Kavitha, Ramachandran; Dr.Bright Singh,I S(Cochin University of Science And Technology, March , 1998)
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Abstract:
Nitrification is the biological oxidation of ammonium, first to nitrite and
then to nitrate by two groups of aerobic, chemolithotrophic bacteria belonging
to the family Nitrobacteriaceae. The biological nitrification in municipal
wastewater treatment is important in those cases were ammonia removal requirement
specially exist. In a trickling filter or in an activated sludge system
nitrification is rate limiting and thus necessitates longer detention time.
The combined carbon oxidation-nitrification processes generally have low
population of nitrifiers due to a high ratio of BOD to total nitrogen in the
effluent. This necessitates, separate carbon and nitrogen oxidation processes,
which thus minimizes wash out ofthe nitrifiers. Therefore, a separate stage
nitrification has become essential to achieve faster and efficient removal of
ammonia from the wastewater. The present work deals with the development
of bio reactor for nitrifying of sewage as the tertiary process so that the
treated wastewater can be used for irrigation, algal culture or fish culture
Description:
School of environmental studies, Cochin University of Science And Technology
Manju, N J; Dr.Bright Singh,I S(Cochin University of Science and Technology, October , 2007)
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Abstract:
This thesis entitled Development of nitrifying ans photosynthetic sulfur bacteria based bioaugmentation systems for the bioremediation of ammonia and hydregen sulphide in shrimp culture.
the thesis is to propose a sustainable, low cost option for the mitigation of toxic ammonia and hydrogen sulphide in shrimp culture systems. Use of ‘bioaugmentors’ as pond additives is an emerging field in aquaculture. Understanding the role of organisms involved in the ‘bioaugmentor’ will obviously help to optimize conditions for their activity.The thesis describes the use of wood powder immobilization of nitrifying consortia.Shrimp grow out systems are specialized and highly dynamic aquaculture production units which when operated under zero exchange mode require bioremediation of ammonia, nitrite nitrogen and hydrogen sulphide to protect the crop. The research conducted here is to develop an economically viable and user friendly technology for addressing the above problem. The nitrifying bacterial consortia (NBC) generated earlier (Achuthan et al., 2006) were used for developing the technology.Clear demonstration of better quality of immobilized nitrifiers generated in this study for field application.
Description:
National Centre for Aquatic Animal Health, School of Environmental
Studies, Cochin University of Science and Technology