Biological treatment of shrimp production wastewater |
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Authors: | Raj Boopathy |
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Institution: | (1) Nicholls State University, Thibodaux, LA, USA |
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Abstract: | Over the last few decades, there has been an increase in consumer demand for shrimp, which has resulted in its worldwide aquaculture
production. In the United States, the stringent enforcement of environmental regulations encourages shrimp farmers to develop
new technologies, such as recirculating raceway systems. This is a zero-water exchange system capable of producing high-density
shrimp yields. The system also produces wastewater characterized by high levels of ammonia, nitrate, nitrite, and organic
carbon, which make waste management costs prohibitive. Shrimp farmers have a great need for a waste management method that
is effective and economical. One such method is the sequencing batch reactor (SBR). A SBR is a variation of the activated
sludge biological treatment process. This process uses multiple steps in the same reactor to take the place of multiple reactors
in a conventional treatment system. The SBR accomplishes equalization, aeration, and clarification in a timed sequence in
a single reactor system. This is achieved through reactor operation in sequences, which includes fill, react, settle, decant,
and idle. A laboratory scale SBR was successfully operated using shrimp aquaculture wastewater. The wastewater contained high
concentrations of carbon and nitrogen. By operating the reactors sequentially, namely, aerobic and anoxic modes, nitrification
and denitrification were achieved as well as removal of carbon. Ammonia in the waste was nitrified within 4 days. The denitrification
of nitrate was achieved by the anoxic process, and 100% removal of nitrate was observed within 15 days of reactor operation. |
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Keywords: | Nitrification Denitrification Sequencing batch reactor Aerobic Anoxic |
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