CN110803798A - Method for treating formalin waste liquid for specimen preservation - Google Patents
Method for treating formalin waste liquid for specimen preservation Download PDFInfo
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- CN110803798A CN110803798A CN201911097391.2A CN201911097391A CN110803798A CN 110803798 A CN110803798 A CN 110803798A CN 201911097391 A CN201911097391 A CN 201911097391A CN 110803798 A CN110803798 A CN 110803798A
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
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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
- C02F2103/003—Wastewater from hospitals, laboratories and the like, heavily contaminated by pathogenic microorganisms
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses a method for treating formalin waste liquid for specimen preservation, which relates to the field of environmental protection and comprises the following steps: s100, collecting formalin waste liquid, carrying out coarse filtration and discharging primary waste liquid; s200, filtering the primary waste liquid through a membrane to discharge secondary waste liquid; s300, acidifying and oxidizing the second-stage waste liquid to discharge a third-stage waste liquid; s400, carrying out alkalization treatment on the third-stage waste liquid and discharging when the pH value of the waste liquid is detected to be 7-8. Compared with the prior art, the method has the beneficial effects that: (1) the method can reduce the chroma and turbidity of the waste liquid while removing formaldehyde, and the treated waste liquid can be directly discharged after reaching the standard; (2) in part of the prior art methods, the final product also needs to be incinerated and buried, and the method of the invention can reduce the final treatment work and reduce the energy consumption.
Description
Technical Field
The invention relates to pollution-free emission treatment of formalin waste liquid, in particular to a method for treating the formalin waste liquid for specimen preservation.
Background
Formalin, which is an aqueous solution of formaldehyde, generally contains 37-40% of formaldehyde gas, and is easily polymerized when placed in a low-temperature environment for a long time or contacted with air for a long time, and white paraformaldehyde or trioxymethylene precipitates, so that 8-15% of methanol is often added to prevent the polymerization of formaldehyde. Formaldehyde is a colorless, highly volatile, strongly pungent gas with a relative density of 1.067 (1 in air) and a liquid density of 0.815g/cm3(-20 deg.C), melting point of-92 deg.C, boiling point of-19.5 deg.C, and can be used for stimulating conjunctiva and respiratory mucosa of eye and also can be used for treating cancer. In 2017, 10 and 27, the list of carcinogens published by the international agency for research on cancer of the world health organization, formaldehyde is on a list of carcinogens.
Formaldehyde is often used as a specimen fixing solution in an anatomical laboratory in hospitals and research institutions, the use amount of formaldehyde (formalin) is large, and the output of waste liquid is also large. Substances contained in the formalin waste liquid are mainly formaldehyde, and in addition, paraformaldehyde, methanol, formic acid, mould, specimen residue and the like, and if the substances are directly discharged, the environment is polluted. In 2019, 7 and 23, formaldehyde was listed in the list of toxic and harmful water pollutants (first batch).
Therefore, those skilled in the art are devoted to develop a method for treating the formalin waste liquid for specimen preservation, which can treat the formalin waste liquid to ensure that the formalin waste liquid reaches the standard and then is discharged, thereby reducing pollution.
Disclosure of Invention
In view of some defects of the prior art in the field, the invention aims to develop a method for treating the formalin waste liquid for specimen preservation, which can treat the formalin waste liquid to ensure that the formalin waste liquid reaches the standard and then is discharged, thereby reducing pollution.
In order to achieve the aim, the invention discloses a method for treating formalin waste liquid for specimen preservation, which comprises the following steps:
s100, collecting formalin waste liquid, carrying out coarse filtration and discharging primary waste liquid;
s200, filtering the primary waste liquid through a membrane to discharge secondary waste liquid;
s300, acidifying and oxidizing the second-stage waste liquid to discharge a third-stage waste liquid;
s400, carrying out alkalization treatment on the third-stage waste liquid and discharging when the pH value of the waste liquid is detected to be 7-8.
Compared with the prior art, the method has the beneficial effects that:
(1) the method can reduce the chroma and turbidity of the waste liquid while removing formaldehyde, and the treated waste liquid can be directly discharged after reaching the standard;
(2) in part of the prior art methods, the final product needs to be incinerated and buried, and the method can reduce the final treatment work and reduce the energy consumption;
(3) the method of the invention applies the nano-bubble technology, has the functions of deodorization and sterilization, and can improve the separation efficiency and resist corrosion by using a ceramic filter membrane or a silicon carbide filter membrane.
