以稻草为碳源和生物膜载体去除水中的硝酸盐

采用室内试验装置，研究了以农业废弃物稻草为反硝化碳源和反应介质的生物反应器对于污水中硝酸盐的去除效果及其影响因素.结果表明，以稻草为反硝化碳源和生物膜载体的反应器启动时间短,对污水中硝酸盐氮的去除效果好，且试验过程中未发现亚硝酸盐累积；进水硝酸盐浓度对装置的处理效果有一定影响,浓度过高会导致硝酸盐的去除率下降；装置对进水DO和ｐH变化有一定抗性，DO在1.0～3.5 mg/L，pH在6.5～8.5之间变化时，反应器硝酸盐的去除率变化很小，缓冲能力较强；反应器稳定性强，装置运行84 ｄ后，出水硝酸盐开始升高，硝酸盐去除率逐步降低，但去除率仍在50%以上.

Nitrate Removal from Wastewater Using Rice Straw as Carbon Source and Biofilm Carrier

In this research,agriculture waste-rice straw was investigated as the sole carbon source as well as biofilm carrier to remove nitrate from wastewater in up-flow laboratory reactors. The experimental results indicated that the startup of the system was quick and a high nitrate removal efficiency was observed. The accumulation of nitrite was not observed in this process. Moreover,high nitrate concentration in the influent had a significant effect on nitrate removal efficiency. The reactor was able to accommodate a wide range of pH (6.5-8.5) and DO (1.0-3.5 mg/L). A time-dependent decrease in nitrate removal efficiency was observed after 84 days of operation. The results showed that rice straw could be used as an economical and effective carbon source for denitrification.