Maruyama Hideo, Seki Hideshi
Division of Marine Bioresources, Graduate School of Fisheries Sciences, Hokkaido University, Minato-cho 3-1-1, Hakodate 041-8611, Hokkaido, Japan E-mail:
Water Sci Technol. 2020 Nov;82(9):1868-1876. doi: 10.2166/wst.2020.461.
The effect of ethylated soy protein-based bioflocculant (EtSP) as a filter aid reagent was investigated. The efficiency of EtSP as a filter aid was evaluated in terms of the specific cake resistance, α, and was compared with chitosan and polyaluminum chloride (PAC). Diatomite and kaolin were used as model particles. Total filtration resistance, R, decreased with increasing flocculant dosage (wt.%, flocculant/particle) and was almost constant in the range of 1 wt.% or more for both particles. The α value was significantly decreased from 1.01 × 10 to 9.01 × 10 m/kg for diatomite and from 5.11 × 10 to 5.20 × 10 m/kg for kaolin by the addition of EtSP in the case of 1.0 wt.%. The α value for cakes formed by EtSP was much smaller than that formed by chitosan and PAC. In the case of diatomite, in the dose range of 0.5-1.0 wt.%, the α value for cakes formed by EtSP and chitosan was almost the same. However, at the excess dose of 2.0 wt.% over, the α value formed by chitosan abruptly increased. In the case of kaolin, in the dose range of 1.0-2.0 wt.%, the α values of chitosan and PAC were mostly the same, however, these values were larger by ca. nine times than that of EtSP.
研究了基于乙基化大豆蛋白的生物絮凝剂（EtSP）作为助滤剂的效果。以比滤饼阻力α来评估EtSP作为助滤剂的效率，并与壳聚糖和聚合氯化铝（PAC）进行比较。硅藻土和高岭土用作模型颗粒。总过滤阻力R随着絮凝剂用量（重量百分比，絮凝剂/颗粒）的增加而降低，对于两种颗粒，在1重量%或更高的范围内几乎保持恒定。在添加1.0重量%EtSP的情况下，硅藻土的α值从1.01×10显著降至9.01×10 m/kg，高岭土的α值从5.11×10降至5.20×10 m/kg。由EtSP形成的滤饼的α值远小于由壳聚糖和PAC形成的滤饼的α值。对于硅藻土，在0.5 - 1.0重量%的剂量范围内，由EtSP和壳聚糖形成的滤饼的α值几乎相同。然而，在超过2.0重量%的过量剂量下，壳聚糖形成的α值突然增加。对于高岭土，在1.0 - 2.0重量%的剂量范围内，壳聚糖和PAC的α值大多相同，然而，这些值比EtSP的α值大约大九倍。
