Two other competing systems, pre-treatment by a nuclear waste technology firm Kurion and fine removal by energy conglomerate Areva, cleaned the other four.
Kasuri said Sunday that foreign intelligence had years ago passed on information about Khan giving nuclear technology to other countries -- prompting his removal in 2001 as head of the Khan Research Laboratories, the main nuclear lab named after him.
The Department of Energy and Climate Change said the development of CCS technology, if developed at scale, could allow the safe removal and storage of harmful carbon emissions from coal and gas plants.