CN102120114B - Method for pretreating ethanol fermentation liquor of food and kitchen waste by flocculation-filtration combined process - Google Patents
Method for pretreating ethanol fermentation liquor of food and kitchen waste by flocculation-filtration combined process Download PDFInfo
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- CN102120114B CN102120114B CN 201010562885 CN201010562885A CN102120114B CN 102120114 B CN102120114 B CN 102120114B CN 201010562885 CN201010562885 CN 201010562885 CN 201010562885 A CN201010562885 A CN 201010562885A CN 102120114 B CN102120114 B CN 102120114B
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Abstract
The invention belongs to the field of biological fermentation and relates to a method for treating ethanol fermentation liquor of food and kitchen waste, which comprises the following process steps: adding hydrochloric acid or sodium hydroxide into the fermentation liquid to regulate the pH value of the fermentation liquor to 2 to 10, and heating to 30 to 60 DEG C; adding 0.5 to 1.0 gram of flocculant per liter, uniformly stirring for 5 minutes at a constant rotation speed of 800r/min, standing and settling for 30 minutes; subjecting the flocculated fermentation liquor to solid-liquid separation to remove the flocculate from the fermentation liquor; transferring the separated liquid phase to a subsequent fiber ball-quartz sand composite filter column for filtration; and transferring the filtrate obtained after filtration into a pervaporation system for separating ethanol. The invention has the advantages that: the operation is simple; the cost is low; the treatment efficiency is high;the target product is hardly damaged; the method is an excellent method for treating the fermentation liquor of food and kitchen waste; and more space is provided for the further purification and utilization of the fermentation liquor.
Description
Technical field:
The invention belongs to the biofermentation field, relate to a kind of processing method of kitchen waste ethanol fermentation liquid.
Background technology:
In recent years, along with the development of economy, fossil energy day by day exhausted day by day is subject to people to the research of regenerative resource and payes attention to.Alcohol fuel is simple owing to its preparation technology, and can be used as the ethanol petrol use, has obtained the extensive concern of countries in the world.In recent years, people have carried out broad research to the technology of utilizing microbial fermentation to produce alcohol fuel.Chinese patent CN100478437C discloses a kind of way of producing fuel alcohol by kitchen garbage fermentation, take changing food waste with low cost as raw material, adds carbohydrase and saccharomycete and ferments, and makes the zymotic fluid that ethanol content is 5-11%.But when it extracts ethanol from zymotic fluid, use be traditional way of distillation, complicated operation and energy consumption are higher, if can seek the cheaper separation of ethanol technology of cost, will further reduce the operating cost of this technology.
Infiltration evaporation is as a kind of novel membrane separation technique, since the sixties in last century, owing to its low energy consumption intrinsic in separation process, not introducing the advantages such as the 3rd component, blowdown are few, obtained gradually people's recognition and acceptance.At present infiltration evaporation has been realized industrialization in high concentration ethanol/water dehydration field, in rare alcohol/water dealcoholysis field at present also in research and development, but realize efficient separation that the party makes progress to reduce the alcohol production cost, reduce energy consumption all significant.At present in the research that wide model has been arranged aspect membrane module, the membrane technology, its Patent CN1101249C has announced a kind of method of using separating aqueous solution of alcohol with polyvinylidene fluoride permeable vaporizing membrane, the ethanolic solution that the method can separating alcohol solution 0.1%-20%.CN1186450C has announced the method for a kind of biomass ferment and film infiltration Joint Production absolute ethyl alcohol, wherein fermentation clear liquid will be through the inorganic filter membrane of 0.1-1um, then enter the infiltration evaporation system, as seen zymotic fluid is carried out suitable pre-treatment helps its follow-up lock out operation.Publication number is the method that the patent of CN 101235389A discloses a kind of fermentation and infiltration evaporation Joint Production ethanol, the method realizes separating of solid content and clear liquid by the filter screen type separator is set in fermentation tank bottom, clear liquid carries out infiltration evaporation to be separated, and this measure can alleviate zymotic fluid to the pollution of follow-up infiltration evaporation by separating solid content.
Kitchen waste ethanol fermentation liquid complicated component, contain a large amount of oil contents and viscose glue shape suspended impurity, general processing method is difficult to remove fully, these impurity can stick to the surface of infiltrating and vaporizing membrane, cause the pollution of film, therefore, inquire into easy and simple to handle, successful, changing food waste fermentation liquor pretreatment method with low cost is very necessary.But still lack the research and development to technique at present.
Summary of the invention
In order to address the above problem, the purpose of this invention is to provide a kind of method by flocculation-filtration associating, in the situation that do not affect ethanol content in the zymotic fluid, remove oil content and suspended solid (SS) in the zymotic fluid, make zymotic fluid after the processing can be better carry out pretreated method by what infiltrating and vaporizing membrane carried out separation of ethanol to kitchen waste ethanol fermentation liquid.
