State Key Joint Laboratory of Environmental Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Laboratory of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China; Department of Chemistry College of Natural Sciences, Arbaminch University 1000, Ethiopia.
J Environ Sci (China). 2021 Jun;104:430-443. doi: 10.1016/j.jes.2020.12.027. Epub 2021 Jan 4.
Coagulation-based pre-treatment efficiency of high strength digestate of food waste (HSDFW) anaerobic digestion is negated by organic ligand-catalyzed decomposition of coagulants. In this study, an efficient HSDFW pre-treatment method, magnetic seeds (MS) coagulation, was employed by using highly stable Keggin Al nanocluster (PAC), MS and polyacrylamide (PAM), and its operation was optimized by evaluating the performance of removing turbidity, total suspended solids (TSS), chemical oxygen demand (COD), and total phosphorous (TP) phosphate. Results showed that at the optimum dosage of 4.82 g/L, PAC demonstrated excellent removals as high as 98.93% ± 0.1% of turbidity, 98.04% ± 0.1% of TSS, 58.28% ± 0.3% of total COD, 99.98% ± 0.01% of TP and 99.50% ± 0.01% of dissolved phosphate, respectively. Apparent molecular weight (AMW) and three-dimensional excitation-emission matrix (3D-EEM) fluorescence spectroscopy analyses demonstrated more efficient removal of dissolved organic matter (DOM), particularly non-biodegradable and hydrophobic components by PAC than commercial coagulant. The sedimentation was much improved from 40 min by coagulation/flocculation to about 5 min settling by MS coagulation. The PAC based magnetic coagulation (MC) presents theoretical guidance on a cost-effective and much less footprint pre-treatment alternative for high strength wastewater.
基于凝结的高固体消化物（HSDFW）厌氧消化预处理效率被有机配体催化的凝结剂分解所否定。在这项研究中，采用了一种高效的 HSDFW 预处理方法，即磁种（MS）凝结法，使用高度稳定的 Keggin Al 纳米簇（PAC）、MS 和聚丙烯酰胺（PAM），并通过评估去除浊度、总悬浮固体（TSS）、化学需氧量（COD）和总磷（TP）的性能来优化其操作。结果表明，在最佳剂量 4.82 g/L 下，PAC 对浊度、TSS、总 COD、TP 和溶解磷酸盐的去除率分别高达 98.93%±0.1%、98.04%±0.1%、58.28%±0.3%、99.98%±0.01%和 99.50%±0.01%，表现出优异的去除效果。表观分子量（AMW）和三维激发-发射矩阵（3D-EEM）荧光光谱分析表明，PAC 比商业凝结剂更有效地去除溶解有机物（DOM），特别是难生物降解和疏水性成分。沉淀从凝结/絮凝的 40 分钟大大提高到 MS 凝结的约 5 分钟沉淀。基于 PAC 的磁凝结（MC）为高固体废水提供了一种具有成本效益和占地面积小得多的预处理替代方案的理论指导。
