A process for treating wastewater from acrolein production

Abstract

The invention discloses a treatment process for acrolein production wastewater, which is characterized in that: the combination of improved Fenton deep oxidation and activated sludge method is adopted, and the control parameters of the improved Fenton deep oxidation include influent pH of 3.0 to 4.0, flocculation pH The value is the pH after the natural reaction, which is 2.5 to 3.5. After the flocculation is completed, the pH of the wastewater treated by the activated sludge method is adjusted to 6.5 to 7.5. The invention adopts the improved Fenton reagent method to eliminate toxic and harmful pollutants, thereby meeting the conditions of the activated sludge method, and the whole process occupies a small area, and the one-time investment is small, and the treatment cost is low.

Description

technical field [0001] The invention relates to a process for treating industrial waste water, in particular to a process for treating waste water from acrolein production. Background technique [0002] Propylene, air, and steam (water) are metered into the mixer according to the proportion of process requirements for the production of acrolein, and then enter the oxidation reactor after preheating. The catalytic oxidation reaction is carried out at 300-400 ° C, and then enter the acid washing tower after cooling. After washing the acrylic acid in the reaction gas with water, it enters the absorption tower, and absorbs the acrolein generated by the reaction with low-temperature cooling water, and the excess air and carbon oxides are emptied from the top of the absorption tower; The fraction at 52-53°C is the finished acrolein. The wastewater containing acrolein and acrylic acid discharged from the distillation is the acrolein production wastewater. [0003] There are three...

AI Technical Summary

Problems solved by technology

Due to the complex composition of acrolein wastewater, strong acidity, and high organic matter content (COD in the range of 10,000mg / L to 40,000mg / L), it is difficult to treat

[0004] Although the activated sludge method is the most cost-effective and most economical common process, it has two fatal defects in the treatment of acrolein wastewater: one is that the wastewater contains a large amount of toxic and harmful pollutants to microorganisms, which makes the microorganisms unable to survive; Second, it is unacceptable to have such a high concentration of organic pollutants, and a large amount of water is required to dilute it to an appropriate concentration, resulting in a very large area occupied by the structure

The main organic components of acrolein wastewater are low boiling substances, and the concentration pretreatment is not easy to carry out, and the operation is very difficult, so the cost is expensive

[0006] Wet oxidation method: It is theoretically feasible and practical, but for acrolein wastewater with a water volume of 600t / d, the one-time investment is too large

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