CN112279451A - Method for treating coix seed oil production sewage - Google Patents
Method for treating coix seed oil production sewage Download PDFInfo
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- CN112279451A CN112279451A CN201910674206.5A CN201910674206A CN112279451A CN 112279451 A CN112279451 A CN 112279451A CN 201910674206 A CN201910674206 A CN 201910674206A CN 112279451 A CN112279451 A CN 112279451A
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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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
- 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
- C02F2103/322—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters from vegetable oil production, e.g. olive oil production
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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Abstract
The invention relates to a method for treating coix seed oil production sewage, which comprises the following steps: 1) salting out and demulsifying, wherein after the refined sewage enters a demulsification tank, a stirrer of the demulsification tank is started, industrial-grade NaCl accounting for 2-10% of the total weight of the refined sewage is slowly added for 1-60 minutes, the refined sewage is continuously stirred for 5-2 hours, the stirring is stopped, the refined sewage is kept stand for 30-24 hours, a drain valve at the bottom of the demulsification tank is opened, the lower clear liquid is put into a comprehensive regulating reservoir, a visual cup of the demulsification tank is observed until floccules appear, the drain valve of the demulsification tank is closed, a residue discharge valve of the demulsification tank is opened, and the floccules are discharged into bags and drained for outward transportation; 2) air floatation, namely conveying the sewage in the comprehensive adjusting tank to an air floatation device, starting a scum scraper to scrape upper-layer scum into a scum falling tank, collecting the scum and discarding the scum, and overflowing lower-layer clear liquid to a buried biochemical treatment device; 3) and (3) performing biochemical treatment, wherein the lower clear liquid after air floatation flows into an oxidation tank of the buried biochemical treatment device, under the aerobic condition, the clear liquid is repeatedly contacted with a biological film on the surface of the filler in the oxidation tank, and the clear liquid is purified and discharged to a sewage pipe network after reaching the standard.
Description
The technical field is as follows:
the invention relates to a method for treating production sewage in the process of producing lipid medicines, in particular to a method for treating the production sewage of coix seed oil.
Background art:
the sewage produced in the oil industry production is produced in the oil refining and deep processing processes, is organic sewage with high oil content, contains emulsified oil, soluble oil, saponin and the like, has large water quality change range, high COD (chemical oxygen demand) which can reach tens of thousands or even hundreds of thousands, has poor biodegradability and has large treatment difficulty. The industrial combination of pretreatment, oil separation, air flotation, anaerobic treatment, aerobic treatment and other processes can meet the treatment requirements, wherein the most critical step is pretreatment, and the demulsification degree in the process directly has great influence on the subsequent treatment process and effect. According to different grease structures, demulsification can be carried out by using methods such as membrane filtration, ultrasound, acidification and the like, but some methods have the defects of high cost, poor practicability, small treatment capacity, insufficient safety and the like, and are not suitable for industrial treatment of production sewage. The actual problems of enterprises can be finally solved only by the sewage treatment process with good treatment effect, low cost and safety.
The invention aims to solve the technical problem of a method for treating coix seed oil production sewage.
The coix seed oil is the active component of Kanlite injection and coix seed oil medicine for injection, and has obvious inhibiting effect on various transplanted tumors and human tumor cell lines transplanted to nude mice, and certain immunity enhancing and pain relieving effects.
At present, the production of the coix seed oil mainly adopts a process of extracting the coix seed oil by supercritical carbon dioxide, and the process comprises the steps of drying coix seeds, then carrying out coarse crushing, sieving and then carrying out supercritical carbon dioxide extraction to obtain the coix seed oil.
The sewage produced in the production of the coix seed oil mainly comes from the process of refining the coix seed oil, and the sewage is milky turbid liquid and contains high-concentration fatty acid salts, oil and organic solvents.
The existing sewage treatment process comprises the steps of adding acid into coix seed oil refining wastewater for acidification, adding alkali for neutralization after oil separation, entering a comprehensive adjusting tank for adjustment, entering an integrated biochemical treatment device after air floatation, and discharging the wastewater after reaching biochemical standards into a sewage pipe network.
The amount of fatty acid salt and grease in the wastewater is unstable, the COD of the wastewater treated by the method is higher than 500mg/L, the wastewater can not reach the three-level discharge standard of the integrated wastewater discharge standard, and the problems of enlarging biochemical capacity and prolonging biochemical period are solved. The process has the defects of small treatment amount, poor treatment effect, potential safety hazard due to the use of strong acid and the like.
The invention content is as follows:
the present invention improves the existing sewage treatment process, and the improved process adopts NaCl salting-out demulsification, regulation in a regulating tank, air floatation and biochemical treatment to reach the discharge standard, and then the sewage is discharged into a sewage pipe network.
