined method, it is characterized in that comprising the steps: suitable concentration, pH value and the temperature of excess sludge furnishing that sewage disposal is produced, send in ultrasonic wave/ozone reactor, after ultrasonic wave/ozone acting in conjunction, finally send into and carry out subsequent disposal in the anaerobic sludge digestion reactor or directly make agricultural fertilizer after the dehydration.
2, a kind of sludge pretreatment combined method as claimed in claim 1, it is characterized in that: described sludge concentration is controlled at 5～30gTS/L, and temperature of reaction is controlled at≤and 60 ℃, pH is controlled at 6.0～8.0.
3, a kind of sludge pretreatment combined method as claimed in claim 2 is characterized in that: described temperature of reaction and 〉=4 ℃.
4, as claim 1 or 2 or 3 described a kind of sludge pretreatment combined methods, it is characterized in that: described ozone dosage is controlled at 0.02～0.2gO
3/ gTS, every liter of mud air flow is controlled at 〉=0.1L/min.
5, a kind of sludge pretreatment combined method as claimed in claim 4 is characterized in that: described every liter of mud air flow and≤10L/min.
6, as claim 1 or 2 or 3 described a kind of sludge pretreatment combined methods, it is characterized in that: described ultrasonic energy input is controlled at 3000～20000kJ/kgTS, and ultrasonic frequency is controlled at 15～50kHz.
7, a kind of sludge pretreatment combined method as claimed in claim 1 is characterized in that: described ultrasonic wave/ozone reactor is a circular reactor, and reactor bottom is an arc.
8, as claim 1 or 7 described a kind of sludge pretreatment combined methods, it is characterized in that: described ultrasonic wave/ozone reactor comprises that ozone discharges head or pipe and ultrasonic probe, ozone discharges head or pipe is positioned at reactor bottom, and be controlled at≤60cm with ultrasonic probe distance, the aperture that ozone discharges head or pipe is controlled at 50～300 μ m.
9, a kind of sludge pretreatment combined method as claimed in claim 8 is characterized in that: described ozone discharge head or pipe and ultrasonic probe apart from and 〉=1cm.
10, a kind of sludge pretreatment combined method as claimed in claim 7 is characterized in that: described circular reactor diameter/height ratio was controlled at 1: 1.5～1: 4.
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| CN102180577A (en) * | 2011-03-17 | 2011-09-14 | 南海发展股份有限公司 | Method for decrement pretreatment of excessive sludge by coupling ultrasonic waves/chlorine dioxide |
| CN102249411A (en) * | 2011-05-17 | 2011-11-23 | 中国科学技术大学 | Method for optimizing sewage treatment process |
| CN102424507A (en) * | 2011-10-25 | 2012-04-25 | 南开大学 | Method for utilizing enhanced pretreatment to promote anaerobic digestion of excess sludge |
| CN102424506A (en) * | 2011-10-25 | 2012-04-25 | 南开大学 | Method for promoting anaerobic digestion of excess sludge through pretreatment of ultrasonic waves and hydrogen peroxide |
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| CN102249411A (en) * | 2011-05-17 | 2011-11-23 | 中国科学技术大学 | Method for optimizing sewage treatment process |
| CN102249411B (en) * | 2011-05-17 | 2013-06-26 | 中国科学技术大学 | Method for optimizing sewage treatment process |
| CN102424507A (en) * | 2011-10-25 | 2012-04-25 | 南开大学 | Method for utilizing enhanced pretreatment to promote anaerobic digestion of excess sludge |
| CN102424506A (en) * | 2011-10-25 | 2012-04-25 | 南开大学 | Method for promoting anaerobic digestion of excess sludge through pretreatment of ultrasonic waves and hydrogen peroxide |
| CN103508617A (en) * | 2012-06-27 | 2014-01-15 | 中国石油化工股份有限公司 | Method for reducing petrochemical biological sludge and treatment device for petrochemical biological sludge |
| CN103508617B (en) * | 2012-06-27 | 2015-08-19 | 中国石油化工股份有限公司 | The method of petrochemical industry reducing biological sludge and treatment unit thereof |
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| CN106396327A (en) * | 2015-08-03 | 2017-02-15 | 林知谚 | Biological sludge cell-lysing reaction system |
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Effective date of registration: 20101213 Address after: 361021 No. 1799, Jimei Avenue, Xiamen Applicant after: Institute of Urban Environment, Chinese Academy of Sciences Address before: 361003 No. 2 Tiger Road, Xiamen, Fujian Applicant before: Xiamen City Environment Institute |
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Effective date of registration: 20211223 Address after: Room 9006, 9th floor, No.1 building, science and Technology Park, Sangtian Island, No.1 Huayun Road, Suzhou Industrial Park, 215000, Jiangsu Province Patentee after: SUZHOU QINGRAN ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Address before: 361021 No. 1799, Jimei Avenue, Xiamen, Fujian Patentee before: INSTITUTE OF URBAN ENVIRONMENT, CHINESE ACADEMY OF SCIENCES |