Caffaro-Filho Roberto A, Morita Dione M, Wagner Roger, Durrant Lucia R
Food Sciences Department, Faculty of Food Engineering, State University of Campinas, Brazil.
J Hazard Mater. 2009 Apr 15;163(1):92-7. doi: 10.1016/j.jhazmat.2008.06.063. Epub 2008 Jun 26.
A broader characterization of industrial wastewaters, especially in respect to hazardous compounds and their potential toxicity, is often necessary in order to determine the best practical treatment (or pretreatment) technology available to reduce the discharge of harmful pollutants to the environment or publicly owned treatment works. Using a toxicity-directed approach, this paper sets the base for a rational treatability study of polyester resin manufacturing. Relevant physical and chemical characteristics were determined. Respirometry was used for toxicity reduction evaluation after physical and chemical effluent fractionation. Of all the procedures investigated, only air stripping was significantly effective in reducing wastewater toxicity. Air stripping in pH 7 reduced toxicity in 18.2%, while in pH 11 a toxicity reduction of 62.5% was observed. Results indicated that toxicants responsible for the most significant fraction of the effluent's instantaneous toxic effect to unadapted activated sludge were organic compounds poorly or not volatilized in acid conditions. These results led to useful directions for conducting treatability studies which will be grounded on actual effluent properties rather than empirical or based on the rare specific data on this kind of industrial wastewater.
为了确定可用的最佳实际处理（或预处理）技术，以减少向环境或公共污水处理厂排放有害污染物，通常需要对工业废水进行更广泛的特性描述，尤其是关于有害化合物及其潜在毒性的描述。本文采用毒性导向方法，为聚酯树脂制造的合理可处理性研究奠定了基础。测定了相关的物理和化学特性。在对物理和化学流出物进行分馏后，采用呼吸测定法评估毒性降低情况。在所有研究的程序中，只有空气吹脱在降低废水毒性方面具有显著效果。在pH值为7时进行空气吹脱，毒性降低了18.2%，而在pH值为11时，观察到毒性降低了62.5%。结果表明，对未适应活性污泥的流出物瞬时毒性影响最大的有毒物质是在酸性条件下挥发性差或不挥发的有机化合物。这些结果为开展可处理性研究提供了有用的方向，该研究将基于实际流出物特性，而不是基于经验或基于此类工业废水稀少的特定数据。
