CN112624449A - Pretreatment method of high-concentration garlic wastewater - Google Patents

Pretreatment method of high-concentration garlic wastewater Download PDF

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Publication number
CN112624449A
CN112624449A CN202011638260.3A CN202011638260A CN112624449A CN 112624449 A CN112624449 A CN 112624449A CN 202011638260 A CN202011638260 A CN 202011638260A CN 112624449 A CN112624449 A CN 112624449A
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China
Prior art keywords
wastewater
garlic
concentration
pretreatment method
cod
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Pending
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CN202011638260.3A
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Chinese (zh)
Inventor
李锋民
顾书瑞
郑宇�
郭得松
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Ocean University of China
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Ocean University of China
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Priority to CN202011638260.3A priority Critical patent/CN112624449A/en
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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
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • 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
    • C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/46—Apparatus for electrochemical processes
    • C02F2201/461—Electrolysis apparatus
    • C02F2201/46105—Details relating to the electrolytic devices
    • C02F2201/4612—Controlling or monitoring
    • C02F2201/46125—Electrical variables
    • C02F2201/4614—Current
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/44—Time

Abstract

The invention discloses a pretreatment method of high-concentration garlic wastewater, belonging to the technical field of wastewater treatment. Through the electrochemistry coupling persulfate oxidation technology, an electrolytic device is constructed in the waste water, meanwhile, the potassium hydrogen persulfate composite salt is added, fully stirred and reacted for a period of time, and finally the waste water is discharged after standing for a period of time. The invention realizes COD in the garlic wastewaterCrThe high-efficiency removal and the full degradation of bacteriostatic substances such as garlicin and decomposition intermediates thereof greatly improve the biodegradability of the wastewater, thereby meeting the requirements of subsequent biological treatment of garlic processing enterprises. Therefore, the method has the advantages of high efficiency in removing high-concentration garlic wastewater, easiness in operation, no secondary pollution, low treatment cost and the like, and has wide application prospects in garlic processing enterprises.

