High-density natural luffa sponge as anaerobic microorganisms carrier for degrading 1,1,1-TCA in groundwater

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• 作者：Wenbing Wang ; Yanqing Wu ; Chi Zhang
• 关键词：Natural luffa sponge ; Immobilization medium ; Anaerobic microorganism ; Biodegradation ; Groundwater contamination
• 刊名：Bioprocess and Biosystems Engineering
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：40
• 期：3
• 页码：383-393
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Biotechnology; Industrial and Production Engineering; Environmental Engineering/Biotechnology; Industrial Chemistry/Chemical Engineering; Food Science;
• 出版者：Springer Berlin Heidelberg
• ISSN：1615-7605
• 卷排序：40

文摘

Anaerobic microorganisms were applied to degrade organic contaminants in groundwater with permeable reactive barriers (PRBs). However, anaerobic microorganisms need to select optimal immobilizing material as carrier. The potential of high-density natural luffa sponge (HDLS) (a new variety of luffa) for the immobilization and protection of anaerobic microorganisms was investigated. The HDLS has a dense structure composed of a complicated interwoven fibrous network. Therefore, the abrasion rate of HDLS (0.0068 g s−1) was the smallest among the four carriers [HDLS, ordinary natural luffa sponge (OLS), polyurethane sponge (PS), and gel carrier AQUAPOROUSGEL (APG)]. The results suggest that it also had the greatest water retention (10.26 H₂O-g dry carrier-g−1) and SS retention (0.21 g dry carrier-g−1). In comparison to well-established commercialized gel carrier APG, HDLS was of much better mechanical strength, hydrophilicity and stability. Microbial-immobilized HDLS also had the best performance for the remediation of 1,1,1-TCA simulated groundwater. Analysis of the clone libraries from microorganism-immobilized HDLS showed the HDLS could protect microorganisms from the toxicity of 1,1,1-TCA and maintain the stability of microbial community diversity. The mechanism of HDLS immobilizing and protecting microorganisms was proposed as follows. The HDLS had a micron-scale honeycomb structure (30–40 μm) and an irregular ravine structure (4–20 μm), which facilitate the immobilization of anaerobic microorganisms and protect the anaerobic microorganisms.