Heat Exchangers servicing the EDF Building at Le Defence were found to be clogged with iron oxide residues, affecting the water flow rate and pump efficiency. The system comprises two injection wells, 300mm in diameter and 26m in depth, with two similar extraction wells, filtration and heat exchangers.
The isle of Wight Council look after the Castlehaven Coastal Protection scheme in the Niton area of the island. They were having trouble with the ground water contamination, possibly from the septic tanks, which was causing iron related bacteria to grow in the ground stabilisation dewatering wells.
By Mike Deed
Courtesy of Geoquip Water Solutions
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Iron oxide residues in groundwater are becoming an increasing problem, estimated to affect about 40% of the world’s water bores, and anecdotal evidence indicates that this number is steadily increasing.
Whether caused by naturally occurring bacteria or straight chemical means, these residues will eventually affect nearly everyone who sources water from groundwater aquifers.
This case study considers an air conditioning system servicing a 150,000m2 retail/industrial complex in Milan consisting of numerous offices, multiple car showrooms, mechanical workshops, training facilities and warehouses.
The system, producing 6MW (COP=4), comprises nine geothermal plants (with the largest system 50,000 litre capacity), 3 wells (each approximately 40 metres deep) and 10km of pipework between 250mm & 10mm diameter.
Environmental Expert. The Environmental Industry Online