The process of the invention adopts NaCl salting-out demulsification to greatly reduce COD of the wastewater after demulsification and reduce the treatment load of a biochemical pool. The treatment capacity is large, the period is short, the cost is low, the COD of the treated sewage is lower than 100mg/L, the first-level discharge standard of < the comprehensive discharge standard of sewage > is achieved, and the safety risk caused by using strong acid is eliminated.
Therefore, the invention provides a method for treating coix seed production sewage, which comprises the following steps:
1 salting out and demulsifying
After the refined sewage enters the demulsification tank, starting a stirrer of the demulsification tank, and slowly adding industrial-grade NaCL accounting for 5 percent of the total amount of the sewage according to the amount of the refined sewage in the storage tank, wherein the addition is finished in about 10 minutes. And continuing stirring for more than 30 minutes, stopping stirring, standing for more than 30 minutes, opening a water drain valve at the bottom of the tank, draining the lower layer clear liquid to a comprehensive regulating tank, observing a visual cup of the demulsification tank until floccules appear, and closing the water drain valve of the demulsification tank. And opening a slag discharge valve of the demulsification tank, discharging the emulsion into a bag, draining, and carrying out outward treatment.
2 air flotation
And (4) starting the air floatation device, operating for 5-10 minutes, and then starting a lifting pump to convey the sewage in the comprehensive adjusting tank to the air floatation device. And opening the residue scraper to scrape the upper-layer scum into a residue falling groove for collection and outward transportation, and overflowing the lower-layer clear liquid to the buried biochemical treatment device.
3 Biochemical treatment
The effluent of the air floatation enters an oxidation tank, under the aerobic condition, the sewage is repeatedly contacted with the biomembrane on the surface of the filler, so that the sewage is purified and discharged to a sewage pipe network after reaching the standard.
The following is an explanation of the term of the present invention:
the refining sewage is sewage generated in the process of refining the coix seed oil.
A demulsification tank: the sewage is discharged into the tank body, and the demulsification is finished in the tank body to form a demulsification tank.
Technical grade NaCl technical grade sodium chloride
A comprehensive adjusting tank: the sewage discharged by enterprises in different time and batches is very different, and the sewage is guided into the regulating tank to be uniformly regulated and treated, so that the effects of preliminary sedimentation and separation can be achieved, and the water quantity and the water quality are relatively stable.
A visual cup: the industrial pipeline device accessory comprises a transparent window for observing the flow of media such as liquid, gas, steam and the like. An air floatation device: air is introduced into water in the form of micro bubbles, so that the micro bubbles are adhered to particles suspended in the water to form a water-gas-particle three-phase mixed system, and after the bubbles are adhered to the particles, the particles float upwards on the water surface when the density is less than that of the water to form a scum layer which is separated from the water.
Slag scraping machine: and a device for removing scum on the surface of the floatation tank. Suspended impurities in the sewage in the air floatation tank float out of the water surface after treatment to form waste residues, the waste residues are required to be removed after being accumulated to a certain degree, the residue scraping machine is located above the isolation area, and the waste residues are periodically scraped into a residue discharging groove to be discharged through reciprocating motion so as to achieve sewage purification.
A slag falling groove: and collecting waste residues scraped by the slag scraper.
Overflowing: full of water flows outwards
Buried biochemical treatment device: the effluent quality treated by the device reaches the national discharge standard.
An oxidation pond: the oxidation pond is characterized in that a filler is fully distributed with a biological film, sewage is in wide contact with the biological film, organic pollutants in the sewage are removed under the action of the metabolism function of microorganisms on the biological film, and the sewage is purified.
By using the NaCl salting-out demulsification technology, COD in the coix seed oil refining wastewater is remarkably reduced, the wastewater treatment steps are reduced, the treatment load of a biochemical pool is reduced, the biochemical treatment period is shortened, the sewage discharge water quality is improved, the COD can reach the first-level discharge standard of GB8978< comprehensive sewage discharge standard >, and the subsequent treatment cost of sewage discharge through a nano-tube is reduced.
The industrial combination of pretreatment, oil separation, air flotation, anaerobic treatment, aerobic treatment and other processes can meet the treatment requirements, wherein the most critical step is pretreatment, and the demulsification degree in the process directly has great influence on the subsequent treatment process and effect. According to different grease structures, demulsification can be carried out by using methods such as membrane filtration, ultrasound, acidification and the like, but some methods have the defects of high cost, poor practicability, small treatment capacity, insufficient safety and the like, and are not suitable for industrial treatment of production sewage. The actual problems of enterprises can be finally solved only by the sewage treatment process with good treatment effect, low cost and safety. The method for treating the coix seed oil has low production sewage cost and good treatment effect, and avoids potential safety hazards caused by using strong acid, strong alkali and the like.
