Effect of Assisted Ultrasonication and Ozone Pretreatments on Sludge Characteristics and Yield of Biogas Production

Le, Tuan Minh; Vo, Phong Thanh; Anh, Tuan Nguyen; Tran, Lien Thi; Truong, Hoa Thi; Le, Thanh Thao Xuan; Chen, Yi‐Hung; Chang, Chia‐Chi; Chang, Ching‐Yuan; Trần, Quốc Toàn; Tran, Thanh; Do, Manh Van

doi:10.3390/pr7100743

Cited by 14 publications

(9 citation statements)

References 36 publications

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“…The enhancement effect of thermal pre-treatment on the activated sludge solubilisation and thus the anaerobic digestion biodegradability was also noted by Bougrier et al [20]. In a recent study, Le et al [21] has also demonstrated that the biodegradability and thus the biogas production from anaerobic digestion increased with sludge solubilisation. Thus, the LA and LC can be mixed with FW A as feed for anaerobic digestion to produce biogas for power generation.…”

Section: Properties Of Autoclaved and Condensed Liquid Productsmentioning

confidence: 55%

A Pilot Plant Study on the Autoclaving of Food Wastes for Resource Recovery and Reutilization

et al. 2018

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Autoclaving of food wastes (FW) for the resource recovery and reutilization was studied using the pilot plant scale. Experiments were conducted at various temperatures of 408, 428, and 438 K and times of 15 and 60 min. The in-filled steam to the autoclave was supplied by the incineration plant with a gauge pressure of 7 kg/cm2 and a temperature of 443 K or above. The results obtained from the experiments show that the less energy- and time-consuming autoclaving conditions (408 K and 15 min, denoted as Case A408-15) are effective. Comparisons of the properties and characteristics of autoclaved FW (FWA) of Case A408-15 with those of FW are made. The wet bulk volume and wet bulk density of FW A are dramatically reduced to 15.64% and increased to 313.37% relative to those of FW, respectively. This makes the subsequent processing and reuse for FWA more convenient than FW. The autoclaving results in an increase of carbon content and a decrease of nitrogen content, and thus an increase of the C/N ratio of FWA. The contents of sulfur, hemi-cellulose, and cellulose of FWA are also reduced. All these fluctuations are beneficial for making compost or other usages from FWA than FW. The autoclaved liquid product (LA) separated from FWA and liquid condensate (LC) from the released gas possess high COD and TOC. These two liquids can be mixed for use as liquid fertilizers with proper conditioning. Alternatively, further anaerobic digestion of the mixture of FWA, LA, and LC can offer enhanced biogas production for power generation. All these thus match the appeal of sustainable materials management and circular economy. The emitted gas from autoclaving contains no CO and some hydrocarbons. Suitable air pollution control is needed. The results and information obtained are useful for the proper recovery and reuse of abundant food wastes from domestic households and food industries.

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Section: Properties Of Autoclaved and Condensed Liquid Productsmentioning

confidence: 55%

A Pilot Plant Study on the Autoclaving of Food Wastes for Resource Recovery and Reutilization

et al. 2018

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“…Pot ale samples were treated with 1M NaOH first, then beaten for 0, 7.5, and 15 min. The required ratio of sample and sludge (10, 30, and 50% sludge) for 400 mL of total volume were place into 500 mL conical flasks and AD experiments were performed at three different temperatures under mesophilic conditions (32,35, and 38 • C), as specified in Table 1. All experiments were performed in triplicate as indicated for each parameter (beating time, sludge percentages, and temperature).…”

Section: Doe For Ad Of Pot Ale and Pot Ale And Spent Grain MIX (5:1 Bmentioning

confidence: 99%

“…Removing lignin increases the reactivity of the remaining polysaccharides [26] since biodegradability of many lignocellulosic compounds are associated with the fractions of hemicellulose, cellulose, and lignin [33]. Mechanical pre-treatments increase the specific surface area of the feedstock available for the microbes as well as resulting in intracellular compound release [34,35]. Furthermore, it provides a greater digestate dewaterability and no odour generation [36].…”

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confidence: 99%

Optimisation and Modelling of Anaerobic Digestion of Whiskey Distillery/Brewery Wastes after Combined Chemical and Mechanical Pre-Treatment

