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Microsieving as an innovative technology for the energetic use of sewage

Jahn, Lydia, Haslinger, Julia, Krampe, Jörg, Walder, Christian, Prösl, Andreas, Lahnsteiner, Josef
Österr Wasser- und Abfallw 2017 v.69 no.9-10 pp. 369-377
anaerobic digesters, biodegradation, chemical oxygen demand, energy, phosphorus, sewage, sewage treatment, sieves, tanks
The application of microsieves is an alternative to the construction of primary settling tanks, especially for small sewage treatment plants. The aggregates, mostly designed as drum sieves, restrain the solids and particulate organic materials from the influent and enable the separation of sievings, which can be used as energy source in anaerobic digesters. The following article provides basic information about the design and operation of microsieves, as well as advantages and limitations of this technology. The presented pilot trails with a microsieve provide insights for the feasible removal with regard to the parameters COD, SS and total phosphorus. The results of these experiments confirm that with the use of microsieves more COD and SS can be removed from the influent compared to primary settling tanks. With consideration of the degradability of the sievings, it was possible to estimate the energy production potential. An integrated approach of the removal and biodegradation of the sievings determined in laboratory tests indicate the energy production potential for municipal sewage treatment plants.