Abstract
BACKGROUND: This study investigated the water and pollution footprints of a dye house, which processed cotton knits, polyester (PES) knits and PES-viscose woven fabrics. Experimental evaluation was carried out for each processing sequence. Variations in wastewater flow and quality were established as a function of the production program in the plant. A model evaluation of wastewater dynamics was performed and defined specifications of an appropriate treatment scheme. RESULTS: The plant was operated with a capacity of 4300 t year −1 of fabric, which generated a wastewater flow of 403 500 m 3 year −1 and a COD load of 675 t year −1 . The overall wastewater footprint of the plant was computed as 91 m 3 t −1 and the COD footprint as 160 kg t −1 of fabric. Depending on the fabric type, results indicated expected changes in wastewater flow between 600 and 1750 m 3 day −1 ; in COD load between 1470 and 2260 kg day −1 and in COD concentration between 1290 and 3400 mg L −1 . CONCLUSION: A model simulation structured upon COD fractionation and related process kinetics revealed partial removal of slowly biodegradable COD, coupled with high residual COD, which would by-pass treatment. Resulting biodegradation characteristics necessitated an extended aeration system, which could also enable partial breakdown of residual COD. Effluent COD could be reduced to 220–320 mg L −1 with this wastewater management strategy.
| Original language | English |
|---|---|
| Pages (from-to) | 1330-1340 |
| Number of pages | 11 |
| Journal | Journal of Chemical Technology and Biotechnology |
| Volume | 94 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Apr 2019 |
Bibliographical note
Publisher Copyright:© 2018 Society of Chemical Industry
Keywords
- COD footprint
- modeling
- textile dyeing
- treatment optimization
- wastewater footprint
