Micro-electrolysis And Combinations Experimental Study On The Integration Process Of Direct Dye Wastewater

Direct dye is the largest production of dyes in the dye industry. Direct dye Wastewater has many features like large water volume, complicated composition, high chromaticity, huge pH change, and poor biochemical characteristics,etc,so its processing is quite difficult treat and they need to pretreat. With the traditional wastewater treatment technologies-such as adsorption method and ozone oxidization method, etc-the treatment of dye wastewater always leads to bad result or the high processing cost, Under this background,researches on economical and effective dye wastewater treatment technology have shown their strong theoretical significance and value of social practice value.Our research is a simulation study for dye wastewater treatment with direct scarlet dye wastewater.Using micro electrolysis technology to deal with direct dye wastewater,our research use chroma removal rate and COD removal rate as the evaluation indexes, We conducted single factor experiment for many times to measure the best condition for micro electrolysis technology treatment of dye wastewater,and after the optimum conditions have been determined,we aim to finally expand the scale of wastewater treatment.Since the treated water may still have color yellow problem, after micro electrolysis technology processing, we suggest using flocculation precipitation and sand filtration technology as advanced treatment process, so as to improve the effect of wastewater treatment.Our research results are as follows:(1) The optimum reaction conditions for dye wastewater treatment using Micro electrolysis technology is:pH 1.2～1.3, iron/carbon ratio 1:1, iron carbon additive amount 45 g/L (waste water); Under this condition, the wastewater chroma removal rate is about 99%, and COD removal rate is about 30%.(2) After dealing with the dye wastewater with micro electrolysis technology, using flocculation precipitation and sand filter processing as in-depth treatment process can raise the water colority and COD removal rate up to 99.8% and 60% respectively; Meanwhile this in-depth treatment can remove 99.9% of the iron out of the water.(3) compared with using micro electrolysis technology solely, combining micro electrolysis technology with flocculation precipitation and sand filter technology to deal with simulated dye wastewater can improve the effect of wastewater treatment and remove the wastewater chroma and COD more effectively.