Description of the drawings:
FIG. 1 is a process flow diagram of the present invention
The specific implementation mode is as follows:
the invention is further illustrated by the following examples, which are not to be construed as limiting the invention thereto.
Example 1
1 salting out and demulsifying
Pumping 1000kg of refined sewage into a demulsification tank, starting a stirrer of the demulsification tank, slowly adding industrial-grade NaCL50kg accounting for 5 percent of the total amount of the sewage, and finishing the adding within about 10 minutes. And continuing stirring for 30 minutes, stopping stirring, standing for more than 30 minutes, opening a water drain valve at the bottom of the tank, draining the lower layer clear liquid to a comprehensive regulating tank, observing a visual cup of the demulsification tank until floccules appear, and closing the water drain valve. And opening a slag discharge valve of the demulsification tank, discharging the emulsion into a bag, draining, and transporting outside.
2 air flotation
And (4) starting the air floatation device, operating for 5-10 minutes, and then starting a lifting pump to convey the sewage in the comprehensive adjusting tank to the air floatation device. And opening the residue scraper to scrape the upper-layer scum into a residue falling groove for collection and outward transportation, and overflowing the lower-layer clear liquid to the buried biochemical treatment device.
3 Biochemical treatment
And (3) the air-floated effluent enters an oxidation tank, under the aerobic condition, the sewage is repeatedly contacted with the biomembrane on the surface of the filler, so that the sewage is purified and discharged to a sewage pipe network in a development area after reaching the standard.
The COD of the sewage discharged by the sewage treated by the invention can reach the first-level discharge standard of GB8978< comprehensive sewage discharge standard > of 100 mg/L. The specific implementation effect is as follows:
salting-out demulsification and sewage treatment effects of coix seed oil refining wastewater
Example 2
1 salting out and demulsifying
Pumping 5000kg of refined sewage into a demulsification tank, starting a stirrer of the demulsification tank, slowly adding industrial-grade NaCL250kg accounting for 5 percent of the total amount of the sewage, and finishing the adding within about 20 minutes. And continuing stirring for 1 hour, stopping stirring, standing for more than 1 hour, opening a drain valve at the bottom of the tank, draining the lower layer clear liquid to a comprehensive regulating tank, observing a visual cup of the demulsification tank until floccules appear, and closing the drain valve. And opening a slag discharge valve of the demulsification tank, discharging the emulsion into a bag, draining, and transporting outside.
2 air flotation
And (4) starting the air floatation device, operating for 5-10 minutes, and then starting a lifting pump to convey the sewage in the comprehensive adjusting tank to the air floatation device. And opening the residue scraper to scrape the upper-layer scum into a residue falling groove for collection and outward transportation, and overflowing the lower-layer clear liquid to the buried biochemical treatment device.
3 Biochemical treatment
And (3) the air-floated effluent enters an oxidation tank, under the aerobic condition, the sewage is repeatedly contacted with the biomembrane on the surface of the filler, so that the sewage is purified and discharged to a sewage pipe network in a development area after reaching the standard.
The COD of the sewage discharged by the sewage treated by the invention can reach the first-level discharge standard of GB8978< comprehensive sewage discharge standard > of 100 mg/L. The specific implementation effect is as follows:
salting-out demulsification and sewage treatment effects of coix seed oil refining wastewater
Claims (3)
1. A method for treating coix seed oil production sewage is characterized by comprising the following steps:
1) the salting-out demulsification is carried out,
after the refined sewage enters the emulsion breaking tank, starting an emulsion breaking tank stirrer, slowly adding industrial-grade NaCl accounting for 2-10% of the total weight of the refined sewage, finishing the addition within 1-60 minutes, continuing to stir for 5-2 hours, stopping stirring, standing for 30-24 minutes, opening a drain valve at the bottom of the emulsion breaking tank, putting a lower layer clear liquid into a comprehensive regulating tank, observing a visual cup of the emulsion breaking tank until floccules appear, closing the drain valve of the emulsion breaking tank, opening a slag discharge valve of the emulsion breaking tank, discharging the flocculent emulsives into bags, draining water, and carrying out outward;
2) the air floatation is carried out on the mixture,
conveying the sewage in the comprehensive adjusting tank to an air floatation device, starting a slag scraper to scrape upper-layer scum into a scum falling groove, collecting the scum and discarding the scum, and overflowing lower-layer clear liquid to a buried biochemical treatment device;
3) the biochemical treatment is carried out on the mixture,
and the lower clear liquid after air floatation flows into an oxidation tank of the buried biochemical treatment device, under the aerobic condition, the clear liquid is repeatedly contacted with a biological film on the surface of the filler in the oxidation tank, and the clear liquid is purified and discharged to a sewage pipe network after reaching the standard.
