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Biogas from blackwater, lawn cuttings and grease trap residues in a district of Hamburg

The research project KREIS focuses on the combination of renewable energy generation, with innovative waste and wastewater management systems. The new system, developed by HAMBURG WASSER is called the 'Hamburg Water Cycle®â€� (HWC) and is actually realized in the Hamburg city quarter 'Jenfelder Auâ€�. HWC contains a separate treatment of greywater and blackwater.

Vacuum toilets are used to concentrate the blackwater. Biogas will be produced from the blackwater by an anaerobic digestion. The daily amount of blackwater will be about 12 m³ (DM: 0.6%; oDM: 63% DM; N: 1.5g/l; P: 0.2g/l). To increase the amount of biogas for energetic utilization co-substrates will be added. Grease trap residues from restaurants and canteens (DM: 5%; oDM: 90% DM; N: 0.1% DM; P: 0.1% DM) are available in large amounts in Hamburg. An inventory study showed, lawn cuttings (DM: 37%; oDM: 78% DM; N: 2.5% DM; P: 0.3% DM) are even available in a sufficient quantity within a 5 km radius around the biogas facility. The lawn cuttings must be pre-treated for wet fermentation firstly. Two options were investigated: preparation of a press juice and maceration into a suspension. Experiments were carried out with various fresh lawn cuttings and silage. Lawn cuttings were collected at several times over the year and the change in composition was investigated. To study the effect of pre-treatment and storage of silage on biogas yields, batch-tests were carried out. The effects of different substrate mixtures, consisting on blackwater, grease trap residues and lawn cuttings of the various types, on biogas yield, retention time and process stability have been studied in continuously operated reactors. The experiments have shown that a stable process (biogas production 800 l/kg oDM) is possible with a mixture of blackwater, lawn cuttings and grease trap residues in a volume ratio of 1:1:1.

Copyright:	© European Compost Network ECN e.V.
Quelle:	Orbit 2014 (Juni 2014)
Seiten:	0
Preis:	€ 0,00
Autor:	Saskia Hertel Stefan Deegener PD Dr. Ing. habil. Ina Körner
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