抄録
A lab-scale reactor for the anaerobic ammonium-oxidizing (anammox) process was operated for the treatment of digester supernatant. In this study we used gel carriers with entrapped anammox bacteria to obtain a stable and high nitrogen removal performance. In continuous feeding tests, a stable nitrogen removal performance was observed and an average nitrogen conversion rate of 3.9 kg-N · m-3 · d-1 was obtained. A maximum nitrogen removal rate of 13.7 kg-N · m-3 · d-1 was confirmed in the high-loading test. After the stable nitrogen removal performance was observed, the operation of the reactor was stopped for one or three days and then restarted, in order to simulate a temporary process shutdown. The results of this test showed that our process can recover its performance immediately after a restart. The start-up period of this process was also evaluated under digester supernatant treatment. It was clearly shown that the anammox reactor using gel carriers can be started up within two months.
