铁基臭氧催化氧化技术降解电子面板高浓度含氮含硫有机废水研究

Degradation of High Concentration Nitrogen and Sulfur Organic Wastewater in TFT-LED by Iron-Based Ozone Catalytic Oxidation Technology

随着国内工业快速发展,含氮、含硫等高浓度TMAH、DMSO有机废水处理日渐重要。非均相臭氧催化氧化是一种有效的有机废水预处理方式,采用以氢氧化铁为基底的触媒进行臭氧催化氧化,对面板厂(TFT-LCD)废水进行预处理,并对处理过程中的工艺参数进行优化。结果表明,非均相臭氧催化氧化COD去除率约38~93%,有机氮去除率78%~96%,有效促进水中有机物分解以及有机氮氨化及硝化反应。相比传统活性污泥体系,以生物COD处理负荷F/M ~0.2 d?1、MLVSS 4000 mg/L进行估算,废水量6000 CMD(吨/日),能降低活性污泥池有效容积10,000~23,000 m3。以氮化物来看,以生物氨氮硝化负荷F/M ~0.01 d?1、MLVSS 4000 mg/L进行估算,废水量6000 CMD (吨/日),能降低活性污泥池有效容积9,800~20,000 m3,且能将有机氮同时氧化为氨氮与硝酸盐氮,氧化过程中控制氨氮浓度并将长链有机物氧化成短链易处理有机物。同时,处理含硫废水处理过程中不生成恶臭分子。对电子产业难处理高浓度有机废水的环保与经济问题有正面帮助。

With the rapid development of domestic industry, the treatment of high concentration of organic nitrogen and organic sulfur wastewater like TMAH, DMSO is increasingly important. Heterogeneous catalytic ozonation is an effective pretreatment method for organic wastewater. The catalyst based on ferric hydroxide was used for ozone catalytic oxidation. The wastewater from TFT-LCD was pretreated and the process parameters were optimized. The results showed that the removal rate of COD by catalytic ozonation was about 38% - 93%, and the organic nitrogen was 78% - 96%. Compared with the traditional activated sludge process, heterogeneous catalytic ozonation can reduce 10,000 - 23,000 m3 or 9,800 - 20,000 m3 effective volume of the activated sludge tank. The estimation was based on F/M: COD ~0.2 d?1, F/M: org-N ~0.01 d?1, MLVSS 4000 mg/L and 6000 CMD (tons/day). At the same time, no odorous molecules are generated during the treatment of sulfur-containing wastewater. Heterogeneous catalytic ozonation not only effectively promote the decomposition of organic compound and nitrification of organic nitrogen but simultaneously oxidize organic nitrogen to nitrate, ammonia and nitrogen.