Process sewage from sludge dewatering is particularly suitable for separate partial-flow treatment owing to its highly concentrated components and mostly elevated temperature. The procedures normally foreseen are those offering an effective treatment plant discharge based on a simple operating method and at low cost. With the Store and Treat process developed by Hamburger Stadtentwässerung existing sludge liquor basins can be used for an additional biological partial-flow treatment at reasonable cost without abandoning the advantages of quantity management.

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