CN109761461B - Method for treating excess sludge by using microorganisms - Google Patents
Method for treating excess sludge by using microorganisms Download PDFInfo
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- CN109761461B CN109761461B CN201910198309.9A CN201910198309A CN109761461B CN 109761461 B CN109761461 B CN 109761461B CN 201910198309 A CN201910198309 A CN 201910198309A CN 109761461 B CN109761461 B CN 109761461B
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Abstract
The method comprises the steps of dehydrating the residual sludge, adding a surfactant, adjusting the pH to 6-8, adding a microbial inoculum for fermentation, adding chitosan after the fermentation is finished, performing centrifugal separation, and feeding the centrifugate into a sewage treatment plant for treatment. The method optimizes the optimal strain combination, improves the degradation efficiency of the excess sludge, has high efficiency, solves the problems of difficult harmlessness, reduction and resource utilization of the excess sludge, has short treatment period, short fermentation time of only 8-10 days and low cost, can not cause the problem of excessive dosing strictly according to the implementation of the method, does not need to add excessive reagents in the treatment process, has better economic benefit and environmental benefit, has good dehydration effect, can reduce the water content of the sludge to below 9 percent after treatment, has harmless treatment method, low cost, simple operation method and strong practicability, has only trace substances such as macromolecular lignin, cellulose, harmful metals and the like in the treated sludge, has little pollution to the environment, and is worthy of market popularization and application.
Description
Technical Field
The invention belongs to the technical field of environmental management, and particularly relates to a method for treating excess sludge by using microorganisms.
Background
With the development of industry, the composition of sludge has become more and more complex. Some organic substances and toxic substances which are difficult to degrade need to be treated by a microorganism method, and the sludge has the conditions for the growth and the propagation of the microorganisms, so that the microorganisms can obtain nutrients from the sludge and degrade and utilize harmful substances simultaneously, thereby purifying the sludge.
At present, the traditional sludge treatment process still has the technical problems of low treatment process efficiency, overlarge dosage, poor dehydration effect, incapability of achieving harmlessness, complex treatment method, high cost, single microbial treatment variety, incapability of achieving harmlessness, reduction and recycling, and the treated sludge still has macromolecular lignin, cellulose, harmful heavy metals and the like which are difficult to absorb as a fertilizer.
Disclosure of Invention
The invention aims to provide a method for treating excess sludge by using microorganisms.
The aim of the invention is realized by the following technical measures:
a method for treating excess sludge by using microorganisms is characterized in that: the method comprises the steps of firstly carrying out dehydration pretreatment on excess sludge, then adding a surfactant for treatment, adding a pH regulator for regulating the pH value of the sludge to 6-8, adding a microbial inoculum for fermentation treatment, adding chitosan after fermentation is finished, standing for 24-36 hours, carrying out centrifugal separation, sending centrifuged liquid into a sewage treatment plant for treatment, and taking centrifugal precipitate after centrifugal separation to be mixed into conventional soil as an available solid fertilizer.
Further, the dewatering pretreatment is to place the residual sludge in a high-speed tubular centrifuge, set the centrifugal rotation speed at 6000-8000 r/min, carry out centrifugal dewatering, and carry out cyclic centrifugation for 2-3 times, so that the water content of the sludge is 70-75%.
Further, the surfactant is sodium dodecyl sulfate, and the mass ratio of the excess sludge to the surfactant is 1: 0.05-0.09.
Further, the pH adjusting agent is 1mol/L sodium hydroxide or 0.1mol/L hydrochloric acid.
Further, the microbial inoculum is prepared by mixing a bacillus subtilis microbial inoculum, a filamentous microbial inoculum, an aspergillus niger microbial inoculum, a thermomyces lanuginosus microbial inoculum and a erythrobacter longissimum microbial inoculum.
