Department of Engineering Science, University of Oxford, Parks Road, Oxford OX13PJ, UK.
Bioresour Technol. 2011 Oct;102(19):8783-9. doi: 10.1016/j.biortech.2011.07.031. Epub 2011 Jul 21.
Disposal of operationally exhausted metalworking fluids (MWFs) is enormously challenging. In this study the feasibility of employing a sequential Fenton-biological oxidation for the treatment of recalcitrant components of MWF wastewater was investigated. A statistical experimental design was employed to address Fenton reagent (H₂O₂, Fe²⁺) dose optimisation which ensured minimal concentrations of the reagents, thus making the treatment environmentally less toxic to subsequent biological steps and economically viable. This was achieved by employing a five-level-two-variable central composite experimental design. The results demonstrated that Fenton pre-treatment of the MWF effluent greatly improved biodegradability index (BOD₅)/COD increased from 0.160 to 0.538) with a synchronous lowering in the toxicity of the wastewater, making the recalcitrant component more amenable to subsequent biological treatment. An overall decrease of 92% and 86% in chemical oxygen demand (COD) and total organic carbon (TOC), respectively, was achieved by the two-step treatment method developed.
处理已使用的金属加工液（MWF）极具挑战性。在本研究中，采用序批式芬顿-生物氧化法处理难处理的 MWF 废水的可行性进行了研究。采用统计实验设计来解决芬顿试剂（H₂O₂，Fe²⁺）剂量优化问题，确保试剂的最小浓度，从而使处理对后续生物步骤的环境毒性和经济可行性降低。采用五水平二变量中心组合实验设计实现了这一点。结果表明，MWF 废水的芬顿预处理极大地提高了生物降解指数（BOD₅/COD 从 0.160 增加到 0.538），同时降低了废水的毒性，使难处理的成分更适合后续的生物处理。所开发的两步处理方法分别使化学需氧量（COD）和总有机碳（TOC）总体降低了 92%和 86%。
