Chromium is used as tanning agent to harden animal hides in leather industries.
The green panel also sought total number of leather units operating at the tannery hub at Jajmau in Kanpur including closed ones in order to ascertain their functioning and quantity of effluent discharged.
"We direct tanneries to take clear instructions as to why they be not asked to shift to a planned industrial complex with complete infrastructure and also inform the tribunal how many tanneries are there in Jajmau in Kanpur and how many are lying closed.
During the proceedings, Vinod Tare, a professor of IIT Kanpur, was present who told the bench that the first report on Ganga was submitted in 2010 by a consortium of the seven Indian Institutes of Technology of Bombay, Delhi, Madras, Kanpur, Kharagpur, Guwahati and Roorkee.
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He said consortium of the seven IITs had concluded that failure of Ganga Action Plan-I was due to multiplicity of authorities and lack of data collection.
The tribunal has now fixed the matter for hearing on December 1.
The tribunal had earlier slammed the Uttar Pradesh government over the issue of shifting of tanneries located on the banks of Ganga in Kanpur to some other place to stop discharge of effluents, saying, "it can't behave like a king".
On November 15, the tribunal had stopped the government from spending "a single penny" for Ganga rejuvenation work between Haridwar and Unnao, saying a whopping Rs 20,000 crore was being spent on the entire national project by officials who did not even know about the river.
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