Drawings
FIG. 1 is a flow chart of a method for treating a formalin waste liquid for specimen preservation according to a preferred embodiment of the present invention.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
As shown in fig. 1, a flowchart of a method for processing formalin waste liquid for specimen preservation according to a preferred embodiment of the present invention includes the following steps:
s100, collecting formalin waste liquid, carrying out coarse filtration and discharging primary waste liquid;
s200, filtering the primary waste liquid through a membrane to discharge secondary waste liquid;
s300, acidifying and oxidizing the second-stage waste liquid to discharge a third-stage waste liquid;
s400, carrying out alkalization treatment on the third-stage waste liquid and discharging when the pH value of the waste liquid is detected to be 7-8.
The terms "first stage", "second stage" and "third stage" are used merely to distinguish the waste liquid discharged after the treatment of the three steps of step S100, step S200 and step S300, and do not limit the scope of the present invention.
On one hand, the method can reduce the chroma and turbidity of the waste liquid while removing formaldehyde, and the treated waste liquid can be directly discharged after reaching the standard;
on the other hand, part of the prior art methods also need to burn and bury the final product, and the method of the invention can reduce the final treatment work and reduce the energy consumption.
In a preferred embodiment, step S100 includes collecting and concentrating the formalin waste liquid in an impermeable container, pumping the formalin waste liquid through a filter screen to remove solid precipitates in the formalin waste liquid, and discharging the formalin waste liquid as a primary waste liquid.
In a preferred embodiment, step S200 comprises passing the first stage waste stream through a < 0.5 μm filter membrane to reduce COD and BOD therein and discharging the second stage waste stream.
In a preferred embodiment, the filtering membrane in step S200 is one of a silicon carbide filtering membrane or a ceramic filtering membrane.
In a preferred embodiment, step S300 includes:
s301, using H to the secondary waste liquid2SO4Acidifying to pH 3-4;
s302, adding a Fenton reagent into the waste liquid treated in the S301, and then adding hydrogen peroxide into the waste liquid;
and S303, injecting nano bubbles into the bottom of the waste liquid treated in the step S302, reacting for 2-3 hours at normal temperature, and discharging a third-stage waste liquid.
In a preferred embodiment, step S400 includes: and adding an alkaline solution into the third-stage waste liquid, and discharging when the pH value of the waste liquid is detected to be 7-8.
In a preferred embodiment, the alkaline solution in step S400 includes one of a sodium hydroxide solution or a calcium hydroxide solution.
In a preferred embodiment, the ratio of the waste liquid to the Fenton reagent and the hydrogen peroxide in step S302 is that 140-.
In a preferred embodiment, the reaction equation in step S302 is:
Fe2++H2O2→Fe3++OH-+·OH
Fe3++H2O2→Fe2++.OOH+H+
·OOH→O2-+H+
O2-+H2O2→O2+·OH+OH-
·OH+HCHO→CO2+H2O
the following 3 specific examples are used to describe the implementation of the method for treating formalin waste liquid for specimen preservation according to the present invention:
example 1
Coarse filtration of formalin waste liquid:
collecting formalin waste liquid, concentrating the formalin waste liquid in a leakage-proof container, pumping the formalin waste liquid by a pump, removing solid precipitates and sample residues in the formalin waste liquid through a filter screen, and discharging primary formalin waste liquid;
membrane filtration:
filtering the first-stage waste liquid by a ceramic filtering membrane with the diameter of 0.2 mu m, reducing COD and BOD in the waste liquid and discharging the second-stage waste liquid;
acidifying and oxidizing the second-stage waste liquid:
after the concentration of the formalin waste liquid is determined to be less than 10%, a dilute sulfuric acid solution is added into the secondary waste liquid, the secondary waste liquid is acidified, the pH value of the waste liquid is measured until the pH value of the waste liquid reaches 3-4, a Fenton reagent is added into the waste liquid, hydrogen peroxide is added into the waste liquid, nano bubbles are injected into the bottom of the waste liquid, the proportion of the waste liquid to the Fenton reagent to the hydrogen peroxide is that 140g of the Fenton reagent and 180ml of hydrogen peroxide with the concentration of 30% are added into every 500ml of the formalin waste liquid, and the tertiary waste liquid is discharged after the formalin waste liquid reacts for 2 hours at normal temperature.
Alkalization treatment:
and adding an alkaline solution, including but not limited to a sodium hydroxide solution and a calcium hydroxide solution, into the third-stage waste liquid, detecting the pH value of the waste liquid, and discharging when the pH value of the waste liquid is 7-8.
