Wastewater pre-treatment in a confectionery industry


Description of the plant

In a first step, wastewater accruing from the production of marzipane is cleaned by a screen. As flow and load to the plant are highly variable depending on the production process an aerated mixing and balancing reactor has been installed to equalise flow and load before final chemical pre-treatment. After adding of chemicals for precipitation and flocculation in special reactors, the wastewater is pre-treated by a dissolved air flotation before given to the municipal sewer net.

Design Data

Waste water: 30m3/h
COD in: 6 000 mg/l
DS in: 75 kg/h
COD out: < 1 250 mg/l
Initial start-up: 1998
Extension: 2003

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