scholarly journals Synergistic Effects of Magnetic Nanomaterials on Post-Digestate for Biogas Production

Molecules ◽  
2021 ◽  
Vol 26 (21) ◽  
pp. 6434
Author(s):  
Emmanuel Kweinor Tetteh ◽  
Gloria Amo-Duodu ◽  
Sudesh Rathilal
Keyword(s):  
Energy Savings ◽  
Biogas Production ◽  
Synergistic Effects ◽  
Magnetic Nanomaterials ◽  
Methane Yield ◽  
High Water Content ◽  
Wastewater Management ◽  
Water And Wastewater Treatment ◽  
Working Volume ◽  
Methane Potential

Digestate is characterized by high water content, and in the water and wastewater treatment settings, necessitates both large storage capacities and a high cost of disposal. By seeding digestate with four magnetic nanoparticles (MNPs), this study aimed to recover biogas and boost its methane potential anaerobically. This was carried out via biochemical methane potential (BMP) tests with five 1 L bioreactors, with a working volume of 80% and 20% head space. These were operated under anaerobic conditions at a temperature 40 °C for a 30 d incubation period. The SEM/EDX results revealed that the morphological surface area of the digestate with the MNPs increased as compared to its raw state. Comparatively, the degree of degradation of the bioreactors with MNPs resulted in over 75% decontamination (COD, color, and turbidity) as compared to the control system result of 60% without MNPs. The highest biogas production (400 mL/day) and methane yield (100% CH4) was attained with 2 g of Fe2O4-TiO2 MNPs as compared to the control biogas production (350 mL/day) and methane yield (65% CH4). Economically, the highest energy balance achieved was estimated as 320.49 ZAR/kWh, or 22.89 USD/kWh in annual energy savings for this same system. These findings demonstrate that digestate seeded with MNPs has great potential to improve decontamination efficiency, biogas production and circular economy in wastewater management.

scholarly journals Biochemical Methane Potential of Cork Boiling Wastewater at Different Inoculum to Substrate Ratios

2021 ◽  
Vol 11 (7) ◽  
pp. 3064
Author(s):  
Roberta Mota-Panizio ◽  
Manuel Jesús Hermoso-Orzáez ◽  
Luis Carmo-Calado ◽  
Gonçalo Lourinho ◽  
Paulo Sérgio Duque de Brito
Keyword(s):  
Anaerobic Digestion ◽  
Biogas Production ◽  
Treatment Plant ◽  
Organic Substrates ◽  
Biochemical Methane Potential ◽  
Volatile Solids ◽  
Working Volume ◽  
Methane Potential ◽  
Bmp Test ◽  
Cork Industry

The present study evaluates the digestion of cork boiling wastewater (CBW) through a biochemical methane potential (BMP) test. BMP assays were carried out with a working volume of 600 mL at a constant mesophilic temperature (35 °C). The experiment bottles contained CBW and inoculum (digested sludge from a wastewater treatment plant (WWTP)), with a ratio of inoculum/substrate (Ino/CBW) of 1:1 and 2:1 on the basis of volatile solids (VSs); the codigestion with food waste (FW) had a ratio of 2/0.7:0.3 (Ino/CBW:FW) and the codigestion with cow manure (CM) had a ratio of 2/0.5:0.5 (Ino/CBW:CM). Biogas and methane production was proportional to the inoculum substrate ratio (ISR) used. BMP tests have proved to be valuable for inferring the adequacy of anaerobic digestion to treat wastewater from the cork industry. The results indicate that the biomethane potential of CBWs for Ino/CBW ratios 1:1 and 2:1 is very low compared to other organic substrates. For the codigestion tests, the test with the Ino/CBW:CM ratio of 2/0.7:0.3 showed better biomethane yields, being in the expected values. This demonstrated that it is possible to perform the anaerobic digestion (AD) of CBW using a cosubstrate to increase biogas production and biomethane and to improve the quality of the final digestate.

scholarly journals Biogas Production from Physicochemically Pretreated Grass Lawn Waste: Comparison of Different Process Schemes

Molecules ◽  
2020 ◽  
Vol 25 (2) ◽  
pp. 296 ◽  
Author(s):  
Georgia Antonopoulou ◽  
Dimitrios Vayenas ◽  
Gerasimos Lyberatos
Keyword(s):  
Biogas Production ◽  
Economic Assessment ◽  
Methane Yield ◽  
Biochemical Methane Potential ◽  
Naoh Pretreatment ◽  
Volatile Solids ◽  
Methane Potential ◽  
Whole Slurry ◽  
Almost All ◽  
Pretreated Biomass