Example 2
Coarse filtration of formalin waste liquid:
collecting formalin waste liquid, concentrating the formalin waste liquid in a leakage-proof container, pumping the formalin waste liquid by a pump, removing solid precipitates and sample residues in the formalin waste liquid through a filter screen, and discharging primary formalin waste liquid;
membrane filtration:
filtering the first-stage waste liquid by a ceramic filtering membrane with the diameter of 0.25 mu m, reducing COD and BOD in the waste liquid and discharging the second-stage waste liquid;
acidifying and oxidizing the second-stage waste liquid:
after the concentration of the formalin waste liquid is determined to be less than 10%, a dilute sulfuric acid solution is added into the secondary waste liquid, the secondary waste liquid is acidified, the pH value of the waste liquid is measured until the pH value of the waste liquid reaches 3-4, a Fenton reagent is added into the waste liquid, hydrogen peroxide is added into the waste liquid, nano bubbles are injected into the bottom of the waste liquid, 150g of the Fenton reagent and 200ml of hydrogen peroxide with the concentration of 30% are added into every 550ml of the formalin waste liquid, and the tertiary waste liquid is discharged after the formalin waste liquid reacts for 2 hours at normal temperature.
Alkalization treatment:
and adding an alkaline solution, including but not limited to a sodium hydroxide solution and a calcium hydroxide solution, into the third-stage waste liquid, detecting the pH value of the waste liquid, and discharging when the pH value of the waste liquid is 7-8.
Example 3
Coarse filtration of formalin waste liquid:
collecting formalin waste liquid, concentrating the formalin waste liquid in a leakage-proof container, pumping the formalin waste liquid by a pump, removing solid precipitates and sample residues in the formalin waste liquid through a filter screen, and discharging primary formalin waste liquid;
membrane filtration:
filtering the first-stage waste liquid by a silicon carbide filtering membrane with the diameter of 0.3 mu m, reducing COD and BOD in the waste liquid and discharging the second-stage waste liquid;
acidifying and oxidizing the second-stage waste liquid:
after the concentration of the formalin waste liquid is determined to be less than 10%, a dilute sulfuric acid solution is added into the secondary waste liquid, the secondary waste liquid is acidified and the pH value of the waste liquid is measured until the pH value of the waste liquid reaches 3-4, a Fenton reagent is added into the waste liquid, hydrogen peroxide is added into the waste liquid, nano bubbles are injected into the bottom of the waste liquid, 160g of the Fenton reagent and 220ml of hydrogen peroxide with the concentration of 30% are added into every 600ml of the formalin waste liquid, and the tertiary waste liquid is discharged after the formalin waste liquid reacts for 2 hours at normal temperature.
Alkalization treatment:
and adding an alkaline solution, including but not limited to a sodium hydroxide solution and a calcium hydroxide solution, into the third-stage waste liquid, detecting the pH value of the waste liquid, and discharging when the pH value of the waste liquid is 7-8.
The above examples are laboratory experiments, when large area formalin waste liquid is treated industrially by the method of the present invention, other steps are the same, except that when the second stage waste liquid is acidified and oxidized, for example, the second stage waste liquid is 1 ton, when the pH value is acidified to about 3 by dilute sulfuric acid, 350kg fenton reagent is added, 400L of 30% hydrogen peroxide solution is slowly added, the reaction is carried out for 2 hours at normal temperature, and then alkaline solution is further added until the pH value of the waste liquid reaches 7-8, and then the waste liquid can be discharged.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (9)
1. A method of treating a formalin waste liquid for specimen preservation, the method comprising the steps of:
s100, collecting formalin waste liquid, carrying out coarse filtration and discharging primary waste liquid;
s200, filtering the primary waste liquid through a filtering membrane to discharge secondary waste liquid;
s300, acidifying and oxidizing the second-stage waste liquid to discharge a third-stage waste liquid;
s400, carrying out alkalization treatment on the third-stage waste liquid and discharging when the pH value of the waste liquid is detected to be 7-8.
2. The method of claim 1, wherein step S100 comprises collecting and concentrating the formalin waste liquid in an impermeable container, pumping the formalin waste liquid through a filter screen to remove solid precipitate in the formalin waste liquid, and discharging the formalin waste liquid as a first-stage waste liquid.
