A review of anaerobic digestion of slaughterhouse waste: effect of selected operational and environmental parameters on anaerobic biodegradability

2021 ◽  
Author(s):  
Gilbert Kofi Selormey ◽  
Benedict Barnes ◽  
Francis Kemausuor ◽  
Lawrence Darkwah
Keyword(s):  
Anaerobic Digestion ◽  
Environmental Parameters ◽  
Anaerobic Biodegradability

scholarly journals Comparison of the impacts of thermal pretreatment on waste activated sludge using aerobic and anaerobic digestion

2018 ◽  
Vol 78 (8) ◽  
pp. 1772-1781 ◽  
Author(s):  
Hyungjun (Brian) Jo ◽  
Wayne Parker ◽  
Peiman Kianmehr
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Oxygen Demand ◽  
Waste Activated Sludge ◽  
Thermal Pretreatment ◽  
Decay Products ◽  
Anaerobic Biodegradability ◽  
Pretreatment Conditions ◽  
The Impact ◽  
Aerobic And Anaerobic

Abstract A range of thermal pretreatment conditions were used to evaluate the impact of high pressure thermal hydrolysis on the biodegradability of waste activated sludge (WAS) under aerobic and anaerobic conditions. It was found that pretreatment did not increase the overall extent to which WAS could be aerobically biodegraded. Thermal pretreatment transformed the biodegradable fraction of WAS (XH) to readily biodegradable chemical oxygen demand (COD) (SB) (16.5–34.6%) and slowly biodegradable COD (XB) (45.8–63.6%). The impact of pretreatment temperature and duration on WAS COD fractionation did not follow a consistent pattern as changes in COD solubilization did not correspond to the observed generation of SB through pretreatment. The pretreated WAS (PWAS) COD fractionations determined from aerobic respirometry were employed in anaerobic modeling and it was concluded that the aerobic and anaerobic biodegradability of PWAS differed. It was found that thermal pretreatment resulted in as much as 50% of the endogenous decay products becoming biodegradable in anaerobic digestion. Overall, it was concluded that the COD fractionation that was developed based upon the aerobic respirometry was valid. However, it was necessary to implement a first-order decay process that reflected changes in the anaerobic biodegradability of the endogenous products through pretreatment.

Anaerobic Digestion of Solid Wastes Needs Research to Face an Increasing Industrial Success

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Pierre Buffiere ◽  
Liliana Delgadillo Mirquez ◽  
Jean Philippe Steyer ◽  
Nicolas Bernet ◽  
Jean Philippe Delgenes
Keyword(s):  
Organic Matter ◽  
Anaerobic Digestion ◽  
Methane Production ◽  
Biochemical Parameters ◽  
Energy Production ◽  
Solid Wastes ◽  
High Complexity ◽  
Intrinsic Kinetics ◽  
Anaerobic Biodegradability ◽  
Kinetics Of

Anaerobic digestion of solid wastes is an emerging solution for both waste management and energy production. The high complexity of the process is mostly attributed to the absence of descriptors for the design and the prediction of such a process. This paper presents an approach for the description of organic matter based on several biochemical parameters, established on 22 different organic wastes. The lignocellulosic content is the most important parameter for the prediction of anaerobic biodegradability and methane production; in addition, the knowledge of the carbohydrate, lipid and protein contents is also crucial and makes possible a prediction of the intrinsic kinetics of the reaction.

An OxiTop® protocol for screening plant material for its biochemical methane potential (BMP)

2012 ◽  
Vol 66 (7) ◽  
pp. 1416-1423 ◽  
Author(s):  
C. P. Pabón Pereira ◽  
G. Castañares ◽  
J. B. van Lier
Keyword(s):  
Anaerobic Digestion ◽  
Plant Material ◽  
Co2 Absorption ◽  
Biochemical Methane Potential ◽  
Test Conditions ◽  
Anaerobic Biodegradability ◽  
Methane Potential ◽  
Bmp Test ◽  
The Stability ◽  
Guidelines And Recommendations

A protocol was developed for determining the biochemical methane potential (BMP) of plant material using the OxiTop® system. NaOH pellets for CO2 absorption and different pretreatment methods were tested for their influence in the BMP test. The use of NaOH pellets in the headspace of the bottle negatively affected the stability of the test increasing the pH and inhibiting methanization. Sample comminution increased the biodegradability of plant samples. Our results clearly indicate the importance of test conditions during the assessment of anaerobic biodegradability of plant material, considering BMP differences as high as 44% were found. Guidelines and recommendations are given for screening plant material suitable for anaerobic digestion using the OxiTop® system.

