Title :
Research on effect of simultaneous nitrification denitrification under step-feed with three-stage catching bed reactor
Author :
Zhang, Yan ; Yan, Shengyong ; Zhang, Yanqing ; Wang, Hui ; Yang, Zhengyang ; Wang, Lili
Author_Institution :
Beijing Key Lab. of Water Quality Sci. & Water Environ. Restoration Eng., Beijing Univ. of Technol., Beijing, China
Abstract :
Three-stage catching bed reactor was used to treat domestic wastewater from residential area through the step feed in order to get high efficiency of simultaneous nitrification denitrification(SND). The effect of 3 influent flow rate distribution ratios (λ) on the removal of COD NH4+-N and TN was investigated under the conditions of hydraulic retention time (HRT) =8h, DO=1.0~2.0mg/L and sludge reflux rate of 100%. The removal efficiency of TN and NH4+-N reached at 70.9%-. 96.4% separately when λ was 3 : 4 : 3; When λ was controlled in 4 : 3 : 3; 62.7% of average TN removal rate was obtained and the removal efficiency of NH4+ -N was 95.8%; When λ was adjusted to 5 : 3 : 2 , the removal efficiency of TN decreased to 58.5% .However, nitrification is still very good, 90.6% of average NH4+ -N removal rate was achieved. And more than 90% of average COD removal rate was obtained under the three projects of flow rate distribution.
Keywords :
chemical reactors; refuse disposal; sludge treatment; wastewater treatment; COD removal rate; HRT; SND; catching bed reactor; domestic wastewater; hydraulic retention time; influent flow rate distribution ratio; simultaneous nitrification denitrification; sludge reflux rate; step-feed; Biology; Civil engineering; Educational institutions; Feeds; Inductors; Nitrogen; Wastewater; SND; flow distribution ratio; nitrogen removal; step-feed;
Conference_Titel :
Mechanic Automation and Control Engineering (MACE), 2011 Second International Conference on
Conference_Location :
Hohhot
Print_ISBN :
978-1-4244-9436-1
DOI :
10.1109/MACE.2011.5988593
