Method for treating production wastewater of methyl methacrylate produced by isobutene oxidation method

Abstract

The invention provides a method for treating wastewater of methyl methacrylate produced by an isobutylene oxidation method. The method comprises the following steps: adjusting the pH value of MMA production wastewater to be 10-10.5, stirring and reacting for a certain time, strengthening the self-polymerization reaction of aldehyde substances, and mixing and homogenizing the reacted wastewater with other production wastewater. The homogenized wastewater is subjected to super-efficient shallow air floatation to remove most of aldehyde self-polymers with inhibition effect on growth of microorganisms, and the inhibition effect on biochemical treatment is reduced. Nutrient salt is added into the gas floating effluent to enter an improved UASB anaerobic reactor for anaerobic biochemical treatment, the trace element nutrient salt helps to improve the volumetric load and COD removal efficiency of the anaerobic reaction, and the wastewater subjected to the anaerobic biochemical treatment is treated by an A / O aerobic biochemical treatment and an O3 / H2O2 oxidation method, so that the standard discharge is finally achieved. The method provided by the invention has the advantages of strong pertinence, high treatment efficiency, stable and reliable water yielding and the like.

Description

technical field [0001] The invention relates to a method for treating wastewater produced by an isobutylene oxidation method to produce methyl methacrylate (MMA), and belongs to the technical field of wastewater treatment. Background technique [0002] Methyl methacrylate (MMA) is an important organic chemical raw material and chemical product. At present, the mainstream production process routes of MMA in the world mainly include acetone cyanohydrin method, isobutylene oxidation method, ethylene carbonylation method, etc. The acetone cyanohydrin method The raw material hydrocyanic acid is highly toxic, sulfuric acid is used in the process, and it takes a lot of investment to treat the waste acid, which has high requirements for safety and environmental protection; the production cost of ethylene carbonylation is high, and it needs to be integrated with ethylene production to produce It is competitive; the isobutene oxidation method belongs to a kind of green chemistry. Comp...

AI Technical Summary

Problems solved by technology

[0005] The production of methyl methacrylate (MMA) by isobutylene oxidation belongs to the fine chemical industry. The production process is simple chemical synthesis, with short reaction steps and single raw materials; the waste water produced by it has a single composition and lacks nitrogen, phosphorus and other inorganic substances needed for microbial growth. Salt, trace elements and other growth factors; without additional elements needed for biological growth, the biochemical treatment system of wastewater is prone to sludge fragmentation, disintegration, swelling, loss, etc., and finally the biochemical system of wastewater is difficult to operate efficiently and stably

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