阅读说明：本技术 一种餐饮业含油废水用复合破乳剂的制备方法 (Preparation method of composite demulsifier for oily wastewater in catering industry ) 是由 李鸿昊 李建强 于 2021-08-23 设计创作，主要内容包括：一种餐饮业含油废水用复合破乳剂的制备方法涉及污水处理技术领域,该破乳剂包括以下组分及占总量的比例,总量按100％计：四乙烯五胺：15-20％；聚甲基烷基二烯丙基氯化铵15-20％；硬脂酸酰胺丙基二甲基烷基季铵盐10-15％；乙二醇4-6％；余量为水；包括以下步骤：1)将乙二醇和水混合,加入聚甲基烷基二烯丙基氯化铵搅拌均匀；2)接着加入硬脂酸酰胺丙基二甲基烷基季铵盐搅拌均匀；3)最后加入四乙烯五胺搅拌均匀；4)静置至少24小时得到破乳剂产品。本发明利用聚甲基烷基二烯丙基氯化铵、四乙烯五胺和硬脂酸酰胺丙基二甲基烷基季铵盐配合后独特的絮凝作用,用于餐饮业含油废水的处理,不但成本低而且效果理想。(A preparation method of a composite demulsifier for oily wastewater in catering industry relates to the technical field of sewage treatment, and the demulsifier comprises the following components in percentage by total weight, wherein the total weight is calculated according to 100 percent: tetraethylenepentamine: 15 to 20 percent; 15-20% of poly (methyl alkyl diallyl ammonium chloride); 10-15% of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt; 4-6% of ethylene glycol; the balance of water; the method comprises the following steps: 1) mixing ethylene glycol and water, adding polymethyl alkyl diallyl ammonium chloride, and uniformly stirring; 2) then adding stearic acid amide propyl dimethyl alkyl quaternary ammonium salt and stirring uniformly; 3) finally adding tetraethylenepentamine and stirring uniformly; 4) standing for at least 24 hours to obtain the demulsifier product. The invention utilizes the unique flocculation effect of the poly-methyl alkyl diallyl ammonium chloride, the tetraethylene pentamine and the stearic acid amide propyl dimethyl alkyl quaternary ammonium salt after being matched, is used for treating oily wastewater in catering industry, and has low cost and ideal effect.)

1. A preparation method of a composite demulsifier for oily wastewater in catering industry is characterized by comprising the following steps: the demulsifier comprises the following components in percentage by total weight, wherein the total weight is calculated according to 100 percent:

tetraethylenepentamine: 15 to 20 percent;

15-20% of poly (methyl alkyl diallyl ammonium chloride);

10-15% of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt;

4-6% of ethylene glycol;

the balance of water;

the method comprises the following steps:

1) mixing ethylene glycol and water, adding polymethyl alkyl diallyl ammonium chloride, and uniformly stirring;

2) then adding stearic acid amide propyl dimethyl alkyl quaternary ammonium salt and stirring uniformly;

3) finally adding tetraethylenepentamine and stirring uniformly;

4) standing for at least 24 hours to obtain the demulsifier product.

2. The preparation method of the composite demulsifier for oily wastewater in catering industry according to claim 1, which is characterized by comprising the following steps: in the step 1), the ethylene glycol is mixed with water after the temperature of the ethylene glycol is kept between 30 and 40 ℃.

3. The preparation method of the composite demulsifier for oily wastewater in catering industry according to claim 1, which is characterized by comprising the following steps: adding the poly-methyl-alkyl-diallyl-ammonium chloride in the step 1), and heating to 45-55 ℃.

4. The preparation method of the composite demulsifier for oily wastewater in catering industry according to claim 1, which is characterized by comprising the following steps: the temperature of the mixed solution is kept between 45 ℃ and 55 ℃ in the steps 2) and 3).

5. The preparation method of the composite demulsifier for oily wastewater in catering industry according to claim 1, which is characterized by comprising the following steps: and 4) standing the mixed solution in the step 4) and naturally cooling.

6. The preparation method of the composite demulsifier for oily wastewater in catering industry according to claim 1, which is characterized by comprising the following steps: the demulsifier comprises the following components in percentage by total weight, wherein the total weight is calculated according to 100 percent:

tetraethylenepentamine: 17 percent;

17% of poly (methyl alkyl diallyl ammonium chloride);

12% of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt;

4% of ethylene glycol;

the balance being water.