2. Method according to claim 1, characterized in that the method steps are as follows:
1) salting out and demulsifying
Pumping 1000kg of refined sewage into a demulsification tank, starting a stirrer of the demulsification tank, slowly adding industrial-grade NaCL50kg with the sewage amount being 5 percent, finishing the adding within about 10 minutes, continuing to stir for 30 minutes, stopping stirring, standing for more than 30 minutes, opening a drain valve at the bottom of the tank, draining the lower layer clear liquid to a comprehensive adjusting tank, observing a visual cup of the demulsification tank until floccules appear, closing the drain valve, opening a slag discharge valve of the demulsification tank, discharging the emulsibles, bagging, draining and transporting outside,
2) air-float
Starting the air floatation device, operating for 5-10 minutes, then starting the lift pump to send the sewage in the comprehensive adjusting tank to the air floatation device, starting the slag scraper to scrape the upper-layer floating slag into a slag falling groove for collection and outward transportation, overflowing the lower-layer clear liquid to the buried biochemical treatment device,
3) biochemical treatment
And (3) the air-floated effluent enters an oxidation tank, under the aerobic condition, the sewage is repeatedly contacted with the biomembrane on the surface of the filler, so that the sewage is purified and discharged to a sewage pipe network in a development area after reaching the standard.
3. Method according to claim 1, characterized in that the method steps are as follows:
1) salting out and demulsifying
Pumping 5000kg of refined sewage into a demulsification tank, starting a stirrer of the demulsification tank, slowly adding industrial-grade NaCL250kg with the sewage amount being 5 percent, continuously stirring for 1 hour after about 20 minutes, stopping stirring, standing for more than 1 hour, opening a drain valve at the bottom of the tank, draining the lower layer clear liquid to a comprehensive adjusting tank, observing a visual cup of the demulsification tank until floccules appear, closing the drain valve, opening a slag discharge valve of the demulsification tank, discharging the emulsions, bagging, draining and transporting outside,
2) air-float
Starting the air floatation device, operating for 5-10 minutes, then starting the lift pump to send the sewage in the comprehensive adjusting tank to the air floatation device, starting the slag scraper to scrape the upper-layer floating slag into a slag falling groove for collection and outward transportation, overflowing the lower-layer clear liquid to the buried biochemical treatment device,
3) biochemical treatment
And (3) the air-floated effluent enters an oxidation tank, under the aerobic condition, the sewage is repeatedly contacted with the biomembrane on the surface of the filler, so that the sewage is purified and discharged to a sewage pipe network in a development area after reaching the standard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910674206.5A CN112279451A (en) | 2019-07-25 | 2019-07-25 | Method for treating coix seed oil production sewage |
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| CN201910674206.5A CN112279451A (en) | 2019-07-25 | 2019-07-25 | Method for treating coix seed oil production sewage |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070185219A1 (en) * | 2005-12-21 | 2007-08-09 | Jean-Francois Argillier | Method of Breaking Aqueous Heavy Crude Emulsions by Adding Polar Solvents |
| CN103436350A (en) * | 2013-07-20 | 2013-12-11 | 烟台大学 | Aqueous enzymatic method for extracting rapeseed oil and recovering protein |
| CN206915935U (en) * | 2017-03-28 | 2018-01-23 | 苏州博瑞水处理有限公司 | Emulsifying liquid waste water processing system |
-
2019
- 2019-07-25 CN CN201910674206.5A patent/CN112279451A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070185219A1 (en) * | 2005-12-21 | 2007-08-09 | Jean-Francois Argillier | Method of Breaking Aqueous Heavy Crude Emulsions by Adding Polar Solvents |
| CN103436350A (en) * | 2013-07-20 | 2013-12-11 | 烟台大学 | Aqueous enzymatic method for extracting rapeseed oil and recovering protein |
| CN206915935U (en) * | 2017-03-28 | 2018-01-23 | 苏州博瑞水处理有限公司 | Emulsifying liquid waste water processing system |
Non-Patent Citations (2)
| Title |
|---|
| 崔志瀓等: "《工业废水处理》", 31 October 1989, 冶金工业出版社 * |
| 郭亚男等: "植物油加工车间废水处理工艺技术", 《粮食与食品工业》 * |
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