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4. Anwendung in der Lebensmittelindustrie

Author

Lange, Roland, Austermann-Haun, Ute, Rosenwinkel, Karl-Heinz, Abeling, Ulrike, Hartwig, Peter, Barjenbruch, Matthias, Steinke, Manja, Saake, Michael, Althoff, Friedrich, Lebek, Martin, Krüger, Matthias, Jördening, Hans-Joachim, Kroiss, Helmut, Svardal, Karl, Wilkening, Ludz, Borchmann, Axel, Finke, Reinhard, Hinken, Linda, Trautmann, Niklas, Carozzi, Alvaro, Kraushaar, Dieter, Ristow, Robert, Rosenwinkel, Karl-Heinz, editor, Kroiss, Helmut, editor, Dichtl, Norbert, editor, Seyfried, Carl-Franz, editor, and Weiland, Peter, editor

Published
2015
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6. Grundlagen anaerober Prozesse

Author

Gallert, Claudia, Winter, Josef, Svardal, Karl, Rosenwinkel, Karl-Heinz, editor, Kroiss, Helmut, editor, Dichtl, Norbert, editor, Seyfried, Carl-Franz, editor, and Weiland, Peter, editor

Published
2015
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17. Effect of NH3 and organic loading on the inhibition of mesophilic high‐solid digestion.

Author

Jahn, Lydia, Baumgartner, Thomas, Krampe, Jörg, and Svardal, Karl

Subjects
TOTAL suspended solids, CHEMICAL oxygen demand, CHEMICAL industry, DIGESTION, ANAEROBIC bacteria, CONSTRUCTION costs
Abstract

BACKGROUND: The construction of small digesters will become more important for regions with demographic increase and limited areas. Savings of digester volume and a subsequently smaller footprint can be realized by the treatment of a more thickened raw sludge (high‐solid digestion). However, this operation can lead to instabilities of the anaerobic process due to rising ammonium and ammonia levels. The aim of the study was to identify the limit of saving digester volume by increasing the total suspended solids (TSS) of the treated raw sludge. RESULTS: The effects of high TSS and ammonia levels in the digested sludge were investigated in lab‐scale reactors. Ammonium nitrogen (NH4‐N) levels were set by dosing a urea solution as well as by feeding a higher concentrated raw sludge. Chemical oxygen demand (COD) removal declined from 64 to 54% with NH4‐N levels rising from 2000 to 3200 mg L−1. However, the anaerobic biodegradation was not completely interrupted, which indicates the possible adaptation of anaerobic bacteria on high NH4‐N levels. CONCLUSION: From the results, it can be concluded that dewatering the raw sludge up to 7% TSS leads to an optimum benefit with maximum savings in digester volume. The benefits of the operation with high solids are a lower energy demand for heating up the raw sludge and reduced construction costs (−20%) due to smaller required digester volumes. © 2019 The Authors. Journal of Chemical Technology & Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry. [ABSTRACT FROM AUTHOR]

Published
2020
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21. Anaerobic biodegradation and dewaterability of aerobic granular sludge

Author

Karl Svardal, Lydia Jahn, Jörg Krampe, Ernis Saracevic, Jahn, Lydia, Saracevic, Ernis, Svardal, Karl, and Krampe, Jorg

Subjects
anaerobic digestion, General Chemical Engineering, 02 engineering and technology, 010501 environmental sciences, 01 natural sciences, biodegradation, Inorganic Chemistry, Extracellular polymeric substance, Biogas, biogas, sewage, Waste Management and Disposal, SBR, 0105 earth and related environmental sciences, AGS, Renewable Energy, Sustainability and the Environment, Chemistry, Organic Chemistry, Biodegradation, 021001 nanoscience & nanotechnology, Pulp and paper industry, Pollution, Anaerobic digestion, Fuel Technology, Activated sludge, Volatile suspended solids, Sewage treatment, 0210 nano-technology, Anaerobic exercise, Biotechnology
Abstract

BACKGROUND: Although a growing number of full-scale wastewater treatment plants have already been constructed and operated with aerobic granular sludge (AGS), only limited information is available about further post-treatment, in particular about sludge stabilization and dewaterability. The aim of the present study was to investigate the biodegradation and methane yield of AGS by the use of anaerobic laboratory-scale reactors operated under mesophilic conditions and hydraulic retention times of 25 and 40 days. RESULTS: The methane yield of AGS was ca 260 mL gVSS−1 (volatile suspended solids) and thus slightly increased compared to that of suspended activated sludge (SAS; 240 mL gVSS−1). A clear difference between the methane yield was found for separated pure granules (500 μm), which was ca 50% higher compared to that for SAS. VSS removal of AGS during anaerobic degradation was ca 52%. Dewaterability of AGS after anaerobic digestion was slightly lower compared to SAS. Extracellular polymeric substance (EPS) extraction and fluorescence analysis showed tryptophan contents which were almost twice as high compared to the EPS extracted from SAS. CONCLUSIONS: Overall, the anaerobic digestion of AGS was found to be a suitable stabilization strategy with the benefit of recovering energy in the form of methane. Further tests are needed to validate the decreased dewatering behaviour with full-scale applications. The presented approach for tryptophan measurement allows the transfer of qualitative results from a fluorescence analysis into quantitative values and could be further adapted for identifying relevant EPS constituents. © 2019 The Authors. Journal of Chemical Technology & Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry. Refereed/Peer-reviewed

Published
2019

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