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Microstrainers improve water quality
+JSTRIALNEWS Bormetwins contractfor world’slargest single-beltscreen A 2.8 m wide Bormet singlebelt screen, which is claimed to represent the largest of its type in the world, is to be supplied to the Karlsruhe Sewage Water Treatment Works in Germany. The modular design of the fine screen enables specliic requirements on width and depth to be met. A series of fine-screen modules, linked by a continuous drive chain, carry particulate matter out of the flow and to a high-level discharge point. Cleaning is effected by four processes: gravity as the belt inverts, a large driven brush, a specially designed spray bar, and intermeshing of the individual elements. This automatic cleaning process ensures that only fully cleaned screen elements return to the working area.
While appreciating the technical ability of the Bormet equipment, following a practical demonstration at Portrack Treatment Works, other factors influenced the purchase, primarily the ability to use a single belt across 2.8 m, which offers both cost and operational benefits. The single belt concept makes a major contribution to reducing channel construction costs, and presents a larger surface area to maximise filtration. Simple maintenance with front access allows multiple parallel installations. Bonnet Maschinenbau GmbH & Co KG, PosL 148, A@erhalb 24, D-6108 Weiterstadt, Germany. Water-Process Plant Supply Ltd, 64 High SEreet, Edenbridge, Kent ZV8 6AJ, UK Tel: + 44 (0) 732 862974, fax: + 44 (0) 732 863671.
Microstrainersimprovewaterquality An order to supply a waterworks in Germany with microstralners to improve the quality of draining water is among recent successes for the microstrainers department of Weir Pumps. The f400,OOO order is for four machines with washwater pumps, pipework and valves, and including supply, delivery to site, installation and commissioning. The large MS321 machines are for the removal of algae and other solids in the raw water supply, and a smaller MS21 1 is for the recovery of washwater used for cleaning the larger machines. Microstraining is a simple, low-cost form of mechanical fine filtration using woven stainless-steel wire fabric screens with apertures of less than 0.1 mm, and is used to remove microscopic zooplankton, algae or other solids from water or effluent. In practice the particles retained by the fabric build up into a filtration mat, forming a filter finer than the apertures. Weir microstrainers retain solids of Flttratton & Separation
June1993
particle sizes from 16 to 100 p, while allowing high throughput for a given pressure and area of fabric, with a low requirement for backwashing and energy use. A microstrainer consists of a horizontal rotating drum, typically 1.8 or 3.3 m in diameter and 0.6 - 5.1 m long, covered with fabric mesh panels, which are supplied in aperture grades from 15 to 200 pm, and are about two-thirds immersed in the water to be filtered. Raw water enters the drum at the upstream end and leaves radially through the mesh. Suspended solids are retained on the inner surface and carried upwards to be continuously washed off by washwater jets directed through the mesh from the outside. The rate of formation of the filtration mat is controlled by the drum’s speed of rotation. The dishwater is drawn from the filtered water, and runs under gravity into a trough for disposal. The complete filtration cycle is carried out during one revolution of the drum, and
Fibrotexfiltrationfor Im-Bru Kalsep Ltd has won an important order for its Pibrotex filtration system from Barr Soft Drinks, manufacturer of such well known brands as Tizer and Im-Bru. The AK200 system is to be used to pre-treat feed-water, replacing a conventional multi-media filter system. Pre-treatment of mains water is required by Barr to ensure consistent water quality at all times, and F’ibrotex removes any inconsistencies. The Fibrotex installation is followed by carbon filter, cartridge Elter and ultraviolet sterilisation, helping to guarantee the quality of the company’s products. The AK200 is a highperformance filter with a flow rate of 100 m3/hr in this application. It will remove 98% of particles down to 2 pm, whereas a typical multi-media filter is rated at 98% at lo-20 pm. F’ibrotex is a revolution-
ary depth filter, in which the filter element consists of crimped nylon fibres arranged around a central core. During operation the Ebres are twisted into a helical pattern, and the water to be filtered is passed through the element and ducted away through the central core, leaving the particles attached to the fibres. The element is cleaned periodically by backwashing using treated water, with the fibres being twisted and untwisted in a wringing action. The backwash cycle takes only 4 - 5 min, compared to 30 min for a multi-media filter, and uses a low flow rate and volume. The whole sequence is completely automatic, using a programmable logic controller. Kalsep Lid, Doman Road, York Town Industrial Estate, Camberley, Surrey GlJ15 3DF UK. Tel: +44 CO)276 675675, fax: +44 CO)276 676276.
Burgess-Manning Europe’acquiresSkimovex Burgess-Manning Europe has announced the acquisition of the Skimovex group of companies. The Sklmovex range of wastewater treatment systems expands the company’s capabilities in supplying turnkey packages for the oil, gas, water and associated industries. With offices in Europe,
Asia, the US and agencies worldwide, the acquisition strengthens its position as a leading international process design, engineering and manufacturing group. Burgess-Manning Ltd, Rankin House, West 8&e&, Ware, H&s. SGl2 9EE, UK. Tel: + 44 (0) 920 -44jZ;7?, fax: + 44 [0)920
AgreementbetweenEmonnotand Guedu Emonnot, a French manufacturer of heat-transfer equipment, has announced an industrial and commercial cooperation agreement with French-based Guedu S& in the pharmaceutical, food and cosmetic industries. This agreement is a share participation of Gue-
du in Emonnot capital, and the transfer of production facilities to the Guedu manufacturing plant in Chalonsur-Saone. The new company is called Emonnot Sk
takes from 20 s to 2 min. Weir microstrainers are available in single units to process from 30 to 3900 m3/ hr, and multiple units have been successfully installed
to give throughput 40,000 m3/hr.
