Fast start of CANON process to treat medium and low concentration ammonia nitrogen wastewater in upflow biofilm reactor
LIU Xiaojin1,, LIU Qi1, LIU Guangqing1, SU Bensheng1, WANG Qian2,, 1.College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China 2.Institute of Environmental Planning, Ministry of Ecology and Environment, Beijing 100012, China
Abstract:In order to achieve the fast start-up and stable operation of the CANON process under the conditions of medium and low concentration ammonia nitrogen wastewater, the volumetric nitrogen load in the start-up phase was optimized by adjusting the hydraulic retention time, dissolved oxygen and reflux ratio in the up-flow biofilm reactor, and the rapid start-up of the CANON process was studied when the influent ammonia nitrogen concentration was 200 mg·L?1. The results showed that during 1~17 d, the sludge was at the domestication stage, HRT was 12 h, DO was controlled between 0.1 mg·L?1 and 0.2 mg·L?1, and 50% reflux ratio satisfied the upflow state of sludge. During 18~60 d, HRT was gradually shortened to 8 h, DO was controlled between 0.3 mg·L?1 and 0.5 mg·L?1, and the reflux ratio increased to 150%, AOB and ANAMMOX were successfully enriched at this stage, and biofilm was preliminarily formed on the filler. On the 61st day, HRT was shortened to 6 h, the reflux ratio increased to 200%, the dissolved oxygen was controlled between 0.3 mg·L?1 and 1.0 mg·L?1, and the system start-up accelerated. At the same time, the influent nitrogen load increased to 0.795 kg· (m3·d)?1. After running to the 93 d, the average removal rates of ammonia nitrogen and total nitrogen reached 95% and 82%, respectively. The membrane forming of ANAMMOX and the start-up of CANON process successfully completed. The results of high-throughput sequencing showed that the abundance of dominant bacteria AOB and ANAMMOX increased during the whole start-up process. After completion of start-up, AOB and ANAMMOX accounted for 19.46% and 22.49% in biofilm, respectively, and belonged to Brocadiaceae and Nitrosomonadaceae, respectively. The CANON system integrated three kinds of sludge forms, such as flocs, granules and packing membranes, achieved efficient and stable operation in treating medium and low concentration ammonia nitrogen wastewater. Key words:CANON process/ upflow biofilm reactor/ fast start-up/ HRT/ dissolved oxygen/ reflux ratio.
图1CANON反应器装置示意图 Figure1.Schematic diagram of CANON reactor
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1.College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China 2.Institute of Environmental Planning, Ministry of Ecology and Environment, Beijing 100012, China Received Date: 2019-08-09 Accepted Date: 2019-10-21 Available Online: 2020-06-10 Keywords:CANON process/ upflow biofilm reactor/ fast start-up/ HRT/ dissolved oxygen/ reflux ratio Abstract:In order to achieve the fast start-up and stable operation of the CANON process under the conditions of medium and low concentration ammonia nitrogen wastewater, the volumetric nitrogen load in the start-up phase was optimized by adjusting the hydraulic retention time, dissolved oxygen and reflux ratio in the up-flow biofilm reactor, and the rapid start-up of the CANON process was studied when the influent ammonia nitrogen concentration was 200 mg·L?1. The results showed that during 1~17 d, the sludge was at the domestication stage, HRT was 12 h, DO was controlled between 0.1 mg·L?1 and 0.2 mg·L?1, and 50% reflux ratio satisfied the upflow state of sludge. During 18~60 d, HRT was gradually shortened to 8 h, DO was controlled between 0.3 mg·L?1 and 0.5 mg·L?1, and the reflux ratio increased to 150%, AOB and ANAMMOX were successfully enriched at this stage, and biofilm was preliminarily formed on the filler. On the 61st day, HRT was shortened to 6 h, the reflux ratio increased to 200%, the dissolved oxygen was controlled between 0.3 mg·L?1 and 1.0 mg·L?1, and the system start-up accelerated. At the same time, the influent nitrogen load increased to 0.795 kg· (m3·d)?1. After running to the 93 d, the average removal rates of ammonia nitrogen and total nitrogen reached 95% and 82%, respectively. The membrane forming of ANAMMOX and the start-up of CANON process successfully completed. The results of high-throughput sequencing showed that the abundance of dominant bacteria AOB and ANAMMOX increased during the whole start-up process. After completion of start-up, AOB and ANAMMOX accounted for 19.46% and 22.49% in biofilm, respectively, and belonged to Brocadiaceae and Nitrosomonadaceae, respectively. The CANON system integrated three kinds of sludge forms, such as flocs, granules and packing membranes, achieved efficient and stable operation in treating medium and low concentration ammonia nitrogen wastewater.
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