INDUSTRY FOCUS WATER & WASTE TREATMENT SUBMERSIBLE MIXERS ARE GOING FOR GOLD
The City of Elko’s wastewater treatment facility in Nevada, USA, has completed its latest investment in Landia’s submersible mixing equipment. Elko is at the heart of Nevada’s goldmining industry. The facility’s ASP (activated sludge process) incorporates Landia’s model POP-I mixers, which have been suspending solids, homogenizing the sludge in the anoxic tanks 24/7 without any issues, as Elko’s Wastewater Superintendent Mike Haddenham explained. He said: “When our facility was upgraded to include the new activated sludge process, we certainly made the right choice with Landia’s equipment and Landia the company. The mixers do a very good job and are extremely reliable. Landia’s Ken Jacobs worked out a maintenance program for us, also training up our team on how best to service the mixers. We know that help is always at hand if we need it.” Help has certainly been welcome
during recent severe floods in Elko, which saw the average flow of 2.5 million gallons per day (MGD) rise to over 12 MGD, with serious river infiltration into Elko’s collection system
UV DISINFECTION SUITS SENSITIVE TASKS
Said to offer effective, chemical-free disinfection, Xylem has launched the Wedeco Spektron Industrial UV Disinfection Systems – designed for use in sensitive processes, such as those found in the food and beverage or pharmaceutical industries. The systems use closed-vessel UV reactors with Wedeco Ecoray
(4.5MGD is the usual capacity). Usually, much of the city’s precipitation - an annual average of less than 10 inches - comes in the form of snowfall. “You could say that we’ve been pretty
busy,” said Haddenham, who recently bought in new portable cranes from Landia for each one of the facility’s submersible mixers. “We began with just one portable
crane, but we later opted to get one crane per mixer. Again, with this order, Landia have been very easy to work with.”
Landia
www.landiaworld.com
UV lamps and ballasts, which make them sustainable while assuring consistent quality of disinfection without added taste or colour. The Ecoray technology can provide energy savings of up to 20% due to its optimised hydraulics and variable power control. In addition, Ecoray lamps achieve a high output with minimal maintenance requirements and contain less mercury than similar technologies on the market. As with other disinfection solutions in the Wedeco range, the Spektron Industrial Systems include a standard EcoTouch controller and OptiDose closed-loop control, which monitors operating conditions such as flow, UV transmittance, and UV intensity in real time. For added efficiency, the controller can adjust the energy consumption of the Spektron Industrial models depending on the dosing requirements. Systems are available in four models, ranging from 28m3
/h
to a maximum flow of 150m3
/h. Featuring an
improved inner surface, compact stainless steel cabinet and hygienic flanges, the series delivers reliable and accurate disinfection, in-line with strict hygiene requirements.
Xylem REFURBISHMENT PROGRAMME CALLS FOR NEW BLOWERS
Severn Trent Water has chosen to install energy efficient ZS oil-free rotary screw blowers from Atlas Copco at six of its water treatment plants in the UK. This forms part of a major infrastructure refurbishment programme, including upgrades to its Rapid Gravity Filters (RGF) that require low pressure air for sand de- scouring duties. The latest phase of the project
has seen ZS blowers installed at the Little Eaton Water Treatment Works in Derby, which supplies safe, clean drinking water to the city’s North-West area. Over time, it became clear that the site’s RGF process required an overhaul in order to improve efficiency, which meant the replacement of its existing blower installation. Taking up less land than other
treatment processes, a combination of Rapid Gravity Filters and disinfection has become the most widely used method of purifying a drinking water supply. The process involves water pre- treatment in flocculation tanks to bulk up impurities and particle size. Following this, the untreated water is passed through several layers of coarse grained sand and anthracite to trap all particulates. The saturated filters are then
36 SEPTEMBER 2017 | PROCESS & CONTROL
backwashed several times a day to clean the media with a combination of treated water and low pressure air to de-scour the sand filters. Such a continuous process requires a dependable, uninterrupted supply of oil-free compressed air at 0.5 bar, and relies on the efficiency of low pressure blowers to maintain the required flow rate and pressure. As one of the main contractors
for the upgrade project, civil engineering company MWH Treatment took on responsibility for the Little Eaton refurbishment programme, and turned to authorised Atlas Copco distributor Cooper Freer to specify, deliver and install two ZS 75+VEA-C-600 low pressure blowers, together with all associated stainless steel pipework, in order to replace the existing blowers. The new blowers were positioned on a high level external site adjacent to the RGF galleries. The ZS blower units
comprise a complete, fully integrated package. The rotary screw blowers are commonly available with integrated VSD control. However, the new blowers at Little
Eaton were supplied as variable speed units linked to the plant’s own inverter control system. Commenting on the successful
installation progress, MWH project manager Kelvin Smith said: “Atlas Copco’s distributor, Cooper Freer were very pro-active at the design phase in accommodating quite a few changes at an early point in the progress of this project.” Stephen James, Severn Trent
Water’s project manager for the upgrade at Little Eaton, stressed the importance of the ZS blowers: “Not only do the blowers enable a smoother flow in the filter de- scouring process, they also provide the peace of mind in providing 100% oil-free air to reduce the risk of contamination to the drinking water supply.”
Atlas Copco Compressors
www.atlascopco.co.uk
www.xylem.com/uk SWEET AS CANDY CONTRACT
ECS Engineering Services is to replace the automated trash screen cleaner grab units at the Environment Agency’s Candy Farm North and Candy Farm South pumping stations near Doncaster. Contracts for the works were
confirmed after site visits and ECS’s advice that it would not be economic to refurbish the existing equipment. Instead ECS proposed replacement with new units made by Landustrie in the Netherlands, for whom ECS is the appointed UK agent. ECS recommended the use of
identical units on both sites – Landustrie’s new R71-6 units. These will have grab widths of 1000- 1200mm, a hoisting capacity of 700kg and work to a depth of 8.3m. They will be fitted with special two-cable winches with built-in safety features, including cable management systems and a drive motor fitted with an integral brake. Commenting on the projects, ECS’s
contract manager Jamie Wesley said: “The local rivers and wider environment will be protected and the treatment works will be able to run trouble free with minimal maintenance and servicing.”
ECS Engineering Services
www.ecsengineeringservices.com
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