可沉微藻对室外光照强度的适应性试验研究  

Adaptation of Settleable Microalgae to Outdoor Natural Light Intensity

作　　者：郝晓地[1] 王欣[1] 罗玉琪[1] 曹达啓 HAO Xiao-di;WANG Xin;LUO Yu-qi;CAO Da-qi(Sino-Dutch R&D Centre for Future Wastewater Treatment Technologies,Beijing Advanced Innovation Center of Future Ubran Design,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京建筑大学北京未来城市设计高精尖创新中心中-荷未来污水处理技术研发中心,北京100044

出　　处：《中国给水排水》2020年第5期20-25,共6页China Water & Wastewater

基　　金：国家自然科学基金资助项目(51878022)。

摘　　要：在实验室条件下,通过"冲淘"压力可筛选出沉淀率高达97%的可沉微藻。可沉微藻像活性污泥一样在净化功能完成后可通过自然沉降实现藻-水分离,可为污水深度处理提供一种低耗、高效的解决方案。然而,实验室低光照[400μmol/(m^2·s)]条件下获得的可沉微藻在真实自然光强度下是否依然可以不断生长繁殖并保持对氮、磷较高的去除率,这是一个工程应用必须面对的现实问题。为此,在实验室条件下增加光照强度至接近自然光水平[800μmol/(m^2·s)],观察可沉微藻的生长情况。结果显示,高光照强度对可沉微藻具有抑制作用,使可沉微藻的生长繁殖严重受阻,并降低其光合作用活性(叶绿素a含量)。及时向反应器补充无机碳源CO_2后,可沉微藻经过一定适应期后可恢复生长,并可达到比低光照强度时还高的生物量及较高的氮、磷去除效果(90%以上)。另外,试验还考察了投加营养物硅酸盐、光/暗交替及进水模式对可沉微藻生长与净化性能的影响,结果显示出硅酸盐的双向性作用及光补充基质的优势。Microalgae with settleable rate more than 97%can be selected in the laboratory by applying“washout”pressure.The settleable microalgae can purify wastewater like activated sludge and then realize separation of algae and water through natural sedimentation,which provides a high-efficiency and low-consumption solution for advanced wastewater treatment.However,whether the settleable microalgae cultivated at low light intensity[400μmol/(m2·s)]in the laboratory can continue to grow and proliferate at natural light intensity and maintain high removal rates of nitrogen and phosphorus is a practical problem that must be considered in the application.Therefore,the light intensity was increased to close to the natural light level[800μmol/(m2·s)]and the growth of microalgae were observed in the laboratory.High light intensity inhibited the growth of microalgae and reduced their photosynthetic activity.After adding CO2 in time,the settleable microalgae restored their activity for a certain adapting period and reached to an even higher biomass and nutrient removal rates(more than 90%)compared with that at low light intensity.Besides,the effects of adding silicate,light/dark alternation and influent modes on the growth and purification properties of microalgae were also investigated.The results indicated the double effects of adding silicate and the advantage of light supplement.

关 键 词：可沉微藻 室外光照强度 光抑制 生物量 叶绿素A 营养物去除 

分 类 号：TU992[建筑科学—市政工程]