2015 : Rough and Splitted on the Surface of Disk in Rotating Biological Contactor to Treat Tempe Wastewater

Prof. Ir. Joni Hermana M.Sc.ES., Ph.D.


Abstract

Wastewater of tempe is derived from the water used to wash and boil the soybean. This wastewater usually contains of high organic and nitrate matter. Therefore, it needs appropriate treatment system to reduce the content of wastewater. This research was aimed to develop a design for rough and splitted on the surface of discs as contactor in RBC. The method employed was to vary the parameter of Chemical Oxygen Demand (COD) and Total Suspended Solid (TSS). Then, rotor rotation was set in 7 rpm, and 40% disc was immersed into wastewater with a temperature around 27ºC-29 ºC; while the used pH was beween 6.52–7.84, neutral pH. The treatment would significantly remove the COD was varied 85.17% to 93.27%, the TSS removal ranged from 29.9% to 67.44% and nitrate removel range from 36.25% to 57%. Hydraulic retention time (HRT) in this process was varied from 3.5 to 4.2 hours, while the organic loading was varied from 11.91 to 43.18 gCOD/m2day. The identified bacteria dominantly grow in biofilm and were able to degrade the organic loads, Bacillus sp. and Pseudomonas sp.