scholarly journals Methanogenic Activity and Repression on Hydrogen Sulfide Evolved During High Rate Thermophilic Methane Fermentation of Municipal Solid Waste.

2003 ◽  
Vol 39 (1) ◽  
pp. 17-24 ◽  
Author(s):  
IKBAL ◽  
YUEQIN TANG ◽  
TORU SHIGEMATSU ◽  
SHIGERU MORIMURA ◽  
KENJI KIDA
Keyword(s):  
Hydrogen Sulfide ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
High Rate ◽  
Methane Fermentation ◽  
Methanogenic Activity

Anaerobic Digestion of Olive Oil Mill Effluent Pretreated and Stored in Municipal Solid Waste Sanitary Landfills

1993 ◽  
Vol 28 (2) ◽  
pp. 27-34 ◽  
Author(s):  
G. Boari ◽  
I. M. Mancini ◽  
E. Trulli
Keyword(s):  
Anaerobic Digestion ◽  
Municipal Solid Waste ◽  
Olive Oil ◽  
Solid Waste ◽  
Pilot Scale ◽  
Methanogenic Activity ◽  
Sanitary Landfills ◽  
Olive Oil Mill Effluent ◽  
A Cell ◽  
Mesh Sieve

Sanitary landfills of municipal solid waste (MSW) might be used to reduce the storage volume required at plants giving year-round treatment of olive oil mill effluent (OME). A landfill in the methanogenic stage could act as an anaerobic filter and reduce the pollutional load of the OME while also acting as a temporary storage tank. In the present work, a lysimeter in pilot scale was used to simulate a cell of a sanitary landfill. It was filled with MSW screened by a 80 mm mesh sieve mixed to municipal sludge. Results show that when OME was spread on the top of the lysimeter at a loading rate not exceeding 0.4 kgCOD/d/m3 of reactor steady methanogenic activity was maintained in the layers of refuse and a 70% removal of COD was obtained in the OME leachate collected. Higher loading rates reduced methanogenic activity and COD removal efficiency. Nevertheless, the OME collected from the bottom of the landfill was more easily treated by anaerobic digestion than was the raw OME.

Solid-Phase Methane Fermentation of Solid Wastes

1985 ◽  
Vol 107 (3) ◽  
pp. 402-405 ◽  
Author(s):  
S. Ghosh
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Fermentation Process ◽  
Solid Phase ◽  
Solid Wastes ◽  
Methane Yield ◽  
Methane Fermentation ◽  
Batch Operation ◽  
Volatile Solids ◽  
Process Operation

This paper presents the development of a novel solid-phase methane fermentation process involving acidic bioleachate production from an organic bed and biomethanation of the bed-liquefaction products in an external methane digester. Process operation with municipal solid waste showed that about 81 percent of the biodegradable volatile solids (VS) could be stabilized during three months of batch operation to afford a methane yield of 0.21 std m3 / kg VS added under ambient (∼25°C) conditions; this compares favorably with an ultimate mesophilic (35°C) methane yield of 0.26 std m3 / kg VS added.

scholarly journals High prevalence of Antibiotic Resistance Bacteria isolated from Municipal Solid Waste Dumpsite, Bahir Dar, Ethiopia

2021 ◽  
Author(s):  
Baye Sitotaw ◽  
Fikremariam Ayalew ◽  
Abayeneh Girma ◽  
Kindu Geta ◽  
Mulugeta Kibret
Keyword(s):  
Antibiotic Resistance ◽  
Antimicrobial Resistance ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
High Rate ◽  
Bahir Dar ◽  
Municipal Solid Wastes ◽  
Biochemical Tests ◽  
Antibiotic Drug ◽  
Staphylococcus Spp

Abstract Background The emergence of antibiotic resistance (ABR) among environmental microbes has been challenging global health. ABR can be transferred to human-associated bacteria aggravating the spread of antimicrobial resistance. Due to poor solid waste disposal practices, municipal solid waste dumpsite (MSWDS) can be a reservoir for antimicrobial resistant microorganisms, such as bacteria. This study aimed to assess the prevalence of antibiotic resistance (ABR) bacteria at Bahir Dar city MSWDS. Methods Soil samples were collected from three randomly selected sites within the dumpsite from November 2020 to May 2021. Bacteria were isolated, identified and tested for ABR using standard procedures. Results In this study, 71 distinct colonies were isolated and identified to ten bacterial genera based on cultural characteristics and biochemical tests. The pooled antibiotic résistance rate was 85.9%. Resistance to the tested antibiotics ranged between 0% for erythromycin and 100% for amoxicillin among the bacterial isolates. High proportions of the isolates were found to be resistant to amoxicillin (100%), vancomycin (87%) and nalidixic acid (73.3%). Substantial proportions of the isolates were also resistant to Streptomycin (54.5%), sulfonamide (50%) and tetracycline (48.5%). On the other hand, high sensitivity rates to erythromycin (90.91%), ciprofloxacin (83.10%), chloramphenicol (77.46%) and gentamicin (63.49%) were recorded. All isolates related to Staphylococcus spp., and most isolates related to Pseudomonas, Escherichia, Klebsiella, Salmonella, Enterococcus, Citrobacter, Shigella and Proteus species were resistant at least to one antibiotic drug. The overall multidrug resistance (MDR) rate was 49.3%, and a high rate of MDR was demonstrated among isolates related to Escherichia spp. (75%), Staphylococcus spp. (68.8%), Pseudomonas spp. (62.5%) and Klebsiella spp. (60%), where each isolate resisted at least 5 antibiotic drugs. Conclusion From the present study, it can be concluded that a high incidence of ABR exists in Bahir Dar city MSWDS. The occurrence of the high level of ABR to commonly used antibiotics in this study demands a proper waste management system, as well as surveillance programs to monitor for antimicrobial resistance determinants in municipal solid wastes. Moreover, detailed studies on the isolates and ABR genes will give a better insight into the prevalence of ABR in the waste dumpsite.