7. The preparation method of the composite demulsifier for oily wastewater in catering industry according to claim 1, which is characterized by comprising the following steps: in step 1), the ethylene glycol is mixed with water after the temperature is kept at 30 ℃.

Adding the poly-methyl-alkyl-diallyl-ammonium chloride in the step 1), and heating to 55 ℃.

The mixture was kept at 55 ℃ in steps 2) and 3).

Technical Field

The invention relates to the technical field of sewage treatment, in particular to a demulsifier for treating oily wastewater in the catering industry.

Background

The catering industry is an important component of the third industry, and is the earliest and highest-marketability industry in the reform and development of China. With the improvement of the living standard of people in China and the rapid development of domestic catering service industry, the pollution of oily waste water generated by various catering enterprises to the environment is more and more serious. The oily wastewater in the catering industry refers to the oily wastewater formed by mixing a large amount of grease with domestic sewage in kitchens in the processes of washing tableware and an oil pan, pouring residual oil and residual soup and cold roasting after edible oil or food is heated and fried at high temperature in the cooking process and is added into food. The treatment of the oily wastewater can reduce the pollution to the environment, but how to improve the treatment effect is a difficult problem in the prior art.

Disclosure of Invention

The invention provides a preparation method of a composite demulsifier for oily wastewater in catering industry, and through experiments, the demulsifier can effectively treat oily wastewater in catering industry, realize flocculation of grease and impurities in wastewater, preliminarily realize treatment of oily wastewater, and lay a foundation for subsequent wastewater purification.

In order to achieve the purpose, the invention adopts the technical scheme that:

a preparation method of a composite demulsifier for oily wastewater in catering industry comprises the following steps: the demulsifier comprises the following components in percentage by total weight, wherein the total weight is calculated according to 100 percent:

tetraethylenepentamine: 15 to 20 percent;

15-20% of poly (methyl alkyl diallyl ammonium chloride);

10-15% of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt;

4-6% of ethylene glycol;

the balance of water;

the method comprises the following steps:

1) mixing ethylene glycol and water, adding polymethyl alkyl diallyl ammonium chloride, and uniformly stirring;

2) then adding stearic acid amide propyl dimethyl alkyl quaternary ammonium salt and stirring uniformly;

3) finally adding tetraethylenepentamine and stirring uniformly;

4) standing for at least 24 hours to obtain the demulsifier product.

Further, in the step 1), the ethylene glycol is mixed with water after the temperature is kept at 30-40 ℃.

Further, the temperature is raised to 45-55 ℃ after the polymethyl alkyl diallyl ammonium chloride is added in the step 1).

Further, the temperature of the mixed solution is kept between 45 ℃ and 55 ℃ in the steps 2) and 3).

Further, standing the mixed solution in the step 4) and naturally cooling.

Further, the demulsifier comprises the following components in percentage by total weight, wherein the total weight is 100 percent:

tetraethylenepentamine: 17 percent;

17% of poly (methyl alkyl diallyl ammonium chloride);

12% of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt;

4% of ethylene glycol;

the balance being water.

Further, in step 1), the ethylene glycol is mixed with water after being kept at a temperature of 30 ℃.

Adding the poly-methyl-alkyl-diallyl-ammonium chloride in the step 1), and heating to 55 ℃.

The mixture was kept at 55 ℃ in steps 2) and 3).

The invention has the following effects:

the demulsifier is prepared from ethylene glycol, poly (methyl alkyl diallyl ammonium chloride), stearic acid amidopropyl dimethyl alkyl quaternary ammonium salt and tetraethylenepentamine under a certain temperature and stirring condition, and is used for treating oily wastewater in catering industry by utilizing unique flocculation effect of the poly (methyl alkyl diallyl ammonium chloride), the tetraethylenepentamine and the stearic acid amidopropyl dimethyl alkyl quaternary ammonium salt, so that the cost is low, the effect is ideal, the dehydration rate can reach 95.5%, and the COD removal rate can reach 93.1%.

Detailed Description

The following provides a detailed description of embodiments of the present invention by way of examples.

