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Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 386907
Title Design parameters for sludge reduction in an aquatic worm reactor
Author(s) Hendrickx, T.L.G.; Temmink, B.G.; Elissen, H.J.H.; Buisman, C.J.N.
Source Water Research 44 (2010)3. - ISSN 0043-1354 - p. 1017 - 1023.
Department(s) Environmental Technology
Publication type Refereed Article in a scientific journal
Publication year 2010
Keyword(s) afvalwaterbehandeling - rioolslib - biologische behandeling - lumbricidae - zuurstofconsumptie - waterzuivering - ontwerp - zuiveringsinstallaties - slibzuivering - aquatische wormen - waste water treatment - sewage sludge - biological treatment - lumbricidae - oxygen consumption - water treatment - design - purification plants - sludge treatment - aquatic worms - lumbriculus-variegatus muller - eating waste sludge - minimization
Categories Waste Water Treatment
Abstract Reduction and compaction of biological waste sludge from waste water treatment plants (WWTPs) can be achieved with the aquatic worm Lumbriculus variegatus. In our reactor concept for a worm reactor, the worms are immobilised in a carrier material. The size of a worm reactor will therefore mainly be determined by the sludge consumption rate per unit of surface area. This design parameter was determined in sequencing batch experiments using sludge from a municipal WWTP. Long-term experiments using carrier materials with 300 and 350 µm mesh sizes showed surface specific consumption rates of 45 and 58 g TSS/(m2 d), respectively. Using a 350 µm mesh will therefore result in a 29% smaller reactor compared to using a 300 µm mesh. Large differences in consumption rates were found between different sludge types, although it was not clear what caused these differences. Worm biomass growth and decay rate were determined in sequencing batch experiments. The decay rate of 0.023 d-1 for worms in a carrier material was considerably higher than the decay rate of 0.018 d-1 for free worms. As a result, the net worm biomass growth rate for free worms of 0.026 d-1 was much higher than the 0.009–0.011 d-1 for immobilised worms. Finally, the specific oxygen uptake rate of the worms was determined at 4.9 mg O2/(g ww d), which needs to be supplied to the worms by aeration of the water compartment in the worm reactor
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