4. Conclusion
The result showed that coagulation and neutralization were able to reduce the total suspended solid by 73% and increase the pH by 6. The prototype with 3-stage filtration process was able to reduce the levels of BOD, COD and TSS of the wastewater by 39.34 + 1.61 mg/l; 67.73 + 0.00 mg/l; and 7.20 + 0.23 mg/l, respectively. The prototypes, therefore, has been effectively decrease the levels of the three selected wastewater parameters below the required levels of cajuput oil.