Further, the mass ratio of the bacillus subtilis microbial inoculum, the filamentous microbial inoculum, the aspergillus niger microbial inoculum, the thermomyces lanuginosa microbial inoculum to the erythromyces longissima microbial inoculum is 6-10: 1-8: 5-10; the mass ratio of the excess sludge to the microbial inoculum is 100: 5-10.
Further, the bacillus subtilis is CGMCC 1.12938; the filamentous fungus is CGMCC 1.15179; the Aspergillus niger is CGMCC 3.13901; the thermomyces lanuginosa is CCTCC AF 200043; the erythrobacterium longissima is GDMCC, and the number GIM 1.491.
Further, the fermentation is to add a microbial inoculum into the residual sludge after the pH is adjusted, then place the residual sludge into a fermentation reaction tank, introduce oxygen, control the oxygen pressure to be 0.05-0.08 MPa, control the temperature to be 35-40 ℃, and ferment for 8-10 days.
Further, the mass ratio of the excess sludge to the chitosan is 1: 0.003-0.008.
Furthermore, the rotating speed of the centrifugal separation centrifuge is 12000-15000 r/min, and the centrifugation time is 10-15 min.
The invention has the following beneficial effects:
the method has the advantages that the optimal strain combination is selected, the optimal strain proportion is selected, the degradation efficiency of the excess sludge is greatly improved, the treatment process efficiency is high, the technical problems of difficult harmlessness, reduction and resource utilization of the excess sludge are solved, the treatment period is short, the fermentation time is short, the fermentation process can be completed only 8-10 days, the cost is low, the fermentation process can be completed strictly according to the formula and the process, the problem of excessive added drugs is avoided, excessive chemical reagents are not required to be added in the treatment process, the economic benefit and environmental benefit are good, the dehydration effect is good, the water content of the sludge can be reduced to be below 9% after the treatment is finished, the treatment method is harmless, the cost is low, the operation method is simple and strong in practicability, the treated sludge only contains trace substances such as macromolecular lignin, cellulose, harmful metals and the like, the environmental pollution is small, and the method is worthy of market popularization and application.
Detailed Description
The present invention will now be described in detail by way of examples, and it should be understood that the following examples are illustrative only and are not to be construed as limiting the scope of the invention, as the invention extends to other variations, modifications and substitutions of the methods, steps or conditions disclosed herein, which fall within the scope of the invention.
Example 1
A method for treating excess sludge by using microorganisms comprises the steps of placing 100kg of excess sludge of a paper mill in a high-speed tubular centrifuge, setting the centrifugal rotation speed to 7000r/min, carrying out centrifugal dehydration, carrying out cyclic centrifugation for 2 times to enable the water content of the sludge to be 73%, then adding 8kg of ammonium dodecyl sulfate, mixing and stirring at the stirring rotation speed of 20r/min for 2 hours, standing after stirring is finished, then adding 1mol/L of sodium hydroxide to adjust the pH of a solution to be 7.08, then adding 7kg of microbial inoculum (the mass ratio of bacillus subtilis microbial inoculum, filamentous microbial inoculum, aspergillus niger microbial inoculum, thermomyces lanuginosus microbial inoculum to the erythrobacterium inoculum is 8:8:5:6: 7), then placing in a fermentation reaction tank, introducing oxygen, controlling the oxygen pressure to be 0.07MPa, controlling the temperature to be 38 ℃, fermenting for 9 days, adding 0.6kg of chitosan after fermentation, stirring and standing for 32 hours, and then placing the sludge in a centrifuge, setting the centrifugal rotation speed to 13000r/min, centrifuging for 12min, after the centrifugation is finished, directly sending the centrifugate to a sewage treatment plant for conventional treatment, collecting the centrifugal precipitate, placing the precipitate in a drying box, setting the temperature to be 70 ℃, and drying for 38 hours to ensure that the moisture of the sludge is lower than 9 percent, and mixing the sludge into conventional soil to be used as fertilizer.
