Characteristics of Biogas Production from Organic Wastes Mixed at Optimal Ratios in an Anaerobic Co-Digestion Reactor
This study determined the optimal mixing ratio of food waste and livestock manure for efficient co-digestion of sewage sludge by applying the biochemical methane potential (BMP) test, Design Expert software, and continuous reactor operation. The BMP test of sewage sludge revealed a maximum methane y...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-10-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/14/20/6812 |
| _version_ | 1797514662997131264 |
|---|---|
| author | Young-Ju Song Kyung-Su Oh Beom Lee Dae-Won Pak Ji-Hwan Cha Jun-Gyu Park |
| author_facet | Young-Ju Song Kyung-Su Oh Beom Lee Dae-Won Pak Ji-Hwan Cha Jun-Gyu Park |
| author_sort | Young-Ju Song |
| collection | DOAJ |
| description | This study determined the optimal mixing ratio of food waste and livestock manure for efficient co-digestion of sewage sludge by applying the biochemical methane potential (BMP) test, Design Expert software, and continuous reactor operation. The BMP test of sewage sludge revealed a maximum methane yield of 334 mL CH<sub>4</sub>/g volatile solids (VS) at an organic loading rate (OLR) of 4 kg VS/(m<sup>3</sup>·d). For food waste, the maximum methane yield was 573 mL CH<sub>4</sub>/g VS at an OLR of 6 kg VS/(m<sup>3</sup>·d). Livestock manure showed the lowest methane yield. The BMP tests with various mixing ratios confirmed that a higher mixing ratio of food waste resulted in a higher methane yield, which showed improved biodegradability and an improved VS removal rate. The optimal mixing ratio of 2:1:1 for sewage sludge, food waste, and livestock manure was determined using Design Expert 10. Using continuous co-digestion reactor operation under an optimal mixing ratio, greater organic matter removal and methane yield was possible. The process stability of co-digestion of optimally mixed substrate was improved compared with that of operations with each substrate alone. Therefore, co-digestion could properly maintain the balance of each stage of anaerobic digestion reactions by complementing the characteristics of each substrate under a higher OLR. |
| first_indexed | 2024-03-10T06:34:47Z |
| format | Article |
| id | doaj.art-80ae466dc7e948c0a1c812ba39ec976e |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T06:34:47Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-80ae466dc7e948c0a1c812ba39ec976e2023-11-22T18:09:11ZengMDPI AGEnergies1996-10732021-10-011420681210.3390/en14206812Characteristics of Biogas Production from Organic Wastes Mixed at Optimal Ratios in an Anaerobic Co-Digestion ReactorYoung-Ju Song0Kyung-Su Oh1Beom Lee2Dae-Won Pak3Ji-Hwan Cha4Jun-Gyu Park5Department of Environmental Energy Engineering Graduate School of Convergence Science, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul 01811, KoreaDepartment of Environmental Energy Engineering Graduate School of Convergence Science, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul 01811, KoreaNature Engineering Co., Ltd., E-9, 1 Chungdae-ro, Seowon-gu, Cheongju-si 28644, Chungcheongbuk-do, KoreaDepartment of Environmental Energy Engineering Graduate School of Convergence Science, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul 01811, KoreaDepartment of Environmental Engineering, Chungbuk National University, Cheongju-si 28644, Chungcheongbuk-do, KoreaDepartment of Advanced Energy Engineering, Chosun University, 309 Pilmun-daero, Dong-gu, Gwangju 61452, KoreaThis study determined the optimal mixing ratio of food waste and livestock manure for efficient co-digestion of sewage sludge by applying the biochemical methane potential (BMP) test, Design Expert software, and continuous reactor operation. The BMP test of sewage sludge revealed a maximum methane yield of 334 mL CH<sub>4</sub>/g volatile solids (VS) at an organic loading rate (OLR) of 4 kg VS/(m<sup>3</sup>·d). For food waste, the maximum methane yield was 573 mL CH<sub>4</sub>/g VS at an OLR of 6 kg VS/(m<sup>3</sup>·d). Livestock manure showed the lowest methane yield. The BMP tests with various mixing ratios confirmed that a higher mixing ratio of food waste resulted in a higher methane yield, which showed improved biodegradability and an improved VS removal rate. The optimal mixing ratio of 2:1:1 for sewage sludge, food waste, and livestock manure was determined using Design Expert 10. Using continuous co-digestion reactor operation under an optimal mixing ratio, greater organic matter removal and methane yield was possible. The process stability of co-digestion of optimally mixed substrate was improved compared with that of operations with each substrate alone. Therefore, co-digestion could properly maintain the balance of each stage of anaerobic digestion reactions by complementing the characteristics of each substrate under a higher OLR.https://www.mdpi.com/1996-1073/14/20/6812sewage sludgefood wastelivestock manureanaerobic co-digestionmixing ratio |
| spellingShingle | Young-Ju Song Kyung-Su Oh Beom Lee Dae-Won Pak Ji-Hwan Cha Jun-Gyu Park Characteristics of Biogas Production from Organic Wastes Mixed at Optimal Ratios in an Anaerobic Co-Digestion Reactor Energies sewage sludge food waste livestock manure anaerobic co-digestion mixing ratio |
| title | Characteristics of Biogas Production from Organic Wastes Mixed at Optimal Ratios in an Anaerobic Co-Digestion Reactor |
| title_full | Characteristics of Biogas Production from Organic Wastes Mixed at Optimal Ratios in an Anaerobic Co-Digestion Reactor |
| title_fullStr | Characteristics of Biogas Production from Organic Wastes Mixed at Optimal Ratios in an Anaerobic Co-Digestion Reactor |
| title_full_unstemmed | Characteristics of Biogas Production from Organic Wastes Mixed at Optimal Ratios in an Anaerobic Co-Digestion Reactor |
| title_short | Characteristics of Biogas Production from Organic Wastes Mixed at Optimal Ratios in an Anaerobic Co-Digestion Reactor |
| title_sort | characteristics of biogas production from organic wastes mixed at optimal ratios in an anaerobic co digestion reactor |
| topic | sewage sludge food waste livestock manure anaerobic co-digestion mixing ratio |
| url | https://www.mdpi.com/1996-1073/14/20/6812 |
| work_keys_str_mv | AT youngjusong characteristicsofbiogasproductionfromorganicwastesmixedatoptimalratiosinananaerobiccodigestionreactor AT kyungsuoh characteristicsofbiogasproductionfromorganicwastesmixedatoptimalratiosinananaerobiccodigestionreactor AT beomlee characteristicsofbiogasproductionfromorganicwastesmixedatoptimalratiosinananaerobiccodigestionreactor AT daewonpak characteristicsofbiogasproductionfromorganicwastesmixedatoptimalratiosinananaerobiccodigestionreactor AT jihwancha characteristicsofbiogasproductionfromorganicwastesmixedatoptimalratiosinananaerobiccodigestionreactor AT jungyupark characteristicsofbiogasproductionfromorganicwastesmixedatoptimalratiosinananaerobiccodigestionreactor |