et al. 2020

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Whiskey distillery waste streams consisting of pot ale (liquid residue) and spent grain (solid residue) are high strength organic wastes and suitable feedstock for anaerobic digestion (AD) from both economic and environmental stand points. Anaerobic digestion of pot ale and pot ale/spent grain mixtures (with mixing ratios of 1:1, 1:3, and 1:5 by wet weight) was performed after implementation of a novel hybrid pre-treatment (combined chemical and mechanical) in order to modify lignocellulosic structure and ultimately enhance digestion yield. Lignin, hemicellulose, and cellulose fractions were determined before and after chemical pre-treatment. Effects of different inoculum rates (10-30-50% on wet basis) and beating times (0-7.5-15 min) on anaerobic digestion of pot ale alone and of pot ale/spent grain mixtures were investigated in lab scale batch mode with a major focus of optimising biogas yield by using response surface methodology (RSM) in Design Expert Software. The highest biogas yields of 629 ± 8.5 mL/g vs. (51.3% CH 4 ) and 360 ± 10 mL/g vs. (55.0 ± 0.4) with anaerobic digestion of pot ale alone and spent grain mix after 1M NaOH and 7.5 min beating pre-treatments with 50% inoculum ratio respectively. The optimum digestion conditions to maximise the biogas quality and quantity were predicted as 10 and 13 min beating times and 32 and 38 • C digestion temperatures for anaerobic digestion of pot ale alone and spent grain mix respectively.Processes 2020, 8, 492 2 of 27 of alternative energy sources has arisen [5]. Among the renewable energy sources, biogas, which is methane rich gas produced by anaerobic digestion (AD) of organic waste, is considered to be among the most environmentally friendly fuel sources [6] owing to its non-toxic characteristics and potential for simplicity of use as an alternative over traditional fossil fuels, as well as its potential reduction in wastes sent to landfill [7].Typical waste disposal levels of whiskey distilleries and breweries and the potential environmental concerns associated with those waste streams was outlined by [8]. Due to the high organic content, large disposal volume, and the acidic nature, pot ale is the major concern of the waste management of whiskey distilleries. As such, AD with advantages over other waste management methods like low energy requirement, odour limitation, less by-product generation, and higher ability to cope with recalcitrant nature of whiskey distillery/brewery waste streams is a suitable alternative waste treatment method [9][10][11][12]. There are four main stages in the AD process-namely hydrolysis, acidogenesis, acetogenesis, and methanogenesis-and the reactions in each stage are carried out by different bacteria. The thermodynamics of each AD stage and potential bacterial competitions have been reported in detail by [13,14]. In order to have a balanced AD, identical reaction rates are desired, however, the hydrolysis step is considered to be the rate limiting step for the digestion of lignocellulosic matter due to the impact of high lig...

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“…Other pretreatments intended for improving hydrolysis include ultrasonication, available at a commercial scale, whereas other treatment options such as microwave pre-treatment, electrokinetic and high-pressure disruption are mechanical pre-treatments studied mainly under laboratory conditions or using small scale prototypes [ 19 , 20 , 21 , 22 , 23 ]. Other pre-treatment methods include the use of chemicals—acidic, alkali, ozonation—[ 24 , 25 ], and the application of advanced oxidation processes [ 26 , 27 ], and biological options (temperature-phased anaerobic digestion and microbial electrolysis cell) [ 28 , 29 , 30 ] or combinations on any of the above to increase the effectiveness of solubilization. However, the capacity of recovering the heat of the thermal hydrolysis process makes this technology superior when evaluating the efficiency in energy use.…”

Section: Introductionmentioning

confidence: 99%

Anaerobic Digestion for Producing Renewable Energy—The Evolution of This Technology in a New Uncertain Scenario

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Carpio

et al. 2021

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Anaerobic digestion is a well-known technology with wide application in the treatment of high-strength organic wastes. The economic feasibility of this type of installation is usually attained thanks to the availability of fiscal incentives. In this review, an analysis of the different factors associated with this biological treatment and a description of alternatives available in literature for increasing performance of the process were provided. The possible integration of this process into a biorefinery as a way for producing energy and chemical products from the conversion of wastes and biomass also analyzed. The future outlook of anaerobic digestion will be closely linked to circular economy principles. Therefore, this technology should be properly integrated into any production system where energy can be recovered from organics. Digestion can play a major role in any transformation process where by-products need further stabilization or it can be the central core of any waste treatment process, modifying the current scheme by a concatenation of several activities with the aim of increasing the efficiency of the conversion. Thus, current plants dedicated to the treatment of wastewaters, animal manures, or food wastes can become specialized centers for producing bio-energy and green chemicals. However, high installation costs, feedstock dispersion and market distortions were recognized as the main parameters negatively affecting these alternatives.

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Effect of Assisted Ultrasonication and Ozone Pretreatments on Sludge Characteristics and Yield of Biogas Production

Cited by 14 publications

References 36 publications

A Pilot Plant Study on the Autoclaving of Food Wastes for Resource Recovery and Reutilization

A Pilot Plant Study on the Autoclaving of Food Wastes for Resource Recovery and Reutilization

Optimisation and Modelling of Anaerobic Digestion of Whiskey Distillery/Brewery Wastes after Combined Chemical and Mechanical Pre-Treatment

Anaerobic Digestion for Producing Renewable Energy—The Evolution of This Technology in a New Uncertain Scenario

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