Influence of moisture content on the specific methanogenic activity of dry mesophilic municipal solid waste digestate

2011 ◽  
Vol 87 (7) ◽  
pp. 1032-1035 ◽  
Author(s):  
Ronan Le Hyaric ◽  
Hassen Benbelkacem ◽  
Julien Bollon ◽  
Rémy Bayard ◽  
Renaud Escudié ◽  
...  
Keyword(s):  
Moisture Content ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Methanogenic Activity ◽  
Specific Methanogenic Activity

scholarly journals Adsorption of Hydrogen Sulfide (H2S) from Municipal Solid Waste by Using Biochars

2021 ◽  
Vol 12 (6) ◽  
pp. 8057-8069
Keyword(s):  
Hydrogen Sulfide ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Removal Efficiency ◽  
Rice Hull ◽  
Banana Peel ◽  
Surface Functional Group ◽  
Adsorption Method ◽  
H2s Removal ◽  
Ability To Act

The emission of hydrogen sulfide (H2S) from municipal solid waste is one of the environmental issues that raised the public’s attention and awareness. Exposure to H2S that brings a foul smell of rotten eggs will cause headaches, irritation, dizziness, fatigue, and even death if the concentration of H2S is too high. The study’s goals are to investigate the properties of biochars made from rice hulls, banana peels, and sawdust; to compare the biochars’ physical and chemical properties; and establish the H2S removal efficiency of the three biochars. Biochars derived from rice hull (RHB-500), banana peel (BPB-550), and sawdust (SDB-500) by pyrolysis were used as the adsorbents. The biochar yield, pH, ash content, surface functional group, and morphology of the biochars produced were investigated. In this study, H2S was synthesized by mixing food waste and soil in the experimental column. The H2S produced was reduced by the adsorption method. The removal efficiencies of H2S for each biochar were determined by allowing the synthetic H2S to flow through the two columns that were packed with sand (act as control) and biochars, respectively. All biochars were alkaline, and BPB-550 had the highest pH, followed by SDB-500 and finally RHB-500. The order for removal efficiency of H2S (>94%) is BPB-550 > SDB-500 > RHB-500. Overall, the biochars derived from biomass had a strong ability to act as the adsorbents for H2S removal.

scholarly journals Effect of Heat Pretreatment on Mesophilic Methane Fermentation of Food Refuse in Municipal Solid Waste

2004 ◽  
Vol 40 (4) ◽  
pp. 153-160
Author(s):  
YUKI IKEDA ◽  
YOSHIHIKO KURAHASHI ◽  
KOHJI NAKAMURA ◽  
TADAAKI MORI ◽  
TOSHINORI KAMEOKA
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Methane Fermentation ◽  
Heat Pretreatment

Experimental investigation and modelling of the effect of sulfate on anaerobic biodegradation processes in municipal solid waste

2003 ◽  
Vol 48 (4) ◽  
pp. 221-227 ◽  
Author(s):  
N. Mora-Naranjo ◽  
C. Alamar-Provecho ◽  
J. Meima ◽  
A. Haarstrick ◽  
D.C. Hempel
Keyword(s):  
Hydrogen Sulfide ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Anaerobic Biodegradation ◽  
Inhibitory Effect ◽  
Experimental Investigations ◽  
Methane Formation ◽  
Inhibition Effect ◽  
Different Temperatures ◽  
Good Agreement

The experimental investigations have been carried out in two parts. First, the biodegradation of the organic compounds in the municipal solid waste has been investigated with focus on different sulfate concentrations influencing the methane formation. Second, the inhibition effect of hydrogen sulfide in solution (H2Saq) on the acetate, and methane formation, respectively, has been studied at different pH and temperature values. In solution the equilibrium of hydrogen sulfide (H2S(aq)) and the hydrogen sulfide anion (HS-(aq)) mainly depends on pH. At pH 6.3 the favoured species is H2S(aq) whereas at pH 7.7 the HS-(aq) species is favoured. Additionally, the experiments have been carried out at two different temperatures (35°C and 55°C). According to the acetate and methane formation the H2S(aq) species is observed to have an inhibitory effect. All simulations based on a biodegradation model represented are in good agreement with the experimental data obtained.

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