scholarly journals Terminal steps in the anaerobic digestion of municipal sewage sludge: Effects of inhibitors of methanogenesis and sulfate reduction.

1988 ◽  
Vol 34 (5) ◽  
pp. 425-432 ◽  
Author(s):  
KATSUJI UEKI ◽  
ATSUKO UEKI ◽  
YOSHIHISA SIMOGOH
Keyword(s):  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Sulfate Reduction ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge

scholarly journals Effect of micro-aerobic process on improvement of anaerobic digestion sewage sludge treatment: flow cytometry and ATP assessment

RSC Advances ◽  
2020 ◽  
Vol 10 (59) ◽  
pp. 35718-35728
Author(s):  
Reza Barati rashvanlou ◽  
Abbas Rezaee ◽  
Mahdi Farzadkia ◽  
Mitra Gholami ◽  
Majid Kermani
Keyword(s):  
Flow Cytometry ◽  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Methane Production ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Sludge Treatment ◽  
Pretreatment Method ◽  
Aerobic Process ◽  
Sewage Sludge Treatment

Micro-aeration as a pretreatment method improves the efficiency of anaerobic digestion of municipal sewage sludge and consequently promotes the methane production.

scholarly journals The role of sulfate reduction in methanogenic digestion of municipal sewage sludge.

1992 ◽  
Vol 38 (3) ◽  
pp. 195-207 ◽  
Author(s):  
KATSUJI UEKI ◽  
ATSUKO UEKI ◽  
KIYOSHI TAKAHASHI ◽  
MASAKAZU IWATSU
Keyword(s):  
Sewage Sludge ◽  
Sulfate Reduction ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge

A Pilot Plant Study of the Anaerobic Digestion of a Mixture of Municipal Sewage and Industrial Sludges

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2465-2468 ◽  
Author(s):  
K. Sugrue ◽  
G. Kiely ◽  
E. McKeogh
Keyword(s):  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Dry Matter ◽  
Agricultural Land ◽  
Pilot Project ◽  
County Council ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
One Year ◽  
Treatment And Disposal

With up to 100 tonnes/day of municipal sewage sludge, the municipality of Cork County Council had a problem of disposal. Spreading on agricultural land was the most common method of disposal until the 1986 EC Directive 86/278/EEC imposed severe restrictions on such a method. For industry in the county, the method of disposal was sometimes landfilling, but more often disposal at sea. The Helsinki Agreement terminates sea disposal. An evaluation of treatment and disposal means identified anaerobic digestion as an alternative to land and sea disposal. After anaerobic digestion, the sludge is sufficiently sti ilised to spread on land. A pilot project using a 20m3 reactor was studied for one year, using a fixture of municipal sewage sludge, yeast from a citric acid industry and abattoir waste (including blood, paunch contents and sheep's offal). The results were impressive; input sludge of 10% dry matter was reduced to 2%; the COD reduction approached 90%; in the mesophylic temperature range, the sludge was stabilised after an HRT of 29 days. The sludge after anaerobic digestion satisfies the EC limits for landspreading.

scholarly journals The Effect of Static Magnetic Field on Methanogenesis in the Anaerobic Digestion of Municipal Sewage Sludge

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 590
Author(s):  
Marcin Zieliński ◽  
Marcin Dębowski ◽  
Joanna Kazimierowicz
Keyword(s):  
Magnetic Field ◽  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Exposure Time ◽  
Static Magnetic Field ◽  
Production Efficiency ◽  
Anaerobic Bacteria ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Anaerobic Sludge

The present study aimed to determine the effect of a 17.6 mT static magnetic field (SMF) on the efficiency of anaerobic digestion (AD) of municipal sewage sludge (MSS). The SMF had a significant impact on methane (CH4) production efficiency, the levels of fermentation rate (ηFMSS) vs. removal rate (ηVS), and the structure of the anaerobic bacteria consortium, but it did not affect cumulative biogas production. The highest CH4 yield (431 ± 22 dm3CH4/kgVS) and the highest methane content in the biogas (66.1% ± 1.9%) were found in the variant in which the SMF exposure time was 144 min/day. This variant also produced the highest ηFMSS and ηVS values, reaching 73.8% ± 2.3% and ηVS 36.9% ± 1.6%, respectively. Longer anaerobic sludge retention time in the SMF area significantly decreased AD efficiency and caused a significant reduction in the number of methanogens in the anaerobic bacteria community. The lowest values were observed for SMF exposure time of 432 min/day, which produced only 54.8 ± 1.9% CH4 in the biogas. A pronounced reduction was recorded in the Archaea (ARC915) and Methanosaeta (MX825) populations in the anaerobic sludge, i.e., to 20% ± 11% and 6% ± 2%, respectively.

