栅藻LX1在水产养殖废水中的生长、脱氮除磷和油脂积累特性

Growth,Removal of Nitrogen and Phosphorus,and Lipid Accumulation Property of Scenedesmus sp.LX1 in Aquaculture Wastewater

利用高含油脂微藻处理废水,可以实现废水处理与生物柴油生产的耦合,已成为废水处理领域新的研究方向.研究了1株高含油脂的淡水栅藻LX1(Scenedesmus sp.LX1)在水产养殖废水中的生长、脱氮除磷和油脂积累特性.结果表明,栅藻LXl在该废水中的内禀生长速率、最大种群密度和最大种群生物量增长速率分别为0.44 d-1、7.46×106个.mL-1和0.82×106个.(mL.d)-1.培养至稳定期后,栅藻LXl对废水中的氨氮、亚硝态氮、硝态氮和磷的去除率分别为95.5%、96.3%、85.8%和98.8%;其生物量干重为0.38 g.L-1,单位藻细胞油脂含量高达31.6%.因此,栅藻LXl在水产养殖废水的净化和资源化方面具有较大优势,适于作为耦合工艺的优选藻种.

Treating wastewater by high-lipid-content microalgae,which can couple with wastewater treatment and biodiesel production,has become a new research direction in the wastewater treatment field.A high-lipid-content freshwater microalgae,Scenedesmus sp.LX1 was studied concerning its growth,removal efficiencies of nitrogen and phosphorus,and lipid accumulation property while growing in aquaculture wastewater.Results showed that the specific growth rate,maximum population density and maximum population growth rate of Scenedesmus sp.LX1 were 0.44 d-1,7.46×106 cells·mL-1 and 0.82×106 cells·(mL·d)-1,respectively.At stationary phase of training,removal efficiencies of ammonia,nitrite,nitrate and phosphorus by Scenedesmus sp.LX1 were 95.5%,96.3%,85.8% and 98.8%,respectively.It's biomass [dry weight] was 0.38g·L-1,algae lipid content was up to 31.6%.In general,Scenedesmus sp.LX1 has larger advantage in aquaculture wastewater depuration and resource utilization respect,and it can be used as the preferred algae species for coupling process.