ABSTRACT

This study aims to optimize the self-flocculation ability of microalgae Desmodesmus sp. CHX1 by the response surface methodology (RSM). Key parameters (i.e. pH, temperature and flocculation time) that significantly affected the Desmodesmus sp.CHX1 flocculation were determined. Results show that the flocculation efficiency of Desmodesmus sp.CHX1 increased in response to the prolonged settling time, particularly within the first 6 h, given the secretion of extracellular polymers. The RSM result suggested that both temperature and time exerted more significant effects on flocculation efficiency than solution pH. In specific, the maximum flocculation efficiency could reach 94.0% under the optimal conditions with the temperature, time and pH of 12.37°C, 6.96 h and 7.98, respectively. Validation experiments further indicated the reliability of the optimal parameter conditions.

摘要

本研究旨在优化微藻Desmodesmus sp. 的自絮凝能力。CHX1 通过响应面法 (RSM)。确定了显着影响Desmodesmus sp.CHX1 絮凝的关键参数（即 pH、温度和絮凝时间） 。结果表明，竹节藻的絮凝效率鉴于细胞外聚合物的分泌，sp.CHX1 响应延长的沉降时间而增加，特别是在前 6 小时内。RSM 结果表明，温度和时间对絮凝效率的影响比溶液 pH 值更大。具体而言，在温度、时间和pH值分别为12.37℃、6.96小时和7.98的最佳条件下，最大絮凝效率可达94.0%。验证实验进一步表明了最优参数条件的可靠性。