Yuansheng Tang , Wentian Zheng , Guangxing Yang , Wei Bi , Fengmi Zeng , Lu Xiao , Xianhui Li
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引用次数: 0
Abstract
Membrane contactors as an emerging separation technology exhibit great potential for ammonia recovery due to the thermal and chemical stability. However, membrane wetting remains a significant challenge, hindering its broader industrial application. This study explores the effects of membrane wetting on the ammonia absorption rates through membrane contactor under varying operation conditions. The wetting depth was in-situ monitored by the ultrasonic technique. Results reveal that reducing the feed flow rate and lowering the absorbent concentration can effectively mitigate the decline in ammonia absorption rates, while increasing the feed pH does not affect the membrane wetting process but enhances the ammonia recovery. Furthermore, the rare-earth wastewater proves suitable for treatment via membrane contactor as it requires no additional low-surface-tension surfactant and has a higher ammonia concentration. Moreover, a developed model is conducted to elucidate the transport mechanism of ammonia through membrane contactor during wetting process. With the increased wetting depth during membrane contactor process, the boundary layer thickness gradually increased, significantly strengthening the transfer resistance. This study provides an insight into further understanding the ammonia mass transfer through membrane contactor under wetting conditions.
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