NITROGEN REMOVAL OF TEXTILE WASTEWATER BY COMBINED ANAEROBIC-AEROBIC SYSTEM
Keywords:
Anaerobic, aerobic, cosmoball, nitrification, denitrificationAbstract
The discharges of textile wastewater containing nitrogen to the environment are undesirable because these nutrients accelerate eutrophication. Further problems occur because certain forms of nitrogen (ammonia, nitrite, and nitrate) are toxic to aquatic life or may lead to diseases in those who drink water contaminated with these compounds. A combined anaerobic-aerobic system was operated continuously for the treatment of textile wastewater. Cosmo balls were used to function as growth media for microorganisms in an anaerobic reactor, and activated carbon in the aerobic one. Effect of pH, dissolved oxygen, and organic changes in nitrification and denitrification processes was investigated. The results indicated that 85% ammonia nitrogen, 80%COD, and 65%BOD removal efficiencies could be obtained. Dissolved oxygen, pH were shown to have only slight influences on the nitrification process.
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