Production of liquid fertilizer from Tilapia waste for its reutilization

Abstract

The growth of Tilapia production and consumption, along with inefficient and untreated fish waste, is lead to increase the amount of fisheries waste in Vietnam, which urges us to seek for efficient treatment to remove organic load from processing plants. To re-utilize Tilapia waste as a fertilizer, eleven bacteria and fish waste were performed for around 72 h in a 1L seven-neck flask during bioconversion process. By the active biodegradation, removal percentages of CODCr of solid and liquid waste were 72.7 and 61.7%, respectively. The degradation rates of solid and liquid waste were 0.15 and 0.05 g/h. The cell density climbed significantly after 36 h up to 8.7x106 CFU/ml for solid waste and after 24 h up to 3.3x106 CFU/ml for liquid waste. The germination index of cress seeds (Lepidium sativum) of 500 and 1000 folds of solid and liquid waste broth were 70.0 and 82.4%, 60.7 and 73.9%, respectively. The fastest growth of barley for hydroponic culture was achieved at 500-fold dilution broth using solid or liquid waste.