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Onsite incineration of sewage sludge to be demonstrated

By Gerald Ondrey |

Incineration is becoming the only viable method for sewage sludge disposal as landfilling or spreading sludge onto farmland is no longer permitted in some countries. Today, sludge is commonly incinerated in large, centralized incinerators or as an additive in coal-fired power plants or cement kilns. An alternative to these costly and inconvenient options — small, localized incinerators — has been developed by Huber SE (Berching, Germany; http://www.huber.de), in cooperation with partners in a three-year project supported under the European Commission’s Life program. The new incinerators are based on Huber’s sludge2energy process (flowsheet). Sludge is first pre-dried in a belt dryer to a solids concentration of up to 90% by blowing hot (90°C) air through the belts. The cooled air is reheated with heat recovered from the incinerator and recirculated through the dryer. A slight underpressure is maintained in the dryer to prevent the release of air, vapors and odors. Dried sludge is then conveyed to a small furnace. The hot fluegas from the furnace passes through a heat recuperator that transfers the heat to compressed ambient air, which drives a micro gas turbine and electricity generator. Even small…
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Caprolactam Genomatica (San Diego, Calif.; www.genomatica.com) recently announced the production of the world’s first renewably sourced ton of caprolactam, the…

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