CN100593975C - Method for recovering solid residue from waste liquor of alcohol prepared by fermenting cassava - Google Patents
Method for recovering solid residue from waste liquor of alcohol prepared by fermenting cassava Download PDFInfo
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- CN100593975C CN100593975C CN200710304356A CN200710304356A CN100593975C CN 100593975 C CN100593975 C CN 100593975C CN 200710304356 A CN200710304356 A CN 200710304356A CN 200710304356 A CN200710304356 A CN 200710304356A CN 100593975 C CN100593975 C CN 100593975C
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12F—RECOVERY OF BY-PRODUCTS OF FERMENTED SOLUTIONS; DENATURED ALCOHOL; PREPARATION THEREOF
- C12F3/00—Recovery of by-products
- C12F3/10—Recovery of by-products from distillery slops
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/32—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters
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- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Water Supply & Treatment (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Mechanical Engineering (AREA)
- Biochemistry (AREA)
- Genetics & Genomics (AREA)
- Wood Science & Technology (AREA)
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- General Health & Medical Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Health & Medical Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a method for recycling solid residue from the waste fluid generated in the process for preparing ethanol by fermenting cassava. The method includes that: the water in the wastefluid is removed to obtain a filter cake which is then dried to acquire the solid residue, wherein, the water content of the filter cake is less than 60 percent by weight based on the total weight ofthe filter cake. The method provided by the invention not only can greatly lower the energy consumption for recycling the solid residue, but also can remarkably reduce the impurity content and the CODvalue of the water removed by compression, thus reducing the abrasion to equipment caused by impurities, lowering the maintenance cost as well as the environmental pressure.
Description
Technical field
The invention relates to a kind of method that from the waste liquid of preparation of ethanol by fermentation of cassava, reclaims solid residue
Background technology
Cassava is one of the world three big tuber crops, is the preferred raw materials of producing bio-ethanol.By 2005, China's cassava cultivated area reached 6,570,000 mu, existing tapioca in the whole nation and more than 200 families of alcohol processing factory, year 500000 tons of starch of production, 250,000 tons of cassava ethanol.Because the waste liquid of preparation of ethanol by fermentation of cassava contains the organic matter of high concentration, the waste liquid of present most ethanol factory discharging is through effectively handling directly outwards discharging, the water environment in local and downstream caused have a strong impact on.
At present, the processing method of the waste liquid of preparation of ethanol by fermentation of cassava has: 1, burning method, be about to burn after waste liquid concentrates, and the shortcoming of this method causes secondary pollution easily after burning; 2, use the waste liquid ferment preparation of sludge gas, the shortcoming of this method is big and control technology requirement height for investment.
Therefore, the common at present method that adopts the solid residue in the waste liquid that reclaims preparation of ethanol by fermentation of cassava to dispose waste liquid as feed, this method comprise anhydrates the waste liquid filtration, obtains filter cake; Afterwards filter cake is dried.This method is a kind of small investment, the processing method of operation and the waste liquid of environment amenable preparation of ethanol by fermentation of cassava easily, but, adopt the energy consumption of this method bigger, and this method is filtered the more serious wear to press apparatus of impurity in the water of removing, increased maintenance cost, and chemical oxygen demand value (COD value) is higher in the water of removing, and environmental pressure is very big.
Summary of the invention
The objective of the invention is to have the big shortcoming of energy consumption, provide a kind of energy consumption the little method that from the waste liquid of preparation of ethanol by fermentation of cassava, reclaims solid residue in order to overcome the existing method that from the waste liquid of preparation of ethanol by fermentation of cassava, reclaims solid residue.
The present inventor has carried out careful research to the existing method that reclaims solid residue from the waste liquid of preparation of ethanol by fermentation of cassava, find in the existing method, the water content of the filter cake that obtains after waste liquid dewaters is usually up to more than the 75 weight %, and existing method also can't further reduce the water content of filter cake; Thereby make energy consumption required in the follow-up drying course higher.
The invention provides a kind of method that reclaims solid residue from the waste liquid of preparation of ethanol by fermentation of cassava, this method comprises the water of removing in the waste liquid, obtains filter cake; Afterwards filter cake being dried, obtain solid residue, wherein, is benchmark with the gross weight of filter cake, and the water content of filter cake is less than 60 weight %.
