Effect Of Heavy Metals (Cd And Cu) On Biomethane Production (Bmp) From Poultry Waste.

Biogas can be produced from poultry waste through anaerobic digestion, which involves a cycle of integrated physiological and metabolic processes carried out by microorganisms.However, a lack of trace elements and an excess of heavy metals have been identified as key factors limiting the widespread use of this process.This study aims to examine the impact of heavy metals, specifically cadmium (Cd) and copper (Cu), on the anaerobic digestion of poultry waste for biogas production.Two reactors were set up: R1 and R2, which were used to assess the effects of Cd and Cu, respectively, on biogas generation over a 10-day period.The results were compared with a control reactor (R3) that had no metal addition.The findings showed that a Cd accumulation of 0.25 mg reduced system efficiency by 86%, and at 0.57 mg accumulation, the system failed entirely.A Cu accumulation of 0.17 mg reduced efficiency by 84%, with a complete breakdown of the system at 0.34 mg of Cu.In the control reactor, biogas production increased over time, starting with an initial yield of 51.4 ml on the 4th day.The consistent methane production in the control reactor was due to the absence of heavy metal accumulation, which did not interfere with the digestion process.The study concluded that increasing levels of heavy metal accumulation reduced system efficiency and biogas yield.