Performance Investigation of a novel direct contact membrane distillation unit with air bubble injection

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL Separation and Purification Technology Pub Date : 2025-07-30 Epub Date: 2025-01-30 DOI:10.1016/j.seppur.2025.131865

Dahiru U. Lawal , Muaz Abdallah , Wail Falath , Turki Baroud , Ahmad Hussaini Jagaba , Sani I. Abba , Jamilu Usman , Suhaib M. Alawad , Mohammed Antar , Isam H. Aljundi , Qusay F. Alsalhy

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Abstract

This study proposes, develops, and evaluates a novel air-assisted direct contact membrane distillation (DCMD) unit incorporating a dual vapor condensation mechanism to enhance productivity and energy efficiency. Unlike previous studies focusing solely on an air bubble injection to improve heat and mass transfer, this research introduces an external bubble column dehumidifier to recover vapor from the air-saturated feed stream, achieving a secondary condensation process. The innovative design mitigates fouling and scaling, improves thermal efficiency, and enhances distillate flux. Experimental results demonstrate an 18% increase in condensate flux, a 7% reduction in specific thermal energy consumption, and a 7% increase in the gained output ratio compared to conventional DCMD systems. The air injection also contributes over 150% to flux improvement by reducing concentration and temperature polarization effects. This advancement establishes a practical and scalable solution for sustainable water desalination under different conditions including feed salinity, feed temperature and flowrate, coolant flowrate and temperature, and air injection flowrate.

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新型气泡喷射直接接触膜蒸馏装置的性能研究

本研究提出、开发并评估了一种新型空气辅助直接接触膜蒸馏（DCMD）装置，该装置采用双蒸汽冷凝机制，以提高生产率和能源效率。与以往的研究只关注气泡注入来改善传热传质不同，本研究引入了外部气泡柱除湿器，从空气饱和的进料流中回收蒸汽，实现二次冷凝过程。创新的设计减轻了污垢和结垢，提高了热效率，并提高了馏分通量。实验结果表明，与传统的DCMD系统相比，冷凝液通量增加18%，比热能耗降低7%，输出比提高7%。通过降低浓度和温度的极化效应，空气喷射对通量的改善也贡献了150%以上。这一进步为不同条件下的可持续海水淡化建立了实用且可扩展的解决方案，包括进水盐度、进水温度和流量、冷却剂流量和温度以及空气注入流量。

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来源期刊

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.