1
|
Choudhury AR, Singh N, Lalwani J, Srinivasan H, Palani SG. Enhancing biomethanation performance through co-digestion of diverse organic wastes: a comprehensive study on substrate optimization, inoculum selection, and microbial community analysis. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:34622-34646. [PMID: 38709410 DOI: 10.1007/s11356-024-33557-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Accepted: 04/29/2024] [Indexed: 05/07/2024]
Abstract
A blend of organic municipal solid waste, slaughterhouse waste, fecal sludge, and landfill leachate was selected in different mixing ratios to formulate the best substrate mixture for biomethanation. Individual substrates were characterized, and the mixing ratio was optimized with the help of a response surface methodology tool to a value of 1:1:1:1 (with a C/N ratio of 28±0.769 and total volatile fatty acid (VFA) concentration of 2500±10.53 mg/L) to improve the overall biomethanation. The optimized blend (C/N ratio: 28.6, VFA: 2538 mg/L) was characterized for physicochemical, biological, and microbial properties and subjected to anaerobic digestion in lab-scale reactors of 1000 mL capacity with and without the addition of inoculum. The biogas yield of individual substrates and blends was ascertained separately. The observed cumulative biogas yield over 21 days from the non-inoculated substrates varied between 142±1.95 mL (24.6±0.3 ml/gVS) and 1974.5±21.72 mL (270.4±3.1 ml/gVS). In comparison, the addition of external inoculation at a 5% rate (w/w) of the substrate uplifted the minimum and maximum cumulative gas yield values to 203±9.9 mL (35.0±1.6 mL/gVS) and 3394±13.4 mL (315.3±1.2 mL/gVS), respectively. The inoculum procured from the Defence Research and Development Organisation (DRDO) was screened in advance, considering factors such as maximizing VFA production and consumption rate, biogas yield, and digestate quality. A similar outcome regarding biogas yield and digestate quality was observed for the equivalent blend. The cumulative gas yield increased from 2673±14.5 mL (373.7±2.2 mL/gVS) to 4284±111.02 mL (391.47±20.02 mL/gVS) over 21 days post-application of a similar dosage of DRDO inoculum. The 16S rRNA genomic analysis revealed that the predominant bacterial population belonged to the phylum Firmicutes, with the majority falling within the orders Clostridiales and Lactobacillales. Ultimately, the study advocates the potential of the blend mentioned above for biomethanation and concomitant enrichment of both biogas yield and digestate quality.
Collapse
Affiliation(s)
- Atun Roy Choudhury
- Cube Bio Energy Pvt. Ltd., Madhapur, Hyderabad, Telangana, 500081, India
- Department of Biological Sciences, Birla Institute of Technology and Science, Hyderabad Campus, Pilani, Telangana, 500078, India
| | - Neha Singh
- Unison I3X Private Limited, Plot No. 23, Maruti Industrial Area, Sector-18, Gurgaon, Haryana, 122015, India
- The K.R.T. Arts, B.H. Commerce & A.M. Science College, Savitribai Phule Pune University, Gangapur Rd, Shivaji Nagar, Nashik, Maharashtra, 422002, India
| | - Jitesh Lalwani
- School of Business, Woxsen University, Hyderabad, Telangana, 502345, India
| | - Hemapriya Srinivasan
- Department of Biological Sciences, Birla Institute of Technology and Science, Hyderabad Campus, Pilani, Telangana, 500078, India
| | - Sankar Ganesh Palani
- Department of Biological Sciences, Birla Institute of Technology and Science, Hyderabad Campus, Pilani, Telangana, 500078, India.