Example 2:
a method for treating excess sludge by using microorganisms comprises the steps of placing 100kg of excess sludge of a chemical plant in a high-speed tubular centrifuge, setting the centrifugal rotation speed to 8000r/min, carrying out centrifugal dehydration, carrying out cyclic centrifugation for 2 times to enable the water content of the sludge to be 70%, then adding 9kg of ammonium dodecyl sulfate, mixing and stirring at the stirring rotation speed of 20r/min for 2 hours, standing after stirring is finished, then adding 1mol/L of sodium hydroxide to adjust the pH of a solution to be 7.08, then adding 10kg of microbial inoculum (the mass ratio of bacillus subtilis microbial inoculum, filamentous microbial inoculum, aspergillus niger microbial inoculum, thermomyces lanuginosus microbial inoculum to erythrobacter agents is 10:10:1:8: 10), then placing in a fermentation reaction tank, introducing oxygen, controlling the oxygen pressure to be 0.05MPa, controlling the temperature to be 35 ℃, fermenting for 8 days, adding 0.6kg of chitosan after fermentation, stirring and standing for 32 hours, and then placing the sludge in a centrifuge, setting the centrifugal rotation speed to 13000r/min, centrifuging for 12min, after the centrifugation is finished, directly sending the centrifugate to a sewage treatment plant for conventional treatment, collecting the centrifugal precipitate, placing the precipitate in a drying box, setting the temperature to be 70 ℃, and drying for 38 hours to ensure that the moisture of the sludge is lower than 9 percent, and mixing the sludge into conventional soil to be used as fertilizer.
Example 3:
a method for treating excess sludge by using microorganisms comprises the steps of putting 100kg of municipal excess sludge into a high-speed tubular centrifuge, setting the centrifugal rotation speed to be 6000r/min, carrying out centrifugal dehydration, carrying out cyclic centrifugation for 3 times to enable the water content of the sludge to be 72%, then adding 5kg of ammonium dodecyl sulfate, mixing and stirring at the stirring rotation speed of 20r/min for 2 hours, standing after stirring is finished, then adding 1mol/L of sodium hydroxide to adjust the pH value of a solution to be 7.08, then adding 5kg of microbial agents (the mass ratio of bacillus subtilis microbial agents, filamentous microbial agents, aspergillus niger microbial agents, thermomyces lanuginosus microbial agents and erythromyces longissimus microbial agents is 6:6:7:8: 5), then putting into a fermentation reaction tank, introducing oxygen, controlling the oxygen pressure to be 0.08MPa, controlling the temperature to be 40 ℃, fermenting for 10 days, adding 0.6kg of chitosan after fermentation, stirring and uniformly mixing, standing for 32 hours, and then placing the sludge in a centrifuge, setting the centrifugal rotation speed to 13000r/min, centrifuging for 12min, after the centrifugation is finished, directly sending the centrifugate to a sewage treatment plant for conventional treatment, collecting the centrifugal precipitate, placing the precipitate in a drying box, setting the temperature to be 70 ℃, and drying for 38 hours to ensure that the moisture of the sludge is lower than 9 percent, and mixing the sludge into conventional soil to be used as fertilizer.
Claims (5)
1. A method for treating excess sludge by using microorganisms is characterized in that: firstly, carrying out dehydration pretreatment on excess sludge, then adding a surfactant for treatment, adding a pH regulator for regulating the pH value of the sludge to 6-8, adding a microbial inoculum for fermentation treatment, adding chitosan after the fermentation is finished, standing for about 24-36 hours, carrying out centrifugal separation, sending centrifuged liquid into a sewage treatment plant for treatment, and taking centrifugal precipitate as available solid fertilizer after the centrifugal separation and mixing the solid fertilizer into conventional soil; the surfactant is sodium dodecyl sulfate, the mass ratio of the excess sludge to the surfactant is 1: 0.05-0.09, the mass ratio of the excess sludge to the chitosan is 1: 0.003-0.008, the microbial inoculum is formed by mixing a bacillus subtilis microbial inoculum, a filamentous bacterium microbial inoculum, an aspergillus niger microbial inoculum, a thermomyces lanuginosa microbial inoculum and a erythrorhizobium elongatum microbial inoculum, and the mass ratio of the bacillus subtilis microbial inoculum, the filamentous bacterium microbial inoculum, the aspergillus niger microbial inoculum, the thermomyces lanuginosa microbial inoculum and the erythrorhizobium elongatum microbial inoculum is 6-10: 1-8: 5-10; the mass ratio of the excess sludge to the microbial inoculum is 100: 5-10, the bacillus subtilis is CGMCC and is numbered 1.12938; the filamentous fungus is CGMCC with the number of 1.15179; the Aspergillus niger is CGMCC with the number of 3.13901; the thermomyces lanuginosus is CCTCC with the number of CCTCC AF 200043; the erythrobacterium longissima is GDMCC, and the number GIM 1.491.
