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氧化石墨烯改性聚乙烯醇和海藻酸钠凝胶珠固定化Z03在低温下的反硝化性能

Denitrification performance of Z03 immobilized by graphene oxide-modified polyvinyl-alcohol and sodium alginate gel beads at low temperature.

作者信息

Tang Meizhen, Jiang Jie, Lv Qilin, Yang Bin, Zheng Mingna, Gao Xin, Han Jindi, Zhang Yingjie, Yang Yuewei

机构信息

Department of Environmental Science, School of Life Sciences, Qufu Normal University, Qufu 273165, People's Republic of China.

出版信息

R Soc Open Sci. 2020 Mar 4;7(3):191542. doi: 10.1098/rsos.191542. eCollection 2020 Mar.

DOI:10.1098/rsos.191542
PMID:32269792
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7137976/
Abstract

Improving the effect of microbial denitrification under low-temperature conditions has been a popular focus of research in recent years. In this study, graphene oxide (GO)-modified polyvinyl-alcohol (PVA) and sodium alginate (SA) (GO/PVA-SA) gel beads were used as a heterotrophic nitrification-aerobic denitrification (HN-AD) bacteria ( Z03) carrier to enhance nitrogen removal efficiency levels at low temperatures (6-8°C). The removal efficiency of and and the variations in concentrations of extracellular polymeric substances (EPS) under different GO doses (0.03-0.15 g l) were studied. The results indicated that the addition of GO can improve the efficiency of nitrogen removal, and the highest removal efficiency level and highest carbohydrate, protein, and total EPS content levels (50.28 mg, 132.78 mg and 183.06 mg (g GO/PVA-SA gel), respectively) were obtained with 0.15 g l GO. The simplified Monod model accurately predicted the nitrogen removal efficiency level. These findings suggested that the application of GO serves as an effective means to enhance nitrogen removal by stimulating the activity of HN-AD bacteria.

摘要

近年来，提高低温条件下微生物反硝化效果一直是热门研究焦点。在本研究中，氧化石墨烯（GO）改性的聚乙烯醇（PVA）和海藻酸钠（SA）（GO/PVA-SA）凝胶珠被用作异养硝化-好氧反硝化（HN-AD）细菌（Z03）的载体，以提高低温（6-8°C）下的脱氮效率水平。研究了不同GO剂量（0.03-0.15 g l）下氨氮和亚硝酸盐氮的去除效率以及胞外聚合物（EPS）浓度的变化。结果表明，添加GO可提高脱氮效率，在0.15 g l GO时获得了最高去除效率水平以及最高的碳水化合物、蛋白质和总EPS含量水平（分别为50.28 mg、132.78 mg和183.06 mg（g GO/PVA-SA凝胶））。简化的莫诺德模型准确预测了脱氮效率水平。这些发现表明，GO的应用是通过刺激HN-AD细菌的活性来提高脱氮的有效手段。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/879a/7137976/e90066d9f46d/rsos191542-g6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/879a/7137976/f006df46f6f5/rsos191542-g1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/879a/7137976/9f38e4f1b27f/rsos191542-g2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/879a/7137976/3de04eba0cd8/rsos191542-g3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/879a/7137976/93d09d5cb42c/rsos191542-g4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/879a/7137976/042c9a2ae9d8/rsos191542-g5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/879a/7137976/e90066d9f46d/rsos191542-g6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/879a/7137976/f006df46f6f5/rsos191542-g1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/879a/7137976/9f38e4f1b27f/rsos191542-g2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/879a/7137976/3de04eba0cd8/rsos191542-g3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/879a/7137976/93d09d5cb42c/rsos191542-g4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/879a/7137976/042c9a2ae9d8/rsos191542-g5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/879a/7137976/e90066d9f46d/rsos191542-g6.jpg

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