东华大学环境学院大三印染废水中水回用设计性实验论文..docx

《环工综合实验（2）》铁碳微电解—混凝对印染废水二沉池出水的中水回用研究论文盛波铁碳微电解—混凝对印染废水二沉池出水的中水回用研究 (东华大学环境科学与工程学院，环境工程，环工1301，上海，201620)摘 要： 针对印染废水二沉池出水水质难降解且难以达标的现状，采用铁碳微电解混凝工艺进行处理研究，为印染废水的中水回用提供了可行的基础。通过实验，确定铁碳微电解的最佳工艺条件为Fe的投量为46g/L、m(C) : m( Fe)为1∶6、水力停留时间(HRT)为1.5h。最佳混凝条件为: Al2(SO4)3投量为1ml/L、混凝沉淀时间为30min。实验结果表明，在上述最优工艺条件下对该废水进行深度处理，对COD的去除率能达到50%以上，出水COD低至38.46mg/L。关键词： 铁碳微电解 混凝 印染废水 二沉池出水 深度处理Study on the Reuse of Water in Two Settling Tank Effluent of Printing and Dyeing Wastewater by Iron Carbon Micro- electrolysis and CoagulationSheng Bo Zhou Xin Yang Huan Zhou Weizhu Zhang Yuanfan Xie Tengfei Zhu Qian(College of Environmental Science and Engineering, Donghua University, Environmental Engineering, Class 1301, Shanghai, 201620)Abstract: Aiming at the present situation that the effluent quality of the printing and dyeing wastewater is difficult to be degraded and difficult to reach the standard, the treatment of the iron carbon micro electrolysis coagulation process is adopted, which provides a feasible basis for the reuse of the wastewater in the printing and dyeing wastewater. Through experiments, the optimal process conditions for the determination of iron carbon micro electrolysis were 46g/L, m (C): m (Fe), (Fe), 1: 6, hydraulic retention time (HRT) of 1.5h. The best coagulation conditions were as follows: Al2 (SO4) 3 dosage was 1ml/L, coagulation sedimentation time was 30min. The experimental results show that the COD removal rate can reach more than 50%, and the effluent COD is as low as 38.46mg/L in the above optimal process conditions.Key words: iron-carbon micro-electrolysis; coagulation; printing and dyeing wastewater; two sedimentation tank water; depth treatment印染废水是我国工业废水的重要组成部分之一。据不完全统计，2010年我国纺织工业废水排放量工业废水排放量第三位，占全国工业废水排放量的11.5%［1］。近年来，我国对印染废水的排放标准逐渐提高，2012年我国正式颁布新标准《纺织染整工业水污染物排放标准》(GB4287-2012)。其中对需要采取特别保护措施的地区规定: COD的限值为60mg/L。目前，通过一般的二级生化处理，COD等指标难以达到新标准，这意味着以印染废水为主的污水处理厂都将面临提标改造，深度处理势在必行，本实验以COD为主要研究对象。铁碳微电解工艺常常用于废水的预处理，目前该工艺通常需要调节废水pH至3左右［2］，通过提高废水的可生化性，从而达到强化二级生化处理的目的。当前，