CN101066816A - Process of treating waste water from starch production - Google Patents
Process of treating waste water from starch production Download PDFInfo
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- CN101066816A CN101066816A CN 200710049290 CN200710049290A CN101066816A CN 101066816 A CN101066816 A CN 101066816A CN 200710049290 CN200710049290 CN 200710049290 CN 200710049290 A CN200710049290 A CN 200710049290A CN 101066816 A CN101066816 A CN 101066816A
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- light liquid
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Abstract
The process of treating waste water from starch production features that the light liquid from a disc separator or a cyclonic separator in the protein separating and concentrating process includes neutralizing the light liquid to isoelectric point and pH value of 7.0+/-0.2, and the subsequent filtering to obtain oversize and water for reuse in production. The present invention can reduce water consumption and reduce sewage exhaust.
Description
Technical field
The invention belongs to the method for wastewater treatment of machine-processed starch production process.
Background technology
At present, the enterprise that the new fresh potatoes of domestic usefulness prepares starch, adopt following technical process mostly: raw material → cleaning allowances for bark → fragmentation → slag, liquid separation → protein separation, concentrate → dehydration, oven dry → packing.This method has that technical process is short, equipment is few and little, the production efficiency advantages of higher, but its maximum weak point is that former water consumption is big, produce one ton of starch of the every production of enterprise preferably and need consume 13 tons in former water, and most of producer one ton of starch water consumption of every production is all greater than 15 tons.It is big to consume the former water yield, and the sewage quantity of generation is also big; In order to save the no small wastewater treatment spending of quantity, domestic a large amount of Starch Production enterprise is left intact, direct discharging of waste water is carried out the natural oxidation degraded to the natural oxidation pool, though amount of starch enterprise is equipped with sewage disposal facility, but its ability can only be handled a small amount of sewage, major part still is put into the natural oxidation pool, and this just causes the groundwater pollution around the starch enterprise serious, and the air that has an area of several kilometers is full of foul smell.
The conventional this technology that adopts, the flow process section of water is: clean allowance for bark, broken, slag liquid separates and protein separation.In above-mentioned flow process, the corporate boss will use former water or light liquid that will disc separator is separated in the protein separation process to allowance for bark usefulness for cleaning, preceding method consumes a large amount of former water, back rule is owing to contain amount of starch and a large amount of plant protein in the light liquid, it is more much bigger than preceding method to allowance for bark the sewage detrimental impurity that flow process comes out through cleaning, more how to have brought difficulty to sewage disposal.
Summary of the invention
The technical problem to be solved in the present invention provides a kind ofly to be come out a large amount of starch, proteins extraction in the waste water, reduce organic content in the waste water, adds the method for wastewater treatment of the recycle of big flood.
The present invention solves the problems of the technologies described above with following technical scheme: will be neutralized to iso-electric point by the light liquid of disc separator output in protein separation and concentration flow path section with alkali or salt, the pH value is controlled between 5.6～14.With disc separator or swirler above-mentioned light liquid is forced precipitate and separate again, draws light liquid and heavy-fluid, light liquid through in and after the filtration treatment screen overflow and water of productive use, water of productive use is for recycle, heavy-fluid is managed elsewhere.
With method treatment mechanism starch production wastewater of the present invention, the water that obtains can reach fully for broken, slag liquid separates, the standard of three flow process sections of protein separation cycling use of water, only need to replenish a spot of loss water and get final product fine meeting the needs of production, not only obviously reduced the sewage emissions amount, reduced and handled the cost of waste water, and effectively reduced the consumption of former water and the production cost of starch.
Embodiment
In the production process of potato starch, the separating machine equipment that is absolutely necessary, wherein disc separator is again with the most use a kind of.When producing starch, disc separator obtains heavy-fluid and light liquid after solidliquid mixture is separated, and wherein heavy-fluid contains dense starch and a spot of protein, can utilize prior art that protein and starch are extracted.And light liquid is because of containing detrimental impurity such as big water gaging and plant protein, small portion of residual starch and other materials of minute quantity, if directly use for production cycle or directly enter oxidation pond without just handling, light liquid will become the primary pollution source of potato starch manufacturing enterprise.Disc separator in protein separation and concentration flow path section separates in the light liquid that obtains especially, and the problem that detrimental impurity is many is even more serious.
Protein has electric charge in solution, form Kennelly heaviside layer around its molecule, repels mutually between the protein molecule, so protein is difficult for precipitation; Have only when protein soln during in iso-electric point, the protein molecule neutral, the Kennelly heaviside layer around it is damaged, and the dissolving of protein in water at this moment is minimum, and most protein can precipitatings come out.This law is utilized proteinic this characteristic, to disc separator separate light liquid handle, again with the light liquid handled supply production cycle utilization, reduce the usage quantity of sewage emissions amount and former water in a large number.
