Kobold Instrumentation was tasked to provide a solution for the problem of phosphate precipitation in wastewater treatment plants.
By adding iron (III) chloride (FeCl3) into the aeration basin, the phosphates dissolved in excess wastewater are chemically mixed with sludge flocculants and transferred with sludge to the sludge treatment stage. This process reduces phosphate concentration in waterways and therefore minimises the potential for abnormal algae growth, and the detrimental effect to the aquatic eco-system. Because an overdose of iron (III) chloride results in massively polluted water – toxic to humans as well as the environment – a completely dependable method of process monitoring was sought. The ideal was a continuous flow measurement of the dosing chemical with a direct data connection to the process control system which would guarantee water treatment plant owners maximum safety; so that possible errors were not just discovered after the event when it is too late.
The solution on offer from Kobold is the MIK magnetic-inductive flowmeter, an optimal and economical solution for safe dosage of iron (III) chloride and specifically developed for this application. The unit has already proven itself successful in service, specifically for electric conductivity liquids, acids and caustic solutions, drinking, cooling and wastewater, ground water, raw water, aggressive or salty solutions, but is unsuitable for oil as it lacks conductivity.
The MIK is housed in Polyvinylidene Fluoride (PVDF) and the electrodes in contact with the medium are made of tantalum. Both materials have proven to be totally chemically resistant. Together with the direct mounted transmitter with stainless steel housing, this device forms a very compact yet robust unit, which is ideal for fitting inside cramped control cabinets. It allows detection of very small dosage amounts from 10 mL/min.
The device operates according to the principle of electromagnetic measurement and via an analogue 4-20 mA signal (or optional pulse output) the MIK continuously communicates the measured values to the users’ process control system. This results in increased efficiencies and cost savings in the amount of iron chloride required to achieve phosphate removal, as well as the vitally important environment protection component.
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