Water / Wastewater Treatment


Home Office Declares Aquaco Grey Water Recycling System a Success!


The grey water recycling system installed by Aquaco (UK) at the Home Office building in Sheffield, England has been declared a great success.


Says Head of Corporate Services Katharine Thompson”: If anyone had an issue with the facilities here, I would be the first to know”.


“In fact I had almost forgotten that there is a grey water system supplying the toilets here, it appears to be just as mains water would be,” says Katherine.


1,100 people work in the 7 floor building known as Vulcan House Steel


at Riverside, from where the United Kingdom Border Agency control immigration into the UK. There are 60 toilets, all of which use the grey water system for flushing, supplied by the waste from a similar number of hand basins and by 6 showers. The grey water is combined with rainwater captured by the Aquaco rain water recycling system from the 2,632 square meter roof.


The system comprises a 3,000 litre pre-treatment tank, supplying the unique multi-media filter supplied by Aquaco. It is this filter which is key to the water quality supplied to the system. An 8,000 litre sectional post- treatment tank holds the reserve processed water for flushing toilets and


includes main water top ups. The sectional nature of the tank allows for easy maintenance without down time.


Aquaco estimates that water usage and the water rates bill will be 50-70% less than they would be without the combined grey water/rainwater system. Depending on water charges in the area, this normally equates to a payback of 3 to 5 years. Delivered in September 2007, the system has been running successfully for 2½ years.


Trevor Tomlinson, Facilities Manager of Home Office buildings Sheffield, says: “The system is pretty good. There are absolutely no problems with it and maintenance is minimal.”


The Home Office and its agencies aims to be recognised as a green organisation in the way they do business. Along with other Government departments, the Home Office is pledged to reduce its carbon emissions by 10 per cent in the current year.


Thanks to the automatic back washing routine of the multi-media filter, an Aquaco grey water system can be left alone until its 6 monthly check and service. The unique Aquaco filtration system minimises the use of expensive chemicals and much reduces the footprint of the system.


Reader Reply Card No 89


Reader Reply Card No 88


UV Systems Help US Town Reclaim Wetlands


Removing Nitrates from Groundwater


Envirogen Technologies (USA) announced today the successful start-up of an ion exchange system for California Water Services, Salinas District (Cal Water) to remove nitrates from groundwater at the District’s 65-01 well site. The system is the seventh turnkey drinking water treatment system installed for Cal Water by Envirogen in the past decade, and will operate under a 10-year “technology+services” agreement that guarantees system performance and manages operating costs for the life of the contract. The cost to Cal Water will be based on volume and quantity of treated water. In addition to guaranteed performance, the custom-designed ion exchange system will generate low waste rates, maximise water


recovery and allow the District to fit the new treatment capacity into a minimal footprint at the well-head. According to Dr. Todd Webster, Director, Western Region, the new system demonstrates both the effectiveness of


Envirogen’s patented ion exchange technology and the benefits of a “technology+services” approach for drinking water treatment. “Our partner-type relationship with Cal Water is a model case for the services approach for employing advanced technology for drinking water treatment. It also underscores our ability to meet the guarantees we put in place when we operate these facilities for our customers,” Dr. Webster said. “With seven successful projects over a decade working together, we are pleased that Cal Water has seen the benefits for its customer base of combining innovative technology solutions with a performance guarantee. We’ve been able to offer trouble-free operation and maintenance and significantly lower lifecycle costs,” he continued.


The nitrate removal system at Salinas District Station 65-01 is designed to handle 1.1 million gallons per day (GPD)


of groundwater and will treat influent nitrate concentrations of up to 41 milligrams per liter (mg/L) down to less than 30 mg/L, incorporating a blending step for maximum operational efficiency. The 10-year services agreement, typical of Envirogen’s projects for Cal Water, provides guarantees of performance for the life of the asset, volume of salt consumption, volume of waste brine and finished water quality. The agreement covers all treatment equipment and associated connections. In addition, Envirogen conducted start-up and commissioning services and will be responsible for disposal of waste brine and full operation and maintenance of the unit for the 10-year period. Envirogen employs a full-time dedicated technician in the Salinas District to provide these services at all seven installations.


According to Mike Jones, District Manager for Cal Water Salinas District, the new treatment system will provide further support for the District’s service mission. "We are looking forward to having the new Envirogen plant operational,” Jones said. “This plant will strengthen our ability in providing our customers with safe, high quality water."


Cal Water is one of four subsidiaries of California Water Services Group, one of the largest investor-owned utilities in the United States (based on population served) with nearly 900 wells providing service to more than 1.7 million people. The Salinas District is located in a heavily agricultural area and is 100% dependent on groundwater sources, facing constant issues of both nitrate contamination and saltwater intrusion.


Reader Reply Card No 90


Berson (The Netherlands) has helped the town of Carnation in Washington State, USA create an innovative, environmentally conscientious way of dealing with wastewater, using Berson’s InLine 7500+ UV systems.


Carnation, a community of about 1,900 residents, has never used a central


sewage system, relying instead upon individual septic tanks and drainage fields to handle its wastewater disposal needs. However, soil surveys conducted in 1987 revealed that the city’s current wastewater disposal method had become insufficient for the growing population’s needs and continued usage of the current system posed a contamination threat to the local unprotected aquifer. Carnation anticipated its future growth and recognised the associated health and environment problems that could come without a more developed wastewater system.


To deal with this issue, Carnation worked with officials from King County to


develop plans for a new sewage system and wastewater treatment facility. Officials chose to integrate a Membrane Bioreactor (MBR) system with UV disinfection technology to ensure that the treated water would be clean and environmentally safe. Reclaimed water would then be discharged to the nearby 24 hectare Chinook Bend Natural Area to foster growth of wildlife and restore the wetlands. The resulting facility was awarded the “Small Project of the Year Award” at the 2008 WateReuse Symposium in Dallas, Texas.


To find UV disinfection equipment suitable for this application, King County turned to Berson (through its US sister company). Berson provided two parallel InLine 7500+ UV units installed in-series after the MBR system. The units are closed vessel, which allows them to flange directly to the piping from the MBR. Each UV unit is capable of treating large volumes of water, with one unit treating up to 5.3 million litres per day, with the second unit providing back-up treatment. The system utilises Berson’s medium pressure, high intensity lamps to provide a compact footprint for disinfection. The InLine systems are low maintenance, with automatic mechanical cleaning to keep quartz sleeves surrounding each UV lamp deposit free.


The Carnation wastewater plant’s discharge is Class A, the highest quality


level of reclaimed water recognised by the state of Washington. Water is released into Chinook Bend Natural Area throughout the year, except during maintenance periods when output can be switched to the nearby Snoqualmie River.


According to Carnation wastewater plant supervisor, Dan Zimmer, the UV


equipment’s performance has met expectations producing reclaimed water for the facility without any permit violations. In May 2010, after two successful years of operation, the automatic cleaning system had worked flawlessly and the UV lamps only required a single change. “The UV equipment at the Carnation site has performed well, requiring minimal maintenance. I would recommend Berson’s closed vessel UV systems to another plant,” said Zimmer.


Reader Reply Card No 91


www.pollutionsolutions-online.com • Annual Buyers’ Guide 2011


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