Methane production from acetamide in an upflow anaerobic sludge-blanket reactor based on a synergistic association between an aerobic rod and methanogens

1995 ◽  
Vol 43 (6) ◽  
pp. 1107-1111 ◽  
Author(s):  
J.-P. Guyot ◽  
H. Ferrer ◽  
R. Florina
Keyword(s):  
Methane Production ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Anaerobic Sludge Blanket

Upflow anaerobic sludge blanket (UASB) treatment of supernatant of cow manure by thermal pre-treatment

2006 ◽  
Vol 54 (9) ◽  
pp. 221-227 ◽  
Author(s):  
Y. Yoneyama ◽  
A. Nishii ◽  
M. Nishimoto ◽  
N. Yamada ◽  
T. Suzuki
Keyword(s):  
Production Rate ◽  
Methane Production ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Methane Fermentation ◽  
Methane Production Rate ◽  
Pre Treatment ◽  
Anaerobic Sludge Blanket ◽  
Solid Liquid ◽  
Solid Liquid Separation

Upflow anaerobic sludge blanket (UASB) methane fermentation treatment of cow manure that was subjected to screw pressing, thermal treatment and subsequent solid–liquid separation was studied. Conducting batch scale tests at temperatures between 140 and 180 °C, the optimal temperature for sludge settling and the color suppression was found to be between160–170 °C. UASB treatment was carried out with a supernatant obtained from the thermal treatment at the optimal conditions (170 °C for 30 minutes) and polymer-dosed solid–liquid separation. In the UASB treatment with a CODCr loading of 11.7 kg/m3/d and water temperature of 32.2 °C, the CODCr level dropped from 16,360 mg/L in raw water to 3,940 mg/L in treated water (CODCr removal rate of 75.9%), and the methane production rate per CODCr was 0.187 Nm3/kg. Using wastewater thermal-treated at the optimal conditions, also a methane fermentation treatment with a continuously stirred tank reactor (CSTR) was conducted (CODCr in raw water: 38,000 mg/L, hydraulic retention time (HRT): 20 days, 35 °C). At the CODCr loading of 1.9 kg/m3/d, the methane production rate per CODCr was 0.153 Nm3/kg. This result shows that UASB treatment using thermal pre-treatment provides a CODCr loading of four times or more and a methane production rate of 1.3 times higher than the CSTR treatment.

EFFECT OF COD LOADING RATE ON AN UPFLOW ANAEROBIC SLUDGE BLANKET REACTOR DURING ANAEROBIC DIGESTION OF PALM OIL MILL EFFLUENT WITH BUTYRATE / SUVARTOJAMO CHDS POVEIKIS PALMIŲ ALIEJAUS GAMYBINIŲ NUOTEKŲ SU BUTIRATU ANAEROBINIO PŪDYMO PLOKŠTELINIAME REAKTORIUJE METU

2012 ◽  
Vol 20 (4) ◽  
pp. 256-264 ◽  
Author(s):  
Anwar Ahmad ◽  
Rumana Ghufran ◽  
Zularisam Abd. Wahid
Keyword(s):  
Palm Oil ◽  
Methane Production ◽  
Loading Rate ◽  
Oxygen Demand ◽  
Palm Oil Mill Effluent ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Loading Rates ◽  
Palm Oil Mill ◽  
Anaerobic Sludge Blanket

