阅读说明：本技术 一种高浓度医药中间体废水的预处理方法 (Pretreatment method of high-concentration medical intermediate wastewater ) 是由 姜琦 王卓 张樱 陈雪 于 2019-11-22 设计创作，主要内容包括：本发明公开了一种高浓度医药中间体废水的预处理方法,该方法包括将所述高浓度医药中间体废水用一种萃取剂进行萃取处理,得到萃取相和萃余相,其中,所述萃取剂含有甲基异丁基甲酮,所述高浓度医药中间体废水COD含量不低于5000mg·L<Sup>-1</Sup>。采用本发明提供的方法能够有效地去除所述高浓度医药中间体废水中大部分有机物质。(The invention discloses a pretreatment method of high-concentration medical intermediate wastewater, which comprises the step of extracting the high-concentration medical intermediate wastewater by using an extracting agent to obtain an extract phase and a raffinate phase, wherein the extracting agent contains methyl isobutyl ketone, and the COD content of the high-concentration medical intermediate wastewater is not lower than 5000 mg.L ‑1 . By adopting the method provided by the invention, most organic substances in the high-concentration medical intermediate wastewater can be effectively removed.)

1. A pretreatment method of high-concentration medical intermediate wastewater is characterized by comprising the following steps:

controlling the temperature of the high-concentration medical intermediate wastewater to be 10-40 ℃, and adjusting the pH value of the high-concentration medical intermediate wastewater to be less than 9; then mixing the extracting agent and the high-concentration medical intermediate wastewater according to the volume ratio of 1:3-6 for 10-30 minutes, and standing for 30-60 minutes to obtain an extract phase and a raffinate phase; the raffinate phase is subjected to the extraction process for at least 2 times.

2. The method for pretreating high-concentration medical intermediate wastewater according to claim 1, wherein the method comprises the following steps: the temperature of the high-concentration medical intermediate wastewater is controlled to be 20-30 ℃, and the pH value is adjusted to be 5-8.

3. The method for pretreating high-concentration medical intermediate wastewater according to claim 1, wherein the method comprises the following steps: the extractant is 4-methyl-2-pentanone.

4. The method for pretreating high-concentration medical intermediate wastewater according to claim 1, wherein the method comprises the following steps: the COD of the high-concentration medical intermediate wastewater is 5000- ^-1And the high-concentration medical intermediate wastewater contains organic pollutants.

5. The method for pretreating high-concentration medical intermediate wastewater according to claim 4, wherein the method comprises the following steps: the organic pollutants comprise one or more of heterocyclic compounds, aromatic compounds, alcohols, benzene and toluene.

6. The method for pretreating high-concentration medical intermediate wastewater according to claim 1, wherein the method comprises the following steps: the extracting agent is mixed with high-concentration medical intermediate wastewater according to the volume ratio of 1: 3-4.

7. The method for pretreating high-concentration medical intermediate wastewater according to claim 1, wherein the method comprises the following steps: the extraction phase comprises an extracting agent and organic matters extracted from the high-concentration medical intermediate wastewater, the extraction phase is rectified to separate the extracting agent and the organic matters, wherein the extracting agent is recycled, and the extracted organic wastes are incinerated.

8. The method for pretreating high-concentration medical intermediate wastewater according to claim 1, wherein the method comprises the following steps: the raffinate phase mainly comprises wastewater and a trace amount of extractant, the raffinate phase is rectified and separated from the extractant, the extractant is recycled, and the wastewater enters a biochemical treatment process after being cooled.

Technical Field

The invention relates to the technical field of wastewater treatment, in particular to a pretreatment method of high-concentration medical intermediate wastewater.

Background

4-methyl-2-pentanone, also known as methyl isobutyl ketone, is a colorless, pleasant-smelling liquid. The property is stable. Is slightly soluble in water and is mutually soluble in most organic solvents. The vapor forms an explosive mixture with air. Has strong local irritation and toxicity. Commonly used as solvent (for dissolving tetracycline, pyrethrin and dichlorodiphenyl trichloroethane and dewaxing oil product, etc.), inorganic salt separating agentMineral dressing agent, adhesive, rubber glue, masking varnish, organic synthetic raw material and the like. Used as a developing solvent for PMMA in electron beam lithography. Boiling point of 118 deg.C, density of 0.80g cm relative to water ^-3And the properties are stable. The method is not found to be used for extraction research or industrial application of high-concentration medical intermediate wastewater.

The medical intermediate wastewater usually contains various organic compounds, such as various heterocyclic compounds, aromatic compounds, alcohols, benzene, toluene and other organic solvents, COD in the wastewater usually reaches tens of thousands of milligrams per liter, and meanwhile, the wastewater has the characteristics of high salinity, complex components, poor biodegradability, high toxicity and the like, and is difficult to carry out biochemical treatment directly. When high-concentration medical intermediate wastewater is treated, pretreatment is usually carried out by a physical or chemical method to remove main toxic components in the wastewater and reduce COD to below 5000 mg.L < -1 > so as to meet the requirement of biochemical treatment. At present, common pretreatment methods comprise a coagulation method, an air floatation method, an oxidation method and the like, the treatment effect is poor, the treatment effect is influenced by toxic components, the acceptable water amount of a biochemical system is small, and the fluctuation of the effluent quality is large.

