water splash in a glassWater Treatment

The 7th International Conference and exhibition on Water Wastewater and Environmental Monitoring (WWEM) will take place at Telford, England on 2-3 November 2016.

We are giving a workshop on Thursday 3rd at 11:00 (in room 7).

This is “A brief introduction to zeta potential and sizing techniques in the water industry” and will mainly be focused on zeta potential which is gaining popularity as a monitor of particle instability to optimize the addition of expensive treatment chemicals, ultimately saving money.

Seasonal and geographical variation means the amount of chemical coagulant that needs to be added on a plant will vary constantly. One solution is to constantly add excess coagulant, but that is expensive. This induces a phenomenon called sweep flocculation.

Many plants instead control the amount of coagulant. The traditional method for this is the jar test, where you’d put an equal amount of water into multiple vessels, add a differing amount of coagulant to each jar, stir and wait. After 15 minutes you can see roughly how much coagulant to add, but it’s quite subjective, takes time and the natural tendency is to add a little bit more than the minimum to be safe (which adds cost).

Over the last few years there’s been an increase in the sales of laboratory Zetasizer in this area. The charge on the particles can be monitored, and the reduction in charge with increasing chemical concentration is followed. A concentration that is close to zero, but not quite can be settled on as flocculation still rapidly occurs, but the system hasn’t been overdosed and so cost savings can be made.

However the system is still reliant on someone taking a sample and measuring it in the laboratory, so there is a “time lag” between sampling and result. The Malvern Zetasizer WT (Water Treatment) system was developed by Malvern in conjunction with Severn Trent Water to take the Zetasizer to the point of sampling and pass results directly to the central control rooms where decisions on dosing can be made.

This has enabled substantial additive cost savings to be made.

The workshop will cover a brief theory of zeta potential and some real case study data of its use within the water industry. No prior knowledge of zeta potential is needed and all are welcome. There’s also a poster with additional data in the main conference and a Malvern stand where we are happy to discuss all applications questions in the water treatment area.

Join us and visit our stand 16


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