The implementation of CMOS multiplexers in a water quality control station to reduce costs in recirculating aquaculture

Water control automation is economically sustainable mostly in large recirculating aquaculture farms (RAS). In order to increase the economic efficiency of small RAS farms, while also maintaining environmental quality, we have developed a novel ecotechnology – a multiplexer switch for the analysis / monitoring / management / control of water properties. This multiplexer is the heart of a measurement and control system and will have two primary functions: (1) simplification of the system, by coupling various electrodes with a single measuring device; and (2) automation by connecting the central computer to water composition correction equipment (including biofilters).

This project will advance from TRL4 to a TRL6 level pilot station (technologically and experimentally validated). The novelty is the use of “solid state” CMOS electronic multiplexers / switches, which digitally select electrode combinations for various measurements. Other novelties are the realization of a new multielectrode probe and the software upgrade for measurement, control and communication. This ecotechnology will be validated in an experimental RAS to verify its performance in controlling chemical parameters that are essential in aquaculture (pH, O2, NH3, NO2, etc.). The RASCONTROL system will work autonomously, with corrective actions according to a decision tree in the software and with online supervision.

Aquaculture will benefit from this system by controlling water chemistry and by reducing operating costs. Coupling with water treatment equipment will also increase the quality of wastewater from aquaculture farms. The project proposes for equipment developed at academic level, to improve the sustainability of RAS farms by technological transfer toward a company producing water treatment equipment. This implementation will also extend the range of potential users to environmental agencies, water treatment plants, and monitoring / treatment in industrial effluents, ports and canals.