CN101413014A - Method and apparatuses for pretreating sewage plant excess sludge by microwave method and producing hydrogen by fermentation - Google Patents
Method and apparatuses for pretreating sewage plant excess sludge by microwave method and producing hydrogen by fermentation Download PDFInfo
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- CN101413014A CN101413014A CNA2007100359368A CN200710035936A CN101413014A CN 101413014 A CN101413014 A CN 101413014A CN A2007100359368 A CNA2007100359368 A CN A2007100359368A CN 200710035936 A CN200710035936 A CN 200710035936A CN 101413014 A CN101413014 A CN 101413014A
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Abstract
The invention discloses a method and a device for pretreating excess sludge of a sewage plant by a microwave method for fermentation to produce hydrogen. The method comprises the following steps: microwave is utilized to pretreat the excess sludge of the sewage plant for 2 to 20 minutes, then the sludge pretreated by the microwave is placed into a sealed fermentation hydrogen production reactor, hydrogen production seed sludge which accounts for 5 to 15 percent of the volume of the excess sludge is grafted, the temperature is controlled to between 25 and 45 DEG C for fermentation hydrogen production, and hydrogen is produced after 8 to 15 hours. The device comprises a microwave generator, the fermentation hydrogen production reactor and a hydrogen collection device, wherein the top of the fermentation hydrogen production reactor is provided with a hydrogen outlet, while the bottom is provided with a sludge inlet and a sludge discharge outlet; the microwave generator is connected with the sludge inlet of the fermentation hydrogen production reactor; the hydrogen collection device is connected with the hydrogen outlet of the fermentation hydrogen production reactor; and the fermentation hydrogen production reactor is provided with a stirrer and a heater. The method has the advantages that the method has large hydrogen yield and short delay time, can improve the biological redegradation capability of the sludge, can release heavy metals in the sludge, reduce the pollution of landfill treatment to soil, and has simple equipment, low cost and less energy consumption.
Description
Technical field
The invention belongs to a kind of method of utilizing the sewage plant excess sludge fermentation and hydrogen production, particularly a kind of by microwave irradiation pre-treatment mud, add the method for producing hydrogen kind mud ferment for hydrogen production, belong in the environment protection solid waste and utilize again and the clean energy production field.The present invention also comprises the device of realizing aforesaid method.
Background technology
Since coal, a large amount of uses of Nonrenewable resources such as oil, the human exhaustion that not only is faced with resource, but also can pollute environment, produce Greenhouse effect.In future, fossil oil must will be replaced by pollution-free fuel.Hydrogen is a kind of clean energy, only produces water during its burning, rather than greenhouse gases.And the heat that produces during combustion of hydrogen is 142.35KJ/g, is 2.75 times of hydrocarbon polymer.Therefore, hydrogen is the eco-friendly power source of a kind of high energy, cleaning.The generation of hydrogen can be passed through two kinds of approach: physico-chemical process and biological method.Physico-chemical process comprises and utilizes brine electrolysis to produce hydrogen that this is a kind of method that wastes energy very much, has promptly consumed electric energy, has consumed water again; The water-gas method has consumed the energy and water equally.And biological method is to utilize product hydrogen microorganism to come degradation of organic substances matter to produce hydrogen, and therefore, biological method is that the energy has been saved in environmental protection again.
Along with the Chinese Urbanization's process, increasing sewage work has come into operation or has built, and the mud that Sewage Plant produced simultaneously will bring very serious environmental problem, and processing costs also will significantly increase.Calendar year 2001, processed at the waste water that China is nearly 42.2 hundred million tons, produced about 55～1,060,000 tons of dewatered sludges.These mud at first will adopt the method for landfill to handle through dehydration then.Whole process expense is big, and landfill will account for tract, and toxic substances such as the heavy metal in the mud all will produce pollution to underground water and soil earth environment.
