Erina Rahmadyanti, Agus Wiyono, Nurhayati Aritonang
Wastewater on coffee processing contains high BOD, COD, TSS, NH4 +-N, and TP but low pH. Overall, these effluents did not meet the standard for discharged effluent in accordance with the East Java Province Regulation No. 72 of 2013. This research aims to determine the effectivity of the combination between Moringa oleifera seeds as a natural coagulant in flocculation coagulation unit and vertical subsurface flow constructed wetland to treat the wastewater on coffee processing. Adding Moringa oleifera seeds powder of 100 mg/L on vertical subsurface flow constructed wetland with retention time for 8 days was proven effectively to produce pH parameter content close to neutral or 6.65 ± 0.04, reduce TSS to 99.63 ± 0.10%, COD to 98.06 ± 0.04%, and BOD to 97.67 ± 0.24%. Thus, it would be safely discharged off in the waterbody. However, for NH4 +-N and TP contents, the discharged effluents still have not met the standard set as both increased up to 8.16 ± 0.02% for NH4 +-N and 11.47 ± 0.11% for TP with the retention time of 8 days. Further researches are necessary to be conducted in order to reduce both NH4 +-N and TP contents on the wastewater on coffee processing. © 2020 School of Engineering.
Departement of Civil Engineering, Universitas Negeri Surabaya, Kampus Ketintang, Jalan Ketintang, Surabaya, East Java, 60231, Indonesia