Guedu SA, Zone Industrielle, 21140 &nvw-en-Awwis, I+wnce. Tel: + 33 8097 1223, fw: + 33
8097 0758.
up to
W&r Group Plc, 149 Newlands Cathcart, Glasgow 644 4EX, UK Tel: + 44 CO)41 697
Road,
7111,fax:
+44
CO)41 6372221.
289
While appreciating the technical ability of the Bormet equipment, following a practical demonstration at Portrack Treatment Works, other factors influenced the purchase, primarily the ability to use a single belt across 2.8 m, which offers both cost and operational benefits. The single belt concept makes a major contribution to reducing channel construction costs, and presents a larger surface area to maximise filtration. Simple maintenance with front access allows multiple parallel installations. Bonnet Maschinenbau GmbH & Co KG, PosL 148, A@erhalb 24, D-6108 Weiterstadt, Germany. Water-Process Plant Supply Ltd, 64 High SEreet, Edenbridge, Kent ZV8 6AJ, UK Tel: + 44 (0) 732 862974, fax: + 44 (0) 732 863671.
Microstrainersimprovewaterquality An order to supply a waterworks in Germany with microstralners to improve the quality of draining water is among recent successes for the microstrainers department of Weir Pumps. The f400,OOO order is for four machines with washwater pumps, pipework and valves, and including supply, delivery to site, installation and commissioning. The large MS321 machines are for the removal of algae and other solids in the raw water supply, and a smaller MS21 1 is for the recovery of washwater used for cleaning the larger machines. Microstraining is a simple, low-cost form of mechanical fine filtration using woven stainless-steel wire fabric screens with apertures of less than 0.1 mm, and is used to remove microscopic zooplankton, algae or other solids from water or effluent. In practice the particles retained by the fabric build up into a filtration mat, forming a filter finer than the apertures. Weir microstrainers retain solids of Flttratton & Separation
June1993
particle sizes from 16 to 100 p, while allowing high throughput for a given pressure and area of fabric, with a low requirement for backwashing and energy use. A microstrainer consists of a horizontal rotating drum, typically 1.8 or 3.3 m in diameter and 0.6 - 5.1 m long, covered with fabric mesh panels, which are supplied in aperture grades from 15 to 200 pm, and are about two-thirds immersed in the water to be filtered. Raw water enters the drum at the upstream end and leaves radially through the mesh. Suspended solids are retained on the inner surface and carried upwards to be continuously washed off by washwater jets directed through the mesh from the outside. The rate of formation of the filtration mat is controlled by the drum’s speed of rotation. The dishwater is drawn from the filtered water, and runs under gravity into a trough for disposal. The complete filtration cycle is carried out during one revolution of the drum, and
Fibrotexfiltrationfor Im-Bru Kalsep Ltd has won an important order for its Pibrotex filtration system from Barr Soft Drinks, manufacturer of such well known brands as Tizer and Im-Bru. The AK200 system is to be used to pre-treat feed-water, replacing a conventional multi-media filter system. Pre-treatment of mains water is required by Barr to ensure consistent water quality at all times, and F’ibrotex removes any inconsistencies. The Fibrotex installation is followed by carbon filter, cartridge Elter and ultraviolet sterilisation, helping to guarantee the quality of the company’s products. The AK200 is a highperformance filter with a flow rate of 100 m3/hr in this application. It will remove 98% of particles down to 2 pm, whereas a typical multi-media filter is rated at 98% at lo-20 pm. F’ibrotex is a revolution-
ary depth filter, in which the filter element consists of crimped nylon fibres arranged around a central core. During operation the Ebres are twisted into a helical pattern, and the water to be filtered is passed through the element and ducted away through the central core, leaving the particles attached to the fibres. The element is cleaned periodically by backwashing using treated water, with the fibres being twisted and untwisted in a wringing action. The backwash cycle takes only 4 - 5 min, compared to 30 min for a multi-media filter, and uses a low flow rate and volume. The whole sequence is completely automatic, using a programmable logic controller. Kalsep Lid, Doman Road, York Town Industrial Estate, Camberley, Surrey GlJ15 3DF UK. Tel: +44 CO)276 675675, fax: +44 CO)276 676276.
Burgess-Manning Europe’acquiresSkimovex Burgess-Manning Europe has announced the acquisition of the Skimovex group of companies. The Sklmovex range of wastewater treatment systems expands the company’s capabilities in supplying turnkey packages for the oil, gas, water and associated industries. With offices in Europe,
Asia, the US and agencies worldwide, the acquisition strengthens its position as a leading international process design, engineering and manufacturing group. Burgess-Manning Ltd, Rankin House, West 8&e&, Ware, H&s. SGl2 9EE, UK. Tel: + 44 (0) 920 -44jZ;7?, fax: + 44 [0)920
AgreementbetweenEmonnotand Guedu Emonnot, a French manufacturer of heat-transfer equipment, has announced an industrial and commercial cooperation agreement with French-based Guedu S& in the pharmaceutical, food and cosmetic industries. This agreement is a share participation of Gue-
du in Emonnot capital, and the transfer of production facilities to the Guedu manufacturing plant in Chalonsur-Saone. The new company is called Emonnot Sk
takes from 20 s to 2 min. Weir microstrainers are available in single units to process from 30 to 3900 m3/ hr, and multiple units have been successfully installed
to give throughput 40,000 m3/hr.
Guedu SA, Zone Industrielle, 21140 &nvw-en-Awwis, I+wnce. Tel: + 33 8097 1223, fw: + 33
8097 0758.
up to
W&r Group Plc, 149 Newlands Cathcart, Glasgow 644 4EX, UK Tel: + 44 CO)41 697
Road,
7111,fax:
+44
CO)41 6372221.
289