Abstract:
The objective of this research is to study the optimum conditions of coolant oil treatment from auto parts manufacturing with modified Fenton reaction by reused iron dust from shot blast process and aluminium dross from casting process of auto parts manufacturing. The wastewater treatment experiment was conducted in range of reaction time 5-180 minutes, initial pH 3-5, hydrogen peroxide dose 0.5-1.5 ml, shot blast dose 0.25-3.5 g and aluminium dross dose 0.25-2 g. The optimum condition was mainly considered in COD removal efficiency and subsequently removal efficiency of other parameters such as BOD, and TSS. The results showed that optimum condition in this study were 60-minute reaction time, initial pH at 3, 1 ml of hydrogen peroxide, 2.5 g of shot blast, and 1 g of aluminium dross in 50 ml for coolant oil wastewater treatment. Furthermore, removal efficiency of COD, BOD, and TSS under this condition of modified Fenton process was 47.31, 53.34 and 74.96 %, respectively. Thus, sludge from modified Fenton treatment could be reused as Fenton catalyst one more time with almost no different in COD removal efficiency. Furthermore, result from comparison of modified Fenton and conventional Fenton showed that modified Fenton provided 28 % higher efficiency of COD removal than another and require less operating cost than conventional Fenton about 340 THB/m3