Abstract:

The carbon fiber ecological grass covered with photosynthetic bacteria biofilm was filled in the simulated river reaction tank to purify the slightly polluted slow-flow water. The effects of filling density of carbon fiber ecological grass，hydraulic retention time，dissolved oxygen concentration and light intensity on the removal of pollutants were studied. Comparative experiment was carried out between the carbon fiber ecological grass covered with photosynthetic bacteria biofilm and the carbon fiber ecological grass covered with the indigenous microorganism biofilm. The results showed that the increase of the filling density of carbon fiber ecological grass covered with photosynthetic bacteria biofilm will improve the removal efficiency of pollutants. With the increasing of hydraulic retention time，the water flow velocity and shear rate reduced，and the growth of biofilm was more stable. The changes of dissolved oxygen concentration and light conditions had little effect on the removal of pollutants in river water. When the filling density of carbon fiber ecological grass was 180 g/m³，hydraulic retention time was 24 h，without aeration and lighting，the removal effect of pollutants in river water could be obviously improved by the carbon fiber ecological grass covered with photosynthetic bacteria biofilm. The concentrations of COD_Mn，NH₄⁺-N，TN and TP in the effluent were below 4.52 mg/L，0.68 mg/L，1.00 mg/L and 0.17 mg/L respectively. All the effluent met the class Ⅲ water quality specified in the environmental quality standard for surface water（GB 3838—2002）. The reaction system had strong anti-shock loading capability and adapt to poor nutritional environment， which could effectively purify slightly polluted slow-flow river water.

Key words: photosynthetic bacteria, carbon fiber ecological grass, covered with biofilm, slow-flow river water, purification

摘要：

在模拟河道反应池中装填光合细菌挂膜碳纤维生态草，对微污染缓流河水进行净化处理，研究了挂膜碳纤维生态草装填密度、水力停留时间、溶解氧和光照对污染物去除效果的影响，并与河水中土著微生物挂膜碳纤维生态草进行了对比实验。结果表明，提高光合细菌挂膜碳纤维生态草装填密度会改善污染物的去除效率，增加水力停留时间会降低水流速度和剪切速率，使生物膜的生长更加稳定，溶解氧浓度和光照条件的变化对河水中污染物的去除效果影响较小。挂膜碳纤维生态草装填密度为180 g/m³，水力停留时间为24 h，无曝气和外加光照，通过光合细菌挂膜碳纤维生态草的作用，能明显改善对河水中污染物的去除效果，出水COD_Mn、NH₄⁺-N、TN、TP分别低于4.52、0.68、1.00、0.17 mg/L，达到《地表水环境质量标准》（GB 3838—2002）的Ⅲ类水标准。反应系统抗冲击负荷能力强，适应贫营养环境，能有效净化微污染缓流河水。

关键词: 光合细菌, 碳纤维生态草, 挂膜, 缓流水体, 净化

CLC Number: 

• X703.1