Long-Term Performance and Stability of Interlayer-Free Mesoporous Silica Membranes for Wetland Saline Water Pervaporation

Abstract

Wetland water is an alternative water resource around wetland areas. However, it is typically saline due to seawater intrusion and contains high natural organic matter (NOM) that is challenging to treat. This study evaluated the stability of interlayer-free mesoporous silica matrix membranes employing a dual acid–base catalyzed sol–gel process for treatment of saline wetland water. The silica sols were prepared under a low silanol concentration, dip-coated in 4 layers, and calcined using the rapid thermal processing method. The membrane performance was initially evaluated through pervaporation under various temperatures (25–60 °C) using various feeds. Next, the long-term stability (up to 400 h) of wetland saline water desalination was evaluated. Results show that the water flux increased at higher temperatures up to 6.9 and 6.5 kg·m−2·h−1 at the highest temperature of 60 °C for the seawater and the wetland saline water feeds, respectively. The long-term stability demonstrated a stable performance without flux and rejection decline up to 170 h operation, beyond which slow declines in water flux and rejection were observed due to fouling by NOM and membrane wetting. The overall findings suggest that an interlayer-free mesoporous silica membrane offers excellent performance and high salt rejection (80–99%) for wetland saline water treatments.

Single Vs Multichannel Silica-Pectin Ultrafiltration Membranes for Treatment of Natural Peat Water

“…In both of Figure 4(a) the coated membrane of single channel and Figure 4(b) multichannel configuration can be seen the top layer have the roughness and boulders of the alumina particles substrate protruding on silica-pectin membrane surface. Moreover, the top layer silica-pectin membranes display not delicate caused by its membranes were coated direct onto microporous substrate without interlayer similar to work report by Elma et al, [4]. the silica-pectin sols was filled in the channel or bore side of the alumina substrates.…”

“…Peat water is commonly used for domestic usage in rural coastal areas households which are yet to receive clean water from the municipal water supply. However, direct consumption of peat water is not advisable, hence, a simple and versatile water treatment system such as membrane separation is useful in this case [3][4][5][6][7].…”

Banana Peels Pectin Templated Silica Ultrafiltration Membrane in Disk Plate Configuration Applied for Wetland Water Treatment

“…SEM analysis aims to determine the surface morphological structure of the membrane. The surface form of the membrane can affect the performance of membrane [14,18]. Figure 3 and Figure 4 show the SEM image of surface and cross-section silica pectin membrane by swab coating technique.…”

“…Figure 4 show cross-section image of silica pectin membrane. Cross-section identify the formation of the coating layer attached [14]. Based on Figure 4 shows top part of the membrane does not show thin film formation.…”

“…Membrane technology has long been a separation process in the industrial world because of its fast and efficient process [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. In general, there are three types of membrane process that are usually applied, it is called reverse osmosis (RO), membrane distillation (MD), pervaporation and ultrafiltration [28].…”