18 Water/Wastewater


Non-Contacting Control for the Mersey Estuary Pollution Alleviation Scheme


Pulsar Process Measurement (UK) have supplied non-contacting ultrasonic level measurement instruments that have been incorporated into United Utilities flagship project, the Mersey Estuary Pollution Alleviation Scheme (MEPAS), providing key control and monitoring functions throughout the network of CSO/SSO chambers, vortex and interceptor sewers that form the MEPAS network.


When the major Sandon Dock Wastewater Treatment Works was expanded during the 1990’s, the scheme included a substantial network of interceptor sewers and CSO, designed both to separate out solids and particulates before the main Works and to manage storm surges. Some of Pulsar’s earliest equipment was used as the project went live, including the unit that bears the serial number 0001. The Mersey is now so clean that, within a few hundred yards of the sewage treatment works itself, a scuba diving centre is flourishing, and many species of fish have re-established themselves in the river.


However, following major and damaging floods in 2010, it became clear that the existing control and monitoring regime that controlled the flow to the


WwTWwas not operating as it should. The new control systems contractor, Ramptec, along with UU’s modelling team, redesigned the system operation through the 39 CSO’s within the network. Pulsar Process Measurement supported, ensuring that the ultrasonic level measurement instruments at each location were performing correctly.


Under the new control arrangement, the holding capacity of the system is maximised, so storm flows to the works are better managed, discharges of untreated and semi-treated sewage to the Mersey are minimised, and limits are in place and controlled accurately to avoid any risk of further flooding arising from overflow of the system. Each CSO includes three or more Pulsar units, at measurement points to maintain control and flows – within the chamber, at the outfall end, measuring river levels and within the vortex chamber feeding on to the wastewater treatment works. Some of the applications were challenging, including measurement down narrow pipes that was previously undertaken using pressure transmitters. Pulsar remained involved throughout the project to re-establish control, providing service and commissioning support to Ramptec.


As Ray Watts of Ramptec put it: ‘We have a very good relationship with Pulsar. The fact that we have their first unit, dating back to 1997, and also some of their latest equipment, proves that they supply good equipment and are able to back it up effectively’


The sternest test of the operation of the new system came in September 2012. The 25th September saw some of the worst storms on record, and the effluent height in the culvert reached 4.5m AOD (metres above ordinance datum), a volume of water that would have potentially resulted in devastating flooding if it had not been properly controlled. Both the control system and the CSO’s worked perfectly, however, releasing the excess water safely away from habitation.


For More Info, email: 26532pr@reply-direct.com Want to Save Money? Save Water


It’s no secret that saving water means saving money, but how do you do that quickly and efficiently?


The answer is SebaKMT (Germany). With focus on cutting-edge technology and operational efficiency, the German innovators have become globally renowned for fast and accurate leak detection. Highly-sensitive noise loggers, powerful correlators, fully equipped leak detection vans, and unmanned network monitoring systems – SebaKMT’s instruments offer water utilities, consultants, and contractors solutions to detect leaks the moment they appear and locate them just seconds later.


That’s how you save water and money too. 26016pr@reply-direct.com


For More Info, email: The Answer to Challenging Applications


In close cooperation with their distributors and customers LAR Process Analysers (Germany) have developed a new reagent and filter-free QuickTOCultra product line that is based upon the unique thermal oxidation technique at 1200 degrees Celsius. It offers the ultimate solution for difficult applications integrating a unique injection system, a proven and patented catalyst-free oxidation technique and a multi-stream option in one analyser. Due to these features, the QuickTOCultra analyser has no problems in meeting the high online TOC measurement requirements for difficult waste water applications.


The method does not require dilution, catalysts or even filtration. A raw waste water sample is directly injected into the reactor, where all organic substances, including particles, are oxidised and measured with a NDIR detector. It is capable of handling a sodium chloride (NaCl) content as high as 30%. Due to the enormous expansion of the injected waste water sample, salts are vaporised and blown out of the reactor and collected in a specially designed reactor foot.


Blockages, defective reactors, replacement of parts and long downtimes belong to the past. The QuickTOCultra analysers have very low maintenance and operational costs, as well as high availability, resulting from the analysers' construction and high temperature technique. Additionally, the analysers use a complete and intuitive new software with touch screen, exceeding our wish to deliver a comprehensive, easy to understand and user-friendly solution in online analysis. To conclude, the aforementioned features and the possibility to measure up to six streams make these customised analysers extremely well suited to the monitoring and optimisation of industrial processes, as well as to their use in industrial and municipal waste water treatment plants.


For More Info, email: 24543pr@reply-direct.com Cost Effective UV Spectroscopic Analysis of Water


The UV300, from Tethys Instruments (France) is a cost effective water analyser for applications focused on one or two parameters. Mainly based on uv spectroscopy, well known for its stability and low operating cost, the UV300 can measure parameters like organic matter, nitrate, colour, aromatics hydrocarbons (pah). Complementary modules allows the measurement of po4 by colorimetric method and turbidity by a visible or infra-red laser diode. External probes can be added for physicochemical parameters like pH, orp, dissolved oxygen and conductivity.


Thanks to its automatic cleaning system and its extremely long life time lamp, the maintenance is roughly limited to the periodic refill of the inexpensive cleaning solution.


A new web-based interface allows the control and the troubleshooting at distance using an internet browser on a computer, tablet or i-phone. 25116pr@reply-direct.com


For More Info, email: AET August / September 2013 www.envirotech-online.com


Intelligent Level Sensor with Integrated Transmitter


The new i-Series sensors by NIVUS (Germany) stand out for their robust design and very easy operation. An important benefit of the new sensors is the quick and easy set-up. Thanks to the sensor-integrated transmitter and pre-set measurement range steps it is possible to directly connect the sensors to PLCs, data loggers and other systems without the need for additional programming expenses. Moreover the sensors are suitable for use in extreme environments. A special encapsulation allows to maintain a protection rating of IP 68. The sensors additionally fulfil the requirements for use in Ex areas Zone 1 and 0.


Another advantage is the very high accuracy of the measurement results. The unique DATEM echo signal processing (Digital Adaptive Tracking of Echo Movement) dynamically follows the useful echo, continuously masking out static as well as moving false echoes. Grease rims building up, fixed constructions with irregular adhesions or manhole steps are detected automatically and will be masked out. Moreover the sensors provide high operational reliability.


The innovative energy concept featuring lowest possible start times and measurement intervals allows unrivalled lifetimes for independent and battery-powered data loggers.


The sensors can be used in any place where levels, distances, and volumes of liquids and bulk solids need to be measured.


Typical applications: Measurements in the water and wastewater area as well as in industry; Stormwater treatment facilities; Pump stations; Level measurement in rivers and channels; Flow measurement on weirs and Venturi channels; Volume measurement in tanks.


For More Info, email: 26316pr@reply-direct.com


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