Effects of Melanoidins on the Efficiency of Anaerobic Digestion
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Abstract
Melanoidins are dark brown to black substances formed from the condensation of glucose and amino groups, produced through non-enzymatic browning reactions. These melanoidins are predominantly found in wastewater from industries involving fermentation and distillation processes that use molasses as a raw material. These industries commonly use anaerobic digestion systems for primary treatment to reduce organic compounds in the wastewater, producing biogas as a byproduct that can be utilized as a renewable energy source. However, excessive amounts of melanoidins can negatively impact the microorganisms that produce volatile fatty acids (VFA), leading to a decrease in these acids and consequently reducing biogas production. Therefore, it is necessary to control the concentration of melanoidins to maintain optimal system efficiency.Studies assessing the toxicity of melanoidins have shown that at a concentration of 10,000 mg/l, melanoidins have a maximum biogas production potential of 0.162 l/kg CODremove, with an 80% COD removal efficiency. When the concentration of melanoidins exceeds 10,000 mg/l, biogas production decreases due to the inhibitory effects of melanoidins on the growth of microorganisms essential for biogas production.
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