Exogenous Compound Bacteria Enhance the Nutrient Removal Efficiency of Integrated Bioremediation Systems: Functional Genes and Microorganisms Play Key Roles
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Date
2024
Journal Title
Journal ISSN
Volume Title
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ELSEVIER
Abstract
With the continuous development of intensive mariculture, the application of the integrated bioremediation
system of aquaculture wastewater (IBSAW) is increasingly promoted. However, the process and nutrients
removal performance of the IBSAW need to be further optimized due to its immature technologies. In this study,
exogenous compound bacteria (ECB) were added to IBSAW to investigate its pollutants removal efficiency and
the relevant mechanisms. High-throughput sequencing and Geochip gene array were used to analyze the cor
relation between nutrients and bacteria, and the abundance of N and P cycling genes were quantified. Multi
variable statistics, dimensionality reduction analysis, and network analysis were applied to explore the
mechanisms of IBSAW operation. The results showed that the nutrients decreased significantly after adding ECB,
with the brush treatment group significantly outperforming the ceramsite in removing NO
3
has an advantage in removing NO
2
and PO
4 3
. Ceramsite -N. The addition of ECB and different substrates significantly affected the
composition of bacterial communities. The contents of nosZ and nirKS related to denitrification in the treatment
groups were significantly higher than those in the control group, and the contents in the brush treatment group
were significantly higher than that of ceramsite. The biomarkers Psychroserpens and Ruegeria on the biofilm of the
brush treatment group were positively correlated with nirKS, while Mycobacterium, Erythrobacter and Paracoccus,
Pseudohaliea in the ceramsite group were positively correlated with nirS and nirK, respectively. Therefore, it is
speculated that the ECB significantly promoted the increase of denitrification bacteria by affecting the compo
sition of bacterial communities, and the ECB combined with functional genera improved the efficiency of nu
trients removal in the system. This study provided a reference for understanding the process and mechanism of
nutrients removal, optimizing the wastewater purification technology of the IBSAW and improving the perfor
mance of the system.
Description
This journal article was published by Elsevier in 2024.