Activation of fulvic acid-like in paper mill effluents using H2O2/TiO2 catalytic oxidation: Characterization and salt stress bioassays

JOURNAL OF HAZARDOUS MATERIALS

卷:378

Article

Yao, Yuanyuan¹  Wang, Chun¹  Wang, Xiaoqi¹  Yang, Yuechao¹  Wan, Yongshan²  Chen, Jianqiu³  Ding, Fangjun⁴  Tang, Yafu¹  Wang, Zhonghua¹  Liu, Lu¹  Xie, JiaZhuo¹  Gao, Bin⁵  Li, Yuncong C.²  Sigua, Gilbert C.⁶ 

[1] Shandong Agr Univ, Coll Resources & Environm, Natl Engn & Technol Res Ctr Slow & Controlled Rel, Natl Engn Lab Efficient Utilizat Soil & Fertilize, Tai An 271018, Shandong, Peoples R China

[2] Univ Florida, IFAS, Trop Res & Educ Ctr, Dept Soil & Water Sci, Homestead, FL 33031 USA

[3] Kinggenta Ecol Engn Grp Co Ltd, State Key Lab Nutr Resources Integrated Utilizat, Linshu 276700, Shandong, Peoples R China

[4] Shandong Agr Univ Fertilizer Technol Co Ltd, Minist Agr, Key Lab Mim Acid Fertilizer, Feicheng 271600, Shandong, Peoples R China

[5] Univ Florida, Dept Agr & Biol Engn, IFAS, Gainesville, FL 32611 USA

[6] USDA ARS, Florence, SC 29501 USA

关键词: Fulvic acid-like;    Paper mill effluents;    Rice seedling;    Salt stress;    Antioxidative enzymes;   

DOI  :  10.1016/j.jhazmat.2019.05.095

来源: Elsevier

【 摘 要 】

Increasing environmental concerns about organic waste in paper mill effluents demand alternative wastewater management technology. We reported novel activation of fulvic acid-like in paper mill effluents using hydrogen peroxide (H2O2) as oxidizer and titanium oxide (TiO2) as catalyst. Spectroscopic characteristics of fulvic acid-like in paper mill effluents before and after activation (PFA and PFA-Os, respectively) were compared with a benchmark fulvic acid extracted from leonardite (LFA). Results indicated that PFA-Os exhibited less lignin structures, more functional groups and lower molecular weight than PFA, sharing much similarity with LFA. Among PFA-Os with varying degrees of oxidation, PFA-O-3 activated with 1:2 vol ratio of paper mill effluent and 30% H2O2 for 20 min digestion at 90 degrees C stands out to be the optimal for further examination of its biological activity. Bioassays with rice seed/seedling indicated that applications of LFA at 2-5 mg-C/L and PFA-O-3 at 60-100 mg-C/L significantly increased rice seed germination rate and seedling growth under salt stress imposed with 100 mM NaCl. The mechanism was mainly through reduced oxidative damage via activation of antioxidative enzymes and lipid peroxidation. This study provides the needed technical basis of safer and cleaner technologies for innovative management of paper mill effluents.

【 授权许可】

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