Hangzhou, the capital of Zhejiang Province, is one of the most famous tourist destinations in China. The West Lake Scenic Area in Hangzhou was selected as a World Heritage Site by UNESCO in 2011. Therefore, West Lake is also known as China's paradise, the business card of Hangzhou.
Every day, 300,000 cubic meters of living water from the Qiantang River is replenished to the West Lake. The supplemented water is first treated by physical and chemical methods (coagulation-flocculation-precipitation) and then input into the West Lake. However, according to China's four types of surface water standards, the nitrate nitrogen in the raw water exceeds the standard, so it needs to be treated by a Biostyr® denitrification biological filter.
