Development and demonstration of RAS-system key technology and equipment in China

Purpose and goal

A RAS plant was designed, installed and put in operation together with the local Chinese partner Haiyang Aquatic Products Ltd. The plant is still in continuous operation with a substantially lower water consumption and higher fish density compared with the local RAS systems. The plant is frequently used as a reference for new customers and partners and the relation with Haiyang is very good. A large database from the operation has been produced which is now used to develop the RAS systems. A study report on desinfection methods has been produced in co-operation with Stockholm University.

Expected results and effects

A RAS plant was designed and installed by Wallenius Water to produce 35 ton flat fish per year in Shandong, China and has been in operation since May 2015. In January 2017 the system was still running smoothly reaching 57% of its design capacity and 90 % water recirculation. The plant is used frequently by WWT as a reference case and recieves many visitors. Research conducted with Stockholm University show that both capital and operational costs are higher for an UV or AOT system compared to an ozone system to inactivate an algae: P. subcapitata.

Planned approach and implementation

The project management to design, install and startup the RAS plant in China was led and supervised by Wallenius Water Sweden. The daughter company in China made all local purchasing and installed and started the system on site. The partner Haiyang Aquatic Products Ltd. in China constructed the building including fish tanks. The partner also handled the daily operation of the plant. Wallenius Water in Sweden cooperated with Stockholm University to conduct research on desinfection methods in RAS.