3种微藻在龟鳖养殖废水中的生长与脱氮除磷特性

Growth feature and nitrogen and phosphorus removal characteristics of three microalgae in turtle breeding wastewater

选取小球藻(Chlorella sp.)、栅藻(Scenedesmus sp.)和螺旋藻(Spirulina sp.)为试验藻种,分别接种于经沉淀池初步处理后排放的龟鳖养殖废水(取自无为县某养殖场,简称WW废水)和无任何处理直接排放的龟鳖养殖废水(取自大杨镇某养殖场,简称DY废水),考察3种微藻生长特性和对废水中氮磷的去除效果,比较其对龟鳖养殖废水的净化能力。结果表明:所选的3种微藻在两种废水中生长特性不同,DY废水中3种微藻细胞密度与生物量均大于其在WW废水中的相应指标,DY废水中小球藻、栅藻和螺旋藻的最大生物量分别为0.26 g/L、0.28 g/L和0.20 g/L。不同微藻对废水中氮磷去除效果各不相同,栅藻去除TN效果最好,最大去除率为93.65%,小球藻去除TP效果最好,最大去除率为99.46%,螺旋藻去除NH+4-N效果最好,最大去除率为98.79%。

Chlorella sp.,Scenedesmus sp. and Spirulina sp. were inoculated to two kinds of turtle breeding wastewater. One kind of wastewater discharged after preliminary treatment by a sedimentation tank( taken from a breeding plant in Wuwei County,abbreviated as WW wastewater),and the other kind of wastewater discharged without any treatment( taken from a breeding plant in Dayangzhen,abbreviated as DY wastewater). The growth feature and nitrogen and phosphorus removal characteristics of three microalgae were studied and the purification ability of three microalgae was compared. Results show that three microalgae has different growth feature in two kinds of wastewater. The cell density and biomass accumulation of three microalgae are higher in DY wastewater than in WW wastewater. The highest biomass accumulations of three microalgae in DY wastewater are 0. 26 g/L,0. 28 g/L,and 0. 20 g/L respectively. The effects of different microalgae on the removal of nitrogen and phosphorus from wastewater are different. TN can be easily removed by Scenedesmus sp. with the highest removal rate of 93. 65%,TP can be easily removed by Chlorella sp. with the highest removal rate of 99. 46%,and NH_4^+-N can be easily removed by Spirulina sp. with the highest removal rate of 98. 79%.