微氧条件下同时产甲烷反硝化工艺的试验研究

Study on Simultaneous Methanogenesis and Denitrification under Oxygenlimited Condition

在DO／COD值=0．14％的微氧条件下，接种厌氧颗粒污泥的小试UASB反应器，以含葡萄糖和NaNO3（COD／NO3^--N值=20：1）的自配水为进水，控制温度在35℃左右、HRT在6～11h之间，经过150d的运行，成功实现同时产甲烷反硝化；UASB反应器的负荷达15．5kgCOD／（m^3·d）和0．76kgNO[-N／（m^3·d）时，其对COD和NO3^--N的最高去除率分别为98．7％和100％；当DO／COD值提高至0．19％时，在负荷为13．2kgCOD／（m^3·d）和0．72kgNO3^--N／（m^3·d）下，对COD和NO3^--N的去除率仍保持在90．1％和99．6％左右。

Simultaneous methanogenesis and denitrification （SMD） was successfully realized in a lab-scale UASB reactor after 150 d of operation under oxygen-limited condition when DO/COD ratio was 0.14%, which was inoculated with anaerobic granular sludge. The influent was synthetic wastewater containing glucose and NaNO3 with the ratio of COD to NO3 - N maintained at about 20 ： 1. The temperature was controlled at around 35 ℃, and the HRT of the UASB reactor was about 6 to 11 h. When the loading rates of COD and NO3 - N were about 15.5 kgCOD/（m3 · d） and O. 76 kgNO3- - N/（ m3 · d） respectively, the maximum removal rates of COD and NO3- -N could reach 98.7% and 100% respectively. When the ratio of DO to COD increased to O. 19% , and the loading rates of COD and NO3- - N were about 13.2 kgCOD/（m3 · d） and 0. 72 kgNO3 -N/（ m3 · d） respectively, the removal rates of COD and NO3- - N were maintained at around 90.1% and 99.6% respectively.