Wen-bo Liang , Yi-Fan Liu , Xiao-Li Yang , Hai-liang Song
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引用次数: 0
Abstract
Exogenous pollution contributes to river eutrophication and sediment deterioration, posing a global challenge. Traditional solutions, such as artificial aeration and submerged plants, often face efficiency and adaptability limitations. Micro/nano aeration (MA) technology, generating bubbles smaller than 1 μm with higher oxygen transfer efficiency than conventional aeration, has emerged as a promising alternative. In addition, this technology has been demonstrated to promote plant growth and increase microbial abundance. This study integrated MA with submerged plants to enhance pollutant interception and sediment restoration. High-frequency MA (1 h aeration every 2 days) facilitated rapid water quality stabilization, achieving stability within 20 days in L-MA1 and 34 days in H-MA1. During the stable period, the average removal efficiencies of COD, NH₄+-N, and TP were 51.83 %, 86.02 %, and 40.36 % in L-MA1, and 56.37 %, 92.74 %, and 57.54 % in H-MA1, respectively. These removal efficiencies were consistently higher than those observed in the control and conventional aeration groups. MA also reduced sediment OM, TN, and TP by over 50 %. The findings of the plant experiments demonstrated that Vallisneria natans and Elodea nuttallii exhibited robust growth in the MA input, with biomass levels being twice as high as those observed in CK group, standard nitrogen metabolism, and a certain degree of antioxidant capacity. Furthermore, MA altered microbial communities, increasing Chloroflexi while reducing Proteobacteria and Bacteroidota. Pseudomonas, a key heterotrophic nitrification-aerobic denitrification bacterium, facilitated simultaneous NH₄+-N and NO₃−-N removal. These findings suggest that MA, combined with submerged plants, provides an efficient approach for exogenous pollution control and sediment restoration.
期刊介绍:
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