This project brings together a group of devices within a 'machine' for the remediation of waters from mine workings. The system comprises:

• Metering Valve A motorised stainless steel ball valve with flow/angle characteristic for regulation in 1% flow increments for the dosing of alkali into the mine water (pH of water ~4.0).
• Flow Meter A triangular profile weir (ISO 4360) with ultrasonic level measurement. Flow rate of the mine water is computed. Typical flow rates 50 to 350 g/m.
• Mixing Chamber Located just downstream of the weir, to ensure thorough reaction with the alkali.
• pH Sensor The sensor measures the pH of waters at exit from the mixing chamber.
• Control Module Regulates the valve to control the exit pH signal within limits (9.8 to 10.2).
• Data Recorder To log flow rate, pH and valve angle. these the primary variables of the machine.