Embodiment 1:
Test period: on January 2nd, 2006
12 ℃ of envrionment temperatures
(1) raw material is prepared: be ready to by the isolated light liquid 10m of disc separator
3This light liquid is sent in the storage pond; When light liquid flows to the storage pond, get 0.2m with the continuous sampling method
3The light liquid sample, again from this 0.2m
3Take out 1000ml in the light liquid and under 150 ℃, boil volatilization moisture content, after moisture content is boiled dry substantially, again under 200 ℃ with resistates oven dry, dry two hours postcooling, weigh, get resistates quality 8.33g, the concentration of light liquid sample is as calculated: 8.33g/1000ml=0.00833g/ml=8.33kg/m
3In addition again from 0.2m
3Get in the light liquid sample 30ml with neutral distilled water 20ml dilution after, recording the sample pH value value is 5.6.
(2) be neutralized to iso-electric point: the weight concentration of using permanent good medicine to melt to send out company limited to produce is 40% NaoH solution 10kg, be diluted with water to 2%, turn on pump pumps into the storage pond with light liquid, adds NaoH solution simultaneously, survey light liquid pH value continuously at the pump discharge place, keeping light liquid pH value is 9.7 ± 0.20.
(3) disc separator separates: DPF530 type disc separator, 4650 rev/mins of rotating speeds, separating factor 4800 are used in this test.Through separating of disc separator light liquid and heavy-fluid, use and above identical method continuous sampling and chemical examination, recording light liquid concentration is 0.35kg/m
3, pH value 9.63, heavy-fluid concentration are 12.49kg/m
3, pH value 9.63 gets light liquid 2.5m at last
3, heavy-fluid 6.6m
3
(4) neutralization and filter: with neutral clear water electrochemical company limited product, weight concentration being contained in Wenzhou is that 31% hydrochloric acid is diluted to 2%, be continuously pumped into light liquid and add Hcl solution simultaneously, make light liquid pH value reach 7.0 ± 0.2, then by 150 order nylon screens, obtain neutralizing light liquid after filtering is 6.91 through sampled measurements light liquid actual pH.
(5) be used for the wash water of disc separator through the light liquid of above processing, produce out 4 tons of starch products as a trial, its protein content is 3.1%, and 4 every square centimeter of mottle numbers are first grade by the starch grade classification, near the top grade product.The water body that can be used as the wash water of disc separator concerning Starch Production just can be used on other each production links.
Embodiment 2:
Test period on February 10th, 2006
10 ℃ of envrionment temperatures
Equipment used, chemical reagent, sample mode, assay method and each step operation are all identical with embodiment 1.Below reflect the various data situation of embodiment with table 1:
Table 1
Embodiment 3:
Test period: on March 20th, 2006
Envrionment temperature: 15 ℃
Equipment used has been except that having replaced the disc separator with swirler, all the other equipment, used chemical reagent, and sample mode, assay method and each step operation are with embodiment 1.Below reflect the various data situation of test with table 2:
Table 2
Embodiment 4:
Test period: on March 20th, 2006
Envrionment temperature: 15 ℃
Equipment used, chemical reagent, sample mode, assay method and each step operation are with embodiment 1.Below with the various data situation of table 3 reflection present embodiment:
Table 3
More than several embodiment explanation, the waste water through the application's method was handled can be used for cyclic production, has significantly reduced potato starch factory sewage emissions amount, to protecting environment great role is arranged.
Claims (1)
1. the method for wastewater treatment of a machine-processed Starch Production is characterized in that will being neutralized to iso-electric point by the light liquid of disc separator output in protein separation and concentration flow path section with alkali or salt, and the pH value is controlled between 5.6～14; With disc separator or swirler above-mentioned light liquid is forced precipitate and separate again, draws light liquid and heavy-fluid, light liquid through in and filtration treatment after screen overflow and water of productive use, neutral pH value is controlled at 7.0 ± 0.2, heavy-fluid is managed elsewhere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710049290 CN101066816A (en) | 2007-06-08 | 2007-06-08 | Process of treating waste water from starch production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710049290 CN101066816A (en) | 2007-06-08 | 2007-06-08 | Process of treating waste water from starch production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101066816A true CN101066816A (en) | 2007-11-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN 200710049290 Pending CN101066816A (en) | 2007-06-08 | 2007-06-08 | Process of treating waste water from starch production |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102659233A (en) * | 2012-05-04 | 2012-09-12 | 泰祥集团技术开发有限公司 | Method for removing proteins in protein-enriched wastewater |
-
2007
- 2007-06-08 CN CN 200710049290 patent/CN101066816A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102659233A (en) * | 2012-05-04 | 2012-09-12 | 泰祥集团技术开发有限公司 | Method for removing proteins in protein-enriched wastewater |
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