Author/Editor     Bulc, Tjaša G; Ojstršek, Alenka; Vrhovšek, Danijel
Title     The use of constructed wetland for textile wastewater treatment
Type     članek
Source     In: 10th international conference on Wetland systems for water pollution control. Vol 3; 2006 Sep 23-29; Lisbon. Lisbon: International water association,
Publication year     2006
Volume     str. 1667-75
Language     eng
Abstract     Textile effluents represent severe environmental problems as they contain various chemicals, auxiliaries and dyestuffs. The paper studies the treatment efficiency of a constructed wetland (CW) model and a pilot CW for the purification of coloured textile wastewater. Experiments were conducted using three commercial dyes, NaOH, NaCI and auxiliaries. The trials weee performed in the CW model containing gravel, sand, and zeolite. The purifying efficiency was verified by measuring the parameters such as absorbance (A), pH, TOC, and COD. The colour was reduced up to 70%, COD and TOC values up to 45%. Based on these results, the pilot CW with vertical and horizontal flow was constructed to treat textile wastewater. It was designed for 1 m3/d, covering 80 mZ and planted with Phragmites australis. The average efficiency of the CW for the following parameters were: COD 77%, BOD5 57%, TOC 84%, Ntotal 5%, Norganic 77%, NH4-N -954%, sulphate 62%, anion tenzides 87%, suspended solids 83%, and colour reduction on average 85 % respectively. The obtained results indicated that the purifying efficiency depended on the retention time, the composition of coloured textile wastewater and the design of the system. The results proved that the combination of CW with biological filter could offer optimal solution to meet the requirements.
Descriptors     FRESH WATER
WATER POLLUTANTS
TEXTILE INDUSTRY
WATER PURIFICATION
PLANTS