When the oxygen in the garbage is exhausted then the decomposition to anaerobic decomposition. During this period, nitrate and sulfate are often reduced to nitrogen gas N2 and H2S. When the redox reduction, bacterial communities performs the process of hydrolysis and convert high molecular compounds (polysaccharides, lipids, proteins, nucleic acids) due to the intermediary enzymes into simpler compounds suitable for micro-organisms. We will this content simple substances such as nutrients, carbon and energy source for our cells. During this period the pH of water leakage will decrease due to the formation of organic acids and effects of the increasing CO2 concentration in the landfill.
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