Influence of powdered Moringa oleifera seeds and natural filter media on the characteristics of tapioca starch wastewater

Background: Moringa oleifera tree is indigenous and highly abundant in Indonesia and its seeds are widely knownto be used as a natural coagulant for treating wastewater. Wastewater from tapioca starch industry, particularly inIndonesia, which contains high organic matters, was revealed by high biochemical oxygen demand (BOD) andchemical oxygen demand (COD) value. In this study the combination of powdered M. oleifera seed and natural filtermedia was studied. A laboratory scale of tapioca starch wastewater (TSW) treatment was designed using acontinuous two-stage clarifier tanks filled with sand or coconut fibre combined with the addition of powdered M.oleifera seed.Results: A significant improvement on both the physical and chemical characteristics of the effluent quality,showing a clearer colour and a greater reduction in BOD, COD and total suspended solid values; while pH was inthe acceptable range for effluent disposal. In terms of the microbial characteristics, all treatments gave slightlyhigher counts of total coliform in the range of 26 to 40 MPN 100 ml−1.Conclusions: The combination of two-stage clarifier tank with natural filter media and the use of M. oleifera asnatural coagulant gave a significant improvement in the quality and appearance of TSW final effluent.

Keywords:

Tapioca starch wastewater , Natural coagulant , Moringa oleifera seed , Natural filters , Total coliform