Among the present invention, by in the water content that has significantly reduced the filter cake that obtains, thereby reduced energy consumption required in the follow-up drying course significantly.For example, the water content of the filter cake A1-A3 that embodiment of the invention 1-3 obtains is respectively 60 weight %, 50 weight % and 55 weight %, the water content of the reference filter cake CA1 that Comparative Examples 1 obtains is then up to 78 weight %, explanation reduces the water content that the waste liquid of preparation of ethanol by fermentation of cassava filtered and squeezed the filter cake that obtains significantly by method provided by the invention, and embodiment 1-3 compares with Comparative Examples 1, the energy consumption of baking needed significantly reduces, and illustrates by method provided by the invention significantly to reduce the required energy consumption of recovery solid residue.
The specific embodiment
The invention provides a kind of method that reclaims solid residue from the waste liquid of preparation of ethanol by fermentation of cassava, this method comprises the water of removing in the waste liquid, obtains filter cake; Afterwards filter cake being dried, obtain solid residue, wherein, is benchmark with the gross weight of filter cake, and the water content of filter cake is less than 60 weight %.
According to the present invention, described water content can obtain by variety of way less than the filter cake of 60 weight %, for example can obtain by described waste liquid filtered and squeeze.
The present inventor has carried out careful research to the existing method that reclaims solid residue from the waste liquid of preparation of ethanol by fermentation of cassava, find to use usually in the prior art common filter press that the waste liquid of preparation of ethanol by fermentation of cassava is filtered, waste liquid enters between the common filter plate of filter press when filtering, solid particle is trapped in the space between the filter plate by the filter medium of filter plate, liquid then passes through filter medium, discharge outside the filter press by portalling, continuity along with filter process, the thickness of filter cake increases gradually, the resistance of dehydration increases exponentially thereupon, thereby cause the rapid decline for the treatment of capacity, and because the restriction of the character of common filter plate own, filter pressure can't further improve (generally below 1MPa), thereby can't further reduce the water content that obtains filter cake.
According to the present invention, can use various device that described waste liquid is filtered and squeezes, under the preferable case, can use diaphragm filter press to realize, diaphragm filter press promptly has the filtering function identical with the common diaphragm filter press, have again filter cake is squeezed and function that it is dewatered once more, in diaphragm filter press, common filter plate and membrane filter plate are spaced, the middle central layer of described membrane filter plate and both sides barrier film compress and form two Sealed sandwiches, the filtering function of described membrane filter plate is identical with common filter plate, but has increased pressing function, promptly, after filtering end, extrusion medium is injected into the sealant from middle central layer hand-hole, because the elastic reaction of barrier film can carry out the blow-up squeezing to the filter cake after filtering, and filter cake is dewatered once more.
The quantity of common filter plate and membrane filter plate can be adjusted according to the concentration of waste liquid in the described diaphragm filter press, under the preferable case, the quantity of common filter plate is 50-60, and described common filter plate can be commercially available, for example the chamber filter plate of Jingjin Filter Press Group Co.,Ltd's production; The quantity of membrane filter plate is 50-60, and described membrane filter plate can be commercially available, for example 1250 type membrane filter plates of Jingjin Filter Press Group Co.,Ltd's production; Common filter plate is spaced with membrane filter plate and the ratio of the quantity of common filter plate and the quantity of membrane filter plate is 1: 1; The diaphragm filter press that meets above-mentioned requirements can be commercially available, for example, and the X that Jingjin Filter Press Group Co.,Ltd produces
M AZG600/1500 * 2000U
B KThe diaphragm filter press of model.
The inventor finds, uses diaphragm filter press not only can reduce the water content of squeezing the filter cake that obtains significantly, can also significantly reduce the content that squeezes impurity in the water of removing, and has reduced the wearing and tearing of impurity to equipment, has reduced maintenance cost; And the COD value is also lower in the water of removing, and has alleviated environmental pressure.
Among the present invention, the waste liquid of described preparation of ethanol by fermentation of cassava is meant by cassava and ferments when preparing ethanol, distills out after the ethanol that obtains residual solidliquid mixture.
Among the present invention, the condition of described filtration has no particular limits, and under the preferable case, the condition of described filtration comprises that the pressure of filtration is 0.4-1MPa, and filter time is 2-8 hour; More preferably, the condition of described filtration comprises that the pressure of filtration is 0.5-0.8MPa, and filtration time is 4-6 hour.
According to the present invention, the condition of described squeezing has no particular limits, and under the preferable case, the condition of described squeezing comprises that the pressure of squeezing is 10-25MPa, and the time of squeezing is 0.2-2 hour; More preferably, the condition of described squeezing comprises that the pressure of squeezing is 15-20MPa, and the time of squeezing is 0.5-1 hour.
