SLUDGE DEWATERING FROM WWTP USING NATURAL COAGULANT - MORINGA OLEIFERA EXTRACT
Gustavo Eiji Higawa
Joseane Débora P. Theodoro
Ramiro José Espinheira Martins
The global water crisis, caused by a growing population and increased water consumption, is exacerbated by the escalating production of wastewater. Wastewater treatment is necessary to address this problem, but it results in the production of sludge, which poses environmental and health risks. Dewatering of sludge is a crucial aspect of treatment, and coagulants can enhance this process. Moringa oleifera seeds, or MO, offer a low-cost and environmentally friendly alternative as a coagulant. MO seeds were processed by removing their shells, crushing them, and drying them at 45°C for 24 hours to extract the active coagulant. The active coagulant components were extracted using a NaCl solution (10 % m/v) in two ways: one with ordinary agitation (MOC) and the other with ultrasound assistance (MOC-U), both of which were filtered to remove undissolved particles. The sludge was conditioned with different coagulant dosages using a jar test with fixed rapid and slow mix configurations.