Abstract:
In this research, the experimental equipment has been set up to use for final waste water process before discharge to public drainage. The system consist of continuous Micro Filtration at the beginning and Reverse Osmosis at the final state. The purpose of this research is to study the optimum value of the process including the parameter and changes in long run, the economics value from using product water in another application including possibility to save water resource and supporting of environmental activities. At the research, waste water containing high Suspended Solid and Silica will feed to Continuous Micro Filtration system and found that the Suspended Solid can be rejected 100% at all level of pressure while Silica can be rejected only 4.27% at this system, but at Reverse Osmosis system Silica can be rejected 97.5%. At Continuous Micro Filtration system, by adjusting pressure between 0.2-0.8 bar, at higher pressure water flux will be increased and at pressure of 0.4 bar will give the highest % of salt rejection. For Iron which is contain only 0.03 ppm as Fe, the system can be rejected 100% at all level of pressure. At Reverse Osmosis system, by adjusting pressure between 8-17 bars, at higher pressure water flux will be increased and at pressure between 11-14 bars will give the highest % of salt rejection. By adjusting % recovery between 40-60% will give high % of salt rejection. But when adjust to 70%, the % of salt rejection will be reduce. And as running the system in long term and collect the data during 8-240 hours at pressure of 11 bars and % recovery 60%, the % of salt rejection is running between 98.67-98.81%. Furthermore, the quality of water from this process can be applied to use with Cooling Tower which can reduce the water use at blow down process from 220 M3 per day down to 90-100 M3 per day and as studying economic value found that chemicals use to prevent the corrosion and scale in Cooling water system can be reduced by 33% or pay back within 3 years.