Among the present invention, described squeeze pressure can realize that described extrusion medium can be diaphragm filter press various extrusion medium commonly used by charge into extrusion medium in diaphragm filter press, and for example, described extrusion medium can be compressed air and/or water.
According to the present invention, the equipment of described oven dry can be the drying plant of various routines, for example, the WJI-900B boiling drier and the combined dryer of XLS-100 type flash dryer of the HZG series dryer of the long-range company in Shenyang production and the production of Beijing benefit civilian worker trade Co., Ltd.Among the present invention, the condition of described oven dry is conventionally known to one of skill in the art, and for example, the condition of described oven dry comprises that bake out temperature is 100-200 ℃, and drying time is 0.2-2 hour; More preferably, bake out temperature is 120-150 ℃, and drying time is 0.5-1 hour.
To do further specific descriptions to the present invention by specific embodiment below.
Embodiment 1
With water content is that the waste liquid (1 ton) of the preparation of ethanol by fermentation of cassava of 95 weight % joins diaphragm filter press (Jingjin Filter Press Group Co.,Ltd, X
M AZG600/1500 * 2000U
B K) in filter, the quantity of common filter plate in the described diaphragm filter press (Jingjin Filter Press Group Co.,Ltd, chamber filter plate) is 50, membrane filter plate (Jingjin Filter Press Group Co.,Ltd, 1250 types) quantity is 50, and common filter plate and membrane filter plate are spaced; The condition of described filtration comprises that the pressure of filtration is 0.8MPa, and filter time is 2 hours, obtains filter cake; Charge into the extrusion medium air afterwards in membrane filter plate, the filter cake after filtering is squeezed, the pressure of described squeezing is 10MPa, and the time of squeezing is 2 hours, the filter cake A1 that obtains.
(result is as shown in table 1 for Shanghai Precision Scientific Apparatus Co., Ltd, the SH-10A) water content of detection filter cake A1 by moisture determination instrument.
The filter cake A1 that obtains is put into (Zhengzhou Wangu Machinery Co., Ltd. in the air-flow tumble-type dryers, JB/T10279-2001) dry, the temperature of oven dry is 120 ℃, the time of oven dry is 1.5 hours, obtain solid residue D1, (water content of solid residue D1 and the energy consumption of oven dry are as shown in table 1 for Shanghai Precision Scientific Apparatus Co., Ltd, the SH-10A) water content of detection solid residue D1 by moisture determination instrument.
Described energy consumption is meant to dry removes 1 kilogram the coal that water consumed, and unit is a kg/kg.
Comparative Examples 1
Filter according to the waste liquid of the method identical preparation of ethanol by fermentation of cassava with embodiment 1, different is with membrane filter plate (Jingjin Filter Press Group Co.,Ltd, 1250 types) replace with common filter plate (Jingjin Filter Press Group Co.,Ltd, chamber filter plate), the condition of described filtration comprises that the pressure of filtration is 0.8MPa, filter time is 2 hours, obtains reference filter cake CA1.
(result is as shown in table 1 for Shanghai Precision Scientific Apparatus Co., Ltd, the SH-10A) water content of detection reference filter cake CA1 by moisture determination instrument.
The reference filter cake CA1 that obtains is put into (Zhengzhou Wangu Machinery Co., Ltd. in the air-flow tumble-type dryers, JB/T10279-2001) dry, the temperature of oven dry is 120 ℃, the time of oven dry is 1.5 hours, obtain solid residue CD1, (water content of reference solid residue CD1 and the energy consumption of oven dry are as shown in table 1 for Shanghai Precision Scientific Apparatus Co., Ltd, the SH-10A) water content of detection reference solid residue CD1 by moisture determination instrument.
Described energy consumption is meant to dry removes 1 kilogram the coal that water consumed, and unit is a kg/kg.
Embodiment 2
With water content is that the waste liquid (1 ton) of the preparation of ethanol by fermentation of cassava of 95 weight % joins diaphragm filter press (Jingjin Filter Press Group Co.,Ltd, X
M AZG600/1500 * 2000U
B K) in filter, the quantity of common filter plate in the described diaphragm filter press (Jingjin Filter Press Group Co.,Ltd, chamber filter plate) is 60, membrane filter plate (Jingjin Filter Press Group Co.,Ltd, 1250 types) quantity is 60, and common filter plate and membrane filter plate are spaced; The condition of described filtration comprises that the pressure of filtration is 0.4MPa, and filter time is 8 hours, obtains filter cake; Charge into the extrusion medium air afterwards in membrane filter plate, the filter cake after filtering is squeezed, the pressure of described squeezing is 25MPa, and the time of squeezing is 0.2 hour, the filter cake A2 that obtains.
