TECHNOLOGY IN ACTION - ADVERTORIAL


Choosing heat exchangers for viscous wastes & sludges By Arnold Kleijn, Sales Director Europe, HRS Heat Exchangers


Heat exchangers are key components in many processes in the wastewater, anaerobic digestion and waste treatment sectors, including heating, pasteurisation and evaporation.


The high viscosity (a measure of a substance’s resistance to motion under an applied force) of most organic waste streams means that they require more energy to pump and move and often have a higher potential to foul pipework and heat exchangers, reducing heat transfer and operational efficiency.


Corrugated tube heat exchangers, such as those designed and produced by HRS, ensure


that viscous materials can be processed efficiently as the corrugated tube design helps minimise fouling, increasing thermal efficiency during operation, and extending operational periods between cleanings. Where sludge has a relatively low viscosity but contains suspended solids a double-tube heat exchanger, like the HRS DTI Series, is likely to be suitable. In addition, the HRS DTIR Series has a design specifically adapted for energy recovery from low viscosity sludges and features a removeable inner tube to aid cleaning and inspection.


For the most viscous materials scraped surface heat exchangers (SSHEs) are ideal, particularly for evaporation. In most applications, this will involve the HRS Unicus Series, which uses a reciprocating movement to mix the fluid whilst cleaning the heat exchange surface. The separate hydraulic action of the Unicus Series means that the speed of the scrapers makes it particularly suitable for handling and concentrating brines, manures, food waste and wastewater.


There is also a special version of the Unicus Series for evaporation applications specifically designed to concentrate waste streams to concentrations that


traditional evaporation technologies cannot match. This makes it ideal solution for the concentration of environmental waste where volume reduction is vital. Unicus evaporators can be applied in a multi-effect setup or in combination with mechanical vapour recompression. Concentration under vacuum can also be applied with a Unicus evaporator, while the scraped surface operation allows continuous operation and reduces downtime.


As well as the Unicus Series, the HRS Digestate Concentration System (DCS) is also available as a dedicated solution to remove up to 80% of the water content from digestate and sludge, producing a material containing 20% dry solids.


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