| dc.description.abstract | Textile wastewater from wet processing units is a major environmental problem. Most chemicals,
including dyes, are only partly consumed, resulting in highly colored wastewater containing a variety
of chemicals released into the environment. This paper gives information on the current
management of textile wastewater in Tanzania. A semiquantitative analysis was done to identify the
main types of chemicals used in wet processing units, wastewater characteristics and existing
wastewater treatment methods in the textile industry. The performance evaluation of the existing
wastewater treatment plants is also discussed. The advantages of integrating constructed wetlands
with the existing treatment facilities for textile wastewater are explained. It has been observed that
pretreatment and dying/printing of the fabrics are the main two processes that produce wastewater
in many textile companies. Main pollutants are chemicals used from pretreatment and materials
removed from de-sizing, bleaching and scouring processes. Dyes, printing pigments and dye
auxiliaries are the main pollutants from the dyeing/printing process. Most of the textile companies in
Tanzania are equipped with effluent treatment plants. Wastewater treatment plants have basically
similar units, which are coagulation-flocculation, sedimentation through clarifiers and aerobic
reactor. However, their effluents do not meet discharge limits stipulated by the Tanzania Bureau of
Standards (TBS). | en_US |
