EVALUATION OF A REED BED SYSTEM AS A TERTIARY TREATMENT OF COFFEE PROCESSING WASTEWATER (CPWW)M. SELVAMURUGAN, N.B. NANDAKUMAR, M. MAHESWARI AND P. DORAISAMYAbstract Coffee processing industry is one of the major small-scale sectors in India. Coffee fruits are processed by two methods viz., wet and dry process. In wet processing, coffee fruits generate enormous quantities of high strength wastewater requiring systematic treatment prior to disposal. The present study attempts to assess the effect of reed bed system as tertiary treatment of biomethanated and aerated CPWW by sub surface flow (SSF) with two local reed plants viz., Typha latifolia and Colacasia sp. The raw CPWW, biomethanated CPWW and biomethanated cum aerated CPWW were used as influent. The maximum BOD, COD and TS removal efficiency of 85.4 per cent, 78.3 per cent and 57.0 per cent, respectively were recorded in biomethanated, aerated and reed bed treated CPWW. The finding of the study indicated the efficiency of reed bed system in treating wastewater as tertiary treatment of previously treated coffee processing wastewater by a combined Upflow Anaerobic Hybrid Reactor (UAHR) and mechanical aeration.
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