Use of bioremediated sewage effluent for fish survival
2012
Waqar, K.
Two fresh water fish species Tilapia (Oreochromis mossambicus) and Common Carp (Cyprinus carpio) were cultured to investigate the survival rate in bioremediated sewage effluent of Shehzad Town at National Agricultural Research Center (NARC), Islamabad. The experiment was laid out in Complete Randomized Design (CRD). Two earthen ponds one with fresh water and second with bioremediated sewage effluent, with dimension of 60x40 Ft with 05 Ft depth were selected at Fisheries and Aquaculture Programme, NARC. Fish survival was investigated after fortnight sampling. Physicochemical parameters of bioremediated water were within permissible limit recommended for fish. Less than 1 % survival was observed in bioremdiated water pond whereas 100% fish survival was recorded in fresh water pond. Further investigation showed higher level of Ammonical nitrogen (31.08 mg/l), Nitrate nitrogen (18.58 mg/l) and Chlorides (39.61 mg/l) in bioremediated sewage water that were main cause of fish mortality. Hundred percent fish survival was recorded in bioremediated sewage effluent after phytoremediation with Coontail (Ceratophyllum demersum) plant that has potential of removing ammonia, nitrates and chlorides from sewage waste water. This study showed that bioremediated sewage water of Shehzad Town at NARC is although within permissible limit for irrigation purpose but required further treatment for removal of ammonical nitrogen, nitrate nitrogen and chlorides to render it fit for fish cultivation. This was achieved through phytoremdiation with Coontail (Ceratophyllum demersum).
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