2. The method for treating excess sludge using microorganisms according to claim 1, wherein: the dewatering pretreatment is to place the residual sludge in a high-speed tubular centrifuge, set the centrifugal rotation speed at 6000-8000 r/min, carry out centrifugal dewatering, and carry out cyclic centrifugation for 2-3 times, so that the water content of the sludge is 70-75%.
3. The method for treating excess sludge using microorganisms according to claim 2, wherein: the pH regulator is 1mol/L sodium hydroxide or 0.1mol/L hydrochloric acid.
4. The method for treating excess sludge using microorganisms according to claim 3, wherein: the fermentation is to add a microbial inoculum into the residual sludge after the pH is adjusted, then place the residual sludge in a fermentation reaction tank, introduce oxygen, control the oxygen pressure to be 0.05-0.08 MPa, control the temperature to be 35-40 ℃, and ferment for 8-10 days.
5. The method for treating excess sludge using microorganisms according to claim 4, wherein: the rotating speed of the centrifugal separation centrifuge is 12000-15000 r/min, and the centrifugation time is 10-15 min.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1814764A (en) * | 2005-11-17 | 2006-08-09 | 同济大学 | Method for promoting sludge to produce organic acid utilizing surface active agent |
| KR20120105628A (en) * | 2011-03-16 | 2012-09-26 | (주)워터풀 | Sludge Reduction by Combined Fermentation and Reconstruction Method |
| CN104743760A (en) * | 2015-03-09 | 2015-07-01 | 同济大学 | Method for synchronously implementing sludge strengthened dewatering and increasing bio-adsorbent yield |
| CN105016600A (en) * | 2015-07-03 | 2015-11-04 | 天津霍普环保科技有限公司 | Sludge biological drying method |
| CN108911859A (en) * | 2018-08-10 | 2018-11-30 | 重庆文理学院 | A kind of preparation method of middle microelement microorganism fertilizer |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1814764A (en) * | 2005-11-17 | 2006-08-09 | 同济大学 | Method for promoting sludge to produce organic acid utilizing surface active agent |
| KR20120105628A (en) * | 2011-03-16 | 2012-09-26 | (주)워터풀 | Sludge Reduction by Combined Fermentation and Reconstruction Method |
| CN104743760A (en) * | 2015-03-09 | 2015-07-01 | 同济大学 | Method for synchronously implementing sludge strengthened dewatering and increasing bio-adsorbent yield |
| CN105016600A (en) * | 2015-07-03 | 2015-11-04 | 天津霍普环保科技有限公司 | Sludge biological drying method |
| CN108911859A (en) * | 2018-08-10 | 2018-11-30 | 重庆文理学院 | A kind of preparation method of middle microelement microorganism fertilizer |
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Effective date of registration: 20230801 Address after: Building 1, No. 96-3 Torch Avenue, Erlang Science and Technology New City, Jiulongpo District, Chongqing 400039 Patentee after: Chongqing Paige Clean Technology Co.,Ltd. Address before: 401331 No.151, south 2nd Road, Huxi University, Shapingba District, Chongqing Patentee before: CHONGQING CITY MANAGEMENT College |