Biological degradation of organic matter
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Which organic compounds are difficult to decompose during oxygen-consuming biochemical degradation, or may cause damage to microorganisms, thus making anaerobic conditions necessary? For example, can toluene and xylene be harmful to bacteria, and what is the appropriate concentration?
For the aerobic biological treatment of wastewater, the theoretically allowable concentrations are: benzene 100 mg/L, phenol 100 mg/L.
Of course, benzene and xylene are difficult to degrade and toxic; in addition, there are organic pesticides, organic dyes in printing and dyeing wastewater, lignin in papermaking wastewater, chemical fiber wastewater, chlorobenzene, nitrochlorobenzene, and many other substances! ! ! These wastewater streams are generally treated using anaerobic processes. As for the appropriate concentration, it depends on various water quality conditions as well as the types of microorganisms present in different areas, and it can be determined through laboratory tests.