Wastewaters
resulted in the dye finishing industry have high BOD to COD values
(>2000 mgO2 L−1) while the discharge limits [2,3] are much lower
(BOD < 40 mgO2 L−1; COD < 120 mgO2 L−1), indicating the need for
wastewater treatment, because most of the dyes are slowly or nonbiodegradable.