- Email: [email protected]
Primary effluent treatment order
Primary effluent treatment order An order worth over £0.25m has been won by Krofta Engineering to engineer and supply the primary effluent treatment system for Kimberley-Clark Service and Industrial Sector, Europe, a soft tissue and nonwoven product manufacturer. The equipment, to be installed in the new recycled fibre tissue line at the company's Coleshill Mill in Flint, Clwyd, North Wales, will start up early next year. The Krofta ~";' ' S u p r a c e l l ' clarification system utilises a combination of settling and dissolved air flotation techniques. A compact and efficient design has been made possible by using the zero velocity principle. The system is said to be advantageous for situations where the sludge or clarified water is recycled to the process; its small volume and short retention times being critical factors for this type of operation.
Krofta Engineering Ltd. Ty-Coed, Llanarmon-yn-lal. Mold, Clyd CH7 4QN.
Largest thickeners for Indonesia Two 28m diameter high rate t h i c k e n e r s were r e c e n t l y ordered by PT Kelian Equatorial Mining of Indonesia from Supaflo Technologies for the Kelian Gold Project located in the foothills of the Central Kalimantan range on the Kelian river in the province of East Kalimantan. Equipment for the project will be shipped through the coastal city of Samarinda, approximately 200km south of the mine, and then by barge and road to site.
Extensive testwork was conducted in Supaflo's Sydney and Perth laboratories on samples of milled and leached ore to determine the size of the thickeners required for the installation. Testwork carried out by Supaflo showed that it was necessary to dilute both the oxide and primary ore s a m p l e s from an SG of approximately 1.33 to 1.07 to obtain satisfactory flocculation and good underflow densities at reasonable flocculant dosages. The ore contained significant quantities of clay making it difficult to flocculate and settle. The feed rate to the two thickeners will be 975t/h of oxide ore or 780tih of primary ore at a pulp SG of 1.34. Feed slurry will be diluted using Supaflo's patented Autodil system to an SG of 1.07 prior to addition of flocculant, to produce an underflow with an SG of approximately 1.53. The thickeners for Kelian will, it is thought, be the largest genuine high rate thickeners installed in Australasia and South East Asia and amongst the largest installed anywhere in the world. Shown are the test facilities used in Kelian.
Supaflow Technologies Pty Ltd. 114 Roseberry Ave, Balgowlah NSW 2097, Australia.
Medical membrane plant completed The construction phase of a £9m 103,000ft 2 health care factory at St Column, nr Newquay, has been completed for Pall Newquay, the first investment made by Pall Corp outside the USA in the basic manufacturing processes of the membranes used in health care devices and filters. At the plant will be manufactured state-of-the-art m i c r o p o r o u s plastic membranes and health care products used in market areas ranging from open heart surgery and d i a g n o s t i c s to breathing and intravenous filters. Up to now, this range of products has been manufactured by the company only in the USA. The company expects the number of employees at St Columb to increase to 250 as the plant builds up its manufacturing output, and the Cornwall area is already benefiting from the company's use of local products and services. The development has been designed to blend into the rural landscape. The building contains fully environmentally controlled clean rooms and production areas.
Pail Europe Ltd, Europa House, Havant Street, Portsmouth PO13PD.
Advantages of chlorine dioxide for water Using chlorine dioxide for water disinfection instead of chlorine can have many advantages, according to Degussa. Chlorine and its compound hypochlorite were the agents traditionally used in the disinfection of drinking water - until it emerged that they form halogenated hydrocarbons, which constitute a health hazard. This is one reason why the level of such organic halogen compounds (AOX) has been limited to 100pgqsince 1989 by German effluent legislation. Chlorine dioxide is said to have now largely supplanted both chlorine and hypochlorite, as chlorine dioxide possesses a number of uncontestable advantages. It is obtained by various means from sodium chlorite produced by Degussa. Unlike chlorine, whose disinfectant properties dwindle rapidly as its pH value rises, the effectiveness of chlorine dioxide remains largely constant in the pH range of 6 to 9. Furthermore, chlorine dioxide disinfects much more rapidly, It can also be used to disinfect substances, germs, spores and viruses which are resistant to chlorine. Chlorine dioxide does not generate harmful trihalomethanes (THM, haloforms), and the occurrence of other higher-molecular halogen compounds which can be absorbed by activated carbon is drastically reduced. Undesirablechlorine compounds such as the highly pungent chlorophenols (the typical pharmacy smell) which may occur during the chlorination process are not generated when chlorine dioxide is used. This substance does not react either with ammonia, which is generated when protein compounds are broken down microbially, or with amino compounds, but it does destroy iron and manganesecomplexes. In particular, lasting bactericidal and bacteriostatic protection of the pipe system can be observed, even resulting in the elimination of microbial deposits. Chlorine dioxide is a compound of chlorine and oxygen which cannot be stored for chemo-physical reasons. It is therefore manufactured reliably and in controlled conditions in the form of an aqueous chlorine dioxide solution in suitable plants. The solution is obtained directly at the point of application from Degussasodium chlorite 300W according to various processes Degussa claims to possess considerable experience in applying the chlorite, chlorine method and the chlorite/hydrochloric acid method.
