Optimized pre-treatment of high strength food waste digestate by high content aluminum-nanocluster based magnetic coagulation  

作　　者：Tharindu Ritigala Hailu Demissie Yanlin Chen Jiaxi Zheng Libing Zheng Jinxing Zhu Hua Fan Jiao Li Dongsheng Wang Sujithra KWeragoda Rohan Weerasooriya Yuansong Wei 

机构地区：[1]State Key Joint Laboratory of Environmental Simulation and Pollution Control,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [2]Laboratory of Water Pollution Control Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [3]State Key Laboratory of Environmental Aquatic Chemistry,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [4]University of Chinese Academy of Sciences,Beijing 100049,China [5]Beijing Environmental Engineering Technology Co.,Ltd,Beijing 100101,China [6]National Water Supply and Drainage Board,Katugastota 20800,Sri Lanka [7]National Institute of Fundamental Studies,Hantana Road,Kandy 20000,Sri Lanka [8]Department of Chemistry College of Natural Sciences,Arbaminch University 1000,Ethiopia

出　　处：《Journal of Environmental Sciences》2021年第6期430-443,共14页环境科学学报（英文版）

基　　金：supported by the National Key Research and Development Program of China (No. 2018YFD1100600);the Program of China-Sri Lanka Joint Center for Water Technology Research and Demonstration;the Chinese Government Scholarship Program (CSC No. 2018SLJ023250)。

摘　　要：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_(30) nanocluster(PAC_(30)), 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_(30) 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(3 D-EEM) fluorescence spectroscopy analyses demonstrated more efficient removal of dissolved organic matter(DOM), particularly non-biodegradable and hydrophobic components by PAC_(30) than commercial coagulant. The sedimentation was much improved from 40 min by coagulation/flocculation to about 5 min settling by MS coagulation. The PAC_(30) based magnetic coagulation(MC) presents theoretical guidance on a cost-effective and much less footprint pre-treatment alternative for high strength wastewater.

关 键 词：Magnetic coagulation Keggin nanocluster Pre-treatment Removal mechanism Cost analysis 

分 类 号：X703[环境科学与工程—环境工程]