Wednesday, November 7, 2018

Clewer Aquaculture presents new patented RBBR-technology

By Clewer, Finland

The Clewer rotating bed bioreactor (RBBR) is the basis of the Clewer Aquaculture RAS system.

It was first developed as wastewater treatment plant for cleaning domestic wastewater fifteen years ago. Later it was used in car wash plants, where water consumption can be reduced by up to 10 percent, compared with conventional car washes. In both wastewater treatment and car wash plants, these reactors have been widely used around the world, from desert to urban environments. In aquaculture these bioreactors have been involved in large-scale testing for seven years. All these three product lines are now part of the Clewer companies, which belong to Salmela Group of companies in Finland.

The recycling system for aquaculture has been tested with several species and growing temperatures in our commercial scale RAS-system of our R&D unit. Carefully managed practical culture tests with rainbow trout (temperature 16°C), pikeperch (21°C) and African catfish (26°C) are the basis for sizing the systems. The knowledge for these tests is based on the long history our personnel has in aquaculture. Since the 1980s we have been involved in practical fish farming, consulting and teaching. After seven years of testing, RBBR is now ready and new, efficient and maintenance-free bioreactors will soon be installed for commercial aquaculture use.

The main principle in the development work of the RAS system by Clewer has been to design a system as easy to use and as maintenance-free as possible. Minimising running costs is also a key issue for us. It is possible to make the installation completely on top of the floor. The bioreactor doesn’t need a pressure inside and the head loss is low. We oxygenate the water in the system using a semi-low head oxygenator to optimise the cost of the gas treatment in the system. Effectivity and economy are comparable to the other best comparable ways, and have been used for years in practice. Another practical and cost-effective factor is that transportation of the biofilter by road is possible without the need for any special arrangements.

Read more HERE.

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