Water / Wastewater 23 Automatic, Online Monitoring for Stable and Cost-Effective Water Treatment


An innovative online zeta potential analyser for water treatment allows water plant operators to control coagulation processes with enhanced levels of accuracy and confi dence. The Zetasizer WT from Malvern Instruments (UK) is a fully automated analyser that continuously monitors the properties of water during coagulation to provide precise and reliable data for optimising chemical dosage levels. Delivering absolute (no calibration), highly sensitive analysis the new system enables a proactive response to changes in the process, enhancing plant stability and reducing the risk of signifi cant events. The associated optimization of charge neutralisation processes results in substantial fi nancial benefi ts due to a reduction in chemicals usage, with savings in the order of 20% reported by existing users.


Clarifi cation, a process of coagulation and sedimentation to remove suspended particles in raw water, is a critical step in drinking water purifi cation. The Zetasizer WT continuously measures zeta potential, a parameter that directly quantifi es the charge of colloidal particles in the water and predicts the likelihood of coagulation. Setting upper and lower zeta potential limits, beyond which fl oc formation is poor, provides the plant team with a defi ned target for safe operation and a simple and clear means of tuning coagulation. The technology reduces reliance on largely manual and user dependent alternatives which provide little insight as to how to alter operational parameters in response to changing conditions, and provides a level of confi dence and specifi city absent in other online techniques.


The Zetasizer WT is a standalone system that can be installed on either new or existing water treatment plants. It requires only a standard power supply, a pumped sample water feed and a covered site. Results are reported in [mV] and are displayed locally as well as sent to a central control facility. Zeta potential is measured at a user selected rate of up to one measurement every two minutes to provide data resolution that is suffi cient for the control of rapidly changing processes. These data improve the effectiveness of manual decision making and, at the same time, provide a secure platform for automated coagulant dosing control.


CMT Multilevel Groundwater Monitoring System


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Monitor groundwater levels, and sample groundwater or soil gas, at multiple depth discrete zones in one well. The Solinst (Canada) Model 403 CMT Multilevel System provides site assessors with detailed subsurface data. The System is available with either 3 or 7 channels, with monitoring ports easily constructed at different depths in each channel. Both CMT Systems are inexpensive and easy to install, design fl exibility allows port locations and monitoring strategy to be fi nalised right on site.


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The Use of Turbidity Sensors in Catchment Monitoring


Aquaread (UK) have been developing turbidity sensors for many years for use within their Aquaprobe range. In fact, these sensors were used in a 3.5 year project with Brighton University for the study of turbidity and suspended particulate matter as detailed in the publication titled Suspended sediment regimes in contrasting reference-condition freshwater ecosystems: Implications for water quality guidelines and management. Grove et al, Science of the total environment, Vol 502, 2015. Within this study 10 Aquaprobes were deployed across the UK at various different catchment sites, where they were continuously deployed for 3 years collecting data for comparison with sediment grab samples.


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The majority of turbidity data collected at each catchment site was below 100NTU, and this level is common in many fi eld applications. The 20NTU calibration point that’s present in all Aquaprobes facilitates accurate measurements in this low 0-100NTU range. When deployed with the AquaLogger, as used in the above study, you have a very robust and accurate monitoring platform that’s suitable for use in all water types. The Aquaprobe has the added advantage of being fl exible; it’s ideal for medium term deployments with the AquaLogger, but can also be used as a portable system with the GPS Aquameter.


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34702pr@reply-direct.com Measurement of Helium in Fossil Water


Helium generated deep within the Earth’s mantle eventually reaches the Earth’s crust and surface carried in solution from aquifer-gathered fossil water, the concentration level providing a key indicator of the rate of helium generation and transport.


Hiden Analytical (UK) manufacture the HPR-40 DSA mass spectrometer series specifi cally for analysis of gaseous species in aqueous solution, using membrane separation interfaces to inhibit water vapour transfer and maximise the transmission of the gaseous species of interest. Hiden develop a new membrane interface specifi cally optimised for detection of trace levels of helium in aqueous solution, with detection capability down to 10 picomoles of helium per litre of water.


The standard interface is confi gured for fl ow-through sampling of the studied media, with other confi gurations available to enable the interface to be immersed directly into the media. Alternative


membrane interfaces are available optimised for sampling of gases and vapours with higher molecular weights up the 300 amu. Operation of the mass spectrometer is automated with full manual over-ride, giving user access to all system performance and control functions.


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Latest Addition to Portfolio of Sound Velocity Sensors and Profi lers Released


Valeport (UK) recently released the latest addition to its portfolio of sound velocity sensors and profi lers, the SWiFT SVP.


Positioned as the ultimate handheld profi ler, the SWiFT SVP has been designed from the outset with the intention of a seamless workfl ow, and has integral GPS to geo-locate every profi le. This new compact unit features high accuracy sound velocity, pressure, temperature, salinity and density measurement, plus integral GPS, re-chargeable battery and LED status indications for GPS, battery and communications.


Using a simple ‘twist and go’ switch on the unit, data can be easily and quickly downloaded, reviewed and translated to common SVP formats wirelessly via Bluetooth Smart, which uses the SWiFT APP on iOS devices where data can be instantly shared via FTP, email and cloud services. Valeport’s standard DataLogX2 software for PC use will also support the SWiFT SVP.


With a battery endurance of up to a week and easy charging via USB, the SWiFT SVP is intended for coastal, harbour and inland hydrographic survey use, and offers the highest quality sound velocity profi les in a compact, robust and portable package.


Valeport has been leading the way in sound velocity technology for over decade and the SWiFT incorporates Valeport’s world leading high accuracy sensor technology, but as Valeport sales and marketing manager Kevin Edwards commented, this exceptional performance doesn’t have to come at a price: “We’re aiming the SWiFT at the popular shallow water market and whilst it’s constructed from Titanium to provide unmatched durability, includes our innovative sensor technology for exceptional data quality, and has been meticulously designed for easy handling weighing in at 2Kg, the SWiFT is simply our best, professional and affordable SVP to date. And we anticipate the SWiFT will lead the way in the support of hydrographic surveying.”


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Take a look at our website www.envirotech-online.com


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www.envirotech-online.com IET January / February 2016 35400pr@reply-direct.com


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