Treatment of Waste Water by using Rotating Biological Contactor (RBC)

As the whole world is facing water scarcity due to global warming and other reasons; many cities, nations are running out of water, the only source of water is in the form of precipitation or we can say rainfall. As the world population is growing rapidly, demand of water is also increased. Generally 80-85% of total water supplied is converted into waste water. Due to climatic changes rainfall intensity is not constant and it is not fulfilling requirement of water for the various purpose. And due to excess use of ground water, ground water level is so decreased that around 21 cities including few states in India are likely to run out of water by the year of 2020. To reduce/overcome such water crises, we have to recycle the waste water. Therefore, an attempt has been made in this paper to design the RBC to treat the waste water. RBC has several advantages over the conventional treatment processes like ASP SBR etc. (i.e. Low land requirement, simplicity, low energy requirement, no recirculation of secondary sludge.) This paper focuses on the working of RBC and the efficiency for removing various impurities when the media is 40% immersed in the waste water. For this study, a glass tank of total volume of 270 liter and effective volume of 190 liter is fabricated. 10 HDPE discs as a media were mounted on rotating shaft and the distance between two discs was 50 mm. Media rotates at 10 rpm for 2 hours, after completion of process tests are carried out. Impurities removal efficiency was found more than 80%.