In India, high strength spent wash (SW) produced from alcohol distilleries is preferably treated by biomethanation process. However, biomethanated SW (BMSW) still contains intensified dark brown colour, high chemical oxygen demand (COD) and poor biodegradability which requires further treatment before disposal. Wet oxidation (WO) is considered an effective treatment for high strength non-biodegradable wastewaters (COD > 10 g/L). Hence, the present study explored WO of BMSW (pH = 5.7, COD = 65.5 g/L, and total organic carbon (TOC) = 23.5 g/L) in a high pressure batch reactor (0.7 L capacity) at temperatures ranging from 160-220°C and oxygen pressure of 1.1 MPa. At 220°C temperature, TOC, COD and color removals of 39%, 59% and 90%, respectively, were observed after 3 h of reaction period. Meanwhile, biodegradability index (BI) was enhanced from 0.27 to 0.81. Carbon balance calculations showed that the oxidation reaction contribution in TOC removal was enhanced with increase in temperature (64 – 92% of total carbon removal). Fourier transform infrared (FTIR) analysis suggested the precipitation of carbonyl group and nitrogen containing compounds. During the reaction, volatile fatty acids (oxalic acid, malonic acid and acetic acid) formation was also confirmed in the treated wastewater.

中文翻译：

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使用湿式氧化处理法去除酒厂生物甲烷化废液的颜色并提高其生物降解性

在印度，酒精蒸馏厂生产的高强度废洗液（SW）最好通过生物甲烷化工艺进行处理。但是，生物甲烷化的SW（BMSW）仍含有深褐色，化学需氧量（COD）高，生物降解性差，需要在处置前进行进一步处理。湿式氧化（WO）被认为是高强度不可生物降解废水（COD> 10 g / L）的有效处理方法。因此，本研究在160℃的高压间歇式反应器（容量0.7 L）中探索了BMSW的WO（pH = 5.7，COD = 65.5 g / L，总有机碳（TOC）= 23.5 g / L）。 -220°C，氧气压力为1.1 MPa。在3小时的反应时间后，在220°C的温度下，TOC，COD和脱色率分别达到39％，59％和90％。同时，生物降解指数（BI）从0提高。27至0.81。碳平衡计算表明，氧化反应对TOC去除的贡献随着温度的升高而增强（占总碳去除量的64 – 92％）。傅立叶红外光谱（FTIR）分析表明羰基和含氮化合物沉淀。在反应过程中，在处理后的废水中还证实形成了挥发性脂肪酸（草酸，丙二酸和乙酸）。