Description

Pretreatment method of high-concentration garlic wastewater
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a pretreatment method of high-concentration garlic wastewater.
Background
COD of garlic wastewaterCrThe concentration is up to tens of thousands of milligrams per liter, and contains a plurality of sulfur-containing compounds such as allicin, which is a characteristic substance of garlic, and disulfide and trisulfide in allicin have strong bactericidal action and can penetrate cell membrane of bacteriaWhen the bacteria enter cytoplasm, enzyme containing sulfhydryl is oxidized, so that the bacteria lack cysteamine and cannot perform biological oxidation, cell division of the bacteria is inhibited, metabolism of the bacteria is damaged, bacterial sulfhydryl is inactivated, growth and reproduction of the bacteria are influenced, and a conventional biochemical treatment method is difficult to adopt. At present, garlic wastewater is researched less at home and abroad, mature treatment processes are less, and a high-efficiency treatment process is sought, so that high-efficiency removal of refractory organic matters in the garlic wastewater is realized, and the biodegradability of the wastewater is improved, so that the garlic wastewater reaches the standard and is discharged more importantly.
For high-concentration garlic wastewater generated in the garlic processing process, pollutants in the wastewater are difficult to completely remove only by adopting a single treatment technology, and the treatment cost is high. Therefore, the research of the combined treatment of the garlic wastewater by two or even three treatment technologies is increasing and will gradually become the mainstream research trend for a period of time in the future.
Disclosure of Invention
The invention aims to provide a pretreatment method of high-concentration garlic wastewater, which realizes high-efficiency purification of the high-concentration garlic wastewater by an electrochemical coupling persulfate oxidation technology. Aiming at the problems of poor effect, high cost and the like of a single treatment method, the electrochemical oxidation method and the persulfate oxidation method are coupled to treat the garlic wastewater, so that the persulfate can be fully utilized as an electrolyte to enhance the electrolysis efficiency, and the anode can be used for electrically activating the persulfate, thereby reducing the activation cost.
The operation scheme of the invention is as follows:
1) adjusting the pH value of the wastewater to 6-9;
2) an anode and a cathode are placed in the wastewater to construct an electrolysis device;
3) adding potassium hydrogen persulfate composite salt into the wastewater, electrifying, fully stirring and reacting for a period of time;
4) and (5) standing for a period of time, and discharging the wastewater.
Preferably, COD of the wastewater in step 1)CrThe concentration was 10000-50000 mg/l, and the content of allicin and its decomposition intermediates was in the high level range of 10-200 mg/l. The distance between the polar plates of the cathode and the anode in the step 2) is 5-50 mm. The unit addition amount of the potassium hydrogen persulfate composite salt in the step 3) is 15-40 g/L; setting the current density of the electrified coupling reaction to be 20-100 milliampere/square centimeter; the rotating speed range of the stirring operation is set to be 50-200 r/min; the reaction time was set at 120-180 minutes. The standing time in the step 4) is set to be 10-20 minutes.
The electrochemical oxidation method can effectively form hydroxyl free radicals with strong oxidizing capability by means of an anode material with electrochemical activity, so that organic pollutants which are difficult to degrade and have biotoxicity in the garlic wastewater are decomposed and converted into nontoxic and biodegradable substances. The persulfate can also generate strong oxidation free radicals (such as hydroxyl free radicals, sulfate free radicals and the like) after being activated, and the strong toxicity high molecular organic pollutants with complex structures in the wastewater are oxidized and decomposed into small molecular substances with simple structures, weak toxicity or no toxicity, and even directly oxidized into carbon dioxide, water, inorganic salt and the like. The garlic wastewater is treated by the electrochemical coupling persulfate oxidation technology, so that the persulfate can be fully utilized as electrolyte to enhance the electrolysis efficiency, and the anode can be used for electrically activating the persulfate, thereby reducing the activation cost. The synchronous coupling reaction can obviously reduce the toxicity and the pollutant concentration of the wastewater and improve the biodegradability of the wastewater, thereby meeting the requirements of subsequent biological treatment of garlic processing enterprises and finally realizing the discharge up to the standard.
The invention has the following beneficial effects:
by adopting the electrochemical coupling persulfate oxidation technology and optimizing the pH value, the current density, the persulfate adding amount and the reaction time of the wastewater, the COD in the garlic wastewater is realizedCrThe method has the advantages that efficient removal of antibacterial substances such as garlicin and full degradation of decomposition intermediates of the garlicin are realized, the biodegradability of wastewater is greatly improved, the requirements of subsequent biological treatment of garlic processing enterprises are met, and the method has good economic benefits and wide application prospects.
Detailed Description
The following examples further illustrate specific embodiments of the present invention.
Example 1:
1 liter of COD was takenCr10000 mg/L of garlicPutting the garlic wastewater with the element content of 15.84 mg/L into a 5L beaker, adjusting the pH value to 6, adding 15.00 g of potassium hydrogen persulfate composite salt, putting the beaker into a cathode and anode to construct an electrolysis device, setting the distance between the plates to be 10 mm, setting the current density to be 40 milliampere/square centimeter, setting the stirring speed to be 100 revolutions per minute, fully reacting for 120 minutes, standing for 10 minutes, and discharging water. COD of effluentCr4220 mg/l, CODCrThe removal rate is 57.8 percent, the allicin content is 7.83 mg/L, the allicin removal rate is 50.6 percent, and the B/C value of the waste water is increased from 0.15 to 0.48.
Example 2:
1 liter of COD was takenCrThe method comprises the steps of putting garlic wastewater with the content of 15.84 mg/L of allicin being 10000 mg/L into a 5L beaker, adjusting the pH value to 6, adding 25.00 g of potassium hydrogen persulfate composite salt, putting the garlic wastewater into a cathode and anode to construct an electrolysis device, setting the distance between polar plates to be 10 mm, setting the current density to be 40 milliampere/square centimeter, setting the stirring speed to be 100 revolutions per minute, fully reacting for 120 minutes, standing for 10 minutes, and discharging water. COD of effluentCr3850 mg/l, CODCrThe removal rate is 61.5 percent, the allicin content is 4.82 mg/L, the allicin removal rate is 69.6 percent, and the B/C value of the waste water is increased from 0.18 to 0.60.
Example 3:
1 liter of COD was takenCrThe method comprises the steps of putting garlic wastewater with the content of 15.84 mg/L of allicin being 10000 mg/L into a 5L beaker, adjusting the pH value to 6, adding 25.00 g of potassium hydrogen persulfate composite salt, putting the garlic wastewater into a cathode and anode to construct an electrolysis device, setting the distance between polar plates to be 10 mm, setting the current density to be 60 milliampere/square centimeter, setting the stirring speed to be 100 revolutions per minute, fully reacting for 120 minutes, standing for 10 minutes, and discharging water. COD of effluentCrIs 3200 mg/l, CODCrThe removal rate is 68.0 percent, the allicin content is lower than the detection limit, and the B/C value of the waste water is increased from 0.18 to 0.68.
Example 4:
1 liter of COD was takenCrPlacing 10000 mg/L of garlic wastewater with garlicin content of 15.84 mg/L in a 5L beaker, adjusting pH to 7, adding 35.00 g of potassium hydrogen persulfate composite salt, placing in a cathode and anode to construct an electrolysis device, and arranging a polar plateThe interval was set to 10 mm, the current density was set to 60 milliampere/square centimeter, the stirring speed was set to 100 revolutions/minute, the reaction was carried out sufficiently for 120 minutes and water was discharged after standing for 10 minutes. COD of effluentCr2780 mg/l, CODCrThe removal rate is 72.2 percent, the content of the allicin is not detected, and the B/C value of the waste water is increased from 0.16 to 0.72.
Comparative example 1:
1 liter of COD was takenCrThe method comprises the steps of putting garlic wastewater with the content of 15.84 mg/L of allicin being 10000 mg/L into a 5L beaker, adjusting the pH value to 7, adding 7.10 g of anhydrous sodium sulfate, putting the garlic wastewater into a cathode and anode to construct an electrolysis device, setting the distance between polar plates to be 10 mm, setting the current density to be 70 milliampere/square centimeter, setting the stirring speed to be 100 revolutions per minute, fully reacting for 180 minutes, standing for 10 minutes, and discharging water. COD of effluentCr7220 mg/l, CODCrThe removal rate is 27.8 percent, the allicin content is 10.20 mg/L, the allicin removal rate is 35.6 percent, and the B/C value of the waste water is increased from 0.16 to 0.39.
Comparative example 2:
1 liter of COD was takenCrThe garlic wastewater with 10000 mg/L and 15.84 mg/L of allicin is put into a 5L beaker, the pH value is adjusted to 7, 33.3 g of potassium hydrogen persulfate composite salt and 13.40 g of ferrous sulfate heptahydrate are added, the stirring speed is set to be 100 r/min, the reaction is fully carried out for 180 min, and the water is discharged after the standing for 10 min. COD of effluentCr6640 mg/l, CODCrThe removal rate is 33.6 percent, the allicin content is 9.80 mg/L, the allicin removal rate is 38.1 percent, and the B/C value of the waste water is increased from 0.16 to 0.40.
The above description is only a preferred embodiment of the present patent, and it should be noted that, for those skilled in the art, several modifications can be made without departing from the present patent, and these modifications should also be regarded as the protection scope of the present patent.

