Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, China.
College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China.
Sci Rep. 2018 May 15;8(1):7555. doi: 10.1038/s41598-018-25761-6.
A pilot scale reactor with an effective volume of 2.93 m was built in-situ and run in both batch and continuous modes to investigate the removal for organic pollutants in bio-treated dyeing and finishing wastewater by heterogeneous catalytic ozonation under neutral pH with waste iron shavings as a catalyst. Experimental results showed that both running modes were able to reduce the chemical oxygen demand (COD) from 132-148 mg/L to a level below the discharge criteria (<80 mg/L) within 15-30 mins under several conditions. Specifically, significantly organic removal was observed with COD, soluble COD (sCOD) and dissolved organic carbon (DOC) decreased from the initial 165, 93 and 76 mg/L to 54, 28 and 16 mg/L respectively, when treated by 10.2 g-O/min of ozone dosage at a hydraulic retention time of 30 mins under continuous mode. 80% proteins and 85% polysaccharides were removed with a decrease in their contribution to sCOD from 69% to 43%. Mineralization as well as conversion of high molecular organic compounds was observed through Gas Chromatography-Mass Spectrometer (GC-MS) & Liquid Chromatography-Mass Spectrometer (LC-MS) analysis, which led to a decrease of inhibitory effect from 29% to 25%, suggesting a reduction in the acute toxicity.
建立了一座有效体积为 2.93m 的中试规模反应器，在原位以间歇和连续两种模式运行，研究在中性 pH 条件下，利用废铁屑作为催化剂，通过非均相催化臭氧化法去除生物处理染色和整理废水中的有机污染物。实验结果表明，在几种条件下，两种运行模式均能在 15-30min 内将化学需氧量（COD）从 132-148mg/L 降低到排放标准以下（<80mg/L）。具体来说，当连续模式下水力停留时间为 30min 时，臭氧用量为 10.2g-O/min，COD、可溶性 COD（sCOD）和溶解有机碳（DOC）分别从初始的 165、93 和 76mg/L 显著降低到 54、28 和 16mg/L，观察到有机去除量显著增加，sCOD 中蛋白质和多糖的去除率分别为 80%和 85%，其对 sCOD 的贡献从 69%降低到 43%。通过气相色谱-质谱（GC-MS）和液相色谱-质谱（LC-MS）分析，观察到矿化以及高分子有机化合物的转化，这导致抑制作用从 29%降低到 25%，表明急性毒性降低。