How to turn waste into wealth and more and more be subject to people's attention.Having a large amount of microbies in the sewage plant excess sludge, can discharge abundant carbohydrate and protein after the microbe cell wall rupture, is that a kind of ideal produces the hydrogen raw material.Utilize mud to produce hydrogen, rationally utilized waste, reduce surplus sludge volume, produce clean energy simultaneously.Therefore, it is fine to use the development prospect of this technology.
Existing mud produces the hydrogen technology to be had: the patent No. be ZL200310116142.6 patent disclosure " a kind of method and apparatus that utilizes the hydrogen manufacturing of sewage plant excess sludge anaerobically fermenting ", it is to use alkali pre-treatment mud to produce hydrogen, pH is transferred to 12～13, and suppresses methanobacteria.But the strong basicity environment is very unfavorable to the subsequent biological treatment of mud, and the landfill of excess sludge is bigger to the damage ratio primary sludge of soil, and exogenously added alkali, increases the production run cost.Application number is that 200510066428.7 patent application discloses a kind of " with the thermal treatment-fermentation and hydrogen production method of sewage treatment plant residual mud hydrogen manufacturing ", and its uses thermal treatment mud to produce hydrogen, and 121 ℃, 1.5 standard atmospheric pressures of pressure were handled 0.5 hour.This method time of lag long (fermenting to producing hydrogen during this period of time from beginning), hydrogen purity is low, and power consumption is big, the manufacturing of equipment is required high, increases production cost.
Summary of the invention
Technical problem to be solved by this invention is the defective that overcomes above-mentioned prior art, provide a kind of hydrogen output big, time of lag is short, can kill the pathogenic bacterium in the mud, and the biology of raising mud is degradation capability again, and can discharge heavy metal in the mud, reduce the pollution of landfill disposal, and equipment is simple, low cost of manufacture to soil, power consumption is little, the method and the device thereof of the microwave method pretreating sewage plant excess sludge fermentation and hydrogen production that consumes energy few.
For solving the problems of the technologies described above, the present invention adopts following technical proposals.
The method of microwave method pretreating sewage plant excess sludge fermentation and hydrogen production of the present invention is characterized in that it is to utilize Microwave Pretreatment sewage plant excess sludge 2～20min, to discharge the nutritive substance in the mud; The mud of getting then after the Microwave Pretreatment is put in the ferment for hydrogen production reactor of sealing, and hydrogen kind mud is produced in inoculation, and the kind mud volume of adding is 5～15% of an excess sludge volume, sealing; 25 ℃～45 ℃ of control leavening temperatures carry out fermentation and hydrogen production, produce hydrogen after 8～15 hours.
Described microwave generator power is 400～1000W.
The preparation of described product hydrogen kind mud is to get anaerobic grain sludge, 80～100 ℃ of heating in water bath 1.5～4 hours.
After described product hydrogen finished, most of mud was discharged, and stays part mud as kind of a mud.
After hydrogen kind mud is produced in inoculation, can be in the ferment for hydrogen production reactor nitrogen blowing 1-15min.
The present invention realizes the device of aforesaid method, it is a kind of anaerobically fermenting hydrogen making reaction device, this reaction unit comprises microwave generator, ferment for hydrogen production reactor and hydrogen collection device, the top of ferment for hydrogen production reactor is provided with hydrogen outlet, the bottom is provided with mud inlet and mud discharging mouth, described microwave generator joins by the mud inlet of pipeline and ferment for hydrogen production reactor, the hydrogen collection device joins by the hydrogen outlet of pipeline and ferment for hydrogen production reactor, and described ferment for hydrogen production reactor is equiped with agitator and well heater.
Described well heater comprises heating tube, temperature-sensing probe and temperature control box, and heating tube and temperature-sensing probe all stretch in the ferment for hydrogen production reactor, and links to each other with temperature control box.
Compared with prior art, beneficial effect of the present invention is:
1, the present invention utilizes Microwave Pretreatment mud and inoculation to produce hydrogen kind mud fermentation and hydrogen production, and the generation of hydrogen is big, and the time of lag of producing hydrogen is short.