Perspectives on microbial community in anaerobic digestion with emphasis on environmental parameters: A systematic review

Chemosphere ◽  
2020 ◽  
pp. 128618
Author(s):  
Hasan Pasalari ◽  
Mitra Gholami ◽  
Abbas Rezaee ◽  
Ali Esrafili ◽  
Mahdi Farzadkia
Keyword(s):  
Systematic Review ◽  
Microbial Community ◽  
Anaerobic Digestion ◽  
Environmental Parameters

Investigations on the changes in anaerobic biodegradability and biotoxicity of an industrial microbial biomass induced by a thermochemical pretreatment

2000 ◽  
Vol 41 (3) ◽  
pp. 137-144 ◽  
Author(s):  
J.P. Delgèns ◽  
V. Penaud ◽  
M. Torrijos ◽  
R. Moletta
Keyword(s):  
Anaerobic Digestion ◽  
Microbial Biomass ◽  
Operating Conditions ◽  
Thermochemical Pretreatment ◽  
Anaerobic Microorganisms ◽  
Rate Limiting Step ◽  
The Poor ◽  
Anaerobic Biodegradability ◽  
Physico Chemical ◽  
Rate Limiting

In the anaerobic digestion of solid wastes, hydrolysis is the rate limiting step and physico-chemical pretreatment is often required to promote solubilization of organic matter. As an illustration, anaerobic digestion was limited by the substrate solubilization step during continuous cultures performed with an industrial microbial biomass. In optimal operating conditions determined for the hydrolysis-acidogenesis step (T=35°C; pH=8.5; OLR=5.4 g COD/l.d) 50.6% COD solubilization was achieved. A thermochemical pretreatment based on sodium hydroxide addition, was used in order to enhance COD solubilization. Optimal conditions for COD solubilization were pH=12, T=140°C for 30 minutes. In these conditions, 70% COD solubilization was achieved. However, anaerobic biodegradability of the pretreated substrate was not improved and remained near 40%. The poor anaerobic biodegradability performances were attributed to the soluble molecules generated during the thermochemical pretreatment that were refractory and/or inhibitory to anaerobic microorganisms. Fractionation of the soluble pretreated microbial biomass by two methods (treatment with adsorbent resins and precipitation by pH adjustment) demonstrated that high molecular weight compounds (>100 kDa) are involved in the poor biodegradability and in the biotoxicity observed. Partial decolorization through resin use and acid precipitation remove these compounds. The consequence of their removal was an increase of the production of biogas.

Evaluation of the aerobic and anaerobic biodegradability of the antibiotic norfloxacin

2014 ◽  
Vol 70 (2) ◽  
pp. 265-271 ◽  
Author(s):  
Lucilaine Valéria de Souza Santos ◽  
Danusa Campos Teixeira ◽  
Raquel Sampaio Jacob ◽  
Míriam Cristina Santos do Amaral ◽  
Liséte Celina Lange
Keyword(s):  
Anaerobic Digestion ◽  
Industrial Wastewater ◽  
Biological Treatment ◽  
Wastewater Treatment Plants ◽  
Test Organism ◽  
Pharmaceutical Compounds ◽  
Treatment Processes ◽  
Anaerobic Biodegradability ◽  
Aliivibrio Fischeri ◽  
Aerobic And Anaerobic

The purpose of studying the biodegradability of pharmaceutical compounds is to evaluate their behaviors in relation to the treatment processes generally used in domestic and industrial wastewater treatment plants. The antibiotic norfloxacin was found to be a recalcitrant compound. The studies conducted showed norfloxacin removal rates of 12% and 18% when biomasses from treatments with activated sludge and anaerobic biodigesters, respectively, were used without acclimatization. This suggests that anaerobic digestion shows better performance for norfloxacin removal. Ecotoxicological tests, using the luminescent marine bacteria Aliivibrio fischeri as the test organism, show that anaerobic digestion could eliminate the toxicity of the antibiotic norfloxacin, even though total degradation of the drug was not observed. The release of norfloxacin during cell lysis suggests the importance of controlling this phenomenon in biological treatment systems that handle wastewater contaminated with norfloxacin, thus preventing the return of this drug to the environment.

