Effect of aluminum-based P-inactivation agent (Al-PIA) capping on bacterial community in sediment

Purpose Aluminum-based P-inactivation agent (Al-PIA) is a promising water treatment material, which has often been used for eutrophication restoration of water bodies. Numerous studies have shown that Al-PIA can control the release of phosphorus from sediment. However, whether the Al-PIA will destroy the bacterial community structure in sediment when it is used for capping of sediment and controlling the release of phosphorus from the sediment remains unknown. Therefore, this work aimed to study the effect of thin Al-PIA capping on bacterial communities in sediments. Methods This study used the surface sediment of a lake as the research object. The bacterial community structure of the sediments before and after the Al-PIA capping was analyzed by Illumina Genome Analyzer IIx. The community succession rule of the sediment bacterial in Al-PIA capping system was studied, and the influence of Al-PIA capping on the bacterial community structure in sediments was analyzed. Results and discussion The test lasted for 45 days. The results showed that the Shannon index, Ace index, and Chao1 index of the capping system were larger than those of the control system. The diversity and abundance of the sediment bacterial community increased significantly. In the Al-PIA capping system, Proteobacteria , Bacteroides , Cyanobacteria , and Nitrospirillum were feature bacterial phyla. Meanwhile, Denitratisoma , Dechloromonas , and Cetobacterium were feature bacterial genus. Conclusion Although Al-PIA capping had a certain impact on the bacterial community structure of sediment, it basically did not destroy the stability of the ecosystem and enhanced the self-purification ability of the water bodies. The results can provide theoretical guidance for the practical use of Al-PIA for sediment restoration.