In 2015, zhile environment invested more than 70 million yuan to undertake the BOT project of the surface water plant of the south-to-north water diversion project in wangdu county, with a daily water treatment capacity of 25,000 square meters and an area of 15 mu. The project has been franchised for 30 years. It is the first surface water plant that adopts imported ultrafiltration membrane technology, which ensures the safety of residential water and improves the standard of residential water. The project was officially opened to water in August 2017 and is fully automated.