scholarly journals Potencial bioquímico de metano de águas residuárias da ultrafiltração no processamento da acerola (Malpighia emarginata) verde

2020 ◽  
Vol 41 (2) ◽  
pp. 135
Author(s):  
Andreza Carla Lopes Andre ◽  
Miriam Cleide Cavalcante de Amorim ◽  
Kessia Caroline Dantas da Silva ◽  
Paula Tereza Souza e Silva
Keyword(s):  
Methane Production ◽  
Food Industry ◽  
Pilot Scale ◽  
Organic Load ◽  
Anaerobic Sludge ◽  
Biochemical Methane Potential ◽  
Decay Rate Constant ◽  
Malpighia Emarginata ◽  
Load Removal ◽  
Methane Potential

Ultrafiltration clarifies fruit juices, in the food industry, but generates retentive, recalcitrant wastewater, which, by its organic nature, may present a potential for biodegradation and methane production. This study aimed to evaluate the biochemical methane potential (BMP) in wastewater from the processing of unripe green acerola, obtaining the mass balance and the speed of organic load removal in COD terms. The BMP assays followed the German Guidelines VDI 4630, by applying three COD loads per liter of reactor vial (0,86 g CDOAplied L-1R, 1,5 g CDOAplied L-1R e 2,0 g CDOAplied L-1R), , in batches, inoculated with the anaerobic sludge from reactors treating domestic sewage, at 30 0C. The pH, COD, and methane production were evaluated every 48 hours. The biodegradability and the decay rate constant of the COD (Kd) were determined, thus obtaining the methanized COD, the COD for the formation of new cells, and the COD present in the wastewater, in the form of volatile acids. The best BMP was 0.100 L CH4 g -1 CDORemoved, the percentages of methanization were above 62 %, and the highest Kd occurred for the lowest load applied. The anaerobic digestion of the wastewater proved viable for in full-scale, with its application being suggested at a pilot scale.  

scholarly journals Anaerobic stabilisation of urine diverting dehydrating toilet faeces (UDDT-F) in urban poor settlements: biochemical energy recovery

2019 ◽  
Vol 9 (2) ◽  
pp. 289-299
Author(s):  
Joy Riungu ◽  
Mariska Ronteltap ◽  
Jules B. van Lier
Keyword(s):  
Methane Production ◽  
Urban Poor ◽  
Energy Recovery ◽  
Biogas Production ◽  
Plug Flow ◽  
Pilot Scale ◽  
Biochemical Methane Potential ◽  
Two Stage ◽  
One Stage ◽  
Methane Potential

Abstract Biochemical energy recovery using digestion and co-digestion of faecal matter collected from urine diverting dehydrating toilet faeces (UDDT-F) and mixed organic market waste (OMW) was studied under laboratory- and pilot-scale conditions. Laboratory-scale biochemical methane potential (BMP) tests showed an increase in methane production with an increase in OMW fraction in the feed substrate. In subsequent pilot-scale experiments, one-stage and two-stage plug flow digester were researched, applying UDDT-F:OMW ratios of 4:1 and 1:0, at about 10 and 12% total solids (TS) slurry concentrations. Comparable methane production was observed in one-stage (Ro-4:1,12%) (314 ± 15 mL CH4/g VS added) and two-stage (Ram-4:1,12%) (325 ± 12 mL CH4/g VS added) digesters, when applying 12% TS slurry concentration. However, biogas production in Ram-4:1,12% digester (571 ± 25 mL CH4/g VS added) was about 12% higher than in Ro-4:1,12%, significantly more than the slight difference in methane production, i.e. 3–4%. The former was attributed to enhanced waste solubilisation and increased CO2 dissolution, resulting from mixing the bicarbonate-rich methanogenic effluent for neutralisation purposes with the low pH (4.9) influent acquired from the pre-acidification stage. Moreover, higher process stability was observed in the first parts of the plug flow two-stage digester, characterised by lower VFA concentrations.

scholarly journals A Novel Nitrogen Removal Technology Pre-Treating Chicken Manure, Prior to Anaerobic Digestion

2020 ◽  
Vol 12 (18) ◽  
pp. 7463
Author(s):  
Marie E. Kirby ◽  
Muhammad W. Mirza ◽  
James Davies ◽  
Shane Ward ◽  
Michael K. Theodorou
Keyword(s):  
Anaerobic Digestion ◽  
Nitrogen Removal ◽  
Recovery Process ◽  
Pilot Scale ◽  
Operating Conditions ◽  
Chicken Manure ◽  
Nitrogen Recovery ◽  
Biochemical Methane Potential ◽  
Removal Technology ◽  
Methane Potential

Chicken manure is an agricultural by-product that is a problematic feedstock for anaerobic digestion due to its high nitrogen content inhibiting methane yields. This research examines a novel pilot-scale method of ammonia stripping, the nitrogen recovery process (NRP) developed by Alchemy Utilities Ltd. The NRP was designed to remove and recover nitrogen from chicken manure and two different operating conditions were examined. Both operating conditions demonstrated successful nitrogen removal and recovery. The biochemical methane potential assays were used to compare the digestibility of the NRP-treated chicken manures to that of a fresh chicken manure control. Overall, the biochemical methane potential assays demonstrated that some NRP-treated chicken manure treatments produced significantly more methane compared to untreated manure, with no inhibition occurring in relation to ammonium. However, some of the NRP-treated chicken manures produced similar or lower methane yields compared to fresh chicken manure. The NRP requires further development to improve the efficiency of the pilot-scale unit for commercial-scale operation and longer-term continuous anaerobic digestion trials are required to determine longer-term methane yield and ammonium inhibition effects. However, these initial results clearly demonstrate the technology’s potential and novel application for decentralised, on-farm nitrogen recovery and subsequent anaerobic digestion of chicken manure.

