School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China; School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China.
Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China.
Water Res. 2018 Aug 1;139:144-157. doi: 10.1016/j.watres.2018.03.076. Epub 2018 Mar 30.
A win-win strategy by the integration of wastewater treatment with value-added products production through a vertical-algal-biofilm enhanced raceway was investigated in the present study. Raceway pond was enhanced by vertically setting the biofilm in the system with a certain interval distance that could be adjusted for different light conditions and wastewater types. Two types of synthetic wastewater were treated with suitability-proven materials as biofilm carriers under four operation distances. Composition of the harvested algal biomass was analyzed. Coral velvet with 5-8 mm length villus was the optimal carrier, since it was durable and with high biomass productivity (6.95-8.11 g m·day). Nutrients in the wastewaters were efficiently removed with the COD, TN and TP reduction of over 86.61%, 73.68% and 89.85%, respectively. Wastewater with the low nutrients concentration experienced lower biomass and lipid productivity but larger biodiesel productivity and higher nutrient removal efficiency. In addition, as the operation distance increased, wastewater treatment efficiency was first increased but then decreased, while algal biomass footprint production was decreased. Differences in nutrients removal efficiencies were mainly due to the distance difference, which caused different biofilm culture surface areas and light regimes. The optimal operation distance as a function of the efficient nutrient removal and biodiesel production in this study was 6 cm.
本研究通过垂直藻-生物膜强化跑道的集成，探讨了将废水处理与增值产品生产相结合的双赢策略。通过在系统中垂直设置生物膜，并保持一定的间隔距离，以适应不同的光照条件和废水类型，来增强跑道池塘。在四种操作距离下，使用经过适用性验证的材料作为生物膜载体，处理了两种合成废水。分析了收获的藻生物质的组成。长度为 5-8 毫米的珊瑚绒具有最佳的载体，因为它耐用且具有较高的生物质生产力（6.95-8.11 g·m·day）。废水中的营养物质被有效地去除，COD、TN 和 TP 的去除率分别超过 86.61%、73.68%和 89.85%。低营养浓度的废水生物量和脂质生产力较低，但生物柴油生产力和养分去除效率较高。此外，随着操作距离的增加，废水处理效率先增加后降低，而藻生物质足迹的产量则降低。养分去除效率的差异主要归因于距离差异，这导致了不同的生物膜培养表面积和光照条件。在这项研究中，作为高效养分去除和生物柴油生产的函数，最佳的操作距离为 6cm。
