Stergar V, Zagorc-Koncan J, Zgajnar-Gotvanj A
University of Ljubljana, Faculty of Chemistry and Chemical Technology, Askerceva 5, POB 537, SI-1000 Ljubljana, Slovenia.
Water Sci Technol. 2003;48(8):97-102.
This research concentrates on the development of an integrated approach to evaluate the possibility of treating very concentrated (COD = 15-20 g/l) and toxic wastewater (nitro-organic effluent) from the petrochemical industry in UASB reactors. A newly developed method utilising a modified Micro-Oxymax respirometer was used to (1) evaluate the inhibitory effects of varying concentrations of nitro-organic effluent on anaerobic granular sludge and (2) to make the proposal of operational parameters for the start up of the continuous process. Subsequently, the continuous tests were undertaken using laboratory scale upflow anaerobic sludge bed reactors to test gradual adaptation of anaerobic biomass to nitro-organic effluent. Practical application of the experimental results of the laboratory-scale continuous tests was evaluated by running the UASB pilot plant. Acceptable COD removal efficiencies were obtained when nitro-organic effluent was diluted with a readily biodegradable substrate up to 80 vol % of nitro-organic effluent in the inlet. The COD removal was 90% and the methane production rate was 4.5 l/d. Wastewater was detoxified and no acute toxicity of the treated wastewater to the anaerobic biomass was detected. This research indicates that anaerobic digestion of the undiluted nitro-organic effluent was not feasible. However, it is possible to blend the nitro-organic effluent with another effluent stream and co-treat these effluents.
本研究致力于开发一种综合方法，以评估在UASB反应器中处理来自石化行业的高浓度（化学需氧量 = 15 - 20 g/l）有毒废水（硝基有机废水）的可能性。一种新开发的利用改良型微量氧最大值呼吸仪的方法被用于：（1）评估不同浓度的硝基有机废水对厌氧颗粒污泥的抑制作用；（2）提出连续工艺启动的运行参数建议。随后，使用实验室规模的上流式厌氧污泥床反应器进行连续试验，以测试厌氧生物质对硝基有机废水的逐步适应性。通过运行UASB中试装置评估了实验室规模连续试验结果的实际应用。当硝基有机废水用易生物降解的底物稀释，使其在进水口占硝基有机废水的体积比高达80%时，获得了可接受的化学需氧量去除效率。化学需氧量去除率为90%，甲烷产率为4.5 l/d。废水得到了解毒，未检测到处理后的废水对厌氧生物质有急性毒性。本研究表明，未经稀释的硝基有机废水的厌氧消化是不可行的。然而，将硝基有机废水与另一种废水流混合并共同处理这些废水是可行的。
