Biogas Production from Food Residues—The Role of Trace Metals and Co-Digestion with Primary Sludge
(2020) In Environments- Abstract
- The majority of municipal Wastewater Treatment Plants (WWTPs) in Sweden produce biogas from sewage sludge. In order to increase the methane production, co-digestion of internal sludge with Organic Fraction of Municipal Solid Waste (OFMSW) might be feasible in the future. The objective of this study was therefore to find a beneficial solution for the utilization of OFMSW at the WWTP in Varberg, Sweden. The effects of co-digesting primary sludge (PS) and OFMSW collected in the municipality, in different mixing ratios, were investigated by semi-continuous anaerobic digestion assays. Furthermore, the effects of the addition of a commercial trace elements mixture solution (CTES), available on the market in Sweden, were also examined.... (More)
- The majority of municipal Wastewater Treatment Plants (WWTPs) in Sweden produce biogas from sewage sludge. In order to increase the methane production, co-digestion of internal sludge with Organic Fraction of Municipal Solid Waste (OFMSW) might be feasible in the future. The objective of this study was therefore to find a beneficial solution for the utilization of OFMSW at the WWTP in Varberg, Sweden. The effects of co-digesting primary sludge (PS) and OFMSW collected in the municipality, in different mixing ratios, were investigated by semi-continuous anaerobic digestion assays. Furthermore, the effects of the addition of a commercial trace elements mixture solution (CTES), available on the market in Sweden, were also examined. Co-digestion of OFMSW and PS resulted in specific methane yields of 404, 392, and 375 Nml CH4/g volatile solids (VS), obtained during semi-continuous operations of 301, 357 and 385 days, for the reactors fed with OMFSW:PS ratio of 4:1, 3:1, and 1:1, and at maximum organic loading rates (OLRs) achieved of 4.0, 4.0 and 5.0 gVS/L/d, respectively. Furthermore, mono-digestion of OFMSW failed already at OLR of 1.0 gVS/L/d, however, an OLR of 4.0 gVS/L/d could be achieved with addition of 14 µL/g VS Commercial Trace Element Solutions (CTES) leading to 363 mL CH4/g VS methane production. These experiments were running during 411 days. Hence, higher process efficiency was obtained when using co-digestion of OFMSW and PS compared to that of OFMSW in mono-digestion. Co-digestion is a more feasible option where a balanced Carbon/Nitrogen (C/N) ratio and nutrient supply can be maintained. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/34f35e7a-dadf-4dfe-9c5c-d355a05382d1
- author
- Habagil, Moshe ; Keucken, Alexander LU and Sárvári Horváth, Ilona
- organization
- publishing date
- 2020-05-29
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- co-digestion, process stability, methane production, primary sludge, OFMSW, trace metals
- in
- Environments
- publisher
- MDPI AG
- external identifiers
-
- scopus:85085878514
- ISSN
- 2076-3298
- DOI
- 10.3390/environments7060042
- language
- English
- LU publication?
- yes
- id
- 34f35e7a-dadf-4dfe-9c5c-d355a05382d1
- date added to LUP
- 2020-06-10 14:09:08
- date last changed
- 2022-04-18 22:43:44
@article{34f35e7a-dadf-4dfe-9c5c-d355a05382d1, abstract = {{The majority of municipal Wastewater Treatment Plants (WWTPs) in Sweden produce biogas from sewage sludge. In order to increase the methane production, co-digestion of internal sludge with Organic Fraction of Municipal Solid Waste (OFMSW) might be feasible in the future. The objective of this study was therefore to find a beneficial solution for the utilization of OFMSW at the WWTP in Varberg, Sweden. The effects of co-digesting primary sludge (PS) and OFMSW collected in the municipality, in different mixing ratios, were investigated by semi-continuous anaerobic digestion assays. Furthermore, the effects of the addition of a commercial trace elements mixture solution (CTES), available on the market in Sweden, were also examined. Co-digestion of OFMSW and PS resulted in specific methane yields of 404, 392, and 375 Nml CH4/g volatile solids (VS), obtained during semi-continuous operations of 301, 357 and 385 days, for the reactors fed with OMFSW:PS ratio of 4:1, 3:1, and 1:1, and at maximum organic loading rates (OLRs) achieved of 4.0, 4.0 and 5.0 gVS/L/d, respectively. Furthermore, mono-digestion of OFMSW failed already at OLR of 1.0 gVS/L/d, however, an OLR of 4.0 gVS/L/d could be achieved with addition of 14 µL/g VS Commercial Trace Element Solutions (CTES) leading to 363 mL CH4/g VS methane production. These experiments were running during 411 days. Hence, higher process efficiency was obtained when using co-digestion of OFMSW and PS compared to that of OFMSW in mono-digestion. Co-digestion is a more feasible option where a balanced Carbon/Nitrogen (C/N) ratio and nutrient supply can be maintained.}}, author = {{Habagil, Moshe and Keucken, Alexander and Sárvári Horváth, Ilona}}, issn = {{2076-3298}}, keywords = {{co-digestion; process stability; methane production; primary sludge; OFMSW; trace metals}}, language = {{eng}}, month = {{05}}, publisher = {{MDPI AG}}, series = {{Environments}}, title = {{Biogas Production from Food Residues—The Role of Trace Metals and Co-Digestion with Primary Sludge}}, url = {{http://dx.doi.org/10.3390/environments7060042}}, doi = {{10.3390/environments7060042}}, year = {{2020}}, }