Water and Effluent Treatment Magazine
Issue link: https://fhpublishing.uberflip.com/i/892519
NOVEMBER 2017 WET NEWS 11 PROJECT SPECS • Overcome a biofouling issue concerning a water production borehole • Propose a solution and carry out remediation work to the borehole TECHKNOW • A 50mm pipe was used with a 'bent' lead length down to the top of the drop set casing • Chlorine dioxide was injected into the borehole • An air lifting tube was lowered into the 50mm pipe and the borehole was blasted with compressed air THE VERDICT "The consultant and client were delighted to have a fully cleaned borehole working efficiently. Also, with the dosing line still situated in the borehole future cleaning operations would be a formality with little downtime and therefore cost" Michael Bushby, BES NEED TO KNOW 1 A CCTV survey of the borehole showed substantial build-up of biofouling matter 2 BES carried out simulation trials for gaining entry into the drop set casing 3 The borehole had filled up with debris and rust which was blocking most of the screened section The submersible pump and rising main were coated in a thick red-brown layer of biofilm The borehole was then purged until all evidence of the chemical was gone. The purged water was tankered off site to a licensed waste dis- posal site. The dosing pipe was le in the borehole for future cleaning operations. The submersible pump and rising main were thoroughly cleaned and disinfected and put back into the borehole and aer a relatively short period of discharge pumping the groundwater was suitable to be sent to production. The consultant and client were delighted to have a fully cleaned borehole working effi- ciently. Also, with the dosing line still situated in the bore- hole future cleaning opera- tions would be a formality with little downtime and therefore cost. n Michael Bushby is contracts manager at Borehole Engineering Services. REWARDING OUTSTANDING Showcase your organisation's brilliance in all things water: prove that you've reached the very highest standards, as judged by a panel of leading independent experts. STAND OUT FROM THE CROWD: Gain positive PR coverage Highlight your success stories and innovative projects Be seen as award winning and sector leading Demonstrate that your work has produced effective results Give your organisation the recognition it deserves Highlight that your work is the best in the sector Portray your brand in a positive light SUPPORTED BY: ASSOCIATE SPONSOR: Submit your entry today Visit wwt.events/WIA18 CATEGORY SPONSORS: Diehl Metering offers innovative solutions for an optimal management of your water systems. The new generation of Diehl Metering products are equipped with IZAR radio OMS protocole, and are compatible with Smart City and Smart Industry networks thanks to walk-by and passive drive-by readings. The HYDRUS and ALTAIR range of water meters combined with the new IZAR Software (IZAR PLUS PORTAL) offers a complete solution for data reading and management. More information: www.diehl.com/metering or sales.uk@diehl.com Smart Metering Discover a new performance