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http://dx.doi.org/10.4491/eer.2014.S1.011

Efficiency of a hybrid solid digestion-denitrification column in suspended solid and nitrate removal from recirculating aquaculture system  

Pungrasmi, Wiboonluk (Department of Environmental Engineering, Faculty of Engineering, Chulalongkorn University)
Chaisri, Ratchadaporn (Department of Environmental Engineering, Faculty of Engineering, Chulalongkorn University)
Malaphol, Ekachai (Center of Excellence for Marine Biotechnology, Department of Marine Science, Faculty of Science, Chulalongkorn University)
Powtongsook, Sorawit (Center of Excellence for Marine Biotechnology, Department of Marine Science, Faculty of Science, Chulalongkorn University)
Publication Information
Environmental Engineering Research / v.20, no.2, 2015 , pp. 175-180 More about this Journal
Abstract
This research focused on the solid and nitrate removal efficiency in a solid digestion-denitrification column. The 20 L up-flow column consisted of 18 L acrylic column with 2 L down-comer inlet tube located in the middle. In the first part, the wastewater with high suspended solids from the Tilapia fish tank was applied into the sedimentation unit at 5 variable flow rates i.e., 11.25, 25.71, 60, 105.88 and 360 L/h. The results indicated that the flow rate of 11.25 L/h (0.57 m/h) gave the highest solid removal efficiency of $72.72%{\pm}8.24%$. However, the total suspended solids removal was highest at 360 L/h (18.13 m/h). In the second part, methanol was added as an external organic carbon source for denitrification process in a hybrid column containing settled solids. The COD:N ratios of 0.5:1, 1:1, 2:1, 3:1, 4:1, 5:1 and 6:1 were investigated and compared with control without methanol addition. This experiment was operated at the HRT of 1 h with 450 L wastewater from recirculating aquaculture pond containing 100 mg-N/L sodium nitrate. The results indicated that the COD:N ratio of 3:1 gave the highest nitrate removal efficiency of $33.32%{\pm}21.18%$ with the denitrification rate of 5,102.88 mg-N/day.
Keywords
Denitrification; Hybrid column; Nitrate; Recirculating aquaculture system; Sedimentation; Solid digestion;
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