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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

Postal Subscription Code 80-973

2018 Impact Factor: 3.883

Front Envir Sci Eng Chin    2010, Vol. 4 Issue (4) : 430-437    https://doi.org/10.1007/s11783-010-0247-5
RESEARCH ARTICLE
Impact of total organic carbon and chlorine to ammonia ratio on nitrification in a bench-scale drinking water distribution system
Yongji ZHANG1, Lingling ZHOU2(), Guo ZENG1, Huiping DENG1, Guibai LI3
1. Key Laboratory of Yangtze River Water Environment, Ministry of Education (Tongji University), Shanghai 200092, China; 2. State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai 200092, China; 3. School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China
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Abstract

Nitrification occurs in chloraminated drinking water systems and is affected by water quality parameters. The aim of this study was to investigate the impact of total organic carbon and chlorine to ammonia ratio on nitrification potential in a simulated drinking water distribution system as during chloramination. The occurrence of nitrification and activity of nitrifying bacteria was primarily monitored using four rotating annular bioreactors (RAB) with different chlorine to ammonia ratios and total organic carbon (TOC) levels. The results indicated that nitrification occurred despite at a low influent concentration of ammonia, and a high concentration of nitrite nitrogen was detected in the effluent. The study illustrated that reactors 1(R1) and 3 (R3), with higher TOC levels, produced more nitrite nitrogen, which was consistent with the ammonia-oxidizing bacteria (AOB) counts, and was linked to a relatively more rapid decay of chloramines in comparison to their counterparts (R2 and R4). The AOB and HPC counts were correlated during the biofilm formation with the establishment of nitrification. Biofilm AOB abundance was also higher in the high TOC reactors compared with the low TOC reactors. The chlorine to ammonia ratio did not have a significant impact on the occurrence of nitrification. Bulk water with a high TOC level supported the occurrence of nitrification, and AOB development occurred at all examined chlorine to ammonia dose ratios (3∶1 or 5∶1).

Keywords nitrification      drinking water      ammonia- oxidizing bacteria (AOB)      chloramines      organic carbon      heterotrophic bacteria     
Corresponding Author(s): ZHOU Lingling,Email:Zhou_LL@163.com   
Issue Date: 05 December 2010
 Cite this article:   
Yongji ZHANG,Lingling ZHOU,Guo ZENG, et al. Impact of total organic carbon and chlorine to ammonia ratio on nitrification in a bench-scale drinking water distribution system[J]. Front Envir Sci Eng Chin, 2010, 4(4): 430-437.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-010-0247-5
https://academic.hep.com.cn/fese/EN/Y2010/V4/I4/430
Fig.1  

Effluent ammonia-N concentration in the R1 and R3 (TOC= 3.0-4.0 mg·L-1)

Fig.2  

Effluent ammonia-N concentration in the R2 and R4 (TOC= 0.5-1.0 mg·L-1)

Fig.3  

Effluent nitrite-N concentration in the R1 and R3 (TOC= 3.0-4.0 mg·L-1)

Fig.4  

The variation of nitrite-N concentration in the R2 and R4 (TOC= 0.5-1.0 mg·L-1)

Fig.5  

Effluent chloramines concentration in the R1 and R3 (TOC= 3.0-4.0 mg·L-1)

Fig.6  

Effluent chloramines concentration in the R2 and R4 (TOC= 0.5-1.0 mg·L-1)

Fig.7  

Biofilm HPC concentration in the four reactors

Fig.8  

Biofilm AOB concentration in the R1 and R3

Fig.9  

Biofilm AOB concentration in the R2 and R4

Tab.1  

Two-level factorial experimental design (Cl2: N ratio, TOC)

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