Example 1: adding 4g of ethylene glycol into a beaker, keeping the temperature at 30 ℃, then adding 56g of water, stirring and mixing uniformly, then adding 15g of polymethyl alkyl diallyl ammonium chloride, stirring for 1 hour to mix uniformly, heating to 45 ℃, then adding 10g of stearic acid amidopropyl dimethyl alkyl quaternary ammonium salt, keeping the temperature at 45 ℃, stirring for 3 hours to mix uniformly, finally adding 15g of tetraethylenepentamine, keeping the temperature at 45 ℃, stirring uniformly, and standing for 24 hours to naturally cool.

Example 2: adding 4g of ethylene glycol into a beaker, keeping the temperature at 40 ℃, then adding 53g of water, stirring and mixing uniformly, then adding 16g of polymethyl alkyl diallyl ammonium chloride, stirring for 1 hour to mix uniformly, heating to 55 ℃, then adding 11g of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt, keeping the temperature at 55 ℃, stirring for 3 hours to mix uniformly, finally adding 16g of tetraethylenepentamine, keeping the temperature at 55 ℃, stirring uniformly, and standing for 24 hours to naturally cool.

Example 3: adding 4g of ethylene glycol into a beaker, keeping the temperature at 30 ℃, then adding 50g of water, stirring and mixing uniformly, then adding 17g of polymethyl alkyl diallyl ammonium chloride, stirring for 1 hour to mix uniformly, heating to 55 ℃, then adding 12g of stearic acid amidopropyl dimethyl alkyl quaternary ammonium salt, keeping the temperature at 55 ℃, stirring for 3 hours to mix uniformly, finally adding 17g of tetraethylenepentamine, keeping the temperature at 55 ℃, stirring uniformly, and standing for 24 hours to naturally cool.

Example 4: adding 4g of ethylene glycol into a beaker, keeping the temperature at 40 ℃, then adding 47g of water, stirring and mixing uniformly, then adding 18g of polymethyl alkyl diallyl ammonium chloride, stirring for 1 hour to mix uniformly, heating to 45 ℃, then adding 13g of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt, keeping the temperature at 45 ℃, stirring for 3 hours to mix uniformly, finally adding 18g of tetraethylenepentamine, keeping the temperature at 45 ℃, stirring uniformly, and standing for 24 hours to naturally cool.

Example 5: adding 4g of ethylene glycol into a beaker, keeping the temperature at 35 ℃, then adding 44g of water, stirring and mixing uniformly, then adding 19g of polymethyl alkyl diallyl ammonium chloride, stirring for 1 hour to mix uniformly, heating to 50 ℃, then adding 14g of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt, keeping the temperature at 50 ℃, stirring for 3 hours to mix uniformly, finally adding 19g of tetraethylenepentamine, keeping the temperature at 50 ℃, stirring uniformly, and standing for 24 hours to naturally cool.

Example 6: adding 4g of ethylene glycol into a beaker, keeping the temperature at 35 ℃, then adding 41g of water, stirring and mixing uniformly, then adding 20g of polymethyl alkyl diallyl ammonium chloride, stirring for 1 hour to mix uniformly, heating to 55 ℃, then adding 15g of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt, keeping the temperature at 55 ℃, stirring for 3 hours to mix uniformly, finally adding 20g of tetraethylenepentamine, keeping the temperature at 55 ℃, stirring uniformly, and standing for 24 hours to naturally cool.

The demulsification performance of the composite demulsifier of each embodiment is tested:

the performance evaluation of the demulsifier is carried out by referring to a related experimental method in the general technical conditions of crude oil demulsifiers (SY/T5280-2018) of the oil and gas industry standard, and the dehydration rate is taken as an evaluation index. The dosage of the demulsifier is 100mg/L, and the result is as follows:

serial number	Dehydration Rate (%)	COD removal Rate (%)
			Example 1	94.9	90.8
Example 2	95.5	91.4
			Example 3	95.5	93.1
Example 4	94.1	90.8
			Example 5	95.2	91.7
Example 6	94.3	93.1

The demulsifier is prepared from ethylene glycol, polymethyl allyl ammonium chloride, stearic acid amide propyl dimethyl alkyl quaternary ammonium salt and tetraethylenepentamine under a certain temperature and stirring condition, and is used for treating oily wastewater in catering industry by utilizing unique flocculation after the polymethyl allyl ammonium chloride, the tetraethylenepentamine and the stearic acid amide propyl dimethyl alkyl quaternary ammonium salt are matched.