Pretreatment Of Wastewater From Acrylonitrile-butadiene-styrene (ABS) Resin Manufacturing By Internal Microelectrolysis

With Chinese quick expansion of household electrical appliances and automobile industry, demand of acrylonitrile - butadiene - styrene (i.e. ABS) resin in the country showes the trend of rapid growth, which also causes widespread concern of wastewater treatment from ABS. ABS resin wastewater is one of refractory toxic waste, which contained nitrile compounds, benzene, styrene-butadiene latex and characterized of poor biodegradability. Currently, ABS resin wastewater from domestic manufactory had only been pretreated with the methods of coagulation and flotation. It could only remove the suspended solids, but not transform toxic waste water into the biodegradable pollutants and was not propitious for the subsequent biological treatment. Therefore, it is significant to search a cost-effective wastewater treatment process for ABS resin wastewater.Aiming at the problems in ABS resin wastewater treatment process, this paper presented a treatment of micro-electrolysis and test was made on ABS resin wastewater of Jilin Petro-chemical company, which studyed the decomposition and transformation of toxic refractory pollutants, the improvement of biodegradability. This paper analyzed the influence of the parameters of the pH value, residence time, temperature, etc. on micro-electrolysis technology and aims at the effluent to do a comprehensive analysis of the system.The results showed that the micro-electrolysis could decompose and transform the toxic refractory organic pollutants and increase the BOD5/ CODCr ratio from 0.32 to 0.60, which increased the biodegradability of ABS resin wastewater significantly. As the influent pH is 4, HRT 4h, and the ratio of iron to carbon 1:1, the removal rates of COD could reach about 70%. However, the systems didn't have the capacity of nitrogen removal, only decomposed and transformed the pollutants organic nitrogen of waste water, that was to say the micro-electrolysis could translate organic nitrogen compounds in waste water into ammonia, the conversion rate up to 60%.Effluent flowed from the micro-electrolysis to the biological fluidized bed(i.e. BAF) to be dealed with directly or secondly. The study found that the treatment efficiency was good. The COD removal efficiency of wastewater can be reduced by 90% and the TN can reach 58%. This fully proved that pretreatment of wastewater from ABS resin manufacturing by internal microelectrolysis was feasible.