Assessing the role of biochemical methane potential tests in determining anaerobic degradability rate and extent

2011 ◽  
Vol 64 (4) ◽  
pp. 880-886 ◽  
Author(s):  
P. D. Jensen ◽  
H. Ge ◽  
D. J. Batstone
Keyword(s):  
Parameter Estimation ◽  
Methane Production ◽  
Estimation Method ◽  
Test Method ◽  
Continuous Systems ◽  
Batch Test ◽  
Biochemical Methane Potential ◽  
First Order ◽  
Methane Potential ◽  
The Impact

The biodegradability and bioavailability of hydrolysis-limited substrates under anaerobic (and aerobic) conditions can be represented by two key parameters – degradability (fd), or the percentage that can be effectively be destroyed during digestion, and first order hydrolysis coefficient (khyd), or the speed at which material breaks down. Biochemical methane potential (BMP) testing uses a batch test (in triplicate), and by fitting against a first order model, can fit both parameters in the same test. BMP testing is now being widely used for anaerobic process feasibility and design purposes, and standardisation efforts are ongoing. In this paper, we address a number of key issues relating to the test method and its analysis. This includes proposal of a new fitting and parameter estimation method, evaluation of the impact of inoculum to substrate ratio on fitted parameters, and comparison to performance in continuous systems. The new parameter estimation technique provides an estimate of parameter uncertainty and correlation, and is clearly more suitable than model transformation and linear regression. An inoculum volume ratio of at least 50% (2:1 on VS basis) was required on a cellulose substrate to use methane production as primary indicator, as found by comparing methane production and solubilisation of cellulose. Finally, on a typical material, waste activated sludge, the batch test was slightly conservative in terms of degradability and rate, indicating a bias in the BMP test. The test is a cost-effective and capable method to evaluate potential substrates, but it should be noted that it is generally conservative, especially if sub-optimal inoculum is used.

Stability and activity of anaerobic sludge from UASB reactors treating sewage in subtropical regions

2006 ◽  
Vol 54 (2) ◽  
pp. 223-229 ◽  
Author(s):  
L. Seghezzo ◽  
C.M. Cuevas ◽  
A.P. Trupiano ◽  
R.G. Guerra ◽  
S.M. González ◽  
...  
Keyword(s):  
Rate Constant ◽  
Pilot Scale ◽  
Hydrolysis Rate ◽  
Anaerobic Sludge ◽  
Decay Rate Constant ◽  
Methanogenic Activity ◽  
Biological Sludge ◽  
Organic Matter Concentration ◽  
Aerobic Wastewater Treatment ◽  
Uasb Reactors

The production of small amounts of well-stabilized biological sludge is one of the main advantages of upflow anaerobic sludge bed (UASB) reactors over aerobic wastewater treatment systems. In this work, sludge produced in three pilot-scale UASB reactors used to treat sewage under subtropical conditions was assessed for both stability and specific methanogenic activity. Stability of primary sludge from settling tanks and digested sludge from conventional sludge digesters was also measured for comparison purposes. Kinetic parameters like the hydrolysis rate constant and the decay rate constant were calculated. High stability was observed in sludge from UASB reactors. Methanogenic activity in anaerobic sludges was relatively low, probably due to the low organic matter concentration in influent sewage. Knowledge on sludge growth rate, stability, and activity might be very useful to optimize sludge management activities in full-scale UASB reactors.

scholarly journals Impact of Attrition Ball-Mill on Characteristics and Biochemical Methane Potential of Food Waste

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2085
Author(s):  
Yang Mo Gu ◽  
Seon Young Park ◽  
Ji Yeon Park ◽  
Byoung-In Sang ◽  
Byoung Seong Jeon ◽  
...  
Keyword(s):  
Particle Size ◽  
Anaerobic Digestion ◽  
Food Waste ◽  
Methane Production ◽  
Ball Mill ◽  
Volatile Fatty Acids ◽  
Milling Time ◽  
Biochemical Methane Potential ◽  
Methane Potential ◽  
The Impact

The impact of attrition ball-mill pretreatment on food waste particle size, soluble chemical oxygen demand (SCOD), biochemical methane potential, and microbial community during anaerobic digestion was investigated based on milling speed and time. The uniformity of particle size improved with increasing milling speed and time. The SCOD of the pretreated samples increased to 4%, 7%, and 17% at the speeds of 150, 225, and 300 rpm, respectively, compared to the control. Milling time did not significantly change the SCOD. The cumulative methane productions of 430, 440, and 490 mL/g-VS were observed at the speeds of 150, 225, and 300 rpm, respectively, while the untreated sample exhibited the cumulative methane production of 390 mL/g-VS. Extended milling time did not improve methane production much. When the milling times of 10, 20, and 30 min were applied with the milling speed fixed at 300 rpm, the methane productions of 490, 510, and 500 mL/g-VS were observed respectively. Ball-mill pretreatment also increased the total volatile fatty acids. During the anaerobic digestion (AD) of ball-mill treated food waste, acetoclastic methanogens predominated, with a relative abundance of 48–49%. Interestingly, hydrogenotrophic methanogens were 1.6 times higher in the pretreated samples than those in the control. These results showed the potential of attrition ball milling as a food waste pretreatment for improving methane production.

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