Technical solution of the present invention is: the method for a kind of flocculation-filtration combined pretreatment kitchen waste ethanol fermentation liquid, the method comprises the steps:
Step 1: zymotic fluid is added hydrochloric acid or NaOH adjusting pH value to 2～10, be heated to 30～60 ℃;
Step 2: add flocculant, the rotating speed with 800r/min at the uniform velocity stirs 5min, standing sedimentation 30min afterwards; Wherein, the mass body volume concentrations of flocculant in zymotic fluid is 0.5g/L～1.0g/L;
Step 3: use decantation or plate compression method to carry out Separation of Solid and Liquid to the zymotic fluid after the flocculation and remove flco in the zymotic fluid;
Step 4: the liquid phase after separating enters long 20-30cm, and the fibrous nodules of diameter 3-5cm-quartz sand composite filter post filters;
Step 5: the filtrate after processing after filtration enters the infiltration evaporation system and carries out separation of ethanol.
Described zymotic fluid is the mixture that contains ethanol, oil content, residual sugar, protein and bacterial chip that kitchen waste ethanol fermentation obtains by the plate and frame filter press press filtration.
In the above-mentioned steps (1), with the pH value of hydrochloric acid or NaOH adjusting zymotic fluid.Add different flocculants, its suitable pH value scope is different.The optimum pH value scope of adding gelatin is 7～10, and the optimum pH value of tannic acid is 2～5.
The flocculant that joins in the above-mentioned steps (2) in the zymotic fluid is gelatin or tannic acid organic flocculant.From flocculating effect, add gelatin and the tannic acid of equivalent, the former flocculating effect obviously is better than the latter.By adding flocculant, can sedimentation remove the most of starch in the zymotic fluid, the suspended impurities such as bacterial chip, protein, pigment not have to affect on the ethanol content in the liquid phase substantially.
In the above-mentioned steps (5), by membrane separation concentration ethanol, its membrane separation process is pervaporation method through the zymotic fluid of flocculation-filter combined pretreatment.
The present invention is simple to operate, with low cost, and on not obviously impact of the ethanol content in the zymotic fluid, zymotic fluid after treatment can satisfy the water inlet requirement of infiltration evaporation process, for this emerging membrane separation technique with low cost of infiltration evaporation provides larger possibility in the commercial Application aspect the kitchen waste ethanol fermentation.
The specific embodiment
Embodiment 1
Changing food waste is carried out preliminary sorting, remove the foreign material that are difficult for fermentation, be filtered dry, solid matter is pulverized; Add the water of 1 times of solid matter quality, mix, obtain the rubbish slurry; Add Angel solid dry ferment in the rubbish slurry, addition is every 100g rubbish slurry 0.1g, adds simultaneously the carbohydrase of 5kU according to every 100g rubbish slurry; Postvaccinal rubbish is starched the anaerobic condition bottom fermentation 48h at 35 ℃; Rubbish after fermentation slurry is carried out Separation of Solid and Liquid by modes such as press filtrations, and gained liquid is the changing food waste zymotic fluid.
Get changing food waste zymotic fluid 50ml, regulating the pH value is 10, be heated to 30 ℃, press table 1 and add gelatin, obvious flocculate appears about the rotating speed even stirring 5min of constant speed with 800r/min, standing sedimentation 30min, and inclining supernatant, be delivered in fibrous nodules-quartz sand composite filter post with peristaltic pump and filter, each phase process effect is as shown in table 1:
Table 1 gelatin different amounts Contrast on effect
* 1 clearance=[this content of material before (Combined Treatment before this content of material-Combined Treatment after this content of material)/Combined Treatment] * 100%
* 2 ethanol loss lates=[concentration of alcohol before (Combined Treatment before concentration of alcohol-Combined Treatment after concentration of alcohol)/Combined Treatment] * 100%
Embodiment 2
Make the changing food waste zymotic fluid by embodiment 1 described method, get changing food waste zymotic fluid 50ml, regulating the pH value is 2, be heated to 40 ℃, press table 2 and add tannic acid, obvious flocculate to occur about the even 5min of stirring of the rotating speed of 800r/min, standing sedimentation 30min, inclining supernatant, is delivered in fibrous nodules-quartz sand composite filter post with peristaltic pump and filters, and each phase process effect is as shown in table 2:
Table 2 tannic acid different amounts Contrast on effect
* 1 clearance=[this content of material before (Combined Treatment before this content of material-Combined Treatment after this content of material)/Combined Treatment] * 100%
