CN105502870A - Zero-valent iron strengthened sludge anaerobic pre-reaction device and sludge pretreatment method - Google Patents
Zero-valent iron strengthened sludge anaerobic pre-reaction device and sludge pretreatment method Download PDFInfo
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Abstract
The invention relates to a zero-valent iron strengthened sludge anaerobic pre-reaction device and a sludge pretreatment method. The pre-reaction device consists of: a sludge transfer pump, a zero-valent iron filler storage bin, a tubular screw conveyor, a feeding machine, a zero-valent iron strengthened pre-reactor and a stirrer. The sludge transfer pump, the zero-valent iron filler storage bin, the tubular screw conveyor, the feeding machine and the zero-valent iron strengthened pre-reactor form a closed system and are in seal connection with each other. The zero-valent iron strengthened pre-reactor is cylindrical overall, the top is provided with the stirrer, and the stirrer bottom is provided with a discharge apparatus. The device has the characteristics of simple structure and convenient operation and maintenance. By adding the zero-valent iron strengthened pretreatment device link, sludge reduction can be effectively promoted, and the follow-up sludge anaerobic digestion efficiency and methane production can be improved, thus being conducive to saving the operation cost. At the same time, methane belongs to clean energy, can produce economic value, and is energy saving and environment-friendly.
Description
Technical field
The present invention relates to a kind of pre-reaction device and treatment process technical field thereof, especially a kind of Zero-valent Iron reinforcement sludge anaerobism pre-reaction device and sludge pre-treatment method.
Background technology
Excess sludge utilizes the waste produced in Wastewater Treated by Activated Sludge Process municipal wastewater process.Along with growth and the economic fast development of China's size of population, water pollution problems is on the rise, and a large amount of behave of building sewage work and having become inevitable, so high sewage load, must cause the increase of surplus sludge volume.The current whole nation is not yet ripe for the treatment and disposal technology of excess sludge, and only have the Sewage Plant less than 1/3 to have excess sludge stabilizing treatment facility, the municipal sludge of more than 90% is dealt carefully with, and mud secondary pollution phenomenon is very general.The process investment of excess sludge and working cost huge, account for greatly whole sewage work investment and working cost 30% ~ 70%, bring white elephant to municipal sewage plant.
Utilize anaerobic digestion techniques process excess sludge can reach mud decrement and raw methanogenic object simultaneously.But, the general fermentation efficiency of conventional anaerobic digestion process is lower, result in residence time length, mud decrement rate is low, in order to overcome these shortcomings, usually need to use some preprocessing means to promote the decomposition of mud, as added acid-alkali treatment, thermal treatment, microwave treatment etc., but all cost is high, energy consumption is large because these class methods are general, therefore be difficult to effectively be promoted, people are still in the searching one more cheap fermentation of sludge anaerobic easily promotion method.
Zero-valent Iron, as a kind of reductibility material cheap and easy to get, has been widely used in sewage disposal, ground water cleaning and soil remediation.Zero-valent Iron can reduce the redox potential (ORP) of system, Zero-valent Iron is joined in anaerobic system, the anaerobic environment that one is more conducive to microorganism growth can be created, the efficiency that organism is converted into voltaile fatty acid and methane can be significantly improved.In addition, Zero-valent Iron can also make propionic acid production declining, because lower oxidation reduction potential can suppress propionic acid type fermentation.
Summary of the invention
In order to overcome above-mentioned technological deficiency, the invention provides a kind of Zero-valent Iron reinforcement sludge anaerobism pre-reaction device and sludge pre-treatment method, this apparatus structure is simple, only need set up a pre-reaction device link in existing anaerobic digestion reaction vessel front end, just greatly can increase excess sludge anaerobic digestion efficiency, by the treatment process of this device to mud, the minimizing of mud can be promoted, improve the methane production of anaerobic sludge digestion technique simultaneously, methane as clean energy, energy-conserving and environment-protective.
