Use of Biomass Fly Ash for Improvement of Surface Water Quality

Abstract

The objective of this research was to study the surface water quality Improvement by biomass fly ash. This study compared the coagulant between alum (industrial grade) with biomass fly ash from power plant. The study of optimum dose, coagulants type and efficiencies. The Jar test was used in a coagulation and flocculation process with 100 RPM for rapid mixing for 3 minutes, then slower to 40 RPM of slow mixing for 30 minutes and settle for 30 minutes. The analysis of characteristic of water before and after process included 5 parameters; total dissolve solids, conductivity, turbidity, temperature and pH. The 6 levels of coagulant concentration changes were 0, 10, 20, 30, 40, and 50 ppm respectively. The results showed that the optimum dose of 2 coagulants gave highest of efficiencies were 20 ppm. The water quality after the process use alum gave a total dissolve solids, conductivity, turbidity, temperature and pH average of 41.10 ± 0.20 mg/L, 82.73 ± 0.12 µs/cm, 6.66 ± 0.04 NTU, 30.00 ± 0.00 ^๐C, and 5.41 ± 0.26 respectively. And water quality after the process use biomass fly ash gave a total dissolve solids, conductivity, turbidity, temperature and pH average of 47.60 ± 0.00 mg/L, 95.83 ± 1.53 µs/cm, 9.31 ± 0.01 NTU, 30.00 ± 0.00 ^๐C, and 6.89 ± 0.25 respectively. The efficiency of turbidity removal uses alum higher than that the biomass fly ash from power plant gave an average of 63.65% and 49.22% respectively.