Center of Excellence on Environmental Research and Innovation, Faculty of Engineering, Naresuan University, Phitsanulok, 65000, Thailand.
Civil and Environmental Engineering and Construction Department, University of Nevada, Las Vegas, NV, 89154-4015, USA.
Environ Pollut. 2021 Oct 1;286:117307. doi: 10.1016/j.envpol.2021.117307. Epub 2021 May 6.
This work aimed to study the performance of paraquat removal by cell-immobilized ceramics. Two strains of paraquat degrading bacteria, Pseudomonas putida and Bacillus subtilis, were separately immobilized on the ceramic with and without wastewater sludge addition. Results showed that the ceramic surface with sludge has more functional groups and a more highly negative charge on the surface than the original ceramic. The ceramic with sludge had 2-3-fold of the immobilized cells higher than that of the control (without sludge) and less leaching of the immobilized cells. The sludge addition at 20% (w/w) to the ceramic provided the highest cell adhesion for both P. putida and B. subtilis. The paraquat removal efficiencies were higher than 98%, while the control ceramic could remove only 77 ± 1.2%. The immobilized cells on ceramic with sludge provided a significant degree of dissolved organic nitrogen reduction (82%) during the paraquat removal. Most organic nitrogen in paraquat was biologically mineralized (ammonified). Findings from this work suggest the superiority of ceramic with sludge in mineralizing organic nitrogen associated with paraquat.
本研究旨在探讨固定化陶瓷对百草枯的去除性能。分别将两株百草枯降解菌（恶臭假单胞菌和枯草芽孢杆菌）固定在添加和未添加废水污泥的陶瓷上。结果表明，含污泥的陶瓷表面具有更多的功能基团和更高的表面负电荷。含污泥的陶瓷固定化细胞数量比对照组（不含污泥）高 2-3 倍，且固定化细胞的浸出率较低。污泥添加量为陶瓷的 20%（w/w）时，对恶臭假单胞菌和枯草芽孢杆菌的细胞黏附效果最佳。百草枯的去除效率均高于 98%，而对照组陶瓷仅能去除 77±1.2%。含污泥的陶瓷固定化细胞在去除百草枯的过程中，可有效降低溶解有机氮（DON），降幅达 82%。百草枯中的大部分有机氮被生物矿化（氨化）。本研究结果表明，含污泥的陶瓷在矿化与百草枯相关的有机氮方面具有优势。
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