scholarly journals Anaerobic biodigestion of sugarcane vinasse under mesophilic conditions using manure as inoculum

2016 ◽  
Vol 11 (4) ◽  
pp. 763 ◽  
Author(s):  
Carlos Eduardo De Farias Silva ◽  
Ana Karla De Souza Abud
Keyword(s):  
Anaerobic Digestion ◽  
Oxygen Demand ◽  
Treatment Method ◽  
Inoculum Concentration ◽  
Total Solids ◽  
Consequent Reduction ◽  
Solids Content ◽  
Harmful Effects ◽  
Sugarcane Vinasse ◽  
Mesophilic Conditions

Sugarcane vinasse is one of the most polluting residues produced by Brazilian ethanol industries, mainly because of its harmful effects on the environmental, such as high organic matter load and acidity. Anaerobic digestion is a highly efficient wastewater treatment method that could potentially be used to treat sugarcane vinasse. This study examined the anaerobic biodigestion of sugarcane vinasse in mesophilic conditions (30 - 45°C) by varying the inoculum concentration (0.5 to 5.5%) and pH (6 - 8). Changes of Chemical Oxygen Demand (COD), total solids content, and yield and composition of biogas after the biodigestion of the vinasse were assessed. The vinasse was efficiently digested under mesophilic anaerobic conditions over a 23-day Hydraulic Retention Time (HRT) and a 5-day acidogenic phase with a consequent reduction of COD (54 - 83%) and total solids (52 - 87%). Statistical analyses at a confidence level of 95% suggested that temperature, pH and inoculum concentration did not influence on the anaerobic biodigestion of the vinasse. The optimal operating parameters were found to be temperatures of 30 - 35°C, inoculum concentration of 0.5% and pH of 6 - 7. The results emphasize the promising use of the treated sugarcane vinasse as a biofertilizer for agriculture, indicating that the anaerobic digestion process is an excellent alternative for Brazilian ethanol industries.

scholarly journals Batch and Semi-Continuous Anaerobic Digestion of Industrial Solid Citrus Waste for the Production of Bioenergy

Processes ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 648
Author(s):  
Erik Samuel Rosas-Mendoza ◽  
Andrea Alvarado-Vallejo ◽  
Norma Alejandra Vallejo-Cantú ◽  
Raúl Snell-Castro ◽  
Sergio Martínez-Hernández ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Oxygen Demand ◽  
Continuous Mode ◽  
Citrus Industry ◽  
Batch Mode ◽  
Volatile Solids ◽  
Working Volume ◽  
Plant Level ◽  
Citrus Waste ◽  
Mesophilic Conditions

The aim of this paper is to describe a study of the anaerobic digestion of industrial citrus solid waste (ISCW) in both batch and semi-continuous modes for the production of bioenergy without the elimination of D-limonene. The study was conducted at the pilot plant level in an anaerobic reactor with a working volume of 220 L under mesophilic conditions of 35 ± 2 °C. Cattle manure (CM) was used as the inoculum. Three batches were studied. The first batch had a CM/ISCW ratio of 90/10, and Batches 2 and 3 had CM/ISCW ratios of 80/20 and 70/30, respectively. In the semi-continuous mode an OLR of approximately 8 g total chemical oxygen demand (COD)/Ld (4.43 gVS/Ld) was used. The results showed that 49%, 44%, and 60% of volatile solids were removed in the batch mode, and 35% was removed in the semi-continuous mode. In the batch mode, 0.322, 0.382, and 0.316 LCH4 were obtained at STP/gVSremoved. A total of 24.4 L/d (34% methane) was measured in the semi-continuous mode. Bioenergy potentials of 3.97, 5.66, and 8.79 kWh were obtained for the respective batches, and 0.09 kWh was calculated in the semi-continuous mode. The citrus industry could produce 37 GWh per season. A ton of processed oranges has a bioenergy potential of 162 kWh, which is equivalent to 49 kWh of available electricity ($3.90).

