Ramakrishnan Anushuya, Gupta Sudhir Kumar
Centre for Environmental Science and Engineering, Indian Institute of Technology, Bombay, Powai, Mumbai 400 076, India.
Bioresour Technol. 2008 Jun;99(9):3745-53. doi: 10.1016/j.biortech.2007.07.014. Epub 2007 Aug 21.
This study describes the feasibility of anaerobic treatment of synthetic coal wastewater using four identical 13.5L (effective volume) bench scale hybrid up flow anaerobic sludge blanket (HUASB) reactors (R1, R2, R3 and R4) under mesophilic (27+/-5 degrees C) conditions. Synthetic coal wastewater with an average chemical oxygen demand (COD) of 2240 mg/L and phenolics concentration of 752 mg/L was used as substrate. Effluent recirculation was employed at four different effluent to feed recirculation ratios (R/F) of 0.5, 1.0, 1.5 and 2.0 for 100 days to study the effect of recirculation on the performance of the reactors. Phenolics and COD removal was found to improve with increase in effluent recirculation. An effluent to feed recycle ratio of 1.0 resulted in maximum removal of phenolics and COD. Phenolics and COD removal improved from 88% and 92% to 95% each, respectively. The concentration of volatile fatty acids in the effluent was lower than the influent when effluent to feed recirculation was employed. Effect of shock loading on the reactors revealed that phenolics shock load up to 2.5 times increase in the normal input phenolics concentration in the form of continuous shock load for 4days did not affect the reactors performance irreversibly.
本研究描述了在中温（27±5℃）条件下，使用四个相同的13.5升（有效体积）实验室规模的复合上流式厌氧污泥床（HUASB）反应器（R1、R2、R3和R4）对合成煤废水进行厌氧处理的可行性。以平均化学需氧量（COD）为2240毫克/升、酚类物质浓度为752毫克/升的合成煤废水作为底物。采用四种不同的出水与进水循环比（R/F），即0.5、1.0、1.5和2.0，进行100天的出水循环，以研究循环对反应器性能的影响。发现随着出水循环的增加，酚类物质和COD的去除率提高。出水与进水循环比为1.0时，酚类物质和COD的去除率最高。酚类物质和COD的去除率分别从88%和92%提高到了95%。采用出水与进水循环时，出水挥发性脂肪酸的浓度低于进水。对反应器的冲击负荷影响表明，以连续冲击负荷形式出现的酚类冲击负荷，在正常进水酚类浓度的基础上增加2.5倍，持续4天，并未对反应器性能造成不可逆的影响。
