Key Laboratory of Development and Application of Rural Renewable Energy, Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, China.
Sichuan Academy of Environmental Policy and Planning, Chengdu 610041, China.
J Environ Sci (China). 2022 Jan;111:84-92. doi: 10.1016/j.jes.2021.03.007. Epub 2021 Mar 19.
The recycling reverse osmosis (RO) membrane concentrate of some high-ammonia nitrogen (NH-N) organic wastewater to the biological unit could cause potassium ion (K) accumulation, thereby affecting the removal of NH-N by activated sludge. Thus, the effects of high K stress on activated sludge nitrification performance was studied. The results showed that the high K stress promoted the floc sludge to produce more extracellular polymers (EPS), which accelerated the sludge sedimentation and enriched the biomass in sequential batch reactors (SBRs). The ammonia oxidation process and nitrite (NO-N) oxidation process were further analyzed in the nitrification process. High K stress enriched ammonia oxidizing bacteria (AOB), which ensured the efficient ammonia oxidation process in SBRs, and ensured the removal rate of NH-N was maintained above 93%. However, high K stress (15g/L KCl) inhibited the activity of NO-N oxidizing bacteria (NOB) and reduced the abundance of NOB, thus leading to the accumulation of NO-N, and finally worsened the nitrification performance of activated sludge. In short, the performance of activated sludge will not be inhibited when the K in the wastewater does not exceed 5.23 g/L. The results could provide a reference for the optimization of the biological performance in treating high-NH-N organic wastewater with activated sludge coupled RO membrane treatment process.
将某些高氨氮（NH-N）有机废水的反渗透（RO）膜浓缩物回用到生物处理单元可能会导致钾离子（K）积累，从而影响活性污泥对 NH-N 的去除。因此，研究了高 K 胁迫对活性污泥硝化性能的影响。结果表明，高 K 胁迫促进了絮体污泥产生更多的胞外聚合物（EPS），加速了污泥沉降，并在序批式反应器（SBR）中富集了生物量。在硝化过程中进一步分析了氨氧化过程和亚硝酸盐（NO-N）氧化过程。高 K 胁迫富集了氨氧化细菌（AOB），保证了 SBR 中高效的氨氧化过程，保证了 NH-N 的去除率保持在 93%以上。然而，高 K 胁迫（15g/L KCl）抑制了亚硝酸盐氧化细菌（NOB）的活性，降低了 NOB 的丰度，导致 NO-N 的积累，最终恶化了活性污泥的硝化性能。总之，当废水中的 K 不超过 5.23g/L 时，活性污泥的性能不会受到抑制。该结果可为优化活性污泥与反渗透膜处理工艺耦合处理高 NH-N 有机废水的生物性能提供参考。
