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| The start-up of dealing with reject water by ANAMMOX inoculatd with mixed sludge. |
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Abstract Under the condition of reactor in (30±0.2)℃, influent pH of 7.3 to 7.9, reject water of nitritation as influent, and initial ammonia and nitrite nitrogen loading of 0.07 and 0.10kg/(m3·d), respectively, simultaneous removal of ammonia and nitrite nitrogen were occurred in 24d in UASB reactor inoculating with mixed sludge consisted of aerobic granular sludge, anaerobic granular sludge, oxidation ditch sludge and nitritation sludge, and TN removal up to 0.99 kg/(m3·d)was obtained in 186d. At the initial period of start-up, influent concentration of ammonia and nitrite were 20, 30mg/L, and the highest up to 157, 216mg/L. The system could be resumed about 10d when it was inhibited by dissolved oxygen or about 30d by both dissolved oxygen and high nitrite during the start-up. ANAMMOX and denitrification happened simultaneously. The volume of biogas was in direct ratio with TN quantity removed and it could directly and timely indicate the operational state of the system, and what is more, the N2 percent of the biogas was about 99.8%. At the steady period, the pH was incremental but alkalinity was appreciably reduced. The stable simultaneous removal of ammonia and nitrite nitrogen were realized in less than one month and ANAMMOX started up successfully for about 180d through inoculating mixed sludge and low loading rate of ammonia and nitrite nitrogen.
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Received: 15 August 2008
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