Influence of carbon source supplementation on the development of autotrophic nitrification and microbial community composition in biofloc technology systems
Shengjiang Chen , Li Li , Xuan Dong , Xiangli Tian
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引用次数: 0
Abstract
Biofloc technology (BFT) is an eco-friendly water management strategy in intensive aquaculture that uses carbon sources to enhance ammonia assimilation by heterotrophic bacteria (HBA). However, the effect of these carbon sources on chemoautotrophic nitrification (CAN) in BFT systems is unclear, hindering efficient practice development. We conducted a 110-day experiment to evaluate the effects of two types of carbon sources: glucose (soluble) and polyhydroxy butyrate-hydroxy valerate (PHBV, slow-release), compared to a control group without carbon source addition. The results indicated that CAN was established in all reactors. However, the peak nitrate concentration occurred later in the glucose-supplemented group on day 45, compared to day 24 in the control group and day 28 in the PHBV group. The findings align with the observation that glucose addition led to reduced abundances of bacterial amoA and nxrB genes. The treatment with PHBV supplementation closely resembled the control in terms of inorganic nitrogen and microbial profiles. However, the addition of substrate and glucose apparently altered the microbial community. Microbial samples were clustered into three distinct groups, with biomarkers identified at the order level: Flavobacteriales & Enterobacterales for cluster I, Myxococcales for cluster II, and Rhodobacterales & Micrococcales for cluster III. These clusters and biomarkers were closely associated with environmental factors. The Sloan neutral community model indicated that deterministic processes governed microbial community assembly. Notably, the relative contribution of the deterministic process increased with the addition of substrate and carbon sources. These findings provide valuable guidance for enhancing and maintaining BFT systems in aquaculture wastewater treatment.
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The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies
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