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Analysis of the biogas productivity from dry anaerobic digestion of organic fraction of municipal solid waste

- Matheri, Anthony Njuguna, Sethunya, Vuiswa Lucia, Belaid, Mohamed, Muzenda, Edison, Ntuli, Freeman

Authors: Matheri, Anthony Njuguna , Sethunya, Vuiswa Lucia , Belaid, Mohamed , Muzenda, Edison , Ntuli, Freeman
Date: 2017
Subjects: BMP , Biodegradable , Co-digestion
Language: English
Type: Article
Identifier: http://ujcontent.uj.ac.za8080/10210/380169 , http://hdl.handle.net/10210/241025 , uj:24804 , Citation: Matheri, A.N. 2017. Analysis of the biogas productivity from dry anaerobic digestion of organic fraction of municipal solid waste.
Description: Abstract: In this study, it was observed that in experimental work under laboratory scale using conventional biomethane potential (BMP) analyser under the mesophilic optimum temperature of 37 0C and pH of 7. Organic fraction municipality solid waste (OFMSW) inoculated with cow manure had higher biodegradability rate leading to high methane production under shorter hydraulic retention rate. The co-digestion of OFMSW and cow manure stabilises conditions in digestion process such as carbon to nitrogen (C: N) ratio in the substrate mixtures as well as macro and micronutrients, pH, inhibitors or toxic compounds, dry matter and thus increasing methane production. It was concluded that the organic waste generated in the municipality co-digested with manures to produce methane can be used as a source of sustainable renewable energy.
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Biochemical methane potential analysis using cow dung, chicken manure and pig manure under mesophilic conditions

- Belaid, Mohamed, Matheri, Anthony Njuguna, Mdluli, Nomkhosi Princess, Muzenda, Edison

Authors: Belaid, Mohamed , Matheri, Anthony Njuguna , Mdluli, Nomkhosi Princess , Muzenda, Edison
Date: 2019
Subjects: Anaerobic digestion , Mono-digestion , Co-digestion
Language: English
Type: Conference proceedings
Identifier: http://hdl.handle.net/10210/403895 , uj:33863 , Citation: Belaid, M. et al. 2019. Biochemical methane potential analysis using cow dung, chicken manure and pig manure under mesophilic conditions.
Description: Abstract: In this study, we compared methane production by anaerobic mono-digestion and co-digestion of cow dung, chicken manure and pig manure under mesophilic conditions at the temperature of 37 0 C using a ratio of 1:1. C/N ratio, pH, VS/TS and sulphur content were the parameters investigated. Results indicated that co-digesting of cow dung; pig manure and chicken manure enhanced biogas production and methane content. The results also imply that pig manure cannot be used alone to produce methane as it produced low methane. Chicken manure produced more on the first day (272 Nml) compared to pig manure (257.4 Nml) and cow dung (80.5 Nml). On the ninth day, chicken produced 884 .9 Nml and then on the tenth day it went up again to 1095.6 Nml, reached its peak on day 13 and stopped, chicken yielded better results compared to the cow dung and pig manure because chicken had a higher VS/TS percent which is desirable for methane production. Pig manure started producing methane on the first day which was 257.4 Nml and stopped on the second day with the volume of 262.3 Nml. Pig manure showed poor results compared to cow dung and chicken manure.
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Bridging the digital divide in an African smart city

- Janse van Rensburg, Nickey, Matheri, Anthony Njuguna, Meyer, Johan

Authors: Janse van Rensburg, Nickey , Matheri, Anthony Njuguna , Meyer, Johan
Date: 2019
Subjects: Community , Infrastructure , Smart City
Language: English
Type: Conference proceedings
Identifier: http://hdl.handle.net/10210/402155 , uj:33642 , Citation: Janse van Rensburg, N., Matheri, A.N. & Meyer, J. 2019. Bridging the digital divide in an African smart city.
Description: Abstract: Sustainable transformation of cities is only possible when conducted in a smart way. This research assessed the impact of rolling out free Wi-Fi networks and online services in Johannesburg, South Africa as it relates to the sustainable development of vulnerable communities. Informed by the early adopters of a free Wi-Fi network provided by the City of Johannesburg, participating in the Johannesburg digital ambassadors training programme, the research evaluated smart city enablement in the City of Johannesburg. The case study reviewed relevant smart city metrics and compared to the standard for sustainable development of communities (BS ISO 37120:2014), evaluate indicators for city services and quality of life to identify design criteria for future developments. The results from this study contribute to the enablement of smart city infrastructure development geared toward capacitating vulnerable and previously digitally disadvantaged communities.
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Design model selection and dimensioning of anaerobic digester for the OFMSW

- Matheri, Anthony Njuguna, Mbohwa, Charles, Seodigeng, Tumisang, Ngila, Jane Catherine

