A 24 hour supermarket on the outskirts of London, part of a major chain, had frequent customer complaints about the unpleasant smell emanating from the urinals in the male toilet area. All attempts to resolve the matter over an eighteen month period proved unsuccessful. Cleveland Biotech were asked to investigate and, if possible to remedy the problem. The source of the odours was identified as uric acid crystallising in the urinal drain lines, but also, in part, to uric acid trapped under the floor tiles around the urinals. This latter problem is common due to the inaccuracy of the male species even though they are equipped with a pointer. The uric acid gets under the tiles through the grout where it crystallises and produces odours. Cleveland Biotech recommended that an automatic Clearinate Dosing System be installed in the men’s toilets dosing concentrated Clearinate into the cistern of the urinals on a programmed basis. They also recommended that the cleaners added Clearinate to their daily wash water in order to degrade the uric acid under the tiles. Both recommendations were accepted and the Dosing System fitted in August . Within four weeks of the adoption of these proposals all the odours were eliminated and no further customer complaints about urinal odours have been recorded since.
Case Study - Amistad Dam: Scan for Leaks in Earthen Dam
At the Amistad Dam site an investigation was made with a 56 electrode STING/Swift system to determine the location of leaks which have effectively drained the giant dam of water. As it was not immediately obvious which array type would return the best data three different arrays were recorded on the same electrode layout. The resulting three 2D profiles show both similarities and differences. The conclusion is that dipole-dipole and Schlumberger are good choices for lateral structures whereas Wenner gives high...
Structural behaviour of RC beams externally strengthened in flexure with SRG and SRP systems
This paper presents the results obtained from an experimental investigation carried out on a set of reinforced concrete beams strengthened in flexure by using an unidirectional high–strength carbon steel fibre reinforcing mesh embedded in an inorganic matrix (SRG: steel reinforced grout) and in an organic matrix (SRP: steel reinforced polymer). Test parameters include the use or not of external U–wrap end anchorages in order to prevent delamination premature failure of the longitudinal sheet and to evaluate the...
When You Need It All - Adapted from information provided by QSP Packers, LLC.
QSP Packers, LLC manufactures Inflatable and Mechanical Packers used in the environmental, mining, and water well industries, with an emphasis on pressure grouting. When Mark Hartley and Ron Roland began in 2005, they wanted to fill a niche in the packer industry. Since both men worked in the industry for a combined 40 years, they knew what the niche would be and chose a name for the company to reflect this message. Quality, Service, and Price (QSP) – the commitment they pledge to their customers. The...
Remediation of Oil Refinery Sludge Basin
AbstractWork was completed in early 1992 to clean up a 5.5 acre (2.2 ha) stormwater sludge basin for an oil refinery company. The basin, which had served as a stormwater collection and settling pond for over 40 years, contained oily sludges with high concentrations of certain metals and volatile organic compounds. The closure plan included a combination cement-bentonite slurry wall and jet grouting along the perimeter of the basin. The sludge and contaminated soil beneath the basin were solidified in place using...
Jet Grouting to construct a Soilcrete wall using a twin stem system
Abstract:An existing coal-loading pier located in Norfolk, Virginia was completed in 1961 for the purpose of loading ocean-going ships with coal for export throughout the world. The size of the ships that could be fully loaded at this facility was limited to the depth of the mud line adjacent to the loading pier. It was determined that dredging adjacent to the pier would provide an increase in loading capacity and productivity for pier operations.Since the existing pier is supported by concrete piles, there was a...