A kind of Zero-valent Iron reinforcement sludge anaerobism pre-reaction device, comprising: sludge delivery pump, Zero-valent Iron filler storage bin, tube-type spiral conveyer and feeding machine, Zero-valent Iron strengthening pre-reactor, agitator;
Described sludge delivery pump, Zero-valent Iron filler storage bin, tube-type spiral conveyer and feeding machine and Zero-valent Iron strengthening pre-reactor are closed system, and employing is tightly connected, and can ensure the anaerobic environment in pre-reactor, stops the intervention of oxygen;
Described tube-type spiral conveyer and feeding machine use carbon steel manufacture, include tubulose cell body, flange, screw-blade, bearing and gear motor.Tube-type spiral conveyer is connected with the top of strengthening pre-reactor bottom Zero-valent Iron filler storage bin with Zero-valent Iron by flange respectively with feeding machine, composition closed system, Zero-valent Iron filler strengthens pre-reactor charging once by tube-type spiral conveyer and the every 4h of feeding machine to Zero-valent Iron, and each inlet amount is the 2%-5% of sewage sludge feed amount.
Described Zero-valent Iron strengthening pre-reactor entirety is cylindrical, top is furnished with agitator, by the mechanical stirring of agitator, Zero-valent Iron is fully mixed in pre-reactor with mud, improve the reaction efficiency of Zero-valent Iron simultaneously, reactor bottom is provided with dumping device, is delivered in follow-up anaerobic digestor by the mix products of reacted Zero-valent Iron and mud.
Illustrate as one, in order to ensure the pressure equilibrium of whole pre-reaction device, safety valve is equipped with at described Zero-valent Iron strengthening pre-reactor top, when finding that internal pressure is too high, can open the safety-valve, the pressed gas of device inside be discharged, ensures the security of whole reaction unit.
One as preferred embodiment illustrates,
A kind of sludge pre-treatment method:
First, the mud in reception tank pumps in Zero-valent Iron strengthening pre-reactor by sludge pump, and conveying adopts semi continuous mode, and within every 4 hours, in pre-reactor, carry quantitative mud, the solid content of supplied materials mud controls between 5%-15%;
Secondly, Zero-valent Iron filler is quantitatively added to Zero-valent Iron strengthening pre-reactor by tube-type spiral conveyer and feeding machine bottom Zero-valent Iron filler storage bin, to the charging of Zero-valent Iron strengthening pre-reactor once, the dosing ratio of Zero-valent Iron filler and mud controls between 2%-5% every 4h;
Again, mud and Zero-valent Iron filler carry out mechanical stirring by the agitator at pre-reactor top, make Zero-valent Iron filler fully contact mixing with mud, and in pre-reactor, the mixing of mud and Zero-valent Iron filler and reaction times control at 3h.Zero-valent Iron strengthening pre-reactor is closed anaerobic system, Zero-valent Iron filler, as a kind of reductive agent of cheapness, be combined with anaerobic system and can accelerate organic hydrolysis and acidifying, its mechanism is by reducing redox potential (ORP), creating the anaerobic environment that is more conducive to microorganism growth.Simultaneously by the pre-reactor that Zero-valent Iron is strengthened, can improve the methane phase efficiency of follow-up anaerobic sludge digestion, its principle is: first, and Zero-valent Iron can improve the activity of acidication enzyme, promotes that the hydrolysis Sum decomposition of solid sludges becomes short chain fatty acid; Secondly, Zero-valent Iron energy enrichment consumption hydrogen microorganism, comprise homoacetogenic bacteria and consumption producing hydrogen and methane bacterium, the hydrogen partial pressure making system remain lower, is conducive to methanogenic carrying out.
Finally, the mixture of reacted mud and Zero-valent Iron filler is delivered to follow-up anaerobic digestion device by the dumping device of reactor bottom.
Beneficial aspects of the present invention is: this apparatus structure is simple, operation, easy to maintenance, by setting up this Zero-valent Iron strenuous primary treatment device link, effectively can promote the minimizing of mud, improve anaerobic digestion efficiency and the methane production of follow-up mud, reduce the processing cost of mud, methane belongs to clean energy simultaneously, can produce economic worth energy-conserving and environment-protective again.
Accompanying drawing explanation
Fig. 1 is a kind of structure principle chart of Zero-valent Iron reinforcement sludge anaerobism pre-reaction device
Fig. 2 is a kind of method flow block diagram of preferred embodiment of sludge pre-treatment method
Embodiment
Below in conjunction with accompanying drawing to a preferred embodiment of the present invention will be described in detail.
