Improving the treatment efficiency of constructed wetlands with zeolite-containing filter sands

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• 作者：Ingo Bruch^a ; Johannes Fritsche^b ; Dominik B&#xe4 ; nninger^b ; ¹ ; Ulrike Alewell^a ; Michael Sendelov^b ; Heinz Hü ; rlimann^b ; Ralf Hasselbach^c ; Christine Alewell^b ; ^{christine.alewell@unibas.ch}
• 关键词：Constructed wetlands ; Wastewater purification ; Zeolite ; Lava sand
• 刊名：Bioresource Technology
• 出版年：2011
• 出版时间：January 2011
• 年：2011
• 卷：102
• 期：2
• 页码：937-941
• 全文大小：399 K

文摘

In this study the physical and chemical properties of three different lava sands used in constructed wetlands for municipal wastewater treatment were investigated. The aim was to identify those properties and mechanisms that render lava sands as highly efficient filter media which could substitute conventional, fluviatile sands. It was shown that although lava sands per se may be suitable filter materials, the presence of zeolite minerals within the lava sands enhances the purification efficiency tremendously. Zeolites not only increase the sorption capacity, but even more important, they are able to absorb water in large amounts, which in turn leads to stronger swelling. The latter reduces hydrological conductivity considerably, resulting in a longer contact time to eliminate pollutants. A simple mineralogical survey of filter materials for the presence of zeolites may render many installations of constructed wetlands successful.