College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China.
J Hazard Mater. 2011 May 15;189(1-2):69-75. doi: 10.1016/j.jhazmat.2011.01.115. Epub 2011 Mar 1.
This study aims at evaluating the impacts of PAM addition on activated sludge performance. Four lab-scale sequencing batch reactors (SBRs), each with a working volume of 3L, were investigated with different PAM concentrations. Experiments were conducted with varying organic loading rate and the sludge volume index (SVI), particle size, zeta potential, specific oxygen uptake rate (SOUR), mixed liquor suspended solids (MLSS), COD and ammonium removal efficiency were monitored over a 105-day period. The results showed that all of the PAM addition not only improved the removal efficiencies of COD and ammonium, but also exhibited some advantages on sludge performance. It was found that the sludge performance of settling property, flocculation and microbial activity increased with increasing concentration of PAM. However, high level of PAM (1mg/L) led to the formation of large amounts of loose-structure flocs, which eliminated dissolved oxygen transfer and caused the sludge disintegration, resulting in bad settleability and lower microbial activity. In this way, when the dosage of PAM was 0.1mg/L, the sludge had the best settling property and activity.
本研究旨在评估 PAM 添加对活性污泥性能的影响。采用不同 PAM 浓度，对四个 3L 工作体积的实验室规模序批式反应器（SBR）进行了研究。实验在不同有机负荷率和污泥体积指数（SVI）、粒径、zeta 电位、比耗氧速率（SOUR）、混合液悬浮固体（MLSS）、COD 和氨氮去除效率的条件下进行，监测期为 105 天。结果表明，PAM 的添加不仅提高了 COD 和氨氮的去除效率，而且对污泥性能也有一些优势。发现污泥沉降性能、絮凝性和微生物活性随 PAM 浓度的增加而提高。然而，高浓度的 PAM（1mg/L）会导致大量松散结构絮体的形成，从而消除溶解氧的传递，并导致污泥解体，从而使沉降性能变差，微生物活性降低。这样，当 PAM 的投加量为 0.1mg/L 时，污泥具有最佳的沉降性能和活性。
