Product category:
Pumps, Vacuum pumps
News Release from: PCM Pumps | Subject: Alldos KM Series
Edited by the Processingtalk Editorial
Team on 22 September 2005
Chemical dosing equipment for water
supplies
Recent EU legislation designed to raise potable water quality standards necessitated some updating of the Lound WTW, belonging to Essex and Suffolk Water
Recent EU legislation designed to raise potable water quality standards necessitated some updating of the Lound WTW, belonging to Essex and Suffolk Water At Lound WTW, improvements were required to reduce the risk of the formation of trihalomethanes (THM) formed during the treatment process when chlorine mixes with naturally occurring organic material in the water
This article was originally published on Processingtalk on 20 Feb 2006 at 8.00am (UK)
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A Dissolved Air Filtration (DAF) Plant was chosen as the solution because of its proven effectiveness where algae-laden, low turbidity and highly coloured water conditions prevail.
Earth Tech Engineering, who were the process designers for the project, appointed Corby based PCM Pumps to supply and install new Chemical Dosing equipment, which would be critical to the operation of the new process.
PCM, working in conjunction with Earth Tech, engineered and installed complete ferric chloride, caustic soda and sulphuric acid storage and dosing systems for the newly constructed DAF building on the Essex and Suffolk Water site.
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Each of the PCM supplied systems included two chemical storage tanks and a dosing skid incorporating two Alldos KM Series piston diaphragm dosing pumps in a duty/standby arrangement.
The pumps offer low maintenance leak free operation, owing to the hydraulically actuated diaphragm principle, which also incorporates an internal pressure relief valve as a means of pump overpressure protection.
The dosing skids were pre-wired and fully tested at the PCM factory before delivery to site.
Each skid is fitted with clear PVC splash screens for operator protection enabling maintenance to one pump and associated dose line components whilst the other chemical dose line remains operational and without compromising the integrity of operator protection, thereby providing a true duty/standby dosing system.
Due to their physical size, the six chemical storage tanks (ranging from 15m3 to 26m3 each) were positioned in the new building prior to the roof being installed.
PCM then installed the factory built chemical dosing skid units and completed the installation of all interconnecting pipework, which was fabricated on site by coded welders.
Each system also included the installation of access ladders and platforms, mezzanine floors, chemical splash protection screening, and dual contained tank fill lines.
Chemicals are delivered to the site by road/bulk tankers to three dedicated intake loading points, one for each of the three storage areas.
Ferric chloride at a concentration of 40% is then pumped to two vertical cylindrical GRP storage tanks - BS4994 cat 1 - to be used as a flocculent.
47% sodium hydroxide (caustic soda) used for pH control is transferred to two PD5500 cat 3 carbon steel storage vessels, which are supported on fully welded steel cradles.
These tanks are heated and fully lagged to ensure that the contents are maintained at operational temperature; each tank has independent temperature control and a temperature indicator.
96% sulphuric acid, also used for pH control is contained in two horizontal cylindrical stainless steel storage vessels, also of PD5500 cat 3 design and construction.
Typically the Lound site currently processes 12Ml of water per day although a further 6Ml/day capacity is available.
All plant equipment, materials and coatings including pipework, valves, flowmeters etc comply strictly with current water quality regulations and standards and are able to withstand chemical attack.
PCM Pumps secured the contract for the sulphuric acid, caustic soda and ferric chloride systems together with a further contract for the supply of three of their Delasco series peristaltic pumps for sludge transfer.
Richard Horton, Earth Tech Project Manager for the installation commented, "although faced with a potentially difficult time factor problem, whereby storage tanks had to be installed prior to erection of the new DAF building, PCM coped well, and in the end made the installation comparatively straightforward.
I would say that they did a good job, working very hard to be customer focused and most importantly, the equipment they installed is functioning well".
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