With reference to shown in Fig. 1, a kind of Zero-valent Iron reinforcement sludge anaerobism pre-reaction device, comprising: sludge delivery pump 101, Zero-valent Iron filler storage bin 102, tube-type spiral conveyer 103 and feeding machine 104, Zero-valent Iron strengthening pre-reactor 105, agitator 106;
Described sludge delivery pump 101, Zero-valent Iron filler storage bin 102, tube-type spiral conveyer 103 and feeding machine 104 and Zero-valent Iron strengthening pre-reactor 105 are closed system, employing is tightly connected, the anaerobic environment in pre-reactor can be ensured, stop the intervention of oxygen;
Described tube-type spiral conveyer 103 and feeding machine 104 use carbon steel manufacture, include tubulose cell body, flange, screw-blade, bearing and gear motor.Tube-type spiral conveyer 103 is connected with the top of strengthening pre-reactor 105 bottom Zero-valent Iron filler storage bin 102 with Zero-valent Iron by flange respectively with feeding machine 104, composition closed system, Zero-valent Iron filler strengthens pre-reactor 105 charging once by tube-type spiral conveyer 103 and the every 4h of feeding machine 104 to Zero-valent Iron, and each inlet amount is the 2%-5% of sewage sludge feed amount;
Described Zero-valent Iron strengthening pre-reactor 105 entirety is cylindrical, top is furnished with agitator 106, by the mechanical stirring of agitator 106, Zero-valent Iron is fully mixed in pre-reactor 105 with mud, improve the reaction efficiency of Zero-valent Iron simultaneously, be provided with dumping device bottom reactor 105, the mix products of reacted Zero-valent Iron and mud is delivered in follow-up anaerobic digestor.
Illustrate as one, in order to ensure the pressure equilibrium of whole pre-reaction device, safety valve is equipped with at described Zero-valent Iron strengthening pre-reactor 105 top, when finding that internal pressure is too high, can open the safety-valve, the pressed gas of device inside be discharged, ensures the security of whole reaction unit.
Illustrate as one, with reference to shown in Fig. 2,
A kind of sludge pre-treatment method:
First, the mud in reception tank pumps in Zero-valent Iron strengthening pre-reactor by sludge pump, and conveying adopts semi continuous mode, and within every 4 hours, in pre-reactor, carry quantitative mud, the solid content of supplied materials mud controls between 5%-15%;
Secondly, Zero-valent Iron filler is quantitatively added to Zero-valent Iron strengthening pre-reactor by tube-type spiral conveyer and feeding machine bottom Zero-valent Iron filler storage bin, to the charging of Zero-valent Iron strengthening pre-reactor once, the dosing ratio of Zero-valent Iron filler and mud controls between 2%-5% every 4h;
Again, mud and Zero-valent Iron filler carry out mechanical stirring by the agitator at pre-reactor top, make Zero-valent Iron filler fully contact mixing with mud, and in pre-reactor, the mixing of mud and Zero-valent Iron filler and reaction times control at 3h.Zero-valent Iron strengthening pre-reactor is closed anaerobic system, Zero-valent Iron filler, as a kind of reductive agent of cheapness, be combined with anaerobic system and can accelerate organic hydrolysis and acidifying, its mechanism is by reducing redox potential (ORP), creating the anaerobic environment that is more conducive to microorganism growth.Simultaneously by the pre-reactor that Zero-valent Iron is strengthened, can improve the methane phase efficiency of follow-up anaerobic sludge digestion, its principle is: first, and Zero-valent Iron can improve the activity of acidication enzyme, promotes that the hydrolysis Sum decomposition of solid sludges becomes short chain fatty acid; Secondly, Zero-valent Iron energy enrichment consumption hydrogen microorganism, comprise homoacetogenic bacteria and consumption producing hydrogen and methane bacterium, the hydrogen partial pressure making system remain lower, is conducive to methanogenic carrying out;
Finally, the mixture of reacted mud and Zero-valent Iron filler is delivered to follow-up anaerobic digestion device by the dumping device of reactor bottom.
This apparatus structure is simple, operation, easy to maintenance, by setting up this Zero-valent Iron strenuous primary treatment device link, effectively can promote the minimizing of mud, improve anaerobic digestion efficiency and the methane production of follow-up mud, reduce the processing cost of mud, methane belongs to clean energy simultaneously, can produce economic worth energy-conserving and environment-protective again.
Above-describedly be only the preferred embodiments of the present invention; be understood that; the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; the protection domain be not intended to limit the present invention; all any amendments, equivalent replacement etc. made within thought of the present invention and principle, all should be included within protection scope of the present invention.