Various pretreatment methods, such as thermal, alkaline and acid, were applied on grass lawn (GL) waste and the effect of each pretreatment method on the Biochemical Methane Potential was evaluated for two options, namely using the whole slurry resulting from pretreatment or the separate solid and liquid fractions obtained. In addition, the effect of each pretreatment on carbohydrate solubilization and lignocellulossic content fractionation (to cellulose, hemicellulose, lignin) was also evaluated. The experimental results showed that the methane yield was enhanced with alkaline pretreatment and, the higher the NaOH concentration (20 g/100 gTotal Solids (TS)), the higher was the methane yield observed (427.07 L CH4/kg Volatile Solids (VS), which was almost 25.7% higher than the BMP of the untreated GL). Comparing the BMP obtained under the two options, i.e., that of the whole pretreatment slurry with the sum of the BMPs of both fractions, it was found that direct anaerobic digestion without separation of the pretreated biomass was favored, in almost all cases. A preliminary energy balance and economic assessment indicated that the process could be sustainable, leading to a positive net heat energy only when using a more concentrated pretreated slurry (i.e., 20% organic loading), or when applying NaOH pretreatment at a lower chemical loading.

scholarly journals Development of a Modified Plug-Flow Anaerobic Digester for Biogas Production from Animal Manures

Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2628 ◽  
Author(s):  
Gómez ◽  
Ramos-Suárez ◽  
Fernández ◽  
Muñoz ◽  
Tey ◽  
...  
Keyword(s):  
Organic Matter ◽  
Biogas Production ◽  
Plug Flow ◽  
Total Solid ◽  
Pilot Scale ◽  
Methane Yield ◽  
Organic Loading Rate ◽  
Pig Manure ◽  
Anaerobic Reactors ◽  
Methane Potential

Traditional plug-flow anaerobic reactors (PFRs) are characterized by lacking a mixing system and operating at high total solid concentrations, which limits their applicability for several kinds of manures. This paper studies the performance of a novel modified PFR for the treatment of pig manure, characterized by having an internal sludge mixing system by biogas recirculation in the range of 0.270–0.336 m3 m−3 h−1. The influence on the methane yield of four operating parameters (recirculation rate, hydraulic retention time, organic loading rate, and total solids) was evaluated by running four modified PFRs at the pilot scale in mesophilic conditions. While the previous biodegradability of organic matter by biochemical methane potential tests were between 31% and 47% with a methane yield between 125 and 184 LCH4 kgVS−1, the PFRs showed a suitable performance with organic matter degradation between 25% and 51% and a methane yield of up to 374 LCH4 kgVS−1. Operational problems such as solid stratification, foaming, or scum generation were avoided.

scholarly journals Optimisation of C:N Ratio for Co-Digested Processed Industrial Food Waste and Sewage Sludge Using the BMP Test

2011 ◽  
Vol 9 (1) ◽  
Author(s):  
Zuhaib Siddiqui ◽  
N.J. Horan ◽  
Kofi Anaman
Keyword(s):  
Sewage Sludge ◽  
Food Waste ◽  
Biogas Production ◽  
C:N Ratio ◽  
Methane Yield ◽  
Biochemical Methane Potential ◽  
Volatile Solids ◽  
Methane Potential ◽  
Biomethane Production ◽  
Bmp Test

Biomethane production from processed industrial food waste (IFW) in admixture with sewage sludge (primary and waste activated sludge: PS and WAS) was evaluated at a range of C:N ratios using a standard biochemical methane potential (BMP) test. IFW alone had a C:N of 30 whereas for WAS it was 5.4 and thus the C:N ratio of the blends fell in that range. Increasing the IFW content in mix improves the methane potential by increasing both the cumulative biogas production and the rate of methane production. Optimum methane yield 239 mL/g VSremoved occurred at a C:N ratio of 15 which was achieved with a blend containing 11 percent (w/w) IFW. As the fraction of IFW in the blend increased, volatile solids (VS) destruction was increased and this led to a reduction in methane yield and amount of production. The highest destruction of volatile solids of 93 percent was achieved at C:N of 20 followed by C:N 30 and 15. A shortened BMP test is adequate for evaluating optimum admixtures.

scholarly journals Biochemical Methane Potential of Agro Wastes

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Vidhya Prabhudessai ◽  
Anasuya Ganguly ◽  
Srikanth Mutnuri
Keyword(s):  
Biogas Production ◽  
Coconut Oil ◽  
Methane Yield ◽  
Batch Mode ◽  
Solids Concentration ◽  
Anaerobic Biodegradability ◽  
Volatile Solids ◽  
Cashew Apple ◽  
Methane Potential ◽  
Coconut Oil Cake

