The selection of appropriate low-cost natural materials for textile wastewater treatment in constructed wetlands
Fakin, Darinka ; Ojstršek, Alenka
This paper studies the treatment efficiency of a vertical-flow constructed wetland model, which contains two different combinations of low-cost natural materials for the purification of textile ...dyebath wastewaters. Preliminary, chemical and structural aspects of sand, natural zeolite and peat were evaluated using scanning electron microscopy and mid-infrared spectroscopy, and the adsorption kinetic of two structurally different dyes on peat and zeolite was studied. Additionally, the experimental part was conducted in a CWmodel on two laboratory prepared dye-bath wastewaters, containing two commercial reactive dyestuffs, different chemicals and auxiliaries. The obtained results indicate that the constructed wetland model offers a wide spectrum of natural processes that serve to reduce dye concentration (up to 70%), TOC and COD values (up to 88%), electrical conductivity (60%) and pH values (from 12 to 7.6), depending on the combination of materials, contact time and initial dye-baths composition (different dyestuffs).
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