GEA 2H polypropylene fills for clean water around the world
08. July 2015 At WEFTEC in Chicago, GEA Heat Exchangers will present exciting, extensive offerings of polypropylene (PP) fill packs for treatment of wastewater. At this leading trade fair in the US for water and wastewater treatment, visitors will see an assortment of model options from the 2H BIOdek® range of PP fills, and from the 2H TUBEdek® range of tube settlers (lamella separators), both designed for a variety of applications.
The advantages of PP fills over alternatives made of PVC have been recognized throughout the world for treatment of wastewater. 2H BIOdek® fills made of PP are not only lighter, more stable in form, and more resistant to erosion than are alternatives with the same thickness made of PVC – they are also more environmentally friendly, starting with production. The PP sheets are thermo-welded, with no need for solvents in production – pollutants that are absolutely necessary for the bonding of PVC. Disposal of used fill packs is likewise unproblematic, since PP, as a pure hydrocarbon compound, emits no toxic substances such as dioxin or hydrochloric acid when incinerated under controlled conditions.
PP is more elastic and more stable to pressure than is PVC – benefits that are scientifically measureable. A PP block and a PVC block, each with a density of 35 kg/m³ and with a corrugation height of 19 mm, have been compared in testing. Both the mechanical compressive strength as well as the mean sheet thickness are greater with PP. The connection technique for PP also contributes to its greater stability and robustness. PP welding techniques developed by GEA Heat Exchangers, which feature approx. 10,000 weld spots per m², assure permanent connection of the individual PP sheets with each other.
The sum of these properties has the consequence, for example, that trickling filters made of PP fills provide a surface stable enough for service staff to walk over for maintenance purposes – without damaging their structure. A comparable installation made of PVC, on the other hand, requires a catwalk grating for maintenance, and at the same time has the disadvantage of being heavier, less flexible, and thinner: which increases the risk of structural collapse during facility operation.
Throughout the world, more and more facility operators are counting on PP fill packs. Recently, for example, GEA Heat Exchangers received an order to equip a sewage treatment plant in Addis Ababa (Ethiopia) with 2H BIOdek® fills made of PP. The facility will have a capacity to serve more than one million residents. This project for Kaliti, one of the sub-cities of Addis Ababa, has been financed by the World Bank and will supplement the existing wastewater ponds by addition of a biological treatment stage.
GEA Heat Exchangers at WEFTEC in Chicago, stand 2240, September 26 to 30, 2015
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