Abstract:
Iron waste or used shot blast, which received from auto parts manufacturing, comprises zero-valent iron (Fe) with can transfer to ferrous iron (Fe²⁺). In this experiment, used shot blast in aeration condition called Fe⁰/air modified Fenton was applied to treat wood adhesives wastewater from lumber mill with contained high organic content (approx. COD of 32,000 mg/L). The optimum conditions were carried out at different time (5-120 min), pH (2.0-4.0), air flow rate (0.5-2.0 L/min), and shot blast dosage (10-40 g/L). The results found that maximum COD removal efficiency from Fe⁰/air modified Fenton reaction at time 60 min., pH 3.0, air flow rate 1.5 L/min, and shot blast 20 g/L was 79.33%. At this condition, treatment efficiencies of turbidity, total suspended solids and BOD were 84.78, 13.28 and 73.68%, respectively. Biodegradability (BOD/COD) increased from 0.08 to 0.11 Even though effluent from this treatment process did not comply with the industrial effluent standard, Fe⁰/air modified Fenton reaction is especially suitable for treating wastewater in the first process in order to reduce burden of wastewater treatment in the next processes.
