PC-SEP22-PG29.1_Layout 1 12/09/2022 09:49 Page 29


SOLIDS & FLUIDS PROCESSING SPIRAL CONVEYORS FOR WET AND DRY SLUDGE


SPIRAC’s conveyors are keeping sludge on the move at a plant in Egypt


moving sludge to and from the sludge drying areas. The $739M (£609M), 5.6 million m3


A


t what is now the world’s largest water treatment plant, SPIRAC has supplied 2km (1.24 miles) of shaftless spiral conveyors for


/day Bahr El-


Baqar plant will benefit from 32 inclined SPIROLIFT (OK) conveyors for dried sludge, plus a further 32 inclined SPIROLINE (U) conveyors for wet sludge. Handling 490,000 ton/year of dry sludge (at


drying level 24%) and 165,000 ton/year of dry sludge (at drying level 75%), the shaftless SPIRAC conveyors offer less wear and reduced energy usage compared to shafted spirals. SPIROLIFT vertical conveyors feature an


octagonal trough and liner with breaks included. These provide a key resistance point, which helps to prevent slippery materials from forming a rotating plug. Its innovative design encourages the material to move vertically


HOSE REPLACEMENT HELPS CUT LIFETIME COSTS


increase reliability of ‘requeijão’ production. Due to its soft texture, the cream cheese is pumped through filling nozzles into 250ml glass jars at the dairy’s filling area. Until recently, the filling process was utilising an established brand of food-grade EPDM


A


rubber hose assemblies for this filling line. However, the dynamic, rapid and repetitive filling action, together with daily clean-in-place (CIP), resulted in these hose assemblies not standing up to the rigors of the application. The customer said the hoses were rupturing internally, particularly in the areas where the end-fittings were crimped into the hoses. This meant that hose assembly changeouts were required at four to six month intervals, which was costly in terms of both hose replacement, and associated production stoppages and maintenance. WMFTG Brazil Sales Engineer Raphael Zaupa suggested that the customer install Aflex FDA


certified Pharmaline N hose, which has a fully CIP resistant PTFE internal liner. The Aflex hose offers more than 15 times the flex-life of competitor hose products and a greater resistance to kinking. The customer also benefits from Aflex’s 24 month manufacturer’s warranty as standard. The customer did admit that the Aflex product’s upfront price was higher than the competitor proposal; however once he understood the lifetime cost savings, he realised that within 18 months he would be saving money on direct hose costs alone. Once indirect costs such as maintenance and production stoppages are also considered, the Aflex solution is a better


value product choice. WMFTS


www.wmfts.com


national dairy company in Brazil is now using Aflex Pharmaline N hoses in their production of a classic national cheese. The hoses produced by Aflex Hose, part of Watson-Marlow Fluid Technology Solutions, are being used to cut lifetime costs and


with the spiral face. Meanwhile, the SPIROLINE horizontal


conveyors feature a U-trough with a low RPM shaftless spiral riding on a special low friction long life trough liner. Aimed at developing the Sinai Peninsula to


maximise its natural resources, Bahr El-Baqar (a joint venture between Arab Contractors (Arabco) and Orascom Construction) will contribute to the reclamation of 400,000 feddans (approximately 415,000 acres) by recycling and using agricultural, industrial and sewage wastewater. This will be diverted from the western to the eastern bank under the Suez Canal. Upon treatment, all water will be dispensed in Sheikh Jaber’s Canal. Bahr El- Baqar will provide much-needed water to irrigate more than 168,000 hectares of plantations in Sinai. In the first phase of sludge collection,


sedimentary solids are transferred from sedimentation tanks to sludge thickening tanks. For sludge thickening (the second phase), the sludge moves to stabilisation and thickening to obtain a thicker sludge. This is followed by dewatering and a mechanical drying phase to have a higher dry rate of up to 24%. 32 inclined SPIROLINE (U conveyors) transport the sludge to the sludge drying beds. In the third and final phase (solar drying),


dry sludge at a drying level of 75% is conveyed by 32 SPIROLIFT (OK) conveyors from the solar drying beds. These biosolids have multiple uses, including as fertilizer and in construction applications.


SPIRAC www.spirac.com


SEPTEMBER 2022 | PROCESS & CONTROL 29


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68  |  Page 69  |  Page 70