3.6. Experiment of the Treated Effluent for Reuse

The treated wastewater was used in dyeing and finishing experiments on the industrial scale by means of three dyeing machines in the workshop. The dye bath has been prepared according to a dye recipe. Preweighed dye and fresh-water soaked knitted cotton fabric were introduced into the cold dye bath. The dye bath temperature was gradually elevated to boiling and maintained for about 1.5 h, the water level in the dye bath has been maintained during the dyeing processing. The dyed fabric was rinsed three times with recycled water and dried under the shade, then subjected for dye uptake studies. The dye uptake of the fabric was measured using a spectrophotometer.