Potential Application of Urea and NPK 15:15:15 Fertilisers as Biostimulants in the Bioremediation of Domestic Wastewater
AMENAGHAWON, N.A, ASEGAME, P.A, OBAHIAGBON, K.O
The role of urea and NPK 15:15:15 fertilisers as biostimulants of microbes in the bioremediation of domestic wastewater was investigated. The samples of domestic wastewater were supplemented with urea, NPK as well as a combination of both fertilisers and the control were monitored for bioremediation indicating parameters such as pH, Biochemical Oxygen Demand (BOD), and Dissolved Oxygen (DO) over a period of 5 weeks. The results obtained showed that there was a reduction in BOD from 120.34 to 16.10 mg/L, 120.34 17.76 mg/L and 120.34 to 15.83 mg/L for wastewater treated with urea, NPK and a combination of both respectively. Stimulation by the fertilisers improved the DO level from an initial value of 0.8 mg/L to 3.4, 3.2 and 3.6 mg/L respectively for wastewater treated with urea, NPK and a combination of both respectively. Generally, the best results were obtained when both fertilisers were used together. The values obtained satisfied the requirements of 6-9, 30mg/L and 2mg/L for pH, BOD and DO set by the Federal Environmental Protection Agency (FEPA). The results obtained indicate the effectiveness ofusing urea and NPK fertilisers for stimulating the activity of microbes for bioremediation.