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DOI£º10.11918/j.issn.0367-6234.2015.02.015

·ÖÀàºÅ:X703.1

»ù½ðÏîÄ¿:¹ú¼Ò¿Æ¼¼ÖØ´óרÏîˮרÏî(2012ZX07202-005); ºÓÄÏÊ¡»ù´¡ÓëÇ°Ñؼ¼ÊõÑо¿¼Æ»®ÏîÄ¿(122300410292).



Treatment of low C/N (P) domestic sewage using terminal intermittent aeration Aª¬ª©2/O technique

LUO Yahong^1,2, LI Dong¹, ZENG Huiping¹, CAI Yanan¹, XU Da¹, ZHANG Jie^1,3

(1.Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering(Beijing University of Technology), 100124 Beijing, China; 2.School of Environment, Henan Key Laboratory for Environmental Pollution Control, Key Laboratory for Yellow and Huai River Water Environmental and Pollution Control(Henan Normal University), Ministry of Education, 453007 Xinxiang, Henan, China; 3.State Key Laboratory of Urban Water Resource and Environment(Harbin Institute of Technology), 150090 Harbin, China)

Abstract:

To enhance the simultaneous removal of nitrogen (N) and phosphorus (P) of low C/N (P) ratio sewage by A²/O technique, and ensure the effluent meet the first class level A standard of GB18918¡ª2002, two patterns of A²/O technique were conducted to treat the experimental sewage. Pattern 1 was the A²/O technique with the carrier, under the optimized conditions of ª§tª­ª©ª«HRª«ªªª§=8.2 h, ª§R=ª§80%, ª§r=ª§250%-300%, ª§ª©¦Ñ(ª«DOª«)=ªªª§ª©1.5-ªª0.5 mg/L, the concentration of TP in effluent of the system still exceeded the standard. Pattern 2 was the improved pattern 1¡ª terminal intermittent aeration A²/O technique with the carrier, which contained an intermittent aeration zone following the aerobic zone, meanwhile, the approaches of sludge return and discharge were changed. The novel system with the long ª§tª­ª©ª«SRª«ªªª§ of 22.3 d ran at the conditions of the optimal operating modes above-mentioned for A²/O zone, ª§tª­ª©ª«HRª«ªª=ª§4 h for the intermittent aeration zone, and the aeration cycle was 1 h: aeration time was 1 min ª§(¦Ñ(ª«DOª«)=ª§0.3-0.5 mg/L) and settling time was 59 min. The operational results showed that the average removal rate of COD, NH₄ª¬ª©+ªª-N, TP and TN reached 87.8%, ª©99.1%,ªª 95.5% and 90.8%, respectively. The nitrosation rate of the effluent was above 70%, and DPAO/PAO ratio in sludge was 95.65%, the final effluent of the system met the first class level A of the national standard through the pathway of shortcut nitrification and denitrifying nitrogen and phosphorus removal.

Key words:  improved A²/O technique  low C/N ratio sewage  denitrifying phosphorus removal  partial nitrification