The Deyang area in southwest China was struck hard by an earthquake in 2008. Since then, reconstruction has taken place with a tremendous speed and the urban population grew exponentially. Due to this urbanisation, the city’s water supply system can not meet its rapidly growing water demand.
Currently, two-thirds of all Chinese cities don’t have sufficient water the whole year round. On top of that cities suffer from severe water pollution caused by rapid development. Water scarcity and water pollution cause a loss of 11.2 billion USD in industrial output every year. The cost of the impact of insufficient water quality on health has been estimated at 3.9 billion USD per year.
In Deyang, a pilot artificial recharge water supply system was developed and tested. This system benefits from the technology as introduced in the Amsterdam dune system that forms the main source of drinking water for the city of Amsterdam. This artificial recharge water supply system increases groundwater storage, maintains constant water supply and improves water quality.
On 23 September 2016 the Jing Nan wetland park in Deyang, China, opened its doors to the public. This unique, 3-hectare, park combines a recreational wetland park, an artificial groundwater recharge facility, and a drinking water production plant. Design, development and realization of the multipurpose park was provided by a consortium of Chinese and Dutch public and private organisations, including Eijkelkamp Soil & Water.
Pre-treatment of river water
Every day 3 million liters water is pumped from the nearby Mianyuan river into the park for pre-treatment. The water percolates through a specially designed infiltration zone that forms a natural barrier for bacteria and viruses. The pre-treated water is then transported for post-treatment to the nearby city’s drinking water supply station.
24/7 monitoring by Eijkelkamp Soil & Water
The whole water system, from intake to effluent, is constantly monitored by a series of automated instruments on parameters including EC, turbidity, temperature, and dissolved oxygen. The system can be switched off whenever the water quality doesn’t meet the standard. Furthermore, water levels in Mianyuan river, recharge ponds, and six observation wells are continuously monitored. These data are important to understand the dynamics of the water system and can be used to optimise the operation of the system. All equipment has been delivered and installed by Eijkelkamp Soil & Water.
The water monitoring system contains Multiparameters and loggers AP 800, CTD-Diver water level loggers, Mini-Diver water level loggers, Peristaltic pumps and sounding apparatus by Eijkelkamp Soil & Water.
The Chinese participants are Deyang Department of housing, urban & rural planning and construction, Deyang Department of water affairs, Deyang water supply company and Chengdu University of technology. The Dutch participants include water utilities World Waternet, Unesco-IHE Institute for water education and private parties MetaMeta (groundwater) and Eijkelkamp Soil & Water (monitoring and training). The project was funded by the Partners for Water programme of the Dutch government and by the municipality of Deyang.