Effect of hydraulic retention time on advanced nitrogen removal performance in denitrification and partial-denitrification anammox processes: NH4+-N and organic matter from secondary influent as electron donors
Qingfeng Cheng , Jun Li , Wen-Bo Nie , Hui Tian , Lichao Nengzi , Erdeng Du , Mingguo Peng
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引用次数: 0
Abstract
The hydraulic retention time (HRT) of a denitrifying filter (DF) is crucial in influencing total nitrogen (TN) removal. Therefore, the effect of HRT on the performance of advanced synergistic nitrogen removal (ASNR) processes, including denitrification and partial-denitrification anammox (PDA), was investigated using a lab-scale DF. NH4+-N and organic matter from the secondary influent were utilized as electron donors. As the HRT decreased from 8 to 2 h, the filtered effluent TN increased from 0.51 to 2.45 mg/L, with the corresponding removal efficiency decreasing from 97.7 % to 88.9 %. Besides, the effluent COD ranged from 17.26 to 18.98 mg/L, with a removal efficiency between 58.5 % and 61.5 %, indicating the minimal impact from HRT variation. Furthermore, 60.9 %−63.2 % of the removed TN was eliminated via the PDA pathway, with 1.29 to 1.36 mg of COD consumed per mg of TN removal. The presence of denitrifying, anammox and hydrolytic bacteria confirmed the effectiveness of ASNR. These results demonstrated that the technique holds significant potential in practice due to its cost-effective and high TN and COD removal under low HRT.
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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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