Nema is cracking down on
effluent discharge and banned plastic bags countrywide.
Synthetic dyes
effluent was prepared by mixing hydrolysed reactive dyes (Reactive Black 15 (139 mg/L); Reactive Yellow C-4 GL (150 mg/L); Reactive Red C-4 BL (1215 mg/L), hydrolysed starch (13.9 mg/L), Na2SO4 (27.8 mg/L) and Na2HPO4 (27.8 mg/L) in de-ionized water.
In Jajmau, 36 MLD common
effluent treatment plant exists, out of which 9 MLD is dedicated to treating the
effluent coming from tanneries.
He said that work was also on to install combined
effluent treatment plants at different industrial zones of Karachi with support of federal government.
In a previous hearing, the commission was informed that the industries had processed their cases for the installation of
effluent treatment plants through a firm, Technology Provider, and they would complete the assignment within the timeline agreed between the parties.
Electrochemical technology has been granted as most effective and economical method for the removal of major chemical components found in textile
effluent. The introduction of this new electrochemical treatment is a significant addition to the existing technologies being used fot this purpose.
Shujauddin Siddiqui (Leather Expert) elaborated chromium management in the tanneries, which causes environmental pollution and presented the ways by which
Effluent of chrome is re-usable.
The main pollutants in
effluent are high suspended solids, Chemical Oxygen Demand (COD), heat colure, acidity and other soluble substance.
During the past several hearings, the judicial commission has been warning the industrial units that they would be sealed if they do not install
effluent treatment system within the stipulated time.
Earlier, amicus curie Ayesha Hamid advocate submitted a report regarding the disposal of the
effluent. She was tasked by the court on January 20 to prepare a report on disposal of
effluent in five big cities, including Lahore, Faisalabad and Multan.
Two waste waters from a textile dyeing process were employed in the decolorization tests:(i) the
effluent produced from the washing of the dyed material, called the residual dye bath
effluent (RDB), and (ii) the final
effluent (FE) collected at the end of the primary physicochemical treatment and prior to biological treatment in the treatment plant.
