以可降解聚合物为碳源和生物膜载体去除地下水中的硝酸盐

Removal of nitrate from groundwater was investigated using biodegradable meal box (BMB) as carbon sources and biofilm carriers. The experimental results show that low temperatures affect significantly denitrification efficiency using BMB as carbon sources. Denitrification rates at 5 ℃ and 10 ℃ were 5 % and 13 % of rates observed at 30 ℃, respectively. Denitrification supported by BMB could tolerate a relatively wide range of variation of pH and DO in influent. Denitrification rates ranged from 11.2mg/L/h to 15.8mg/L/h at pH 4.5-9.5. Nitrite concentration in effluent had little difference with pH 4.5-8.5 in influent. When DO concentration was between 0.9 mg/L and 5.0 mg/L, denitrification rates ranged from 12.6 mg/L/h to 15.8 mg/L/h, and NO2-N concentration never exceeded 0.15mg/L, which meets national standard of China for drinking water.