生活污水高效培养小球藻的环境优化

为了在我国北方地区村镇用生活污水高效培养小球藻,对小球藻的生长环境(初始污水浓度、环境温度、光照强度和光照时间)进行了单因素和正交实验研究.结果表明:在单因素环境条件下,污水的初始污水浓度、环境温度、光照强度和光照时间对小球藻生长具有显著影响.最佳的初始污水浓度是将原生活污水稀释2倍,环境温度达到30 ℃,光照强度为12 000 Lux,光照时间为20 h.正交实验研究表明,生活污水培养小球藻的最优培养条件并非各环境因子最佳水平的简单叠加,而是受环境因子间耦合作用的控制,主导性环境因子是初始污水浓度和光照时间.将原生活污水稀释2倍、环境温度为30 ℃、光照强度为10 000 Lux、光照时间达16 h,此时的生活污水培养小球藻的效率最高.

Environmental optimization of high-efficiency cultivation of Chlorella in domestic sewage

In order to cultivate Chlorella effectively with domestic sewage in villages and towns in northern China, the growth environment (initial sewage concentration, ambient temperature, illumination intensity and illumination time) for Chlorella was studied by single factor and orthogonal experiments in this study. The results showed that the initial sewage concentration, ambient temperature, illumination intensity and illumination time of sewage have respectively a significant effect on the growth of Chlorella under single-factor environmental conditions. The optimum initial sewage concentration is two times dilution of raw sewage, an ambient temperature of 30 ℃, an illumination intensity of 12 000 Lux, and a illumination time of 20 h. The results of orthogonal experiments showed that the optimal culture conditions of Chlorella are not a simple overlay of environmental factors, but controlled by the coupling of environmental factors. The dominant environmental factors are the initial sewage concentration and illumination time. Two times dilution of the raw sewage, the ambient temperature of 30 ℃, the illumination intensity of10 000 Lux, the illumination time of 16 h, the sewage culture Chlorella reaches the highest efficiency at this time.