Palm oil Mill Effluent (POME) with concentrated butyrate was treated in a 4.5 l upflow anaerobic sludge blanket reactor (UASBR), run over a range of influent concentrations (16.5–46.0 g-COD l−1), chemical oxygen demand (COD) loading rates (1.5–11.5 g-CODl−1d−1) and 11–4 days hydraulic retention time (HRT) at 37 °C by maintaining pH between 6.5–7.5. The process consistently removed 97–99% of COD at loading rates up to 1.5–4.8 g-COD l−1d−1 by varying HRT (11–7.2 days). Butyrate is an important intermediate in the anaerobic degradation of organic matter. In sulphate-depleted environment, butyrate in POME (BOD/COD ratio of 0.5) is β-oxidised to acetate and hydrogen, by obligate proton reducers in syntrophic association with hydrogen utilizing methanogens. The conversion of acetate to methane appeared to be rate limiting step. Maximum biogas (20.17 ll−1d−1) and methane production (16.2 ll−1d−1) were obtained at COD loading rate of 4.80 gl−1d−1and HRT of 7.2 days. The biogas and methane production were higher in the presence of butyrate compared to control. The methane content of the biogas was in the range of 70–80% throughout the study while in control it was 60–65%. Finding of this study clearly indicates the successful treatment of POME with butyrate in UASBR. Santrauka Palmių aliejaus gamybinės nuotekos (POME) su koncentruotu butiratu buvo apdorotos 4,5 l talpos aukštyn tekančio aerobinio dumblo plokšteliniame reaktoriuje (UASBR). Nuotekos tekėjo įvairių koncentracijų (16,5–46,0 g – ChDS 1−1), cheminio deguonies suvartojimo (ChDS) normos (1,5–11,5 g – ChDS 1−1d.−1). Hidraulinio sulaikymo trukmė (HRT) nuo 11 iki 4 dienų, kai temperatūra 37 °C, pH palaikant 6,5–7,5. Vykstant procesui nuolat buvo pašalinama 97–99% ChD, kai tiekimo ir pakrovimo sparta 1,5–4,8 g – ChDS 1−1d.−1 kintant HRT(11–7,2 d.). Butiratas yra svarbus tarpininkas organinių medžiagų anaerobinio skilimo procese. Sulfatas iš aplinkos, butiratas iš POME (BDS/ChDS santykis 0,5) yra acetato ir vandenilio β oksidatoriai, priverčiantys protonų reducentus sintrofinės sąveikos su vandeniliu metu utilizuoti metanogenus. Acetato virtimas metanu pasirodė esąs greitį ribojantis veiksnys. Daugiausia biodujų (20,17 l 1−1 d.−1) ir metano (16,2 l 1−1 d.−1) susidarė tada, kai suvartojamo ChD tiekimo greitis buvo 4,80 g 1−1d.−1, o HRT – 7,2 dienos. Daugiau biodujų ir metano susidarė dalyvaujant butiratui, palyginti su kontroliniu pavyzdžiu. Biodujose metano kiekis tyrimo metu svyravo 70–80%, o kontroliniame buvo 60–65%. Šis tyrimas aiškiai parodė, kad POME su butiratu UASBreaktoriuje apdorojamas sėkmingai.

Sulphate Reduction Control to Enhance Methane Composition in Anaerobic Digester

2015 ◽  
Vol 735 ◽  
pp. 205-209
Author(s):  
Syahrul Syazwan Yaacob ◽  
A. Sabri ◽  
A. Yuzir
Keyword(s):  
Ferric Chloride ◽  
Methane Production ◽  
Sulphate Reduction ◽  
Upflow Anaerobic Sludge Blanket ◽  
Critical Conditions ◽  
Anaerobic Sludge ◽  
Production Of Hydrogen ◽  
High Level ◽  
Anaerobic Sludge Blanket ◽  
Reducing Bacteria

The aim of this research is to investigate addition of iron (ferric chloride) to control of sulphate reduction in order to enhance the methane production under laboratory scale. The bioreactor Upflow Anaerobic Sludge Blanket (UASB) undergoes continuous operation under anaerobic condition treating synthetic sulphate enriched wastewater. The wastewater used as influent wastewater with a total COD 8000 mg.L-1. The experiment was conducted for about 64 days and was operated at constant OLR of 2.0(±0.1) kgCOD.m-3.d-1 by maintaining a hydraulic retention time (HRT) of 4 days. The UASB then were feed with sulphate and give the COD/SO4 ratio 5.3, 2.5 and 1.5. Then amount of ferric chloride at 10.4, 22.2 and 44.5 mM was introduce just after methane producing bacteria (MPB) were completely inhibited by sulphate reducing bacteria (SRB) due to decreasing of methane composition (CH4) and high level production of hydrogen sulphide (H2S). The obtained results showed that the FeCl3 negatively impacted the anaerobic digestion process since with each of COD/SO42- ratio, and the amount addition of ferric chloride to feed regime, gives promotion on methane production, with 67, 70 and 69% after approximately 10 to 15 days operating at critical conditions.

