Optimization of Biogas Production from sewage sludge
- Authors: Belaid, Mohamed , Matheri, Anthony Njuguna , Lelosa, Itumeleng Constance , Muzenda, Edison , Ramatsa, Ishmael
- Date: 2019
- Subjects: Anaerobic digestion , Co-digestion , Mesophilic temperature
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/403887 , uj:33862 , Citation: Belaid, M. et al. 2019. Optimization of Biogas Production from sewage sludge.
- Description: Abstract: It is widely known that the degradation of waste activated sludge is a slow process with a low extent of degradation. Improvement methods with regards to bio-methane yield were investigated in this study using a laboratory batch anaerobic digester. Mono-digestion of sludge with a C: N ratio of 15.47 resulted in a lower accumulation of gas volume than co-digested sludge even though the pH decreased rapidly in both cases. The thermophillic anaerobic digestion of sludge and co-digested sludge also produced higher bio-methane yield than mesophillic digestion of waste water sludge. Gas accumulation volume in the digesters during thermophillic digestion increased from 50 Nml to 100 Nml, 200 Nml to 600 Nml and 600 Nml to 750 Nml for sludge, cow dung and sludge and sludge and food waste respectively as the temperature was increased from 37o C to 45o C.
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The effect of leaching time and ammonia concentration on the atmospheric leaching of copper
- Authors: Ntuli, Freeman , Muzenda, Edison , Ramatsa, Ishmael , Belaid, Mohamed , Kabuba, John
- Date: 2013
- Subjects: Ammonia , Cementation , Concentration , Leaching
- Language: English
- Type: Conference
- Identifier: http://hdl.handle.net/10210/17348 , uj:15872 , F. Ntuli, E. et al. 2013. The effect of leaching time and ammonia concentration on the atmospheric leaching of copper. 2nd International Conference on Chemistry and Chemical Engineering, IPCBEE vol.14, Singapore 2011. Cited by: KG Tshilombo, AF Mulaba-Bafubiandi - Magnesium, 2013 - psrcentre.org
- Description: Abstract: Please refer to full text for abstract.
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The effect of leaching time and ammonia concentration on the atmospheric leaching of copper
- Authors: Ntuli, Freeman , Muzenda, Edison , Ramatsa, Ishmael , Belaid, Mohamed , Kabuba, John
- Date: 2011
- Subjects: Copper recovery , Leaching , Ammonia concentrations
- Type: Article
- Identifier: uj:5319 , ISSN 2010-4618 , http://hdl.handle.net/10210/8195
- Description: The effects of ammonia concentration and leaching time were investigated to determine the optimum leaching conditions. The experiments were conducted in a leaching cell submerged in a water bath, with ammonia concentrations of 1.5 M, 2.0 M, 2.5 M and 3.0 M and varying leaching time from 0 to 300 min. Ni-Cu matte containing 23% by mass Cu was used in this experimental study. Increase in the concentration of the lixiviant was found to increase recovery when leaching for 130 minutes, with a recovery of 32.86% Cu using 3 M solution of ammonia. An increase in the leaching time resulted in more copper being leached for all lixiviant concentrations. However, leaching with 2 M ammonia solution gave a higher yield of copper compared to higher concentrations. This anomaly could be a result of cementation; Cu is displaced by Ni as Ni is a more electronegative metal than Cu .It was found that at higher concentrations more nickel was extracted.
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Effect of nutrient addition during anaerobic digestion of potato peels and maize husk
- Authors: Ramatsa, Ishmael , Sibiya, Noxolo , Huberts, Roberth
- Date: 2014
- Subjects: Anaerobic bacteria , Renewable energy sources , Biomass energy , Biogas
- Type: Article
- Identifier: uj:5091 , http://hdl.handle.net/10210/13681
- Description: The composition of the substrate and nutrients addition plays a very significant role during the production of the biogas. For this reason this paper tries to evaluate the effect of nutrients addition during biogas production under anaerobic conditions. Potato peels wastes and maize husk were anaerobically digested in a 5 liter scale reactor at mesophilic conditions (32 o C). The characteristics of the potato peels were and maize husk are presented in Table 1. The results obtained indicated that the addition of the nutrients during anaerobic digestion has an influence on the biogas production, meanwhile methane content in biogas varied from 48 to 64%.
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