On-site filtration experiments were carried out at the local Common Effluent Treatment Plant (CETP) to measure the properties of the waste activated sludge (WAS). The consequences of several operational parameters such as effect of pressure, filtration media, coagulant addition, etc. were studied. To better understand the role of hydrodynamics as well as the biological content, a comparison was made between the activated sludge (AS) and WAS cake and its properties. In our findings, the cake obtained in case of WAS filtration was denser as compared to the cake from AS. In the former, it was found to be in the range of 2–2.5% w/v of WAS as compared to 0.25–0.5% w/v of AS. The addition of coagulant accelerated settling and in turn reduced the WAS filtration time by 10 fold. Important filtration parameters obtained for WAS were: cake resistance (α) = 1.5 × 10¹¹ m/kg, cake porosity (ε) = 0.86, cake compressibility (η) = 0.41, effective mean particle size (x) = 0.5 µm, capillary number (N_c) = 2.7 × 10^–3, irreducible saturation (S_∞) = 0.155 and threshold pressure (P_b) = 1 × 10⁵ N/m².

在当地的普通污水处理厂（CETP）进行了现场过滤实验，以测量废活性污泥（WAS）的性质。研究了几个操作参数的影响，例如压力，过滤介质，添加的凝结剂等。为了更好地了解流体动力学的作用以及生物学含量，对活性污泥（AS）和WAS滤饼及其性能进行了比较。在我们的发现中，与从AS获得的滤饼相比，在经过WAS过滤的情况下获得的滤饼更致密。在前者中，发现WAS的含量在2–2.5％w / v的范围内，而AS在0.25–0.5％w / v的范围内。凝结剂的添加加快了沉降速度，从而使WAS过滤时间缩短了10倍。WAS获得的重要过滤参数为：滤饼阻力（α）= 1.5×10 ¹¹  m / kg，滤饼孔隙率（ε）= 0.86，滤饼可压缩性（η）= 0.41，有效平均粒径（x）= 0.5 µm，毛细管数（N _c）= 2.7×10 ^–3，束缚饱和度（小号_∞）= 0.155和阈值压力（P _b）= 1×10 ⁵ 牛顿/米²。