Mercury Pollution - Anshun Site

History of the Site

An alkaline chlorine plant was built in 1940 and closed in 1982, in an area covering almost 40 hectares. After a long and complicated litigation and transfer of property rights, the Environmental Protection Agency of Taiwan requested the landowner/owner to carry out remediation in 2009.

Contamination in figures

Over 400,000 tonnes of soil and sediments were contaminated, with total mercury contamination estimated at up to 40 tonnes.
The entire area can be divided into four contaminated areas, including a pond that requires drainage, where mercury was detected at a maximum concentration of nearly 10,000 mg/kg (soil control standard of 20 mg/kg).

Apollo Technology Added Value

A successful site remediation depends not only on the concentration of different contaminants, but also on the soil characteristics.
When thermal treatment is chosen as the primary treatment technology, soil cleaning, which can treat several contaminants, can be used as an additional technology, which is often cost-effective when the two technologies are combined.

The soil cleaning technology, which combines physical and chemical cleaning, was then used as a pre-treatment contamination reduction technology and was installed on site on a plant scale.

Note: the photo for the banner is a courtesy of CPDC