Study On Acrylic Wastewater Treatment And Prearation Of Scale Inhibitor

At present, burning is the main method among many treatments of high concentration and strong acid organic wastewater produced from acrylic acid production. However, this method not only consumes a large amount of fuel oil and costs high; it can also generate secondary pollution.The treatment effects of iron carbon micro electrolysis, Fenton oxidation, ozone oxidation and the A/O process on acrylic wastewater are examined first. The results show that CODcr removal rate of acrylic wastewater treated with iron carbon micro electrolysis, Fenton oxidation and ozone oxidation were31.0%,32.6%and59.0%, respectively, and because of acrylic wastewater’s biological toxicity, activated sludge wasn’t domesticated in A/O treatment processing. When using these methods, found that the wastewater becomes very viscous, which could be due to the free radicals generated in the redox process leading the acrylic acid to polymerize, forming poly-acrylic acid-a kind of antiscalant. Then a new acrylic wastewater treatment method is produced. With acrylic acid wastewater as the raw material, poly-acrylic acid scale inhibitors were synthesized by adding initiator to polymerize the acrylic acid under appropriate conditions. So the acrylic acid wastewater got reused.Several factors affecting the production inhibition rate were explored, including initiator dosage, reaction temperature and time. The result shows that when the ammonium persulfate dosage of1.8g/L, sodium bisulfite dosage of0.82g/L, reaction time of100minutes and temperature of86℃, the polymerization effect of acrylic wastewater can reach a high point, with the inhibition rate being up to91.32%. Other factors were also studied such as acetic acid, formaldehyde and maleic acid. The results find that acetic acid and formaldehyde have no effect on the polymerization of acrylic acid, but maleic acid can copolymerize with acrylic acid to increase the inhibition rate.