Effect of total solids content on anaerobic digestion of poultry litter with biochar

2020 ◽  
Vol 255 ◽  
pp. 109744 ◽  
Author(s):  
Mathu Indren ◽  
Cristian H. Birzer ◽  
Stephen P. Kidd ◽  
Paul R. Medwell
Keyword(s):  
Anaerobic Digestion ◽  
Poultry Litter ◽  
Total Solids ◽  
Solids Content

scholarly journals Total solids content: a key parameter of metabolic pathways in dry anaerobic digestion

2013 ◽  
Vol 6 (1) ◽  
pp. 164 ◽  
Author(s):  
Jean-Charles Motte ◽  
Eric Trably ◽  
Renaud Escudié ◽  
Jérôme Hamelin ◽  
Jean-Philippe Steyer ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Metabolic Pathways ◽  
Total Solids ◽  
Solids Content ◽  
Dry Anaerobic Digestion ◽  
Key Parameter

scholarly journals Chemical characterization of faecal sludge in the Kumasi metropolis, Ghana

2017 ◽  
Vol 1 ◽  
pp. 12 ◽  
Author(s):  
Ato Fanyin-Martin ◽  
Wilson Tamakloe ◽  
Edward Antwi ◽  
Johannes Ami ◽  
Emmanuel Awarikabey ◽  
...  
Keyword(s):  
Phosphorus Content ◽  
Oxygen Demand ◽  
Chemical Characterization ◽  
Total Solids ◽  
Typical Treatment ◽  
End Use ◽  
Solids Content ◽  
Faecal Sludge

Background: Faecal sludge (FS) represents a huge resource, which when tapped and made use properly can be of great benefit to many. However, the key to tapping this resource lies in proper characterisation, in order to make known the constituents and thereby determine the end-use. Methods: Three sources of FS from 43 communities in the Kumasi metropolis of Ghana were characterised in terms of their total solids content, chemical oxygen demand (COD), pH, nitrogen, phosphorous and lipid contents. FS from pit latrines, public septage and private septage were analysed. Results: On average, lipid content was found to be in the range of 8.82 – 9.66% of dry FS depending on the source of FS. Total solids were between 0.79 and 4.68%, while the COD was between 9495 and 45611mg/L. Phosphorus content was in the range of 137 – 520mg/L, while nitrogen was 649 – 4479mg/L. Most FS samples were generally alkaline in nature. Conclusions: These results are amongst the first long-term characterization efforts for FS in terms of conventional and non-conventional characteristics, tailored towards typical treatment and novel resource recovery options, respectively.

Effects of total solids content on performance of sludge mesophilic anaerobic digestion and dewaterability of digested sludge

2017 ◽  
Vol 62 ◽  
pp. 188-193 ◽  
Author(s):  
Dong An ◽  
Tianfeng Wang ◽  
Qi Zhou ◽  
Chaosheng Wang ◽  
Qiyong Yang ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Digested Sludge ◽  
Total Solids ◽  
Solids Content

High-solids anaerobic digestion of cassava pulp in semi-continuous bioreactors

BioResources ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. 6723-6736
Author(s):  
Wei Zhao ◽  
Chen-Yu Zhou ◽  
Jun Zhang ◽  
Dun-Qiu Wang
Keyword(s):  
Organic Matter ◽  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
High Solids ◽  
Total Solids ◽  
Loading Rates ◽  
Cassava Pulp ◽  
Volatile Solids ◽  
Organic Matter Loading ◽  
Mesophilic Conditions

The effects of two total solids contents (TS) and two inocula were studied for the semi-continuous high-solids anaerobic digestion (HS-AD) of cassava pulp under mesophilic conditions (35 ± 2 °C). In the 1.0-L bioreactors, two TS of 15% and 20% with digestate as a sole inoculum were chosen to run the HS-AD, and two inocula (the digestate from the AD of cassava pulp and sewage sludge) were used separately under TS 20%. All treatments were carried out at the organic matter loading rates (OLRs) of from 3.0 to 10.0 kg volatile solids (VS)/(m3·d), with each phase of 6 days followed by two 3-days phases of no feeding and then low OLR of 6.5 kg VS/(m3·d). Compared with TS 15%, the bioreactors of TS 20% with the digestate had a higher buffering capability to alleviate the rapid acidification and a higher level of the specific methane yields (SMYs) of from 0.212 to 0.233 m3/(kgVSadded) at the OLRs of 4.0 to 6.5 kgVS/(m3·d), while TS 15% obtained the highest SMY of from 0.152 to 0.182 m3/(kgVSadded) at the OLR of 4.0, 6.5, and 8.0 kgVS/(m3·d). In contrast, sewage sludge did not restrain the rapid acidification and only yielded quite small SMYs under TS 20%.

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