International Journal of Environmental Science and Development

Abstract—In spite of wastewater from shrimp culture production contains high amount of ammonia nitrogen that is very toxic to shrimps, it will be available to reuse due to its good characteristic in terms of optimum salinity. To reuse this wastewater, ammonia nitrogen should be removed to the lower level than the toxic level. Also, the test for the effect of shrimp performance from wastewater reuse should be investigated. To succeed in this goal, a laboratory scale study was conducted to determine ammonia nitrogen removal by using aerobic and anoxic recirculation systems and the effects of recirculation water to growth and survival rate of white shrimp PL (L. vannamei). The experiments used to evaluate efficiency of aerobic and anoxic treatment were conducted at shrimp farm located at Chachoengsao Province, Thailand. Three treatment groups including fresh sea water (1), recycled without treatment (2) and recycled with treatment (3) were performed. The shrimp production wastewater with NH3-N of 13.14±3.54 mg/L was passed through the designed reactors sizing of 6 L. The result showed that nitrifying bacteria converted approximately 98% NH3-N to be NO3 --N. For group (1) and (2) operated without bacteria, it was found that only 5% and 25% was converted to NO3 --N. Also, NO3 --N was converted to be N2 during denitrification while TN was approximately removed by 5% and 84% for group (2) and (3), respectively. The rate of N2 production in group (3) was about 68 ml/m3/day. The COD: N ratio for the anoxic period was 5.6 g of COD/g of NO3 --N. The wastewater recirculation affected the survival and growth rate of shrimp slightly. The growth and survival rate of shrimp in the group (2) showed a significant lower at the end of the 3rd cycle of recirculation water rearing than in the others (p<0.05). The growth and survival rates for group (1), (2) and (3) were 47% and 62%, 24% and 26% and 41% - 53%, respectively. It was indicated that treated wastewater by nitrification and denitrification recirculation systems had high potentially applied for shrimp aquaculture in closed system.

Index Terms—Shrimp Culture Wastewater, NitrogenRemoval, Nitrification, Denitrification.

^*Suchat Leungprasert is the lecturer in Department of Environmental Engineering, Faculty of Engineering, Kasetsart University (Bangkhen Campus) Bangkok, Thailand (e-mail: fengscl@ku.ac.th).
^**Pattarawan Chanakul is the master degree student in Department ofEnvironmental Engineering Faculty of Engineering Kasetsart University (Bangkhen Campus) Bangkok, Thailand (e-mail: pattarawan.c@cpf.co.th).

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Cite: Suchat Leungprasert and Pattarawan Chanakul, "The Reuse of Shrimp Culture Wastewater Treated by Nitrification and Denitrification Processes," International Journal of Environmental Science and Development vol. 1, no. 4, pp. 371-377, 2010.