Implementation of pulp and paper sludge in anaerobic wetdigester : Pilot scale Mobile Biogas plant technology
Hynninen, Pasi (2014)
Hynninen, Pasi
Savonia-ammattikorkeakoulu
2014
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-201501111163
https://urn.fi/URN:NBN:fi:amk-201501111163
Tiivistelmä
The purpose of this thesis was to define the applicability of pulp and paper wastewater in anaerobic digestion process to produce biogas. The implementation was done in a pilot scale with a mobile plant that is built into a sea container. The anaerobic digestion was executed with two reactors in a mesophilic temperature (37 °C). There were laboratory-scale implementation executed simultaneously in Kuopio which was done with the same wastewater source.
Forest industry sludge has unbalanced nutrient content which was countered with extra additive nutrients but without significant results in pilot-scale. With balanced nutrient content the process produces more biogas with higher quality. Unbalanced nutrient content showed high volumes hydrogen sulphide that limits the biogas production. Variation in the quality of the wastewater also caused problems throughout the project making the anaerobic process going overfed and underfed many times.
The gained results are relatively low with piloting implementation approx. 50 – 150 m3 CH4/tVS. The laboratory-scale produced over 300 m3 CH4/tVS with the same wastewater source. The laboratory-scale used a batch of wastewater eliminating variation in wastewater quality that indicates that with a feed tank for wastewater this pilot could easily had higher production results.
Forest industry sludge has unbalanced nutrient content which was countered with extra additive nutrients but without significant results in pilot-scale. With balanced nutrient content the process produces more biogas with higher quality. Unbalanced nutrient content showed high volumes hydrogen sulphide that limits the biogas production. Variation in the quality of the wastewater also caused problems throughout the project making the anaerobic process going overfed and underfed many times.
The gained results are relatively low with piloting implementation approx. 50 – 150 m3 CH4/tVS. The laboratory-scale produced over 300 m3 CH4/tVS with the same wastewater source. The laboratory-scale used a batch of wastewater eliminating variation in wastewater quality that indicates that with a feed tank for wastewater this pilot could easily had higher production results.