Cleaning high-concentration wastewaters left after styrene and propylene oxide production

摘要

The goal hereof is to study the process of preparing high-concentration biologically toxic wastewaters for biological treatment.To attain this goal,the following was analyzed:(a)the composition of wastewaters from an operating enterprise;(b)the methods used to treat wastewaters of similar composition;(c)organic substances contained in wastewaters and how they could be removed by extraction.It is shown herein that the wastewater organics can be separated into another phase by reducing pH-altering acidification through introducing concentrated mineral acids into the wastewaters at room temperature and intensive mixing.In addition,the method of extraction was used for a more complete removal of organic substances isolated from the water phase.In this process the extractant in the amount of 5% out of the total wastewaters volume was used.The research quantified the biodegradation-enabling wastewater impurities.