Disclosure of Invention

Based on the defects of the prior art, the technical problem solved by the invention is to provide a novel method for pretreating high-concentration medical intermediate wastewater aiming at the defect of poor pretreatment effect of the conventional physical and chemical process when wastewater is pretreated. The method can effectively reduce the content of organic matters in the high-concentration medical intermediate wastewater.

In order to solve the technical problem, the invention provides a pretreatment method of high-concentration medical intermediate wastewater, which comprises the following steps:

controlling the temperature of the high-concentration medical intermediate wastewater to be 10-40 ℃, and adjusting the pH value of the high-concentration medical intermediate wastewater to be less than 9; then mixing the extracting agent and the high-concentration medical intermediate wastewater according to the volume ratio of 1:3-6 for 10-30 minutes, and standing for 30-60 minutes to obtain an extract phase and a raffinate phase; the raffinate phase is subjected to the extraction process for at least 2 times.

Preferably, the method for pretreating high-concentration pharmaceutical intermediate wastewater provided by the invention further comprises part or all of the following technical characteristics:

as an improvement of the technical scheme, the temperature of the high-concentration medical intermediate wastewater is controlled to be 20-30 ℃, and the pH value is adjusted to be 5-8.

As an improvement of the technical scheme, the extracting agent is 4-methyl-2-pentanone

As an improvement of the technical proposal, the COD of the high-concentration medical intermediate wastewater is 5000-150000 mg.L ^-1And the high-concentration medical intermediate wastewater contains organic pollutants. (the method for treating the high-concentration medical intermediate wastewater provided by the invention is suitable for treating all COD (chemical oxygen demand) not less than 5000 mg.L ^-1The high concentration medical intermediate wastewater COD is preferably 5000- ^-1。)

As an improvement of the above technical solution, the organic pollutant comprises one or more of heterocyclic compounds, aromatic compounds, alcohols, benzene and toluene.

As an improvement of the technical scheme, the extracting agent is mixed with the high-concentration medical intermediate wastewater according to the volume ratio of 1: 3-4.

According to the invention, the high-concentration medical intermediate wastewater is uniformly mixed with an extracting agent under the extraction condition and then is subjected to standing and layering. The mixing time is based on uniformly mixing the high-concentration medical intermediate wastewater with the extracting agent, the standing time is based on sufficiently separating the water phase from the oil phase, the mixing time can be generally 10-30 minutes, and the standing time can be generally 30-60 minutes.

According to the present invention, the amount of the extractant to be used is appropriately selected depending on the amount of the high-concentration pharmaceutical intermediate wastewater to be treated, and generally, the volume ratio of the high-concentration pharmaceutical intermediate wastewater to one of the extractants may be 3 to 6:1, preferably 3 to 4: 1. Furthermore, the temperature of the extraction may be 10 to 40 ℃, preferably 20 to 30 ℃.

According to the present invention, the pH of the high concentration pharmaceutical intermediate wastewater contacted with the extractant is preferably less than 9, more preferably 5 to 8, which enables more significant reduction of the COD of the wastewater.

As an improvement of the technical scheme, the extraction phase comprises an extracting agent and organic matters extracted from high-concentration medical intermediate wastewater, the extraction phase is rectified and separated from the high-concentration medical intermediate wastewater, wherein the extracting agent is recycled, and the extracted organic wastes are incinerated.

As an improvement of the technical scheme, the raffinate phase mainly comprises wastewater and a trace amount of extractant, the raffinate phase is rectified and separated from the waste water, the extractant is recycled, and the wastewater enters a biochemical treatment process after being cooled.

Compared with the prior art, the technical scheme of the invention has the following beneficial effects:

1. the method has obvious treatment effect on the high-concentration medical intermediate wastewater, can effectively and quickly remove most organic molecules in the wastewater, and obviously improves the biochemical performance of the wastewater;

2. compared with the traditional chemical coagulating sedimentation or advanced oxidation method, the method has no sludge sedimentation, thereby avoiding the generation of solid hazardous waste.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the contents of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following detailed description is given in conjunction with the preferred embodiments.

Detailed Description

Other aspects, features and advantages of the present invention will become apparent from the following detailed description, which, when taken in conjunction with the drawings, illustrate by way of example the principles of the invention.

In the following examples and comparative examples, the high-concentration pharmaceutical intermediate wastewater is the production wastewater of a pharmaceutical intermediate enterprise, and the content detection of the COD of the high-concentration pharmaceutical intermediate wastewater adopts the dichromate method of the national environmental protection standard (HJ 828-. The rectification operation is well known to those skilled in the art and will not be described in further detail in the examples.