Comparison Analysis of Sludge Nitrification Activity Before and After Micro bulking with Low Dissolved Oxygen
ZUO Jin long,WANG Shu ying,PENG Zhao xu,JIANG An xi,LIU Yang,PENG Yong zhen and SUN Zhi rong
DOI:10.11835/j.issn.1674-4764.2009.04.023
Received ,Revised , Accepted , Available online July 01, 2015
Volume ,2009,Pages 117-122
- Abstract
In order to investigate the variation of sludge nitrification activity before and after micro bulking with low dissolved oxygen(DO), with mean DO value of 0.6mg/L-0.9 mg/L，the sequence batch reactor (SBR) was employed to test the oxygen consumption velocity curves before and after micro bulking. The results showed that COD removal ability increased, whereas the ammonia nitrogen removal effect was decreased with micro bulking of sludge. The oxygen consumption velocity curves before and after micro bulking showed that the total activity of activated sludge was 67.72 mgO2/gVSS·h before micro bulking, of which nitrification activity was 43.12 mgO2/gVSS·h, that is, 63.67% of the total activity. And the total activity of activated sludge was 90.49 mgO2/gVSS·h after micro bulking, of which nitrification activity was 23.98 mgO2/gVSS·h, that is, 26.51% of the total activity. The low DO value was the limited substrates for microorganism growth. When activated sludge was in the state of micro bulking, the filamentous bacteria were the dominant bacteria, whereas the nitrification bacteria were subordinate. Thus the total nitrification activity of activated sludge decreased.