Utilization of Cowpea Seeds (<i>Vigna Unguiculata L.</i>) Compare to Poly Aluminium Chloride (PAC) in the Coagulation-Floculation Process of Peat Water

Peat water has special characteristics, namely brownish color, high organic matter and high ferric content. It requires a treatment before it can be used for daily needs. The water treatment used in this research was coagulation-flocculation with Cowpea seeds and PAC as coagulants. The coagulation method aims to destabilize particles so that they can be combined with other particles to form larger aggregates and able to settle down. The purpose of this study was to determine the efficiency of using Cowpea seeds for removing organic matter and color in peat water, to evaluate the sludge volume index (SVI) and sludge mass and then to compare the results of using cowpea seeds with PAC as coagulants. In this study, Cowpea seeds can remove 91% of organic substance, 94.85% of color, has 38.29mL/g of SVI value and 98.26% of sludge mass. Meanwhile, PAC can remove 98.67% of organic, 98.26% of color, has 129.55mL/g of SVI value and 118.14% of sludge mass. The results of this study shows that Cowpea seeds have almost the same ability as PAC to be a coagulant but the dose is high. Cowpea seeds dose is more than 14 times of PAC dose. .