Different substrate materials for phosphorus removal from wastewaters in constructed wetlands
2018
Gokalp, Zeki | Taş, İsmail
Phosphorus (P) is commonly considered as the limiting nutrient with respect to the eutrophication of water bodies. Therefore, wastewater treatment plants, either conventional or natural, must meet maximum P discharge limits. While various chemicals are used in conventional wastewater treatment plants, substrate materials play significant roles in phosphorus removal in natural treatment systems, also called constructed wetlands. Constructed wetland technology is commonly used for domestic wastewater treatment especially in rural sections. Emergent aquatic plants are grown in specially designed basins filled with substrate material to filter pollutants from wastewaters. Phosphorus removal is largely dependent on surface characteristics and pore structure of the substrate materials used in constructed wetland basins. Pumice and zeolite-like volcanic originated natural materials and fly ask like waste materials are commonly used to enhance phosphorus removal efficiency of substrate materials. These materials mostly used in certain mixture ratios with sand and gravel filter material. In this study, information was provided about general phosphorus removal mechanisms, surface characteristics of different substrate materials and their phosphorus removal efficiencies.
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