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Comparative investigation on heterotrophic denitrification driven by different biodegradable polymers for nitrate removal in mariculture wastewater: Organic carbon release, denitrification performance, and microbial community by Yuna Feng; Lu Wang; Zhendong Yin; Zhengguo Cui; Keming Qu; Dawei Wang; Zhanying Wang; Shengmin Zhu; Hongwu Cui is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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Heterotrophic denitrification is widely studied to purify freshwater wastewater, but its application to seawater wastewater is rarely reported. In this study, two types of agricultural wastes and two types of synthetic polymers were selected as solid carbon sources in denitrification process to explore their effects on the purification capacity of low-C/N marine recirculating aquaculture wastewater (NO 3 --N 30 mg/L, salinity 32‰). The surface properties of reed straw (RS), corn cob (CC), polycaprolactone (PCL) and poly3-hydroxybutyrate-hydroxypropionate (PHBV) were evaluated by Brunauer-Emmett-Teller, Scanning electron microscope and Fourier-transform infrared spectroscopy. Short-chain fatty acids, dissolved organic carbon (DOC), and chemical oxygen demand (COD) equivalents were used to analyze the carbon release capacity. Results showed that agricultural waste had higher carbon release capacity than PCL and PHBV. The cumulative DOC and COD of agricultural waste were 0.56-12.65 and 1.15-18.75 mg/g, respectively, while those for synthetic polymers were 0.07-1.473 and 0.045-1.425 mg/g, respectively. The removal efficiency of nitrate nitrogen (NO 3 --N) was CC 70.80%, PCL 53.64%, RS

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Author

Yuna Feng; Lu Wang; Zhendong Yin; Zhengguo Cui; Keming Qu; Dawei Wang; Zhanying Wang; Shengmin Zhu; Hongwu Cui

Publisher

Frontiers Media SA

Published

2023

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)