Biological production of hydrogen by fermentation in batch and discontinuous tests

Laboratory scale thermophilic fermentation tests were carried out in three different test systems (500 ml Sensomat system, 6 l anaerobic test system (ATS) and a 30 l continuously stirred tank reactor CSTR). Hydrogen was produced from glucose and agricultural products as substrates in batch and discontinuous tests at 60°C. The inoculum consisted of heat-treated digested sewage sludge containing a natural mixed culture. The best specific hydrogen production of 280 Nml H2/g VSS (conversion 112 %) was achieved with glucose at a pH 5.5 in batch operation in the CSTR. Corn starch produced 211 Nml H2/g VSS (conversion 75 %) and potato starch 123 Nml H2/g VSS (conversion 45 %). The agricultural products sugar beet (192 Nml H2/g VSS, 70 %) and fodder beet (185 Nml H2/g VSS, 65 %) also showed good potential for biological hydrogen production. In addition, the fermentation of potato, turnip, corn and bio-waste potato peel resulted in promising hydrogen production rates with conversion yields of 60 %, 50 %, 49 % and 30 %, respectively. In the discontinuous test system, hydrogen production rates of between 0.4 Nl/(lR·d) and 1.3 Nl/(lR·d) were produced, corresponding to yields of between 83 to 445 Nml H2/g VSS.

 

 

Hochlauf der Wasserstoffwirtschaft
© Lexxion Verlagsgesellschaft mbH (8/2024)
Überblick über und Diskussion der Maßnahmen zum beschleunigten Ausbau der Wasserstoffinfrastruktur in Deutschland

Die innerstaatliche Umsetzung des Pariser Klimaschutzübereinkommens - ein Rechtsvergleich
© Lexxion Verlagsgesellschaft mbH (8/2024)
Like all public international law treaties, the Paris Climate Accords rely on national law for their implementation. The success of the agreement therefore depends, to a large extent, on the stepstaken or not taken by national governments and legislators as well as on the instruments and mechanisms chosen for this task. Against this background, the present article compares different approaches to the implementation of the Paris Agreement, using court decisions as a means to assess their (legal) effectiveness.

Klimaschutzrecht und Erzeugung erneuerbarer Energien in der Schweiz
© Lexxion Verlagsgesellschaft mbH (8/2024)
Verschachtelte Gesetzgebung unter politischer Ungewissheit

 

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