Studies on the Chemical Parameters of Grey Water Treated by Modified Rotating Biological Contactor (RBC)

In this paper, fundamental concepts of grey water reclamation and reuse are developed that include categories of water reuse and technological innovations for the safe use of reclaimed grey water. In general, grey water contains lower levels of organic matter and nutrients compared to ordinary wastewater; since urine, faeces and toilet are not included. The pilot plant combines biological treatment (RBC) with physico-chemical treatment (filter media that is stone, coal). The treated effluent from RBC was allowed to pass through three columns of filter connected in series. The experiments were run for two different filter media namely, granite stone and coal separately. The experiment was conducted for different influent substrate concentrations and different speeds of rotating blades. Among the different speeds of rotational blades in treating grey water, the rotational speed of 3 rpm was found to yield better reduction of pH, hardness, total dissolved solids, total Kjeldahl nitrogen, dissolved phosphates, total phosphorus, sodium, and boron than the rotational speeds of 4.5 and 6 rpm.