期刊
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
卷 9, 期 4, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2021.105697
关键词
Ammonia; Aquaculture effluent; Nitrite; Immobilized condition
资金
- University Grants Commission- Department of Atomic Energy, Government of India under the CRS scheme [UGC-DAE-CSR-KC/CRS/19/TE07/1069/1085, UGC-DAE-CSR-KC/CRS/15/IOP/01/0626]
- Biotechnology Industry Research Assistance Council, Government of India under the Biotechnology Ignition Grant [BIRAC/KIIT0200/BIG-10/17]
- Ministry of Education under the Frontier Area of Science and Technology Scheme [5-1/2014-T.S.VII]
This study demonstrates a rapid and efficient ammonia removal method using a single strain of Bacillus albus ASSF01 from the environment. The approach is capable of reducing high concentrations of ammonia compounds to acceptable levels within a short period of time, making it suitable for applications in aquaculture and environmental discharge.
Ammonia toxicity in water bodies is a global problem. Different approaches have been adopted to get the ammonia concentration in water back to permitted level (0.5 mg L-1 for aquaculture and 5 mg L-1 for environmental discharge). The existing techniques are elaborate and time consuming, often not economically viable. This study reports a single unit packed bed biofilm reactor-based treatment of Aquaculture Effluent (AE) and non-AE using a pure culture of Bacillus albus ASSF01 from environmental origin as inoculum. The strain could reduce an initial ammonia concentration of 1.7 mg L-1 to 4.7 mg L-1 to a final ammonia concentration of 0.5 mg L-1 within 12-16 h while that of 27 mg L-1, 47 mg L-1 and 100 mg L-1 to 5 mg L-1 within 42 h, 48 h, and 98 h under immobilized condition respectively. Upon scaling up the operation to 9.5 L at ambient temperature, the strain could maintain its efficiency along with simultaneous reduction of nitrite from 0.30 mg L-1 to the accepted level of 0.01 mg L-1. The parameters optimized during batch mode operation using Response surface methodology were also applicable for continuous mode operation. The isolate under immobilized condition could remove ammonia at a concentration of 7.92 mg kg(-1) of matrix from Luria Bertani broth while 41.6 mg kg(-1) of matrix from minimal medium indicating it to be suitable for environmental application. This study reports a rapid, single unit bacterial biofilm based stable continuous mode treatment strategy for ammonia removal from effluent ensuring environmental protection.
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