在中温(35±1)℃厌氧条件下,以葡萄糖为基质,采用间歇试验法,通过测定甲烷累积产量,研究了某污水处理厂进水中检出的2种甲基萘类有机化合物(1-甲基萘,2-甲基萘)的厌氧生物毒性,得到了相对产气活性随甲基萘浓度变化的趋势,并利用相...在中温(35±1)℃厌氧条件下,以葡萄糖为基质,采用间歇试验法,通过测定甲烷累积产量,研究了某污水处理厂进水中检出的2种甲基萘类有机化合物(1-甲基萘,2-甲基萘)的厌氧生物毒性,得到了相对产气活性随甲基萘浓度变化的趋势,并利用相对活性确定了反应时间为24、48、72、96和120 h 2种甲基萘产甲烷的50%相对抑制浓度,2种甲基萘在厌氧处理系统中最高可允许浓度分别为171.31、79.80 mg/L。结果表明,在厌氧环境中,2-甲基萘对厌氧污泥的毒性大于1-甲基萘。展开更多
A series of batch experiments were conducted in 125 mL serum bottles to assess the toxicity of different concentrations of ammonia nitrogen to the specific methanogenic activity of anaerobic granular sludge from upflo...A series of batch experiments were conducted in 125 mL serum bottles to assess the toxicity of different concentrations of ammonia nitrogen to the specific methanogenic activity of anaerobic granular sludge from upflow anaerobic sludge bed（UASB） and expanded granular sludge bed（EGSB） reactors. The effects of pH value and temperature on toxicity of ammonia nitrogen to anaerobes were investigated. The results show that the specific methanogenic activity of anaerobic granular sludge suffers inhibition from ammonia nitrogen, the concentrations of ammonia nitrogen that produce 50 % inhibition of specific methanogenic activity for sludge from UASB and EGSB reactor are 2.35 and 2.75 g/L, respectively. Hydrogen utilizing methanogens suffers less inhibition from ammonia mtrogen than that of acetate utilizing methanogens. Hydrogen-producing acetogens that utilize propionate and butyrate as substrates suffer serious inhibition from ammonia nitrogen. The toxicity of ammonia nitrogen to anaerobic granular sludge enhances when pH value and temperature increase. Anaerobic granular sludge can bear higher concentrations of ammonia nitrogen after being acclimated by ammonia nitrogen for 7 d.展开更多
文摘在中温(35±1)℃厌氧条件下,以葡萄糖为基质,采用间歇试验法,通过测定甲烷累积产量,研究了某污水处理厂进水中检出的2种甲基萘类有机化合物(1-甲基萘,2-甲基萘)的厌氧生物毒性,得到了相对产气活性随甲基萘浓度变化的趋势,并利用相对活性确定了反应时间为24、48、72、96和120 h 2种甲基萘产甲烷的50%相对抑制浓度,2种甲基萘在厌氧处理系统中最高可允许浓度分别为171.31、79.80 mg/L。结果表明,在厌氧环境中,2-甲基萘对厌氧污泥的毒性大于1-甲基萘。
文摘A series of batch experiments were conducted in 125 mL serum bottles to assess the toxicity of different concentrations of ammonia nitrogen to the specific methanogenic activity of anaerobic granular sludge from upflow anaerobic sludge bed（UASB） and expanded granular sludge bed（EGSB） reactors. The effects of pH value and temperature on toxicity of ammonia nitrogen to anaerobes were investigated. The results show that the specific methanogenic activity of anaerobic granular sludge suffers inhibition from ammonia nitrogen, the concentrations of ammonia nitrogen that produce 50 % inhibition of specific methanogenic activity for sludge from UASB and EGSB reactor are 2.35 and 2.75 g/L, respectively. Hydrogen utilizing methanogens suffers less inhibition from ammonia mtrogen than that of acetate utilizing methanogens. Hydrogen-producing acetogens that utilize propionate and butyrate as substrates suffer serious inhibition from ammonia nitrogen. The toxicity of ammonia nitrogen to anaerobic granular sludge enhances when pH value and temperature increase. Anaerobic granular sludge can bear higher concentrations of ammonia nitrogen after being acclimated by ammonia nitrogen for 7 d.
