The effect of nozzle size on dissolved oxygen value using fine bubble aeration. Case study: Leachate treatment in Manggar landfill

Abstract

Leachate is a concentrated liquid that is harmful to soil and groundwater. This liquid comes from the process of decomposition of waste material by microorganisms in landfills. Leachate has the characteristics of high organic content. To reduce the organic content, one of them is to increase the dissolved oxygen in leachate. The method used with the aeration diffuses. Especially, using fine bubble aeration. Based on this background, a leachate water treatment was carried out using the fine bubble aeration system in order to see the effect on the value of dissolved oxygen or DO produced. The method in this experiment using a closed reactor system by varying nozzle diameter as a control variable. They are 1.5 mm, 2 mm and 3 mm. The air pressure use 3 bar. Aeration time from 0 to 120 minutes. The volume of water as much as 25 Litre. The results showed that there was an effect of nozzle size on DO values. The highest increase in DO occurred in 1.5 mm diameter reaching 7.4 mg/L, while the highest 2 mm and 3 mm DO sizes reached 6.6 mg/L and 6.6 mg/L respectively. Based on the comparison of DO values of each diameter, it can be concluded that the 1.5 mm is more effective in increasing the dissolved oxygen concentration in leachate water treatment using fine bubble aeration. According to bivariate analysis, the nozzle diameter as a control variable has a very strong relationship with the DO value indicated by the correlation value approaching 1 (0.701) with the aeration time change scenario.