State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China.
State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China.
Chemosphere. 2020 Sep;255:127010. doi: 10.1016/j.chemosphere.2020.127010. Epub 2020 May 8.
The present work demonstrated the invention of synergistically strengthen of chemical and biological removal of phosphorus (P) in biological wastewater treatment, which was achieved by exposure the bioreactors to different levels of La-based-adsorbents. We fabricated a high-performance LaOCO micro-adsorbent (H-LaOCO) and added it into sequencing batch reactors. When activated sludge was exposed to 40 mg/L H-LaOCO for 40 d, effluent total phosphorus (TP) concentration significantly decreased to approximately 0.18 mg/L, with the steady removal efficiency of 96.4%, which is superior to the biological phosphorus removal (BPR). The effect of H-LaOCO dosages on P removal in biological wastewater treatment was also detailedly investigated. The H-LaOCO adsorbent could not only capture P by chemical bonding itself, but also increased protein (PN) contents of extracellular polymeric substances (EPS) and changed the functional group of EPS to chemically adsorb P. Additionally, the results of 16s rDNA molecular analysis revealed that the species richness and microbial diversity varied with the different dosages of adsorbent. Sequence analyses showed that the appropriate concentration of H-LaOCO addition increased the contents of several polyphosphate accumulating organisms (PAOs) at genus level in sludge.
本研究展示了协同强化生物废水中磷（P）的化学和生物去除的发明，这是通过将生物反应器暴露于不同水平的基于镧的吸附剂来实现的。我们制备了一种高性能的 LaOCO 微吸附剂（H-LaOCO）并将其添加到序批式反应器中。当活性污泥暴露于 40mg/L 的 H-LaOCO 40d 时，出水总磷（TP）浓度显著降低至约 0.18mg/L，去除率稳定在 96.4%，优于生物除磷（BPR）。还详细研究了 H-LaOCO 剂量对生物废水处理中 P 去除的影响。H-LaOCO 吸附剂不仅可以通过自身的化学键合捕获 P，还可以增加胞外聚合物（EPS）中蛋白质（PN）的含量，并改变 EPS 的官能团以化学吸附 P。此外，16s rDNA 分子分析的结果表明，吸附剂不同剂量会改变物种丰富度和微生物多样性。序列分析表明，适当浓度的 H-LaOCO 增加了污泥中几种聚磷酸盐积累菌（PAO）属水平的含量。
