水解酸化-接触氧化-MBR工艺处理月饼加工废水

Food Processing Wastewater Treatment by a Combined Process of Hydrolytic Acidification,Biological Contact Oxidation and MBR

采用水解酸化-两段生物接触氧化-MBR工艺处理含有高SS、高COD的月饼加工废水,设计处理能力为100 m3/d。连续90 d的运行结果表明,在进水水质波动较大的情况下,对COD、氨氮和SS的去除率分别达到99%、98%和99%,出水水质达到了《城市污水再生利用城市杂用水水质》(GB/T 18920—2002)的城市绿化标准。各工艺段污水荧光图谱分析结果显示,水解酸化、两段生物接触氧化能显著降低芳香蛋白类物质、可见区类富里酸和类色氨酸物质的荧光强度,仅存较难处理的类腐殖酸物质的特征荧光峰。工程实践表明,该处理系统运行稳定,操作简单,具有良好的经济效益和环境效益。

The mooncake processing wastewater containing high SS and COD was treated by hydrolytic acidification, two-stage biological contact oxidation and MBR process with a treatment capacity of 100 m^3/d. After continuous operation for 90 days, the results showed that the removal rates of COD, ammonia nitrogen and SS still reached 99%, 98% and 99%, respectively, under great variation of influent quality. The effluent quality met the standard for urban greening in The Reuse of Urban Water Recycling—— Water Quality Standard for Urban Miscellaneous Water Consttmption （ GB/T 18920 - 2002 ）. Fluorescence spectra analysis of each process section indicated that the fluorescence intensities of aromatic protein, ful- vic acid-like and tryptophan-like in visible spectrum were obviously reduced through the process of hydrolytic acidification and two-stage biological contact oxidation, and most of the organic matters except remaining refractory humic acid components in the effluent were carbonized by MBR. The engineering practice showed that this treatment system was stable, easy to operate and had great economic and environ- mental benefits.