The main aim of recycling is to collect the wastes and clean through a process to reuse. This process can be described in brief during following discussion.
The biological treatment of wastes can be categorized into two main divisions as aerobic and anaerobic treatment. Aerobic and anaerobic treatments are the ways of the biological treatment of wastes. Oxygen-requiring microorganisms are used during an aerobic biological treatment in order to decompose organic and non-metallic constituents into carbon dioxide, water, nitrates, sulfates, simpler organic products, and cellular biomass. Microorganisms are used during an anaerobic biological treatment, in the absence of oxygen, to transform organic constituents and nitrogen-containing compounds into oxygen and methane gas.
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