Fish wastewater with " PACP " filter and reuse of the treated water

ABSTRACT

Powdered activated carbon pellet [PACP] filter was found very effective for the removal of chemical oxygen demand [COD] and nutrients from the fish wastewater. It was found in the study that fish waste water generated from rearing tilapia fish in a glass aquarium for 48 hours had high organic and nutrient content. This high organic and nutrient containing wastewater while passed through the 30 cm PACP filter could remove 90% COD, 93% phosphate and 85% ammonia nitrogen after 10 L of fish wastewater loading. The optimum flow rate for the PACP filter was 100 ml/min. In a comparative study it was found that PACP filter had a better COD removal capacity compared to a same size granular activated carbon [GAC] filter. After 10 L loading of fish wastewater GAC filter showed only 50% removal where as it was 90% for PACP filter. PACP filter did not reach to the breakthrough level or exhausted after continuous loading of 35 L of fish wastewater. Filtered PACP filter wastewater was used for rearing tilapia fish and up to the fourth water changing with a 48 hours interval, the fish was in good condition and no death occurred