engleski

Study Of Purifying Textile Waste Water In Wetland System

Auto purification processes occurring in nature are the model for building fabricated Wetland systems for water purification purposes. These processes are known to be most efficient, especially if time of purification lasts at least 50 days. In this time, water is being purified by various filtration, adsorption, physical, chemical and biological processes. Textile wastewaters are heavily burdened by dyestuff, various additives and salt, usually NaCl, which is used as electrolyte in cotton dyeing processes. This paper suggests establishing a nature-like Wetland system using gravel and sawdust for treatment media building and geotextile as filter. In this abstract SAC values (special absorption coefficient - determination of the intensity of color) and wetland system’ s salt adsorption capacity as water quality indicators were presented. Parameters such as dyestuff group (reactive and metal-complex ; dye concentration 0, 5 g/l) as well as salt concentration (10– 50 g/l) were investigated. The downside of selected purifying system is low adsorption property for reactive dyestuff, while the results obtained for metal-complex dyestuff show great discoloration. Wetland system’ s salt adsorption capacity was calculated based on functional dependence of conductivity on electrolyte concentration, k=f(c), and the derived mathematical function was: κ =1, 5363⋅ c + 3, 3605, obtained correlation coefficient R2 = 0, 9956. According to overall added 150 g of electrolytes per liter, selected Wetland adsorption system showed outstanding capacity of 90 g/l. Regarding the correlation between salt amount and conductivity, defined by derived mathematical function, applicability of selected Wetland system, containing geotextile, gravel and sawdust, for removing dye-house wastewaters burdened by large amounts of salt is confirmed. Selected adsorbents show greater adsorption properties for metal-complex dyestuff, when compared to reactive dyestuff, which is best seen in SAC values obtained after Wetland system rinsing. This is the result of chemical structure and molecule size.

textile waste water; constructed wetland

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