Temperature effect on UASB reactor operation for domestic wastewater treatment in temperate climate regions

2003 ◽  
Vol 48 (3) ◽  
pp. 25-30 ◽  
Author(s):  
B. Lew ◽  
M. Belavski ◽  
S. Admon ◽  
S. Tarre ◽  
M. Green
Keyword(s):  
Methane Production ◽  
Domestic Wastewater ◽  
Cod Removal ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Temperate Climate ◽  
Anaerobic Sludge ◽  
Biological Degradation ◽  
Domestic Wastewater Treatment ◽  
Anaerobic Sludge Blanket

The performance of an upflow anaerobic sludge blanket (UASB) reactor was investigated for the treatment of domestic wastewater at different operational temperatures (28, 20, 14 and 10°C) and loading rates. For each temperature studied a constant CODt removal was observed as long as the upflow velocity was lower than 0.35 m/h: 82% at 28°C, 68% at 14°C and 44% at 10°C. At 20°C the COD removal increased with the HRT, reaching similar values as at 28°C for long HRT. At upflow velocities higher than 0.35 m/h, a reduction in total COD removal was observed due to washout of influent TSS. At 28°C, a constant 200 g sludge mass was observed and COD removal was attributed to biological degradation only. At lower temperatures, COD removal resulted from degradation and solids accumulation in the reactor. The increase in reactor sludge was greater as the temperature decreased and explains the similar overall COD removal efficiency at 28°C, 20°C and 14°C. During the transition from winter to summer conditions (10°C to 28°C), methane production initially increased due to the degradation of accumulated solids. Afterwards, methane production gradually declined and an increase in COD removal was observed, indicating that the TSS accumulated during the winter was exhausted and influent degradation remained.

scholarly journals Methanization potential of anaerobic biodigestion of solid food waste

2018 ◽  
Vol 22 (1) ◽  
pp. 69-73 ◽  
Author(s):  
Laís R. G. de Oliveira ◽  
Derovil A. dos Santos Filho ◽  
Kaline C. Vasconcelos ◽  
Talita V. de Lucena ◽  
José F. T. Jucá ◽  
...  
Keyword(s):  
Food Waste ◽  
Methane Production ◽  
Granular Sludge ◽  
Methanogenic Bacteria ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Buffering Agent ◽  
Semi Solid ◽  
Unfavorable Condition ◽  
Anaerobic Sludge Blanket

ABSTRACT Anaerobic biodigestion of solid and semi-solid wastes has been widely used for the treatment of these residues and methane production; however, during the process (more specifically in the acidogenic phase), there is a tendency of pH reduction, an unfavorable condition to methanogenic bacteria. Thus, the present work aims to evaluate the methanization potential of an agroindustrial anaerobic granular sludge (AIS) from UASB (Upflow Anaerobic Sludge Blanket) reactor, individually and biodigested with food waste (FW) from the University Restaurant of the Federal University of Pernambuco with buffering agent (AIS + FW + b) and without it (AIS + FW). After the laboratory tests, the AIS + FW + b configuration obtained a cumulative methane production approximately six times greater than that of AIS + FW, and approximately twice that of the inoculum alone (AIS).

Pemodelan Reaktor Hibrid Anaerob Pengolah Molasse Pada Pembebanan Organik Tinggi

2020 ◽  
Author(s):  
Gede H Cahyana
Keyword(s):  
Fluidized Bed ◽  
Fixed Bed ◽  
High Rate ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Expanded Bed ◽  
Anaerobic Sludge Blanket

Telah dikembangkan reaktor anaerob kecepatan tinggi (high rate) yang merupakan modifikasi reaktor konvensional. Di antaranya berupa (bio)reaktor pertumbuhan tersuspensi (contoh: UASB, Upflow Anaerobic Sludge Blanket) dan reaktor pertumbuhan lekat (Fixed Bed atau Biofilter, Fluidized Bed, Expanded Bed, Rotating Biodisc dan Baffled Reactor). Kedua tipe reaktor di atas memiliki sejumlah kelebihan dan kekurangan. Untuk mengoptimalkan nilai positifnya (terutama untuk keperluan desain) maka reaktor tersebut, pada penelitian ini, disusun menjadi satu urutan yang disebut Reaktor Hibrid Anaerob (Rehan) yakni UASB di bawah dan AF di atasnya. Lebih lanjut, penelitian ini diharapkan dapat memberikan informasi tentang kinerja Rehan dalam mengolah air limbah (substrat) yang konsentrasi zat organiknya (COD) sangat tinggi dan suatu model matematika yang dapat mewakili reaktor tersebut.

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