A pretreatment system and treatment method for high-concentration wastewater from chemical synthesis and pharmaceuticals

Abstract

The invention relates to a pretreatment system and a pretreatment method for high-concentration wastewater from chemical synthesis and pharmaceuticals. The pretreatment system includes a grid adjustment tank connected in sequence, an oil separation sedimentation tank, a coagulation tank, an iron-carbon micro-electrolysis tank, It is characterized in that the coagulant in the coagulation tank includes amphoteric acrylamide copolymer. The amphoteric acrylamide copolymer is acrylamide obtained by copolymerizing hydrophobic cationic modified acrylamide and fumaric acid. The pretreatment system of the present invention does not require high-cost and high-energy-consumption processes such as ozone oxidation or concentrated evaporation to treat high-concentration wastewater. The B / C value of the treated wastewater is significantly improved, and the biodegradability of the wastewater is significantly improved, which is convenient for further processing. biochemical treatment.

Description

technical field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a pretreatment system and a treatment method for high-concentration wastewater of chemical synthesis and pharmaceuticals. Background technique

[0002] The pharmaceutical industry is one of the ten key industries for the special rectification of the Water Pollution Prevention and Control Action Plan (referred to as "Water Ten Measures"). The production process of chemical synthesis drugs has many steps, long cycles, and many types of raw and auxiliary materials. The final product only accounts for the total amount of raw materials. A large amount of unreacted raw materials and solvents enter the wastewater. Chemical synthesis pharmaceutical wastewater has complex wastewater components, high COD content, and poor biodegradability. The wastewater contains cyanide, phenol, aromatic amines, and nitrogen. Heterocyclic and polycyclic aromatic hydrocarbons and other...

Examples

preparation example 1

[0033] Preparation Example 1 Use petroleum ether as the continuous phase, and use Tween 60: Span 40 = 1:1 as a composite emulsifier to prepare the oil phase. According to the mass ratio of acrylamide (AM): dimethylhexadecyl (2-methyl Acrylamidopropyl) ammonium bromide (AM16):fumaric acid (FA)=60:5:10 disperses the monomer in water, the total mass concentration of the monomer is controlled at 40wt%, and the aqueous phase is prepared.

[0034] Under stirring, under nitrogen, the water phase is slowly added to the oil phase, the volume ratio of the oil phase and the water phase is 1.7:1, the temperature is raised to 50 ° C, and then 0.7 wt% of the total monomer mass is added. According to the aqueous solution of the composite initiator of ammonium sulfate with a mass ratio of 1:2, heat preservation and react for 6h, cool to room temperature and discharge to obtain a solution of the copolymer, break the emulsion with ethanol, and wash with a solvent with acetone / ethanol volume rati...

preparation example 2

[0037] Other conditions and steps are the same as in Preparation Example 1, except that dimethyltetradecyl (2-methacrylamidopropyl) ammonium bromide (AM14) is used to replace dimethylhexadecyl (2-methyl Acrylamidopropyl) ammonium bromide (AM16).

preparation example 3

[0039] Other conditions and steps are the same as in Preparation Example 1, except that dimethyloctadecyl (2-methacrylamidopropyl) ammonium bromide (AM18) is used to replace dimethylhexadecyl (2-methyl Acrylamidopropyl) ammonium bromide (AM16).

technical field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a pretreatment system and a treatment method for high-concentration wastewater of chemical synthesis and pharmaceuticals. Background technique

[0002] The pharmaceutical industry is one of the ten key industries for the special rectification of the Water Pollution Prevention and Control Action Plan (referred to as "Water Ten Measures"). The production process of chemical synthesis drugs has many steps, long cycles, and many types of raw and auxiliary materials. The final product only accounts for the total amount of raw materials. A large amount of unreacted raw materials and solvents enter the wastewater. Chemical synthesis pharmaceutical wastewater has complex wastewater components, high COD content, and poor biodegradability. The wastewater contains cyanide, phenol, aromatic amines, and nitrogen. Heterocyclic and polycyclic aromatic hydrocarbons and other...

Examples

preparation example 1

[0033] Preparation Example 1 Use petroleum ether as the continuous phase, and use Tween 60: Span 40 = 1:1 as a composite emulsifier to prepare the oil phase. According to the mass ratio of acrylamide (AM): dimethylhexadecyl (2-methyl Acrylamidopropyl) ammonium bromide (AM16):fumaric acid (FA)=60:5:10 disperses the monomer in water, the total mass concentration of the monomer is controlled at 40wt%, and the aqueous phase is prepared.

[0034] Under stirring, under nitrogen, the water phase is slowly added to the oil phase, the volume ratio of the oil phase and the water phase is 1.7:1, the temperature is raised to 50 ° C, and then 0.7 wt% of the total monomer mass is added. According to the aqueous solution of the composite initiator of ammonium sulfate with a mass ratio of 1:2, heat preservation and react for 6h, cool to room temperature and discharge to obtain a solution of the copolymer, break the emulsion with ethanol, and wash with a solvent with acetone / ethanol volume rati...

preparation example 2

[0037] Other conditions and steps are the same as in Preparation Example 1, except that dimethyltetradecyl (2-methacrylamidopropyl) ammonium bromide (AM14) is used to replace dimethylhexadecyl (2-methyl Acrylamidopropyl) ammonium bromide (AM16).

preparation example 3

[0039] Other conditions and steps are the same as in Preparation Example 1, except that dimethyloctadecyl (2-methacrylamidopropyl) ammonium bromide (AM18) is used to replace dimethylhexadecyl (2-methyl Acrylamidopropyl) ammonium bromide (AM16).

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