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ZJUS-B
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology)  2015, Vol. 16 Issue (2): 145-154    DOI: 10.1631/jzus.B1400090
Articles     
Treatment of turtle aquaculture effluent by an improved multi-soil-layer system
Ying Song, Yu-ting Huang, Hong-fang Ji, Xin-jun Nie, Zhi-yuan Zhang, Chuan Ge, An-cheng Luo, Xin Chen
MOE Key Lab of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China; Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection of China, Nanjing 210042, China
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Abstract  Concentrated turtle aquaculture effluent poses an environmental threat to water bodies, and therefore needs to be treated prior to disposal. This study was conducted to assess the effect of multi-soil-layer (MSL) systems treating turtle aquaculture effluent with adding different amounts of sludge. Four MSL systems were constructed with dry weight ratios of sludge with 0%, 5%, 10%, and 20% (MSL 1, MSL 2, MSL 3, and MSL 4, respectively). The turtle aquaculture effluent had an average chemical oxygen demand (COD), ammonia nitrogen (NH4+-N) and total nitrogen (TN) concentration of 288.4, 213.4, and 252.0 mg/L, respectively. The COD/TN (C/N) ratio was 1.2. The results showed that the four MSL systems could effectively treat the COD, NH4+-N, and TN, and MSL 4 showed significantly improved NH4+-N removal efficiency, suggesting the potential of sludge addition to improve the turtle aquaculture effluent treatment. The average COD, TN, and NH4+-N removal efficiencies of MSL 4 were 70.3%, 66.5%, and 72.7%, respectively. To further interpret the contribution of microorganisms to the removal, the microbial community compositions and diversities of the four MSL systems were measured. Comparisons of the denaturing gradient gel electrophoresis (DGGE) profiles revealed that the amount of nitrifying bacteria and diversity in MSL 4 were higher than those in the other three systems. We concluded that adding 20% of sludge improved the NH4+-N removal and stability of the system for nitrification, due to the enrichment of the nitrifying bacteria in MSL 4.

Key words： Turtle aquaculture effluent      Multi-soil-layer (MSL) system      Sludge      Microbial community diversity     
Received: 27 March 2014      Published: 02 February 2015
CLC:  X703  
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Ying Song
Yu-ting Huang
Hong-fang Ji
Xin-jun Nie
Zhi-yuan Zhang
Chuan Ge
An-cheng Luo
Xin Chen
Cite this article:

Ying Song, Yu-ting Huang, Hong-fang Ji, Xin-jun Nie, Zhi-yuan Zhang, Chuan Ge, An-cheng Luo, Xin Chen. Treatment of turtle aquaculture effluent by an improved multi-soil-layer system. Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2015, 16(2): 145-154.

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http://www.zjujournals.com/xueshu/zjus-b/10.1631/jzus.B1400090     OR     http://www.zjujournals.com/xueshu/zjus-b/Y2015/V16/I2/145

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