The focus of our work is on anaerobic digestion of locally available agro wastes like coconut oil cake, cashew apple waste, and grass from lawn cuttings. The most productive agro waste, in terms of methane yield, was coconut oil cake and grass. The results showed that the initial volatile solids concentration significantly affected the biogas production. The methane yield from coconut oil cake was found to be 383 ml CH4/g VS and 277 ml CH4/g VS added at 4 and 4.5 g VS/l. In case of grass the biogas production increased with increasing VS concentrations with methane yield of 199, 250, 256, 284, and 332 ml CH4/g VS at 3, 3.5, 4, 4.5, and 5.0 g VS/l. For cashew apple waste single-stage fermentation inhibited biogas production. However, phase separation showed methane yield of 60.7 ml CH4/g VS and 64.6 ml CH4/g VS at 3.5 and 4.0 g VS/l, respectively. The anaerobic biodegradability of coconut oil cake was evaluated in fed batch mode in a 5 L anaerobic reactor at 4 g VS/L per batch, and the maximum methane yield was found to be 320 ml CH4/g VS.

scholarly journals Anaerobic Co-digestion of Press mud and Molasses-based Distillery Wastewater for Enhanced Biogas Production

2021 ◽  
Vol 943 (1) ◽  
pp. 012017
Author(s):  
R C Evidente ◽  
M C Almendrala ◽  
A R Caparanga ◽  
K R Pamintuan ◽  
J A Mendoza
Keyword(s):  
Biogas Production ◽  
Tap Water ◽  
Methane Yield ◽  
Dilution Ratio ◽  
Press Mud ◽  
Erlenmeyer Flask ◽  
Working Volume ◽  
Significant Difference ◽  
Distillery Wastewater ◽  
Mesophilic Condition

Abstract With goals in determining the effect of diluting the distillery wastewater (DWW) and of varying the amount of DWW and press mud (PM), anaerobic co-digestion study was carried out at mesophilic condition in a 2-L Erlenmeyer flask, with a working volume of 800 mL for Batch 1 and 1500 mL for Batch 2 experiments. For Batch 1, two different ratios of DWW and tap water, with 2:3 and 3:2, were used to assess the effect of dilution on the methane yield, where same volumetric amount of PM was added. For Batch 2, following ratio of PM and DWW were used: a) 1:0, b) 1:1, c) 1:1, d) 2:1, and e) 1:2. All samples had the same amount of inoculum, except that Batch 1 samples had bagasse. The parameters that were assessed after 42 days of digestion were: pH, COD, BOD, TSS, VS, Cu, Ca, Mg, Mn, TOC, TN, and methane yield. For the effect of dilution, a significant difference in the methane yield between samples with higher and lower dilution ratio was seen, and in the first batch, the optimal dilution ratio of DWW and H2O, with 3:2 gave higher methane yield of 78.23% (v/v). Meanwhile, optimal volumetric ratio of DWW and PM from the Batch 2 experiments, with value of 1:2, gave the highest methane yield of 79.43% (v/v).

scholarly journals Synergistic Co-Digestion of Microalgae and Primary Sludge to Enhance Methane Yield from Temperature-Phased Anaerobic Digestion

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4547
Author(s):  
Mekdimu Mezemir Damtie ◽  
Jingyeong Shin ◽  
Hyun Min Jang ◽  
Young Mo Kim
Keyword(s):  
Anaerobic Digestion ◽  
Synergistic Effects ◽  
Operating Conditions ◽  
Methane Yield ◽  
Biological Pretreatment ◽  
Primary Sludge ◽  
Thermophilic Conditions ◽  
Methane Potential ◽  
Pretreatment Conditions ◽  
Anaerobic Pretreatment

A two-stage temperature-phased mesophilic anaerobic digestion assay was carried out to study the interaction between various biological pretreatment conditions and the possible synergistic co-digestion of microalgae and primary sludge. The study of growth kinetics of the biochemical methane potential test revealed that a maximum of 36% increase in methane yield was observed from co-digestion of a substrate pretreated by thermophilic aerobic conditions (55 °C and HRT = 2 days) and an 8.3% increase was obtained from the anaerobic pretreated substrate (55 °C and HRT = 3 days). Moreover, no synergistic effects on methane yields were observed in co-digesting the substrate pretreated with high temperature (85 °C). The study also identified specific conditions in which interaction between biological pretreatment and co-digestion might substantially reduce methane yield. Careful optimization of operating conditions, both aerobic and anaerobic pretreatment at moderate thermophilic conditions, can be used as a biological pretreatment to enhance methane yield from the co-digestion of microalgae and primary sludge.

scholarly journals Biogas from mono- and co-digestion of microalgal biomass grown on piggery wastewater

2018 ◽  
Vol 78 (1) ◽  
pp. 103-113 ◽  
Author(s):  
P. Carminati ◽  
D. Gusmini ◽  
A. Pizzera ◽  
A. Catenacci ◽  
K. Parati ◽  
...  
Keyword(s):  
Cheese Whey ◽  
Biogas Production ◽  
Degradation Kinetics ◽  
Synergistic Effects ◽  
Oxygen Demand ◽  
Carbonaceous Material ◽  
Methane Yield ◽  
Organic Loading Rate ◽  
Piggery Wastewater ◽  
Microalgal Biomass

