The Utilization of Laundry Wastewater as Liquid Fertilizer for Rice Plants

Abstract The laundry liquid wastewater contains detergents and phosphates which are nutrients for plant which can also causepollution, explosive growth of aquatic biota, and aquatic ecosystems eutrophication. The great potential of laundrywaste requires an efficient and inexpensive waste treatment model to reduce the phosphate content. This study aimsto examine the effect of wetlands on laundry wastewater, straw soaking water, and the use of effluent as a liquidfertilizer for rice plants. As well as analyzing the fate of toxic detergents (ABS) in rice grains on a laboratory scale.The results showed the wetland was able to reduce the pollutants level in laundry wastewater and toxic organic bondswith the BOD, COD, TSS, TDS, Detergent, Phosphate reduction efficiency between 49% - 95%; has met the PERDADIY no. 7 of 2016 about Quality Standard. The operating conditions that provided the optimum results in this studywere the laundry wastewater treatment model and the utilization of effluent as liquid fertilizer for rice plants withstraw soaking water neutralization with minimum discharge variations resulting in effluent quality and quantity ofharvested products of 75 gr/0.4 m2 and there is a detergent residue content of 24.80 mg/kg; without straw soaking,yields 155 gr/0.4 m2 with detergent residue content of 32.65 mg/kg. Iconic and diagrammatic models of laundrywastewater treatment were obtained based on the quality variable, quantity variable, and the effluent pre-treatmentcapacity variable thus it can be used as liquid fertilizer for rice plants to describe the behavior of the real system. Thefactor that has a high influence on system performance, but the dependence between factors is low, namely the effluent flow discharge into the wetland.