不同填料对人工湿地模拟柱中指示菌的去除

Effect of Fillings on Removal of Indicator Bacteria From Column of Simulated Wetland

为研究不同填料对指示菌的去除效果,选取沸石、无烟煤、页岩、蛭石、陶瓷滤料、砾石、钢渣、生物陶粒8种填料,进行垂直流人工湿地模拟柱净化污水试验。结果表明,8种填料中对3种指示菌(异养细菌、大肠菌群和粪链球菌)去除率较高的为钢渣(99.9%)和无烟煤(95.9%),推测主要是因为其出水分别呈碱性和酸性造成。除钢渣和无烟煤外,去除率较高的为沸石和蛭石,去除率较低的为陶瓷滤料和生物陶粒。相关分析结果表明6种填料(不包括钢渣和无烟煤)对指示菌去除率与填料的渗透系数间存在负相关关系,推测它们主要是通过过滤吸附的机制去除指示菌。

In order to study effect of fillings on removal of indicator bacteria （ heterotrophic bacteria, coliforms group, fecal streptococcus）, zeolite, anthracite, shale, vermiculite, ceramic filter media, gravel, blast furnace steel slag and bioceramic were chosen as fillings in columns of simulated wetland in a wastewater treatment experiment. Results show that anthracite and steel slag were the highest in bacteria-removing efficiency, being 95.9% and 99.9% respectively, probably because the effluent from the two columns was acidic and alkaline, respectively. Vermiculite and zeolite came next, while ceramic filter media and bio-ceramic followed in the rear. Correlation analysis revealed negative correlation existed between indicator bacteria removing efficiency and permeability of the six different fillings （except steel slag and anthracite） , suggesting that filtration absorption is the mechanism of the fillings removing indicator bacteria.