Complete anaerobic digestion of activated sludge by combining membrane separation and alkaline heat post-treatment

1996 ◽  
Vol 34 (5-6) ◽  
pp. 477-481 ◽  
Author(s):  
M. Takashima ◽  
Y. Kudoh ◽  
N. Tabata
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Production Efficiency ◽  
Membrane Separation ◽  
Post Treatment ◽  
The Other ◽  
Combined Process ◽  
Anaerobic Biodegradability ◽  
Particulate Solids ◽  
Pre Treatment

The objective of this laboratory study was to improve the particulate solids decomposition of activated sludge by combining solids-liquid separation and post-treatment to anaerobic digestion. The application of membrane separation has been shown to enhance the anaerobic biodegradability of sewage sludge. In this study, an anaerobic membrane digester with a volume of 51 and UF membrane of 177 cm2 was operated at 35 °C and a HRT of 30 days without considerable sludge wastage. For the first 83 days, the membrane digester was operated without post-treatment. For the succeeding 41 days the membrane digester was combined with alkaline heat post-treatment. This was done by taking out 50 ml per day of the digester sludge, post-treating it under the condition of 0.1M NaOH and 175 °C for 1hr, and returning it to the digester. The particulate solids decomposition percentage averaged for each operating phase was 61% without the post-treatment and about 100% with the post-treatment. These results indicate that the post-treatment was able to selectively destroy unbiodegradable components of the lab-cultivated activated sludge. In addition, because the feed activated sludge can be concentrated in the membrane digester, the post-treatment requires less volume to be treated than pre-treatment. On the other hands, the operation and application of this post-treatment combined process are limited by the allowable digester sludge level imposed by the membrane separation. The problem to be solved is the deterioration of membrane permeate quality and methane production efficiency.

Anaerobic Biodegradability of the Organic Components of Municipal Solid Wastes (OFMSW)

1992 ◽  
Vol 25 (7) ◽  
pp. 285-293 ◽  
Author(s):  
C. S. Peres ◽  
C. R. Sanchez ◽  
C. Matumoto ◽  
W. Schmidell
Keyword(s):  
Anaerobic Digestion ◽  
Cellulose Content ◽  
Municipal Solid Wastes ◽  
Organic Components ◽  
Ch4 Production ◽  
Anaerobic Biodegradability ◽  
Volatile Solids ◽  
Solids Removal ◽  
Conversion Efficiencies ◽  
Anaerobic Conversion

The aim of this research was to study the anaerobic conversion efficiency of the organic fraction of municipal solid waste (OFMSW). In order to compare and appraise our techniques and respective conversion efficiencies, primary sewage sludge (PSS) assays were also performed. OFMSW has a high cellulose content (32.9% TS) followed by lignin (12.5% TS), protein (9.61% TS), lipids (5.94% TS) and hemicellulose (5.2% TS). PSS is equally rich in lipids (19.8% TS), protein (18.2% TS) and lignin (19.6% TS), followed by cellulose (13.4% TS) and hemicellulose (5.5% TS). Assays were run in CSTRbiodigesters operated at 35°C and 20 days hydraulic retention time (HRT). Three organic loading rates - 1.0, 2.7 and 3.8 OFMSW g VS/Lr.d (gram of volatile solids per liter of reactor per day) - were studied. PSS was assayed only at 1.0 g VS/Lr.d. Concerning the conversion efficiencies, the most important component for the OFMSW anaerobic digestion is cellulose (74.0 - 77.8% conversion), while lipids (70.0 - 80.6% conversion) are the most important for PSS. The biodegradability of the other organic components are also presented and discussed. Some literature data about OFMSW anaerobic digestion processes are discussed in view of the results presented here. The similarities between our results and those of the so-called dry fermentation processes are also discussed in order to evaluate efficiencies of biogas and CH4 production versus volatile solids removal.

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