Utilization of winged bean (Psophocarpus tetragonolobus) seed powder as a coagulant and activated natural zeolite as an adsorbent for improving of tapioca and tofu wastewater qualities

Abstract

Water treatment of tapioka and tofu wastewater was studied. Water treatment was conducted by coagulation process by winged bean (Psophocarpus tetragonolobus) seed powder which was followed by adsorbstion by natural active zeolite. The changing of turbidity, DO and pH during water treatment were investigated. Turbidity of tapioca wastewater which was initially 798 FNU, decreased to 57 FNU. Increasing of tapioca wastewater DO value was obtained from 1.20 to 5.92 ppm. Increasing pH tapioca wastewater was also observed from 5.8 to 6.7. Similar results were obtained for tofu wastewater. Turbidity of tofu wastewater which was initially 680 FNU, decreased to 37 FNU. Increasing of tofu wastewater DO value was obtained from 1.67 to 6.61 ppm. Increasing pH tofu wastewater was also observed from 4.7 to 6.7. Results showed that the improvement qualities of tapioca and tofu wastewater was achieved which meet wastewater quality standard by Minister of Environment of the Republic of Indonesia.