3. The method as claimed in claim 1, wherein the filtering membrane in step S200 is one of a silicon carbide filtering membrane or a ceramic filtering membrane.
4. The method of claim 1 wherein step S200 comprises passing the first stage waste stream through a < 0.5 μm filter membrane to reduce COD and BOD therein and discharging the second stage waste stream.
5. The method of claim 1, wherein step S300 comprises:
s301, using H to the secondary waste liquid2SO4Acidifying to pH 3-4;
s302, adding a Fenton reagent into the waste liquid treated in the step S301, and then adding hydrogen peroxide into the waste liquid;
and S303, injecting nano bubbles into the bottom of the waste liquid treated in the step S302, reacting for 2-3 hours at normal temperature, and discharging a third-stage waste liquid.
6. The method of claim 1, wherein step S400 comprises: and adding an alkaline solution into the third-stage waste liquid, and discharging when the pH value of the waste liquid is detected to be 7-8.
7. The method of claim 1, wherein the alkaline solution of step S400 comprises one of a sodium hydroxide solution or a calcium hydroxide solution.
8. The method as claimed in claim 5, wherein the ratio of the waste liquid to the Fenton reagent and the hydrogen peroxide in step S302 is that 140-160g of the Fenton reagent and 180-220ml of 30% hydrogen peroxide are added to each 500-600ml of the formalin waste liquid.
9. The method of claim 4, wherein the reaction equation in step S302 is:
Fe2++H2O2→Fe3++OH-+·OH
Fe3++H2O2→Fe2++·OOH+H+·OOH→O2-+H+
O2-+H2O2→O2+·OH+OH-·OH+HCHO→CO2+H2O
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103755065A (en) * | 2013-12-31 | 2014-04-30 | 浙江大学 | Method for reducing COD (Chemical Oxygen Demand) of tebuconazole industrial wastewater |
| CN104261546A (en) * | 2014-09-25 | 2015-01-07 | 西安华陆环保设备有限公司 | Treatment method of phenolic wastewater |
| CN205151984U (en) * | 2015-11-17 | 2016-04-13 | 张家港市华亿科教设备有限公司 | Formalin liquid water disposal system |
| CN107304093A (en) * | 2016-04-25 | 2017-10-31 | 江苏德邦工程有限公司 | Containing formaldehyde, the integrated deep treatment method of methanol waste water and processing unit |
| JP2019084493A (en) * | 2017-11-07 | 2019-06-06 | 前田建設工業株式会社 | Decomposition purification method of hardly decomposable organic compound |
-
2019
- 2019-11-11 CN CN201911097391.2A patent/CN110803798A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103755065A (en) * | 2013-12-31 | 2014-04-30 | 浙江大学 | Method for reducing COD (Chemical Oxygen Demand) of tebuconazole industrial wastewater |
| CN104261546A (en) * | 2014-09-25 | 2015-01-07 | 西安华陆环保设备有限公司 | Treatment method of phenolic wastewater |
| CN205151984U (en) * | 2015-11-17 | 2016-04-13 | 张家港市华亿科教设备有限公司 | Formalin liquid water disposal system |
| CN107304093A (en) * | 2016-04-25 | 2017-10-31 | 江苏德邦工程有限公司 | Containing formaldehyde, the integrated deep treatment method of methanol waste water and processing unit |
| JP2019084493A (en) * | 2017-11-07 | 2019-06-06 | 前田建設工業株式会社 | Decomposition purification method of hardly decomposable organic compound |
Non-Patent Citations (2)
| Title |
|---|
| 吴超飞等: "催化氧化法处理含甲醛毒性有机废水的工程试验", 《环境工程》 * |
| 段云霞等: "《城市黑臭水体治理实用技术及案例分析》", 31 March 2018, 天津大学出版社 * |
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Effective date of registration: 20200512 Address after: 315000 Building A4-2, No. 5, Lane 189, Canghai Road, Ningbo High-tech Zone, Zhejiang Province Applicant after: NINGBO WESDON POWDER PHARMA COATINGS Co.,Ltd. Applicant after: ZHANGJIAGANG DEREN SCIENTIFIC EQUIPMENT CO.,LTD. Address before: Room 501-99, building 1, Yigao Plaza, Yuecheng District, Shaoxing City, Zhejiang Province Applicant before: Shaoxing vison Environmental Technology Co.,Ltd. Applicant before: ZHANGJIAGANG DEREN SCIENTIFIC EQUIPMENT Co.,Ltd. |
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Application publication date: 20200218 |