Abstract Biogas production has been suggested as a valid valorization solution for microalgal/bacteria biomass (MAB) grown on wastewater. This research is aimed at assessing the feasibility to use MAB grown in an outdoor raceway fed on piggery wastewater for biogas production. Batch and continuous anaerobic tests were conducted on the sole MAB and on a blend of MAB and carbonaceous substrates (deproteinated cheese whey and cellulose) to improve the carbon/nitrogen ratio. Results of batch biochemical methane potential tests confirmed that the sole microalgal/bacteria biomass was poorly degradable (119 NmLCH4·gCOD−1), while blending it with deproteinated cheese whey or cellulose (80% of carbonaceous material and 20% of MAB, as chemical oxygen demand (COD)) had no synergistic effects on the methane yield, although slight improvements in the degradation kinetics were observed. Continuous anaerobic degradation tests (at an organic loading rate of 1.5 gCOD·L−1·d−1, 35 °C and 30 days of hydraulic retention time) increased the overall methane yield from 81 NmLCH4·gCOD−1 (sole MAB) to 216 NmLCH4·gCOD−1 (MAB and deproteinated cheese whey) and 122 NmLCH4·gCOD−1 (MAB and cheese whey). However, data confirm that no evident synergistic effects were obtained.

scholarly journals Effect of Ultrasonic Pretreatment on Biogas Production from Rice Straw

2019 ◽  
Vol 35 (4) ◽  
pp. 1265-1273
Author(s):  
Saran Pansripong ◽  
Weerachai Arjharn ◽  
Pansa Liplap ◽  
Thipsuphin Hinsui
Keyword(s):  
Rice Straw ◽  
Biogas Production ◽  
Agricultural Waste ◽  
Power Level ◽  
Methane Yield ◽  
Biochemical Methane Potential ◽  
Ultrasonic Pretreatment ◽  
Methane Potential ◽  
The One ◽  
Exposition Time

The effect of ultrasonic pretreatment on biogas production from rice straw was investigated. Results showed that the application of 37 and 102 kHz resulted in a reduction of hemicellulose about 25.78% and 20.82%, respectively. An increase in the power level and exposition time decreased the hemicellulose content. The biochemical methane potential values at 37 kHz and 102 kHz of the pretreated rice straw for a period of 45 days were 250.36 and 243.79 mL CH4 g VS-1added, which were about 21.95% and 18.75% increase compared to the unpretreated one, respectively. The pretreatment with 37 kHz has provided a better methane yield compared to the one with 102 kHz. Response surface methodology indicated a positive result toward the methane yield and production rate. The utilization of ultrasonic pretreatment toward rice straw for biogas production seems to provide a solution to help solving the problems of both agricultural waste and renewable energy.

scholarly journals Pre-treatment of thickened waste activated sludge (TWAS) for enhanced biogas production via the application of a novel radial horn sonication technology

2017 ◽  
Vol 75 (9) ◽  
pp. 2179-2193 ◽  
Author(s):  
Sri Suhartini ◽  
Lynsey Melville ◽  
Tony Amato
Keyword(s):  
Activated Sludge ◽  
Biogas Production ◽  
Applied Pressure ◽  
Low Frequency ◽  
Waste Activated Sludge ◽  
Biochemical Methane Potential ◽  
Experimental Conditions ◽  
Working Volume ◽  
Methane Potential ◽  
Pre Treatment

The efficacy of sonication as a pre-treatment to anaerobic digestion (AD) was assessed using thickened waste activated sludge (TWAS). Efficiency was measured in relation to solubilisation, dewaterability, and AD performance. Eighteen experimental conditions were evaluated at low frequency (20 kHz), duration (2–10 s), amplitude (∼8–12 μm) and applied pressure (0.5–3.0 barg), using a sonix™ patented titanium sonoprobe capable of delivering an instantaneous power of ∼6 kW provided by Doosan Enpure Ltd (DEL). An optimised experimental protocol was used as a pre-treatment for biochemical methane potential (BMP) testing and semi-continuous trials. Four digesters, with a 2-L working volume were operated mesophilically (37 ± 0.5 °C) over 22 days. The results showed that the sonix™ technology delivers effective sonication at very short retention times compared to conventional system. Results demonstrate that the technology effectively disrupts the floc structures and filaments within the TWAS, causing an increase in solubilisation and fine readily digestible material. Both BMP tests and semi-continuous trials demonstrated that sonicated TWAS gave higher biodegradability and methane potential compared to untreated TWAS. Partial-stream sonication (30:70 sonicated to untreated TWAS) resulted in a proportionate increase in biogas production illustrating the benefits of full-stream sonication.

Sign in / Sign up

Export Citation Format

Share Document