(result is as shown in table 1 for Shanghai Precision Scientific Apparatus Co., Ltd, the SH-10A) water content of detection filter cake A2 by moisture determination instrument.
The filter cake A2 that obtains is put into (Zhengzhou Wangu Machinery Co., Ltd. in the air-flow tumble-type dryers, JB/T10279-2001) dry, the temperature of oven dry is 180 ℃, the time of oven dry is 0.5 hour, obtain solid residue D2, (water content of solid residue D2 and the energy consumption of oven dry are as shown in table 1 for Shanghai Precision Scientific Apparatus Co., Ltd, the SH-10A) water content of detection solid residue D2 by moisture determination instrument.
Described energy consumption is meant to dry removes 1 kilogram the coal that water consumed, and unit is a kg/kg.
Embodiment 3
With water content is that the waste liquid (1 ton) of the preparation of ethanol by fermentation of cassava of 95 weight % joins diaphragm filter press (Jingjin Filter Press Group Co.,Ltd, X
M AZG600/1500 * 2000U
B K) in filter, the quantity of common filter plate in the described diaphragm filter press (Jingjin Filter Press Group Co.,Ltd, chamber filter plate) is 55, membrane filter plate (Jingjin Filter Press Group Co.,Ltd, 1250 types) quantity is 55, and common filter plate and membrane filter plate are spaced; The condition of described filtration comprises that the pressure of filtration is 0.5MPa, and filter time is 6 hours, obtains filter cake; Charge into the extrusion medium air afterwards in membrane filter plate, the filter cake after filtering is squeezed, the pressure of described squeezing is 20MPa, and the time of squeezing is 0.5 hour, the filter cake A3 that obtains.
(result is as shown in table 1 for Shanghai Precision Scientific Apparatus Co., Ltd, the SH-10A) water content of detection filter cake A3 by moisture determination instrument.
The filter cake A3 that obtains is put into (Zhengzhou Wangu Machinery Co., Ltd. in the air-flow tumble-type dryers, JB/T10279-2001) dry, the temperature of oven dry is 120 ℃, the time of oven dry is 0.5 hour, obtain solid residue D3, (water content of solid residue D3 and the energy consumption of oven dry are as shown in table 1 for Shanghai Precision Scientific Apparatus Co., Ltd, the SH-10A) water content of detection solid residue D3 by moisture determination instrument.
Described energy consumption is meant to dry removes 1 kilogram the coal that water consumed, and unit is a kg/kg.
Table 1
| The embodiment numbering | Cake moisture (weight %) | Solid residue water content (weight %) | Energy consumption (kg/kg) |
| Embodiment 1 | 60 | 10％ | 0.17 |
| Comparative Examples 1 | 78 | 10％ | 0.31 |
| Embodiment 2 | 50 | 11％ | 0.09 |
| Embodiment 3 | 55 | 12％ | 0.12 |
As can be seen from the above table, the water content of the filter cake A1-A3 that embodiment of the invention 1-3 obtains is respectively 60 weight %, 50 weight % and 55 weight %, the water content of the reference filter cake CA1 that Comparative Examples 1 obtains is then up to 78 weight %, explanation reduces the water content that waste liquid squeezes the filter cake that obtains significantly by method provided by the invention, and embodiment 1-3 compares with Comparative Examples 1, the energy consumption of baking needed significantly reduces, and illustrates by method provided by the invention significantly to reduce the required energy consumption of recovery solid residue.
Embodiment 4-6
Detect the impurity content and the COD value of the water that squeezing is removed among the embodiment 1-3 by the following method respectively:
The detection of impurity content
The water that embodiment 1-3 squeezing is removed stirs respectively, forms suspension; Get suspension 1000 gram then, left standstill 24 hours, remove supernatant solution, and take by weighing sedimentary weight, obtain squeezing the content of impurity in the water of removal, the result is as shown in table 2.
The detection of COD value
Detect the COD value that embodiment 1-3 handles the waste water that obtains respectively by standard GB 11914-89 water quality-COD determination one potassium dichromate method, the result is as shown in table 2.
Comparative Examples 2
By the method identical with embodiment 4-6, detect impurity content and COD value that Comparative Examples 1 is handled in the waste water that obtains, the result is as shown in table 2.