2, hydrogen kind mud is produced in inoculation, has increased the content and the hydrogen purity of hydrogen in the biogas, increases hydrogen output.The generation of no methane gas.
3, the present invention does not add any chemical substance, only utilizes mud to produce hydrogen, saves cost, reduces the harm to environment.
4, adopt mud after the microwave treatment, the huge sum of money that can discharge in the mud belongs to aqueous phase, and can kill the pathogenic bacterium in the mud, reduces the mud landfill disposal to the pollution of soil and groundwater environment and to the mankind's potential hazard.
5, easy handling of the present invention and control, equipment is simple, low cost of manufacture, power consumption is little, invests for a short time, and power consumption is few.
6, microwave method for preprocessing can improve organic release in the mud, more can improve the biodegradability of mud after the fermentation, and the biology of raising mud is degradation capability again, improves the dewatering of mud.After producing the hydrogen end, the mud of discharge more can be used for other anaerobism or aerobic treatment, further utilizes the residual organic substances in the mud, makes mud decrement.
7, the present invention can utilize various types of sewage plant excess sludges, can realize the utilization once more of excess sludge and the generation of clean energy, greatly reduces the processing costs of sewage plant excess sludge, economizes on resources, and turns waste into wealth.
The present invention has the practicality that hydrogen is produced in industry, is a kind of biological hydrogen production method that is applicable to various sewage plant excess sludges.
Description of drawings
Fig. 1 is the structural representation of apparatus of the present invention.
Each label is represented among the figure:
1, primary sludge import 2, microwave generator
3, mud inlet 4, mud discharging mouth
5, fermentor tank 6, agitator
7, hydrogen collection device 8, temperature control box
9, heating tube 10, temperature-sensing probe
11, hydrogen outlet 12, pump
Embodiment
The device of microwave method pretreating sewage plant excess sludge fermentation and hydrogen production of the present invention, it is a kind of anaerobically fermenting hydrogen making reaction device, this reaction unit comprises microwave generator 2, ferment for hydrogen production reactor 5 and hydrogen collection device 7, this ferment for hydrogen production reactor 5 is a closed reactor, the top of ferment for hydrogen production reactor 5 is provided with hydrogen outlet 11, the bottom is provided with mud inlet 3 and mud discharging mouth 4, microwave generator 2 joins by the mud inlet 3 of pipeline and ferment for hydrogen production reactor 5, one mud transferpump 12, with the sealing microwave generator 2 between link to each other with pipeline, this transferpump 12 pumps into mud in the microwave generator 2 by primary sludge import 1; After microwave generator 2 is finished the pre-treatment of mud, another transferpump 12 is delivered to the mud inlet 3 of pretreated mud by ferment for hydrogen production reactor 5 in the ferment for hydrogen production reactor 5, hydrogen collection device 7 joins by the hydrogen outlet 11 of pipeline and ferment for hydrogen production reactor 5, to collect the hydrogen of hydrogen manufacturing fermentor tank 5 outputs.Ferment for hydrogen production reactor 5 is equiped with agitator 6 and well heater.This well heater is made up of heating tube 9, temperature-sensing probe 10 and temperature control box 8, heating tube 9 and temperature-sensing probe 10 all stretch in the ferment for hydrogen production reactor 5, and link to each other with temperature control box 8, the temperature that well heater can heat and control ferment for hydrogen production reactor 5 reaches predetermined temperature value.This device produces hydrogen reactor for intermittent type.After producing the hydrogen end, most of mud is discharged by mud discharging mouth 4, can stay part mud as kind of a mud, removes the trouble of preparation kind of mud once more from.