| |
Collapse
|
2
|
Kriswantoro JA, Chu CY, Chang TR, Pai HJ, Chang CK, Chiu YP. Comparison of thermal alkaline pretreatment and zinc acetate-catalyzed methanolysis (MtOH-ZnOAc) for anaerobic digestion of bioplastic waste. BIORESOURCE TECHNOLOGY 2023; 377:128959. [PMID: 36965583 DOI: 10.1016/j.biortech.2023.128959] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 03/20/2023] [Accepted: 03/22/2023] [Indexed: 06/18/2023]
Abstract
The aim of this work was to study the effect of thermal alkaline pretreatment and zinc acetate-catalyzed methanolysis (MtOH-ZnOAc) in biogas production from bioplastic in anaerobic digestion. The pretreated bioplastic with MtOH-ZnOAc performs efficient solubilization and produced 205.7 ± 6.9 mL/g CODadded, which is higher than thermal alkaline degradation. The mesophilic condition produces more than 79% higher biogas compared with the thermophilic condition with the diluted pretreated bioplastic by 30 times. The kinetic study was well fit the experimental data and showed the correlation between cumulative biogas, production rate, and lag phase with mono- and two-stage system in batch fermentation. The two-stage system produced 315.6 ± 7.7 mL/g CODadded which was higher 67.2 ± 2.02 than the mono-stage system. Methanosaetaceae predominates among the Archaea, which are primarily responsible for methanogenesis, showing a contribution to a higher biogas production rate.
Collapse
Affiliation(s)
- Jayen Aris Kriswantoro
- Ph.D. Program of Mechanical and Aeronautical Engineering, Feng Chia University, Taiwan; Institute of Green Products, Feng Chia University, Taiwan; School of Life Sciences and Technology, Institut Teknologi Bandung (ITB), Indonesia
| | - Chen-Yeon Chu
- Ph.D. Program of Mechanical and Aeronautical Engineering, Feng Chia University, Taiwan; Institute of Green Products, Feng Chia University, Taiwan; Institute of Atmospheric Pollution Research (IIA), CNR, Italy.
| | - Ting-Rui Chang
- Institute of Green Products, Feng Chia University, Taiwan; Department of Mechanical and Computer-Aided Engineering, Feng Chia University, Taiwan
| | - Hao-Jen Pai
- Institute of Green Products, Feng Chia University, Taiwan; Department of Mechanical and Computer-Aided Engineering, Feng Chia University, Taiwan
| | | | | |
Collapse
|
3
|
Al Hasani Z, Kumar Nayak J, Alhimali H, Al-Mamun A. Enhancing methane production of co-digested food waste with granular activated carbon coated with nano zero-valent iron in an anaerobic digester. BIORESOURCE TECHNOLOGY 2022; 363:127832. [PMID: 36029986 DOI: 10.1016/j.biortech.2022.127832] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 08/18/2022] [Accepted: 08/21/2022] [Indexed: 06/15/2023]
Abstract
Anaerobic digestion (AD) possesses dual benefits of waste treatment and energy generation. The use of conductive additives in AD matrix has potential to improve process yield. Hence, the study aimed to investigate a thermophilic AD (TAD) inserted by granular activated carbon coated with nano zero-valent iron (GAC/nZVI) in the matrix and was operated for mono-digestion and co-digestion of cow manure with food wastes (rice and bread) to check the bioprocess improvement. The results were compared with the control TAD without conductive additives. Biogas production increased by 11 folds upon using GAC/nZVI addition compared to the control TAD. Moreover, the addition of GAC/nZVI increased the methane in biogas by 20.7 folds compared to control one. With GAC/nZVI, the maximum COD removal of 78.29% and 85.21% were noticed for co-digestion and mono digestion, respectively. Such improvement of TAD performance was due to easy bacterial communication and electron exchange through the conductive particles.
Collapse
Affiliation(s)
- Zahra Al Hasani
- Department of Civil and Architectural Engineering, Sultan Qaboos University, P.O. Box 33, Al-Khoud 123, Muscat, Oman
| | - Jagdeep Kumar Nayak
- Department of Civil and Architectural Engineering, Sultan Qaboos University, P.O. Box 33, Al-Khoud 123, Muscat, Oman
| | - Halima Alhimali
- Department of Civil and Architectural Engineering, Sultan Qaboos University, P.O. Box 33, Al-Khoud 123, Muscat, Oman
| | - Abdullah Al-Mamun
- Department of Civil and Architectural Engineering, Sultan Qaboos University, P.O. Box 33, Al-Khoud 123, Muscat, Oman.
| |
Collapse
|