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For three years after taking over the mine it continued to allow the waste acid to flow into a river.
In industry, such reactions are used many times to neutralize waste acid streams.
Wastewaters include acidic rinse waters together with waste acid.
This will eliminate the disposal of waste acid in the North Sea and significantly reduce discharge to the River Tees.
The reason was that the atmosphere was corrosive, mainly because of waste acid from the sulphuric acid plant, vented to the outside air.
In the reactor the conversion of droplets of preconcentrated waste acid into iron oxide powder and hydrogen chloride gas takes place.
A waste acid recycling plant was completed in Huelva, Spain, in 1992 and a similar project is near completion in Calais, France.
Pickling sludge is the waste product from pickling, and includes acidic rinse waters, metallic salts and waste acid.
Working on a project sponsored by ICI, Holliday and Supple designed a way to treat the 300000 t pa of waste acid generated from methyl methacrylate processing.
At Scarlino, Italy, waste acid is already treated with limestone and lime to produce gypsum and a similar process is near completion at Grimsby, UK.
Here the hillside was at its steepest and the young Agwaine was breathing heavily, his legs began to burn as the body's waste acids settled to the muscles of his calves.
He praises the £66 million sulphuric acid recovery plant at Billingham which, when fully operational, will eliminate waste acid disposal in the North Sea and make a significant improvement to Billingham Beck.