The present invention can utilize various types of sewage plant excess sludges, can realize the utilization once more of excess sludge and the generation of clean energy, increases the dehydrating effect of mud simultaneously, reduces sludge quantity, and the biology of raising mud is degradation capability again.Reduce of the pollution of mud landfill disposal, greatly reduce the processing costs of sewage plant excess sludge, economize on resources, turn waste into wealth soil and groundwater environment.Present device is simple, and is easy and simple to handle, is easy to control, invest for a short time, and power consumption less.Method of the present invention has the practicality that hydrogen is produced in industry, is a kind of biological hydrogen production method that is applicable to various sewage plant excess sludges.
Embodiment 1:
Get municipal wastewater treatment plant second pond mud 100ml, the concentration of mud is that MLSS (blended solid suspended solids) is 16.52g/L.Microwave Pretreatment 2min, microwave reactor uses power 560W.To discharge the organic nutrient substance in the mud, killed methanogen and pathogenic bacterium simultaneously, and can discharge the part heavy metal that adsorbs in the mud.After the pre-treatment, the nutrition in the mud is released, and wherein the primary sludge Protein content rises to 410.52mg/L from 25.40mg/L; The content of carbohydrate rises to 202.65mg/L from 18.72mg/L; SCOD (solvability COD) brings up to 2840mg/L by the 1520mg/L of primary sludge.
Then pretreated mud is put in the serum bottle, adds and produce hydrogen kind mud 5ml, 35 ℃ of controlled temperature, nitrogen blowing 5min to remove the airborne oxygen in excess sludge upper strata, keeps the anaerobic environment of fermentation and hydrogen production reactor, begins to produce hydrogen after 9 hours.Maximum product hydrogen rate is 11.44ml/gCOD.Wherein the content of hydrogen is more than 80%, and all the other are carbonic acid gas, does not have the generation of methane gas.In the fermenting process, the highest 1500.21mg/L that rises to of protein, the highest 1306.40mg/L that rises to of carbohydrate.Fermentation and hydrogen production still has a large amount of nutritive substances not to be utilized after finishing, and protein is 790.41mg/L; Carbohydrate is 415.66mg/L.Therefore, mud produces the hydrogen fermentation, further releasing organics, the bio-degradable of raising subsequent biological treatment.
Embodiment 2:
Get 1 liter of anaerobic grain sludge, 80 ℃ of heating in water bath 2 hours are as producing hydrogen kind mud.
With MLSS is 10 liters of the sewage plant excess sludges of 15.21g/L, is pumped in the microwave reactor 2 pre-treatment 10min, power 800W by primary sludge import 1 by transferpump 12.And then by pipeline pretreated mud is continuously pumped in the ferment for hydrogen production reactor 5 by mud inlet 3 by another transferpump 12, add 1 liter and produce hydrogen kind mud, by 35 ℃ of well heater controlled temperature, open agitator 6, product hydrogen kind mud and mud are mixed.Produce hydrogen behind the 12h, hydrogen is collected by hydrogen collection device 7 by hydrogen outlet 11.Average per 10 liters of mud can produce 1000～3000ml hydrogen, and maximum product hydrogen rate is 10.89ml/gCOD, and sludge retention time is 24h.The content of hydrogen is greater than 80% in the biogas that produces, the generation of no methane.The high-purity hydrogen that produces is collected in the gas collector 7, can take out use.
After producing the hydrogen end, most of mud is discharged by mud discharging mouth 4, can stay part mud as kind of a mud, and next fermentation and hydrogen production uses.
Claims (7)
1, a kind of method of microwave method pretreating sewage plant excess sludge fermentation and hydrogen production is characterized in that it is to utilize Microwave Pretreatment sewage plant excess sludge 2～20min, to discharge the nutritive substance in the mud; The mud of getting then after the Microwave Pretreatment is put in the ferment for hydrogen production reactor of sealing, and hydrogen kind mud is produced in inoculation, and the kind mud volume of adding is 5～15% of an excess sludge volume, sealing; 25 ℃～45 ℃ of control leavening temperatures carry out fermentation and hydrogen production, produce hydrogen after 8～15 hours.
