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Alasag N, Ozer ET, Gucer S:
"Investigation and optimization of some parameters for BOD measurements in textile waste water",
In 4AACD: (Sep 2004)

Keywords
Abstract	The textile industry produces a multi-component waste, which can be difficult to treat. The dyes contained in the eluent can vary daily or even hourly. Textile dye wastewater is well known to contain strong colour, high pH, temperature and COD and low biodegradability especially the effluent from the dyeing stages of the dyeing and finishing process. Azo dyes are the class of dyes most widely used industrially having a world market share of 60-70% (Geisberger, 1997; ETAD, 1998). And also, azo dyes are considered to be toxic to the aquatic biota and are reported to be carcinogenic to humans and the azo linkage present in the dye molecule form carcinogenic breakdown products (Shenai, 1995). The removal of dyes colour is therefore a challenge to both the textile industry and the wastewater-treatment facilities that must treat it. Various treatment methods such as physical, physicochemical, biological and chemical processes have been investigated for treating dye-bearing effluents. Biological treatment is not satisfactory and some pre-treatment physicochemical process was frequently used in many treatment technologies. In our study; BOD measurements were used as a representative case for a biological treatments. The parameters, which influence the BOD measurements, were studied by using chemometric approach. Concentration of phosphate, nitrate and starch in using dyeing process was chosen for central composite design’s factors. The degree of experiments chosen for this study has central composite design of three independent variables. The design is applicable to the critical variables that have been identified and it is preferred because relatively few experimental combinations of the variables are needed to estimate potentially complex response functions. Reactive Black-5 dye was used in these investigations to prepare synthetic textile wastewater. The optimum concentrations of these parameters were tried to find for best biological treatments.
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