Cascal NV - Yanjiao, China

History - Located in the Heibei Province on the bank of Chaobai River, Yanjiao Economic & Technological Development Zone (ETDZ) faces Beijing across the river. It is 30 kilometers east of Tianamen Square and lies in the hinterland of the “Golden Triangle” between Beijing, Tianjin and Tangshan.

In late 1999, the Yanjiao ETDZ was ratified as a provincial level high-tech industrial zone. Since then it has developed rapidly and has now become a new satellite town of Beijing. The zone covers an area of more than 30km² and integrates science and technology with manufacturing, tourism, finance and commercial activities. It has attracted more than 10 countries of investors from USA, Canada, Germany, Japan, Korea, Taiwan and Hong Kong, etc. with total capital investment of USD 600 million.

Partnership - The water supply system comprises borehole raw water extraction, chlorination, treated water storage and pumping.

The water treatment and supply facilities have been constructed in two phases and currently have a maximum output of 60Mld. The first and smaller phase involved renovation of an existing 20Mld water treatment works. This is currently only operated once a month to ensure it functions correctly and is maintained purely as a standby plant.

Developments - The second and larger phase required the construction of a new 40Mld water treatment works. Both plants are fed from three borehole sites comprising a total of 20 wells up to 300 meters deep, approximately 10 kilometres from the facilities. The operating level of the pumps is approximately 22 metres below ground, which is to ensure reliable and sustainable supply of high quality water.

The second phase treatment plant comprises:
Two 4000m³ treated water storage tanks
High lift pumping
A chlorine dosing plant comprising a drum store with an adjacent emergency neutralization system
Two duty, one stand-by chlorinators
Associated control systems to run the plant.
This plant was officially opened in August 2003.

The Yanjiao CWC has ISO9001 accreditation covering the operation of the facilities.