Modeling Nitrogen Recovery and Water Transport in Gas-Permeable Membranes

IF 11.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL Water Research Pub Date : 2024-11-08 DOI:10.1016/j.watres.2024.122771

C. Da Silva, A. Serra-Toro, V. Pelizzaro, F. Valentino, S. Astals, F. Mas, J. Dosta

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Abstract

This study presents a new modeling approach for nitrogen recovery for gas-permeable membrane (GPM) contactors, including both ammonia and water transport dynamics. A distinct feature of the model is its capacity to model water transport across the membrane, which has been overlooked in most publications. Osmotic pressure differences are used to predict the behavior of ammonia and water transport in the GPM. Experiments carried out to develop, test and calibrate the model examined the dynamics of ammonia and water transport through the GPM at various nitrogen concentrations. Specifically, the GPM contactor was tested for nitrogen recovery from high-strength synthetic wastewaters (2.4-10.6 g N/L) at 35°C and at pH 9. The initial volume of the trapping solution (diluted H₂SO₄) was 10 times lower than that of the synthetic wastewater, aiming to concentrate the recovered nitrogen. The estimated ammonia transport constant (K_m) ranged between (1.2 – 2.1)·10^-6 m/s and water transport constant K_w between (2.8 – 8.2)·10^-10 m/(s bar). Numerical determination of the model parameters revealed high R² values, demonstrating strong agreement with experimental data.

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透气膜中的氮回收和水传输建模

本研究介绍了气体渗透膜（GPM）接触器氮气回收的新建模方法，包括氨气和水的传输动力学。该模型的一个显著特点是它能够模拟水在膜上的传输，而这一点在大多数出版物中都被忽视了。渗透压差用于预测 GPM 中氨和水的传输行为。为开发、测试和校准模型而进行的实验研究了不同氮浓度下氨和水通过 GPM 的动态迁移。具体而言，在 35°C 和 pH 值为 9 的条件下，测试了 GPM 接触器从高浓度合成废水（2.4-10.6 克氮/升）中回收氮的情况。捕集溶液（稀 H2SO4）的初始体积比合成废水低 10 倍，目的是浓缩回收的氮。估计的氨迁移常数 (Km) 在 (1.2 - 2.1)-10-6 m/s 之间，水迁移常数 Kw 在 (2.8 - 8.2)-10-10 m/（s bar）之间。对模型参数的数值测定显示出很高的 R² 值，表明与实验数据非常吻合。

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来源期刊

Water Research 环境科学-工程：环境

CiteScore

20.80

自引率

9.40%

发文量

1307

审稿时长

38 days

期刊介绍： Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.