Claims (3)
1. a Zero-valent Iron reinforcement sludge anaerobism pre-reaction device, comprising: sludge delivery pump, it is characterized in that, also comprise: Zero-valent Iron filler storage bin, tube-type spiral conveyer and feeding machine, Zero-valent Iron strengthening pre-reactor and agitator;
Described sludge delivery pump, Zero-valent Iron filler storage bin, tube-type spiral conveyer, feeding machine and Zero-valent Iron strengthening pre-reactor is closed system, adopts each other and is tightly connected;
Described tube-type spiral conveyer and feeding machine use carbon steel manufacture, include tubulose cell body, flange, screw-blade, bearing and gear motor;
Tube-type spiral conveyer is connected with the top of strengthening pre-reactor bottom Zero-valent Iron filler storage bin with Zero-valent Iron by flange respectively with feeding machine, composition closed system;
Described Zero-valent Iron strengthening pre-reactor entirety is cylindrical, and top is furnished with agitator, and reactor bottom is provided with dumping device.
2. a kind of Zero-valent Iron reinforcement sludge anaerobism pre-reaction device according to claim 1, is characterized in that, safety valve is equipped with at described Zero-valent Iron strengthening pre-reactor top.
3. a sludge pre-treatment method:
First, the mud in reception tank pumps in Zero-valent Iron strengthening pre-reactor by sludge pump, and conveying adopts semi continuous mode, and within every 4 hours, in pre-reactor, carry quantitative mud, the solid content of supplied materials mud controls between 5%-15%;
Secondly, Zero-valent Iron filler is quantitatively added to Zero-valent Iron strengthening pre-reactor by tube-type spiral conveyer and feeding machine bottom Zero-valent Iron filler storage bin, to the charging of Zero-valent Iron strengthening pre-reactor once, the dosing ratio of Zero-valent Iron filler and mud controls between 2%-5% every 4h;
Again, mud and Zero-valent Iron filler carry out mechanical stirring by the agitator at pre-reactor top, make Zero-valent Iron filler fully contact mixing with mud, and in pre-reactor, the mixing of mud and Zero-valent Iron filler and reaction times control at 3h;
Finally, the mixture of reacted mud and Zero-valent Iron filler is delivered to follow-up anaerobic digestion device by the dumping device of reactor bottom.
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Cited By (4)
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| CN105800897A (en) * | 2016-05-11 | 2016-07-27 | 合肥工业大学 | Method for intensifying rapid solid anaerobic digestion of residual sludge and straw by using zero-valent iron |
| CN113695356A (en) * | 2021-08-26 | 2021-11-26 | 同济大学 | Reactor for reinforcing anaerobic digestion capability of organic solid waste by using biological filler |
| US11479488B2 (en) * | 2020-08-06 | 2022-10-25 | Tongji University | Nano iron biological coupling device for organic wastewater and its process |
| CN115745159A (en) * | 2022-10-31 | 2023-03-07 | 江苏南大华兴环保科技股份公司 | Zero-valent iron synergistic steady flow type anaerobic reaction system applied to industrial sewage treatment |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105800897A (en) * | 2016-05-11 | 2016-07-27 | 合肥工业大学 | Method for intensifying rapid solid anaerobic digestion of residual sludge and straw by using zero-valent iron |
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| US11479488B2 (en) * | 2020-08-06 | 2022-10-25 | Tongji University | Nano iron biological coupling device for organic wastewater and its process |
| CN113695356A (en) * | 2021-08-26 | 2021-11-26 | 同济大学 | Reactor for reinforcing anaerobic digestion capability of organic solid waste by using biological filler |
| CN115745159A (en) * | 2022-10-31 | 2023-03-07 | 江苏南大华兴环保科技股份公司 | Zero-valent iron synergistic steady flow type anaerobic reaction system applied to industrial sewage treatment |
| CN115745159B (en) * | 2022-10-31 | 2023-11-28 | 江苏南大华兴环保科技股份公司 | Zero-valent iron cooperative steady-flow anaerobic reaction system applied to industrial sewage treatment |
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Effective date of registration: 20190510 Address after: 226110 Room 308, 42 Guangzhou Road, Nantong Development Zone, Jiangsu. Patentee after: Jiangsu Chi Tatsu Environmental Technology Co. Ltd. Address before: 100000 Building 401-A060, No. 1 Hospital, Shangdi East Road, Haidian District, Beijing Patentee before: RUIBO ENVIRONMENTAL PROTECTION TECHNOLOGY (BEIJING) CO., LTD. |