The 14 Sewage Treatment Plants (STPs) operated by Ahmedabad Municipal Corporation (AMC) have been functioning more efficiently since the Gujarat high court intervened to stop pollution in the Sabarmati. The STPs have been meeting up to 95% of wastewater treatment parameters.
When the high court took suo motu cognizance of the malfunctioning of Pirana STP in August 2021, resulting in the release of improperly treated water into the river, all 14 STPs were reported to be in poor condition.
On the direction of the court, one of the main reasons behind the rapid corrosion of the STPs was found to be the illegal discharge of trade effluents into AMC’s sewage system.
Experts told the court that STPs are not equipped and meant to treat trade effluents. In addition to corroding the STPs, mixing industrial waste and sewage had adversely affected their efficiency, resulting in the discharge of polluted water into the Sabarmati.
The High Court ordered the AMC and the Gujarat Pollution Control Board (GPCB) to cut off illicit drainage connections of industrial units that were discharging trade effluents into sewage right away.
Across the city, the authorities severed 393 drainage connections of industries through an aggressive disconnect drive. They even severed the drainage connections of textile units that released treated effluents into sewage network.
The functioning of STPs has been monitored regularly since August. Almost 95% of the parameters from these STPs have improved since January, indicating improved quality from these plants.
The results obtained in January on four occasions revealed that the Vastrapur Lake STP and Vastral STP released treated water with PH limits that exceeded permissible levels. The STP at VS Hospital defaulted two-times on this count. The level of suspended solids found in outflow from all STPs were within parameters for nine STPs.
The TDS levels in treated water were also within permissible limits. The discharge at Vasna STP was once found to have Biochemical Oxygen Demand (BOD) above permissible limits and Chemical Oxygen Demand (COD) higher than the standard parameters.
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