微量元素对废水中光合细菌生长的影响

摘要

To improve the wastewater treatment efficiency and enhance the resource recovery efficiency,this paper studied the effects of trace elements,Fe,Mn,Cu,Zn,Co,Mg,on photosynthetic bacteria（PSB） growth in wastewater.Two most prominent factors that influence the biomass of PSB were identified through single element design.Optimal concentrations of these trace elements were found through the Box-Behnken design and the response surface analysis.The results showed that the best situation was as follows： 0.66 mmol·L-1 Fe2＋and 0.16 mmol·L-1 Mg2＋,the maximum biomass of PSB reached 1 483.5 mg/L,the maximum COD removal ratio was 89.1%,and the additional cost was RMB 0.033 Yuan/t.The confirmatory tests showed that the combination of Fe and Mg achieved a PSB biomass of 1 380 mg·L-1after 72 h,which was 57% higher than the control.Fe and Mg could promote PSB growth in wastewater and enhance the resource recovery efficiency.%为了强化光合细菌污水资源化效率,研究微量元素对废水中光合细菌（PSB）生长的影响,利用单因素设计法找出影响菌体产量的2个最显著的因素,以Box-Behnken设计法及响应面分析法确定了主要影响因素的最佳浓度.研究表明：0.66 mmol/L的Fe2＋与0.16 mmol/L的Mg2＋混合时,PSB菌体产量最高,可达到1 483.5 mg/L,COD去除率最高达到89.1%,成本最低达到0.033元/t.验证结果表明Fe和Mg组合在72 h时菌体产量达到1 380 mg/L,比空白提高了57%.微量元素Fe和Mg组合可促进废水中PSB的生长,可强化光合细菌污水资源化效率.