Assessing the enhanced reduction effect with the addition of sulfate based P inactivating material during algal bloom sedimentation. (August 2022)

• Record Type: Journal Article
• Authors: Liu, Xin; Sun, Xuan; Liu, Rui; Bai, Leilei; Cui, Peixin; Xu, Huacheng; Wang, Changhui
• Is Part Of: Chemosphere. Volume 300(2022)
• Publication Date: 2022-08
• Subjects: Lake restoration -- Eutrophic lake -- P inactivating materials -- Reduction effect; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2022.134656
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: The typical harm effect of algal bloom sedimentation is to increase sulfides level in surroundings, threatening aquatic organisms and human health; whereas, P inactivating materials containing sulfate are commonly attempted to be used to immobilize reactive P or to flocculate excessive algae in water columns for eutrophication control. In this study, variations in sulfate reduction during algal bloom sedimentation with the addition of sulfate based inactivating materials was comprehensively assessed based on using Al2 (SO4 )3 with comparison to AlCl3 . The results showed that addition of Al2 (SO4 )3 had more substantial effect on overlying water and sediment properties compared to those of ACl3 . Al2 (SO4 )3 can enhance sulfate reduction, resulting in temporary increase of sulfides ( p < 0.01) and quick decrease of various Fe ( p < 0.01) in overlying water and then promoting the formation of FeS and FeS2 (determined by EXAFS analysis) in sediments. Most importantly, the increased sulfides, as well as the physical barrier on sediment formed due to Al2 (SO4 )3 addition, enhanced the transformation of sulfides to odorous contaminants, increasing odorous contaminants (especially methyl thiols) production by approximately one order of magnitude in overlying water. Furthermore, the increased sulfides facilitated to the enrichment of microorganisms related to S cycles ( Thiobacillu with relative abundance of 23.8%) and even promoted to enrich bacterial genus potentially with pathogenicity ( Treponema ) in sediments. The impacts of sulfate tended to be regulated by algae concentration; however, careful management was recommended for sulfate based inactivating materials application to control eutrophication with algal blooms. Graphical abstract: Image 1 Highlights: Al2 (SO4 )3 promoted sulfate reducing, enhancing FeS and FeS2 formation in sediment. The enhanced sulfate reduction was beneficial for odorous contaminants production. The increased sulfides promoted to enrich S cycle and pathogenic related bacteria. Careful management was recommended for sulfate-material to control eutrophication.