Interdisciplinary Graduate School, Nanyang Technological University, Singapore 639798, Singapore; Nanyang Environment & Water Research Institute, Advanced Environmental Biotechnology Centre, Nanyang Technological University, Singapore 637141, Singapore.
Nanyang Environment & Water Research Institute, Advanced Environmental Biotechnology Centre, Nanyang Technological University, Singapore 637141, Singapore.
Bioresour Technol. 2017 Oct;241:161-170. doi: 10.1016/j.biortech.2017.05.098. Epub 2017 May 18.
This study examined the effects of a deficiency in trace metals (TMs) on the performance of a submerged anaerobic membrane bioreactor (SAMBR). When trace metals were excluded from the feed to the SAMBR, COD removal and methane yield reduced while VFAs in the effluent increased. A reduction of up to 37.48% in the total metal content in the reactor was observed, while the less bioavailable fractions increased up to 13.29%. Pulse addition of trace metals for 7 days at 5-times the daily metal loading was effective in improving the performance of the SAMBR by increasing the amount of trace metals in the bioavailable fractions from 2.12% to 11.92%, with up to 87.7% of added metals retained in the reactor within 24h. However, the second and third pulse at 5 and 10-times daily metal loading did not result in similar changes in metal speciation and might have inhibited the methanogens.
本研究考察了痕量金属（TMs）缺乏对浸没式厌氧膜生物反应器（SAMBR）性能的影响。当从 SAMBR 的进料中去除痕量金属时，COD 去除率和甲烷产率降低，而流出物中的 VFAs 增加。观察到反应器中总金属含量减少了高达 37.48%，而生物利用度较低的部分增加了高达 13.29%。在 7 天内以每天金属负荷的 5 倍脉冲添加痕量金属，通过将生物可利用部分中的痕量金属量从 2.12%增加到 11.92%，有效改善了 SAMBR 的性能，其中高达 87.7%的添加金属在 24 小时内保留在反应器中。然而，第二次和第三次以 5 倍和 10 倍日金属负荷的脉冲添加并未导致金属形态发生类似变化，并且可能抑制了产甲烷菌。
