Yuxin Li , Rongting Hu , Zhuolin Yang , Riyue Huang , Yi Jiang
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引用次数: 0
Abstract
Woody biomass is a popular carbon source used in denitrification to eliminate nitrate pollutants in different water bodies. The denitrification exhibited a low removal rate and high organic residues owing to its complex compositions. Herein, lignin, extractive, and hemicellulose were removed from representative sawdust to obtain various fractions. These fractions released carbon in static water, and the resulting solutions were used for denitrification with excess nitrate. Results showed that chemical treatment efficiently separated the main compositions, with notable changes in infrared absorption peaks at specific wavelengths. Carbon release followed second-order (determination coefficient, R2 > 0.84) and zero-order (R2 > 0.89) kinetics during rapid and slow-releasing periods, respectively. The carbon-release rate increased by 5.2 times following lignin removal, while it gradually decreased with extractive and hemicellulose removal. Lignin reduction decreased the residues of dissolved organic carbon (DOC), with 55.6 %–63.1 % of DOC remaining after denitrification. The released carbon products of reducing sugars and volatile fatty acids (VFAs) were exhausted; however, most total phenols remained after denitrification. Residual DOC mainly included soluble microbial products and fulvic-like and humic-like substances, which decreased with the removal of lignin. This study demonstrated that the limit step of carbon release in the denitrification process could be accelerated by modifying the compositions of woody biomass and revealed the accumulation characteristics for the residual organics.
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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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