The sedimentation process a simple method to diminish contaminants in textile effluents

The textile industry is considered one of the most polluting because it uses large amounts of chemical compounds and water. We analyzed the micro and small textile firms from Tepetitla of Lardizábal in Tlaxcala, engaged in the textile finishing of jeans. The most common processes are washing, softening, rinse, stone and yeing. The analysis of the wastewaters from the different process did not match with the parameters. established. At the NOM-002-ECOL-1996. Those from dyeing had the higher values in electric conductivity because of the sodium chlorine used. We observed that, except for dyeing, the sedimentation as a pretreatment is a viable and economic option to diminish the color and COD until 70% in a simple way, besides the pre-treated water can be recycled or reused in another process which could use not clean water. The phytotoxicity assay showed that the effluents from dye process were highly phytotoxic, those from rinse and softening process were phytotoxic, and those from washing and stone process were no phytotoxic.