scholarly journals Effect of the inoculum/substrate ratio on the biochemical methane potential (BMP) of grape marc

2020 ◽  
Vol 15 (5) ◽  
pp. 1
Author(s):  
Kessia Caroline Dantas da Silva ◽  
Miriam Cleide Cavalcante de Amorim ◽  
Renan Santana Galvão ◽  
Yandra Beatriz de Oliveira Gonçalves ◽  
Paula Tereza de Souza e Silva ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Biological Treatment ◽  
Organic Waste ◽  
Biochemical Methane Potential ◽  
Biomass Waste ◽  
Grape Marc ◽  
Nutritive Solution ◽  
Methane Potential ◽  
Industrialization Process ◽  
Substrate Ratio

The grape industrialization process produces large volumes of solid organic waste, with the grape bagasse being the main waste generated in the winemaking process. Anaerobic digestion can be used to treat and dispose of agro-industrial biomass waste. The objective of this study was to evaluate the effect of the inoculum/substrate ratio on the Biochemical Methane Potential (BMP) of grape marc. The experiment was performed in laboratory scale through a system of reactor bottles in batches, removing a set of triplicate flasks for sampling and analysis every 48 hours, with the test lasting 12 days. The reactors contained residue, inoculum and 20% of nutritive solution, maintaining 20% of headspace. The reactors were incubated in an incubator at a mesophilic temperature (35 ± 2°C) and shaken manually every 24 hours. Three different inoculum/substrate (I/S) ratios of 0.75, 1.5 and 3 were used to evaluate the methane yield, organic removals and at the end of degradation the morphology of the bacterial community was evaluated by means of scanning electron microscopy. The I/S 3 ratio provided the best results for loading anaerobic systems, indicating that grape marc presents potential for biological treatment through anaerobic digestion.

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.

Using Two-Phase Anaerobic Digestion for Organic Waste

2014 ◽  
Vol 953-954 ◽  
pp. 300-303 ◽  
Author(s):  
Fang Yin ◽  
Wu Di Zhang ◽  
Jing Liu ◽  
Hong Yang
Keyword(s):  
Anaerobic Digestion ◽  
Biological Treatment ◽  
Organic Waste ◽  
Single Phase ◽  
Treatment Process ◽  
Maximal Activity ◽  
Two Phase ◽  
High Efficient ◽  
Development Direction ◽  
Biological Treatment Process

The essence of the two phase anaerobic biological treatment process is to place acid bacteria and methane-producing bacteria in two reactors respectively, where it can provide the optimal conditions for their growth and metabolism, allowing them to live up to their maximal activity, which greatly improve processing capacity and efficiency compared to a single-phase anaerobic digestion. The paper start with the two phase anaerobic digestion process, in order to discuss the development direction of high efficient anaerobic digestion system.

scholarly journals Enhancing Methane Production from Spring-Harvested Sargassum muticum

2021 ◽  
pp. 117-123
Author(s):  
Supattra Maneein ◽  
John J. Milledge ◽  
Birthe V. Nielsen
Keyword(s):  
Anaerobic Digestion ◽  
Pharmaceutical Industry ◽  
Brown Seaweed ◽  
Sargassum Muticum ◽  
Biofuel Production ◽  
Biochemical Methane Potential ◽  
Seaweed Species ◽  
Invasive Seaweed ◽  
Methane Potential ◽  
Aqueous Meoh

AbstractSargassum muticum is a brown seaweed which is invasive to Europe and currently treated as waste. The use of S. muticum for biofuel production by anaerobic digestion (AD) is limited by low methane (CH4) yields. This study compares the biochemical methane potential (BMP) of S. muticum treated in three different approaches: aqueous methanol (70% MeOH) treated, washed, and untreated. Aqueous MeOH treatment of spring-harvested S. muticum was found to increase CH4 production potential by almost 50% relative to the untreated biomass. The MeOH treatment possibly extracts AD inhibitors which could be high-value compounds for use in the pharmaceutical industry, showing potential for the development of a biorefinery approach; ultimately exploiting this invasive seaweed species.

scholarly journals A Novel Nitrogen Removal Technology Pre-Treating Chicken Manure, Prior to Anaerobic Digestion

2020 ◽  
Vol 12 (18) ◽  
pp. 7463
Author(s):  
Marie E. Kirby ◽  
Muhammad W. Mirza ◽  
James Davies ◽  
Shane Ward ◽  
Michael K. Theodorou
Keyword(s):  
Anaerobic Digestion ◽  
Nitrogen Removal ◽  
Recovery Process ◽  
Pilot Scale ◽  
Operating Conditions ◽  
Chicken Manure ◽  
Nitrogen Recovery ◽  
Biochemical Methane Potential ◽  
Removal Technology ◽  
Methane Potential

Chicken manure is an agricultural by-product that is a problematic feedstock for anaerobic digestion due to its high nitrogen content inhibiting methane yields. This research examines a novel pilot-scale method of ammonia stripping, the nitrogen recovery process (NRP) developed by Alchemy Utilities Ltd. The NRP was designed to remove and recover nitrogen from chicken manure and two different operating conditions were examined. Both operating conditions demonstrated successful nitrogen removal and recovery. The biochemical methane potential assays were used to compare the digestibility of the NRP-treated chicken manures to that of a fresh chicken manure control. Overall, the biochemical methane potential assays demonstrated that some NRP-treated chicken manure treatments produced significantly more methane compared to untreated manure, with no inhibition occurring in relation to ammonium. However, some of the NRP-treated chicken manures produced similar or lower methane yields compared to fresh chicken manure. The NRP requires further development to improve the efficiency of the pilot-scale unit for commercial-scale operation and longer-term continuous anaerobic digestion trials are required to determine longer-term methane yield and ammonium inhibition effects. However, these initial results clearly demonstrate the technology’s potential and novel application for decentralised, on-farm nitrogen recovery and subsequent anaerobic digestion of chicken manure.

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