scholarly journals Anaerobic Digestion for Biogas Production from Municipal Sewage Sludge: A Comparative Study between Fine Mesh Sieved Primary Sludge and Sedimented Primary Sludge

Water ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 3532
Author(s):  
Phillimon T Odirile ◽  
Potlako M Marumoloa ◽  
Anthoula Manali ◽  
Petros Gikas
Keyword(s):  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Biogas Production ◽  
Physicochemical Characteristics ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Anaerobic Sludge ◽  
Primary Sludge ◽  
Fine Mesh ◽  
Volatile Solids

Two different types of primary sewage sludge have been used as feedstock for production of biogas through anaerobic digestion (AD): the one type was sludge from a typical primary clarifier (PC), while the other type of sludge produced by a rotating belt filter, commonly called microsieve (MS). Initially the main physicochemical characteristics of the sludges, such as total solids (TS), volatile solids (VS), VS/TS, pH and carbon to nitrogen ratio (C/N) were determined, for MS: 37.86 ± 0.08%, 83.00 ± 0.41%, 0.83 ± 0.00, 6.67 ± 0.08 and 19.68 ± 0.69, respectively, and for PC: 2.61 ± 0.08%, 78.77 ± 1.91%, 0.79 ± 0.02, 6.61 ± 0.10 and 14.46 ± 1.23, respectively. Then, calculated amounts of the sludges were inserted into airtight vials and were inoculated using anaerobic sludge. The daily biogas production was measured over a period of 30 days. PC sludge maximized the daily biogas production (44.20 mlbiogas/gvsd) 11 days after inoculation, while the MS sludge reach a peak (37.74 mlbiogas/gvsd) 14 days after inoculation. The cumulative biogas production over the 30 days of AD was in the same laver (442.29 mlbiogas/gvs for PC versus 434.73 mlbiogas/gvs for MS). However, PC sludge indicated higher daily biogas production, compared to MS sludge, while the opposite was observed for the period following the peak point. The Volatile Solids Reduction for PC and MS sludges was recorded as 46.06% and 32.39%, respectively.

Inhibition of Anaerobic Digestion Caused by Heavy Metals

1992 ◽  
Vol 26 (3-4) ◽  
pp. 835-846 ◽  
Author(s):  
R. F. Mueller ◽  
A. Steiner
Keyword(s):  
Heavy Metals ◽  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Methanogenic Bacteria ◽  
Metal Species ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Digested Sludge ◽  
General Sequence ◽  
Lower Nickel

The severity of heavy metal inhibition on anaerobic digestion is dependent on the metal species and their dissolved concentration in the digester. The general sequence of inhibition on anaerobic digestion of municipal sewage sludge was found with Ni > Cu > Cd > Cr > Pb. Metal immobilization affinity in the sludge followed the reverse sequence. Due to sulfide production during digestion high quantities of heavy metals are precipitating as highly insoluble sulfide salts. Nickel was immobilized to 94 % in the digester and indicated the most dramatic effect on anaerobic digestion. At a concentration of 250 to 300 g Ni m-3 toxicity occurred. Lower nickel concentrations resulted in reversible process inhibition. Copper up to 1000 g Cu m-3 caused reversible inhibition of acid producing, fermentative, and methanogenic bacteria. The time necessary for recovery of the process was dependent on the initial copper concentration in the digester. The organisms indicated capability of adaptation to copper. The copper uptake in the digester was 97 %. Cadmium inhibited digestion of sewage sludge up to approximately 50 % at 650 g Cd m-3. For long durations of acclimation a tendency toward recovery was observed. The cadmium uptake in the digested sludge was 99 %. Chromium and lead were uptaken at 99.9 % during digestion. Hence, the addition of these metals up to 1000 mg Cr/l and 600 mg Pb/l showed only little effect on anaerobic digestion.

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