BIOLOGICAL TREATMENT OF TANNERY WASTEWATER PRE-TREATED BY COAGULATION USING Moringua oleifera AS ...

The biological digestion of tannery effluent and coagulation with Moringa oleifera (MO) seed powder were explored. At free pH, coagulation removed at least 43.5 percent of COD, 65 percent of suspended particles (SS), and 95.2 percent of chromium (1 g MO in 300 mL of Raw Wastewater). The pH and conductivity are unaffected by MO seed powder as a natural coagulant. Following biological treatment, original samples and coagulation supernatants were kept for a maximum of 2 days (aerobic digestion) and 20 days (aerobic digestion) (anaerobic digestion). Aerobic treatment of pretreated wastewater with MO seeds powder reduced 95.2 percent of COD. During 20 days and 16 days of operation, anaerobic treatment provided approximately 463.5 mL and 310 mL of biogas, respectively, equating to nearly 0.259 biogas/g COD removed and 0.264 L biogas/g COD removed for sludge and supernatant obtained following raw wastewater treatment with MO. These findings could lead to lower tannery wastewater disposal costs.

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