* 2 ethanol loss lates=[concentration of alcohol before (Combined Treatment before concentration of alcohol-Combined Treatment after concentration of alcohol)/Combined Treatment] * 100%
Embodiment 3
Make the changing food waste zymotic fluid by embodiment 1 described method, get changing food waste zymotic fluid 50ml, regulating the pH value is 8, be heated to 50 ℃, press table 2 and add gelatin, obvious flocculate to occur about the even 5min of stirring of the rotating speed of 800r/min, standing sedimentation 30min, inclining supernatant, is delivered in fibrous nodules-quartz sand composite filter post with peristaltic pump and filters, and each phase process effect is as shown in table 2:
Table 3 tannic acid different amounts Contrast on effect
* 1 clearance=[this content of material before (Combined Treatment before this content of material-Combined Treatment after this content of material)/Combined Treatment] * 100%
* 2 ethanol loss lates=[concentration of alcohol before (Combined Treatment before concentration of alcohol-Combined Treatment after concentration of alcohol)/Combined Treatment] * 100%
Claims (2)
1. the method for flocculation-filtration combined pretreatment kitchen waste ethanol fermentation liquid is characterized in that comprising the steps:
Step 1: zymotic fluid is added hydrochloric acid or NaOH adjusting pH value to 2～10, be heated to 30～60 ℃;
Step 2: after adding flocculant tannic acid or gelatin, at the uniform velocity stir 5min, standing sedimentation 30min with the rotating speed of 800r/min; Wherein, the mass body volume concentrations of flocculant in zymotic fluid is 0.5g/L～1.0g/L;
Step 3: use decantation or plate compression method to carry out Separation of Solid and Liquid to the zymotic fluid after the flocculation and remove flco in the zymotic fluid;
Step 4: the liquid phase after separating enters long 20～30cm, diameter 3～5cm's, upper strata filling fiber ball, lower floor's filling quartz sand, filling length accounts for respectively in 1/2 the two-layer compound filter post of filter column length and filters;
Step 5: the filtrate after will processing after filtration enters the infiltration evaporation system and carries out separation of ethanol.
2. the method for flocculation according to claim 1-filtration combined pretreatment kitchen waste ethanol fermentation liquid is characterized in that described zymotic fluid is the mixture that contains ethanol, oil content, residual sugar, protein and bacterial chip that kitchen waste ethanol fermentation obtains by the plate and frame filter press press filtration.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1948498A (en) * | 2006-10-24 | 2007-04-18 | 北京科技大学 | Method of producing fuel alcohol by kitchen garbage fermentation |
| CN101186400A (en) * | 2007-12-18 | 2008-05-28 | 黄大军 | Harmless treatment method for discarded slurry |
| CN101235389A (en) * | 2008-03-04 | 2008-08-06 | 南京工业大学 | Fermentation and infiltration vaporization coupling technique for producing ethanol |
| CN101823953A (en) * | 2010-03-31 | 2010-09-08 | 北京科技大学 | Method for separating lactic acid from fermentation liquor by flocculation and carrying out flocculate comprehensive utilization |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0760299A (en) * | 1993-08-24 | 1995-03-07 | Kyodo Kumiai Inbaiomento | Method for pressure-dehydrating fermentable organic liquid with high efficiency |
| JPH07308656A (en) * | 1994-05-20 | 1995-11-28 | Toyo Dynam Kk | Apparatus for treating organic waste |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1948498A (en) * | 2006-10-24 | 2007-04-18 | 北京科技大学 | Method of producing fuel alcohol by kitchen garbage fermentation |
| CN101186400A (en) * | 2007-12-18 | 2008-05-28 | 黄大军 | Harmless treatment method for discarded slurry |
| CN101235389A (en) * | 2008-03-04 | 2008-08-06 | 南京工业大学 | Fermentation and infiltration vaporization coupling technique for producing ethanol |
| CN101823953A (en) * | 2010-03-31 | 2010-09-08 | 北京科技大学 | Method for separating lactic acid from fermentation liquor by flocculation and carrying out flocculate comprehensive utilization |
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Inventor after: Gao Ming Inventor after: Wang Qunhui Inventor after: Zhang Wenyu Inventor after: Ma Hongzhi Inventor after: Wang Lijuan Inventor after: Zhao Fangni Inventor before: Wang Qunhui Inventor before: Zhang Wenyu Inventor before: Ma Hongzhi Inventor before: Wang Lijuan Inventor before: Gao Ming Inventor before: Zhao Fangni |
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Effective date of registration: 20210706 Address after: 015000 No.2 farm breeding Park, xishanzui farm, Wulashan Town, wulateqian banner, Bayannaoer City, Inner Mongolia Autonomous Region Patentee after: Inner Mongolia Xinwang bio fertilizer technology Co.,Ltd. Address before: 100083 No. 30, Haidian District, Beijing, Xueyuan Road Patentee before: University OF SCIENCE AND TECHNOLOGY BEIJING |
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