Claims (8)

1. A pretreatment method of high-concentration garlic wastewater comprises the following steps:
1) adjusting the pH value of the wastewater to 6-9;
2) an anode and a cathode are placed in the wastewater to construct an electrolysis device;
3) adding potassium hydrogen persulfate composite salt into the wastewater, electrifying, fully stirring and reacting for a period of time;
4) and (5) standing for a period of time, and discharging the wastewater.
2. The pretreatment method for high concentration garlic wastewater according to claim 1, wherein the COD of the wastewater isCrThe concentration was 10000-50000 mg/l, and the content of allicin and its decomposition intermediates was in the high level range of 10-200 mg/l.
3. In the step (2), the distance between the polar plates of the cathode and the anode is 5-50 mm.
4. The pretreatment method for high concentration garlic wastewater according to claim 1, wherein the unit addition amount of the oxone complex salt in the step (3) is 15 to 40 g/l.
5. The method for pretreating high-concentration garlic wastewater according to claim 1, wherein the current density in the step (3) is 20 to 100 milliamperes per square centimeter.
6. The pretreatment method of high concentration garlic wastewater as claimed in claim 1, wherein the stirring operation in the step (3) is performed at a rotation speed ranging from 50 to 200 rpm.
7. The method for pretreating high-concentration garlic wastewater as recited in claim 1, wherein the reaction time in step (3) is 120-180 minutes.
8. The method for pretreating high-concentration garlic wastewater according to claim 1, wherein the standing time in step (4) is 10 to 20 minutes.
CN202011638260.3A 2020-12-31 2020-12-31 Pretreatment method of high-concentration garlic wastewater Pending CN112624449A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130299361A1 (en) * 2012-05-08 2013-11-14 Advanced Diamond Technologies, Inc. System and Method for Treatment of Wastewater to Destroy Organic Contaminants by a Diamond Activated Electrochemical Advanced Oxidation Process
CN108726640A (en) * 2017-04-20 2018-11-02 华中科技大学 A kind of method of electrochemistry collaboration persulfate removal Organic Pollutants in Wastewater
CN109867334A (en) * 2019-04-16 2019-06-11 北京林业大学 The method and application of catalysed particulate electrode activation persulfate under electric field driven
CN110627168A (en) * 2019-10-31 2019-12-31 上海电力大学 Method for electrochemically treating wastewater

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130299361A1 (en) * 2012-05-08 2013-11-14 Advanced Diamond Technologies, Inc. System and Method for Treatment of Wastewater to Destroy Organic Contaminants by a Diamond Activated Electrochemical Advanced Oxidation Process
CN108726640A (en) * 2017-04-20 2018-11-02 华中科技大学 A kind of method of electrochemistry collaboration persulfate removal Organic Pollutants in Wastewater
CN109867334A (en) * 2019-04-16 2019-06-11 北京林业大学 The method and application of catalysed particulate electrode activation persulfate under electric field driven
CN110627168A (en) * 2019-10-31 2019-12-31 上海电力大学 Method for electrochemically treating wastewater

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
本社: "《2012国家重点环境保护实用技术及示范工程汇编》", 31 July 2013, 中国环境科学出版社 *

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Application publication date: 20210409