Water Treatment Roundup

Pulsed UV system contains no mercury

Lightstream Technologies' LSi water disinfection system integrates pulsed ultraviolet (UV) light, digital operating systems, optimum fluid dynamics and user-friendly touch screen operation into a "plug & play" disinfection machine that uses no chemicals and contains no mercury.

The use of pulsed UV presents an alternative to continuous wave UV systems. Pulsed UV delivers light in high intensity pulses or "bursts" that can be repeated up to 30 times per second at an average UV power of 2,500 watts and peak UV power of 6,000,000 watts per pulse. In addition, the LSi uses a single xenon flash lamp that eliminates safety concerns.

Lightstream's patented Constant Optimum Dose methodology provides real-time accountability based on performance. The LSi conducts continuous sub-second analysis of the water's UV transmittance and makes real-time adjustments to deliver the exact specified UV dose. An internal closed loop control system adjusts the reactor module's UV power and/or flow rate to accommodate a wide range of varying influent conditions.
Lightstream Technologies, Inc.
Reston, Virginia, USA

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UV disinfects boiler feedwater

The UK company Hanovia installed a Photon UV water disinfection system that destroys any microbiological contamination in boiler feedwater in the power station boiler water treatment plant of Slough Heat and Power (SH&P) Limited, England. A wholly-owned subsidiary of Slough Estates plc, SH&P supplies electricity, water, steam and district heating on the estate.

Feedwater is abstracted from local boreholes, chlorinated at source and treated with UV before delivery to the reverse osmosis (RO) plant. The RO permeate is then polished with a demineralisation unit before use as boiler water. Handling 40 m3/h, the UV system destroys microbiological contamination before it passes through the RO plant, which is vulnerable to biological fouling.

Photon UV series controls provide an interactive microprocessor-driven controlled system. Screen displays include UV dose in mJ/cm2, UV intensity in mW/cm2 or percentage, hours run, water flow rate and temperature. The Hanovia UV monitor is sensitive only to germicidal wavelengths and is immersed directly in the water to avoid problems of condensation on windows.
Hanovia Limited
Slough, Berkshire, England

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Filter system handles high dirt content

The automatic filter HydroFluid allows continuous fine filtration (from 10 µm) of liquids with high dirt content in water, wastewater, industrial water and oil-rich media treatment applications. The automatic filter functions without backflushing or mechanical cleaning.

The dirtied liquid flows tangentially into the ring channel offset from the housing of the HydroFluid. The ring channel design dampens the flow and achieves pre-separation. Dynamic scrapers move around the filter element and cause the liquid to rotate. Centrifugal forces transport dirt particles from the filter element in the direction of the housing wall where they are continuously deflected downwards. The hydrodynamic scrapers generate a partial vacuum creating unstable flow conditions on the surface of the filter element, which improves efficiency. These effects prevent filter cake from forming on the filter element surface.
Mann+Hummel Holding GmbH
Ludwigsburg, Germany

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DMUs produce safe water

Ion Exchange India commissioned two disaster management units (DMUs) for the Public Health & Engineering Department (PHED) to treat drinking water in Malda and Barassat. The DMU is a containerised water treatment plant mounted on a truck that is fully automated and comprises ultrafiltration, reverse osmosis and ozonator along with catalytic converter for arsenic removal. The unit is powered through its own diesel generator.

The DMU supplies safe drinking water in cases of calamities like floods, drought and earthquakes. The DMU treats any type of surface or high salinity groundwater to produce safe drinking water conforming to IS 10500 standards.
Ion Exchange (India) Ltd.
Mumbai, India

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ZeeWeed system serves small communities

The Zenon Modular Drinking Water (MDW) system, designed for small communities of 50 to 5,000 people, uses ZeeWeedRegistered immersed membrane technology. ZeeWeed is NSF 61-certified, features a reinforced hollow fibre which guarantees a long membrane life.

The new MDW system, an automated, single-step process, requires minimal operator supervision. This system consistently produces a high quality permeate with a turbidity of <0.1 NTU, > 4 log giardia and cryptosporidium removal, and can achieve up to 85% TOC removal. Pre-engineered, modular construction makes the MDW an economical package for small communities. Simplified controls ensure low operating and maintenance costs.
Zenon Environmental Inc.
Burlington, Ontario, Canada