Automatic dosing of purification chemicals

In industrial and municipal process and wastewater treatment chemicals (such as Precipitants, flocculating agents, organic demulsifiers) are dosed, to be able to separate unwanted ingredients with mechanical devices out of the water (flotation, sedimentation, filtration, centrifuges etc.).
The optimal dosage depends on the water flow rate and also is strongly influenced by the nature and quantity of the ingredients, which have to be removed. Neither an under dose nor an overdose will lead to optimal treatment results.
The innovative ARU controller concept allows an automatic dosage of an optimal amount of chemicals. In the majority of cases, a substantial savings of processing chemicals is associated thus. The intensive monitoring of the processes onsite can be largely omitted.

Operation

An optical probe is mounted in a pipe between the dosing point and the mechanical separator. The optical properties of the liquid vary due to the dosage of chemicals and also due to the fluctuating water impurities.
The optical properties in the continuous flow are evaluated using special algorithms and so the dosage is optimally adjusted - even if the amount of water impurities fluctuates.
Depending on the used chemicals, different algorithms come into question. There are algorithms for precipitation, flocculation and combinations thereof, emulsion splitting and precipitation of heavy metals in use.

Simple installation, simple retrofitting

In case of smaller throughputs and pipe diameters, the dosing point for the chemicals as well as the optical probe can be mounted in the main stream pipe. In case of higher throughputs and pipe diameters, the probes should be mounted in a bypass tube.