Table 2
| The embodiment numbering | Impurity content (weight %) | COD value (mg/L) |
| Embodiment 4 | 0.06％ | 35000 |
| Comparative Examples 2 | 0.55％ | 76000 |
| Embodiment 5 | 0.04％ | 34000 |
| Embodiment 6 | 0.05％ | 32000 |
As can be seen from Table 2, water ratio with Comparative Examples 1 squeezing removal, the impurity content of the water that embodiment of the invention 1-3 squeezing is removed and the impurity content of COD value and the significant reduction of COD value, explanation not only can significantly reduce by method provided by the invention reclaims the required energy consumption of solid residue, can also reduce the impurity content and the COD value of the water of squeezing removal significantly, thereby see and reduced the wearing and tearing of impurity, reduced maintenance cost equipment; Also reduced simultaneously environmental pressure.
Claims (4)
1, a kind of method that from the waste liquid of preparation of ethanol by fermentation of cassava, reclaims solid residue, this method comprises the water of removing in the waste liquid, obtains filter cake; Afterwards filter cake being dried, obtain solid residue, it is characterized in that, is benchmark with the gross weight of filter cake, and the water content of filter cake is less than 60 weight %; Described water content obtains by using diaphragm filter press that described waste liquid is filtered and squeezes less than the filter cake of 60 weight %; The condition of described filtration comprises that the pressure of filtration is 0.4-1MPa, and filter time is 2-8 hour; The condition of described squeezing comprises that the pressure of squeezing is 10-25MPa, and the time of squeezing is 0.2-2 hour.
2, method according to claim 1, wherein, the condition of described filtration comprises that the pressure of filtration is 4-6 hour for the 0.5-0.8MPa filtration time.
3, method according to claim 1, wherein, the condition of described squeezing comprises that the pressure of squeezing is 15-20MPa, the time of squeezing is 0.5-1 hour.
4, method according to claim 1, wherein, the condition of described oven dry comprises that bake out temperature is 100-200 ℃, drying time is 0.2-2 hour.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710304356A CN100593975C (en) | 2007-12-27 | 2007-12-27 | Method for recovering solid residue from waste liquor of alcohol prepared by fermenting cassava |
| PCT/CN2008/073721 WO2009082960A1 (en) | 2007-12-27 | 2008-12-25 | A method for recovering solid residue from waste liquor resulted from ethanol production through cassava fermentation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710304356A CN100593975C (en) | 2007-12-27 | 2007-12-27 | Method for recovering solid residue from waste liquor of alcohol prepared by fermenting cassava |
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| Publication Number | Publication Date |
|---|---|
| CN101288438A CN101288438A (en) | 2008-10-22 |
| CN100593975C true CN100593975C (en) | 2010-03-17 |
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| CN200710304356A Active CN100593975C (en) | 2007-12-27 | 2007-12-27 | Method for recovering solid residue from waste liquor of alcohol prepared by fermenting cassava |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100593975C (en) * | 2007-12-27 | 2010-03-17 | 中粮集团有限公司 | Method for recovering solid residue from waste liquor of alcohol prepared by fermenting cassava |
| WO2019038469A1 (en) * | 2017-08-23 | 2019-02-28 | Outotec (Finland) Oy | A method for operating a filter press and a filter press |
| CN110916238B (en) * | 2019-12-05 | 2022-07-01 | 云南中烟工业有限责任公司 | Tobacco stem pretreatment method applied to high-speed paper machine and white cardboard for cigarettes |
| CN113880393B (en) * | 2021-12-06 | 2022-05-13 | 恩彻尔(天津)环保科技有限公司 | Sludge drying machine for sewage treatment |
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| CN101037239A (en) * | 2007-04-26 | 2007-09-19 | 肥城金塔机械有限公司 | Method for reclaiming dry object from alcohol waste liquid |
| CN100593975C (en) * | 2007-12-27 | 2010-03-17 | 中粮集团有限公司 | Method for recovering solid residue from waste liquor of alcohol prepared by fermenting cassava |
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- 2008-12-25 WO PCT/CN2008/073721 patent/WO2009082960A1/en active Application Filing
Non-Patent Citations (2)
| Title |
|---|
| 木薯淀粉渣的干燥特性探讨. 刘琨.广西大学学报（自然科学版），第26卷第3期. 2001 |
| 木薯淀粉渣的干燥特性探讨. 刘琨.广西大学学报(自然科学版)，第26卷第3期. 2001 * |
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| CN101288438A (en) | 2008-10-22 |
| WO2009082960A1 (en) | 2009-07-09 |
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