Anaerobic Treatment of Waste Water Derived from Hydrothermal Carbonization
| Autor: | Wirth, B., Mumme, J., Erlach, B. |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: | |
| DOI: | 10.5071/20theubce2012-2ao.4.3 |
| Popis: | Hydrothermal carbonization converts biomass into a lignite-like product which has potential applications as a carbon-neutral power plant fuel or as a soil amendment. Since the process takes place in water it is well suited for biomass with a high moisture content, such as organic waste. Most of the feedstock moisture, however, leaves the HTC process as waste water highly loaded with organic and inorganic compounds. Around 10 % of the feedstock energy is contained in the waste water, and treatment requirements may impose an additional energy penalty and high cost. This paper analyzes the feasibility of anaerobic digestion as a treatment step. The produced biogas can be utilized as auxiliary energy in the HTC process, thereby improving its energetic efficiency. Biogas yield, degradability, and long-term stability of the digestion process of HTC waste water were analyzed in an experimental set-up. The HTC liquor showed a fast degradation with 60 % of COD removed within eight days. Methane rates were moderately high with up to 0.65 L gTOC-1. The results were then used for an economic feasibility study of an industrial-scale HTC plant. Incorporation of an anaerobic treatment step seems viable if OLRs of 1.5 kgCOD m-3 d-1 are achievable. Proceedings of the 20th European Biomass Conference and Exhibition, 18-22 June 2012, Milan, Italy, pp. 683-692 |
| Databáze: | OpenAIRE |
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