2, the method for microwave method pretreating sewage plant excess sludge fermentation and hydrogen production according to claim 1 is characterized in that described microwave generator power is 400～1000W.
3, the method for microwave method pretreating sewage plant excess sludge fermentation and hydrogen production according to claim 1 and 2 is characterized in that the preparation of described product hydrogen kind mud is to get anaerobic grain sludge, 80～100 ℃ of heating in water bath 1.5～4 hours.
4, the method for microwave method pretreating sewage plant excess sludge fermentation and hydrogen production according to claim 1 and 2, it is characterized in that described product hydrogen finishes after, most of mud is discharged, and stays part mud as kind of a mud.
5, the method for microwave method pretreating sewage plant excess sludge fermentation and hydrogen production according to claim 1 and 2, it is characterized in that hydrogen kind mud is produced in inoculation after, nitrogen blowing 1-15min in the ferment for hydrogen production reactor.
6, a kind of device of realizing the described method of claim 1, it is characterized in that it is a kind of anaerobically fermenting hydrogen making reaction device, this reaction unit comprises microwave generator, ferment for hydrogen production reactor and hydrogen collection device, the top of ferment for hydrogen production reactor is provided with hydrogen outlet, the bottom is provided with mud inlet and mud discharging mouth, described microwave generator joins by the mud inlet of pipeline and ferment for hydrogen production reactor, the hydrogen collection device joins by the hydrogen outlet of pipeline and ferment for hydrogen production reactor, and described ferment for hydrogen production reactor is equiped with agitator and well heater.
7, device according to claim 6 is characterized in that described well heater comprises heating tube, temperature-sensing probe and temperature control box, and described heating tube and temperature-sensing probe all stretch in the ferment for hydrogen production reactor, and link to each other with temperature control box.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007100359368A CN101413014A (en) | 2007-10-19 | 2007-10-19 | Method and apparatuses for pretreating sewage plant excess sludge by microwave method and producing hydrogen by fermentation |
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| CNA2007100359368A CN101413014A (en) | 2007-10-19 | 2007-10-19 | Method and apparatuses for pretreating sewage plant excess sludge by microwave method and producing hydrogen by fermentation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102020404A (en) * | 2010-12-01 | 2011-04-20 | 同济大学 | Method for improving fermentation capability of slurry dry process |
| CN105755049A (en) * | 2015-12-11 | 2016-07-13 | 清华大学 | Method of preparing hydrogen by using xylose as substrate for fermentation |
| CN108624623A (en) * | 2018-06-13 | 2018-10-09 | 湖南大学 | A method of strengthening residual active sludge hydrogen production through anaerobic fermentation |
| CN109331756A (en) * | 2018-10-31 | 2019-02-15 | 江南大学 | A kind of pretreatment unit and technique of paper products filler |
| CN110699388A (en) * | 2019-11-18 | 2020-01-17 | 天津城建大学 | Method for producing 2, 3-butanediol by using carbohydrate waste |
-
2007
- 2007-10-19 CN CNA2007100359368A patent/CN101413014A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102020404A (en) * | 2010-12-01 | 2011-04-20 | 同济大学 | Method for improving fermentation capability of slurry dry process |
| CN105755049A (en) * | 2015-12-11 | 2016-07-13 | 清华大学 | Method of preparing hydrogen by using xylose as substrate for fermentation |
| CN105755049B (en) * | 2015-12-11 | 2020-04-07 | 清华大学 | Method for preparing hydrogen by fermenting with xylose as substrate |
| CN108624623A (en) * | 2018-06-13 | 2018-10-09 | 湖南大学 | A method of strengthening residual active sludge hydrogen production through anaerobic fermentation |
| CN109331756A (en) * | 2018-10-31 | 2019-02-15 | 江南大学 | A kind of pretreatment unit and technique of paper products filler |
| CN110699388A (en) * | 2019-11-18 | 2020-01-17 | 天津城建大学 | Method for producing 2, 3-butanediol by using carbohydrate waste |
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Open date: 20090422 |