Evaluating the impact of operational parameters on the formation of soluble microbial products (SMP) by activated sludge.
Evaluating the impact of operational parameters on the formation of soluble microbial products (SMP) by activated sludge.
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DOI：
10.1016/j.watres.2012.11.022
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发表时间：
2013-03
期刊：
影响因子：
12.8
通讯作者：
Wen‐Ming Xie;B. Ni;T. Seviour;Hanqing Yu
中科院分区：
文献类型：
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作者：
Wen‐Ming Xie;B. Ni;T. Seviour;Hanqing Yu
可溶性微生物产物(SMP)是污水生物处理出水中残留有机物的主要组成部分。工艺参数对特定细菌群生产SMP的影响目前尚不清楚。本工作采用实验和模拟相结合的方法，对不同底物浓度、不同溶解氧水平和不同温度下活性污泥产生SMP进行了研究。结果表明，在三个参数中，SMP的产量对底物浓度最为敏感。底物浓度提高3倍时，污泥总产量提高70.5%，其中异养细菌、氨氧化细菌和亚硝酸盐氧化细菌的产量分别提高61.2%、580.0%和410.0%。温度对SMP的影响不明显。温度从20℃降至10℃，总污泥减少17.2%，其中异养菌产污泥减少20.0%，AOB和NOB分别增加180.0%和140.0%。DO浓度对总SMP产量和异养SMP产量几乎没有影响，而对自养SMP产量有显著的正影响。在DO浓度从8.7 mg/L降至1.5 mg/L后，AOB和NOB的SMP产量分别下降了24.3%和47.8%，但DO对总SMP产量的净影响可以忽略不计。
Soluble microbial products (SMP) are the major component of the residual organic fraction in biological wastewater treatment effluent. The impact of process parameters on SMP production by specific groups of bacteria is currently unknown. In this work, SMP production by activated sludge at different substrate concentrations, dissolved oxygen (DO) levels and temperatures, was evaluated by experimental and modeling approaches. The results showed that among the three parameters, SMP production was most sensitive to substrate concentration. Total SMP production was increased 70.5% by a threefold increase in substrate concentration, with SMP produced from heterotrophs, ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB) increasing by 61.2%, 580.0% and 410.0%, respectively. The effect of temperature on SMP was less pronounced. Decreasing the temperature from 20 °C to 10 °C decreased total SMP by 17.2%, with SMP production from heterotrophs decreasing by 20.0%, and from the AOB and NOB increasing by 180.0% and 140.0%. DO concentration had nearly no effect on total and heterotrophic SMP production, while it did have a significant positive effect on autotrophic SMP production. SMP production from AOB and NOB decreased by 24.3% and 47.8%, respectively following a decrease in DO concentration from 8.7 to 1.5 mg/L. However, the net effect of DO on total SMP production was negligible.