Degussa AG, Postfach 110533,D-6000. Frankfurt II, WestGermany.
386
November:December 1990
Filtration & Separation
Krofta Engineering Ltd. Ty-Coed, Llanarmon-yn-lal. Mold, Clyd CH7 4QN.
Largest thickeners for Indonesia Two 28m diameter high rate t h i c k e n e r s were r e c e n t l y ordered by PT Kelian Equatorial Mining of Indonesia from Supaflo Technologies for the Kelian Gold Project located in the foothills of the Central Kalimantan range on the Kelian river in the province of East Kalimantan. Equipment for the project will be shipped through the coastal city of Samarinda, approximately 200km south of the mine, and then by barge and road to site.
Extensive testwork was conducted in Supaflo's Sydney and Perth laboratories on samples of milled and leached ore to determine the size of the thickeners required for the installation. Testwork carried out by Supaflo showed that it was necessary to dilute both the oxide and primary ore s a m p l e s from an SG of approximately 1.33 to 1.07 to obtain satisfactory flocculation and good underflow densities at reasonable flocculant dosages. The ore contained significant quantities of clay making it difficult to flocculate and settle. The feed rate to the two thickeners will be 975t/h of oxide ore or 780tih of primary ore at a pulp SG of 1.34. Feed slurry will be diluted using Supaflo's patented Autodil system to an SG of 1.07 prior to addition of flocculant, to produce an underflow with an SG of approximately 1.53. The thickeners for Kelian will, it is thought, be the largest genuine high rate thickeners installed in Australasia and South East Asia and amongst the largest installed anywhere in the world. Shown are the test facilities used in Kelian.
Supaflow Technologies Pty Ltd. 114 Roseberry Ave, Balgowlah NSW 2097, Australia.
Medical membrane plant completed The construction phase of a £9m 103,000ft 2 health care factory at St Column, nr Newquay, has been completed for Pall Newquay, the first investment made by Pall Corp outside the USA in the basic manufacturing processes of the membranes used in health care devices and filters. At the plant will be manufactured state-of-the-art m i c r o p o r o u s plastic membranes and health care products used in market areas ranging from open heart surgery and d i a g n o s t i c s to breathing and intravenous filters. Up to now, this range of products has been manufactured by the company only in the USA. The company expects the number of employees at St Columb to increase to 250 as the plant builds up its manufacturing output, and the Cornwall area is already benefiting from the company's use of local products and services. The development has been designed to blend into the rural landscape. The building contains fully environmentally controlled clean rooms and production areas.
Pail Europe Ltd, Europa House, Havant Street, Portsmouth PO13PD.
Advantages of chlorine dioxide for water Using chlorine dioxide for water disinfection instead of chlorine can have many advantages, according to Degussa. Chlorine and its compound hypochlorite were the agents traditionally used in the disinfection of drinking water - until it emerged that they form halogenated hydrocarbons, which constitute a health hazard. This is one reason why the level of such organic halogen compounds (AOX) has been limited to 100pgqsince 1989 by German effluent legislation. Chlorine dioxide is said to have now largely supplanted both chlorine and hypochlorite, as chlorine dioxide possesses a number of uncontestable advantages. It is obtained by various means from sodium chlorite produced by Degussa. Unlike chlorine, whose disinfectant properties dwindle rapidly as its pH value rises, the effectiveness of chlorine dioxide remains largely constant in the pH range of 6 to 9. Furthermore, chlorine dioxide disinfects much more rapidly, It can also be used to disinfect substances, germs, spores and viruses which are resistant to chlorine. Chlorine dioxide does not generate harmful trihalomethanes (THM, haloforms), and the occurrence of other higher-molecular halogen compounds which can be absorbed by activated carbon is drastically reduced. Undesirablechlorine compounds such as the highly pungent chlorophenols (the typical pharmacy smell) which may occur during the chlorination process are not generated when chlorine dioxide is used. This substance does not react either with ammonia, which is generated when protein compounds are broken down microbially, or with amino compounds, but it does destroy iron and manganesecomplexes. In particular, lasting bactericidal and bacteriostatic protection of the pipe system can be observed, even resulting in the elimination of microbial deposits. Chlorine dioxide is a compound of chlorine and oxygen which cannot be stored for chemo-physical reasons. It is therefore manufactured reliably and in controlled conditions in the form of an aqueous chlorine dioxide solution in suitable plants. The solution is obtained directly at the point of application from Degussasodium chlorite 300W according to various processes Degussa claims to possess considerable experience in applying the chlorite, chlorine method and the chlorite/hydrochloric acid method.
Degussa AG, Postfach 110533,D-6000. Frankfurt II, WestGermany.
386
November:December 1990
Filtration & Separation