Authors: Matheri, Anthony Njuguna , Mbohwa, Charles , Seodigeng, Tumisang , Ngila, Jane Catherine
Date: 2016
Subjects: Belaid, Mohamed , Anaerobic , Co-digestion , Digester
Language: English
Type: Conference proceedings
Identifier: http://hdl.handle.net/10210/214100 , uj:21236 , Citation: Matheri, A.N. et al. 2016. Design model selection and dimensioning of anaerobic digester for the OFMSW.
Description: Abstract: In this study, we investigated the design model selection and dimensioning of the anaerobic digester for the codigestion of different organics fraction of municipal solid waste (OFMSW) originating from the city’s landfills. The waste quantification and characterization exercise were undertaken at the point of generation, so as to obtain the total amount of waste generated and to ascertain the waste composition. Via the application of the simple multi-attribute rating (SMART) technique of multiple-criteria decision analysis (MCDA) as a decision support tool base on cost, scalability, temperature regulation, ease of construction, operation, and maintenance. The most preferred model option for bioenergy design technology was selected from a list of potential alternatives available in the market. Continuous stirred tank reactor (digester) CSTR scored the highest with 79% and was selected for the design in OFMSW biogas production. The geometry of the biodigester parameters was comparable with the anaerobic digestion (AD) process.
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Evaluation of polymeric membranes efficacy for the water filtration system prototype

- Empompo, Jonathan Bambokela, Muzenda, Edison, Belaid, Mohammed, Matheri, Anthony Njuguna

Authors: Empompo, Jonathan Bambokela , Muzenda, Edison , Belaid, Mohammed , Matheri, Anthony Njuguna
Date: 2017
Subjects: efficiency , filtration , membranes
Language: English
Type: Conference proceedings
Identifier: http://hdl.handle.net/10210/250294 , uj:26078 , Citation: Empompo, J.B. et al. 2017. Evaluation of polymeric membranes efficacy for the water filtration system prototype. 2nd International Engineering Conference (IEC 2017) Federal University of Technology, Minna, Nigeria.
Description: Abstract: The issue of potable water in the poorest region of the world has never been a conceptual issue only but a financial and technical issue as well. This study aimed at evaluating the efficiency of four polymeric membranes by predicting their performance in terms of particle separation, permeability and mechanical strength. These membranes are to be placed in the purification section of a Water Filtration System (WFS) to obtain pure or non-turbid water for human consumption. This study introduced a microfiltration set-up connected to a solar power system as the beacon of hope for poorest regions of the world in order to eradicate the limited access to potable water.
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Green energy (biomethane) production from codigestion of abattoir, market and grass waste as substrates

- Matheri, Anthony Njuguna, Mwiinga, Masonga Sichibanze, Zelda, Rasmeni Zenzile, Mohamed, Belaid

Authors: Matheri, Anthony Njuguna , Mwiinga, Masonga Sichibanze , Zelda, Rasmeni Zenzile , Mohamed, Belaid
Date: 2019
Subjects: Biogas , Biomethane , Digestion
Language: English
Type: Conference proceedings
Identifier: http://hdl.handle.net/10210/402179 , uj:33645 , Citation: Matheri, A.N. et al. 2019. Green energy (biomethane) production from codigestion of abattoir, market and grass waste as substrates.
Description: Abstract: South Africa had in the past years been experiencing an increased energy demand. High energy crisis called for research and development in a quest for alternative energy sources (waste to energy) that drive the Nation economy forward in line with Sustainable and National development goals. Utilizing organic waste to produce biogas as a source of energy could significantly help alleviate this problem. Biogas is renewable energy, a mixture primarily consisting of methane (CH4) and carbon dioxide (CO2). The study evaluated mono-digestion of market waste (MW), abattoir waste (AW), and grass (G) and co-digestion of the three mix of substrate by determining their biomethane potential under mesophilic conditions of 37oC. It was found that the mono-digestion of grass produced high methane (1035.3 Nml) after the stipulated 14 days of hydraulic retention time, Abattoir waste, and market waste produced 722.1 Nml and 470.7 Nml of methane respectively, and the co- digestion of all substrates produced 1013.1 Nml of methane after 14 days. Co-digestion of the substrates assisted to regulate the anaerobic digestion condition or variables for biomethane production. Co-digestion of the substrate was recommended for optimality or increase in methane yield.
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Impact of Co-digesting food waste with cow dung

- Empompo, Jonathan Bambokela, Niangi, Glodi Mayala, Matheri, Anthony Njuguna, Muzenda, Edison, Belaid, Mohammed

Authors: Empompo, Jonathan Bambokela , Niangi, Glodi Mayala , Matheri, Anthony Njuguna , Muzenda, Edison , Belaid, Mohammed
Date: 2017
Subjects: Co-digestion , Cow dung , Food waste
Language: English
Type: Conference proceedings
Identifier: http://hdl.handle.net/10210/250718 , uj:26131 , Citation: Empompo, J.B. et al. 2017. Impact of Co-digesting food waste with cow dung. 2nd International Engineering Conference (IEC 2017) Federal University of Technology, Minna, Nigeria.
Description: Abstract: Producing energy from fossil fuels has created unliveable conditions. Climate change for instance, is one of the most environmental issue of our time. Renewable energy, clean source of energy, is considered as an essential part of the remedy. In this study, we investigated the production of biomethane via anaerobic monodigestion of food waste (FW) and co-digestion of FW with cow dung. The digestion took place under thermophilic conditions at 45˚C. A comparative analysis was done on the biogas yield of both mono and co-digestion. FW, FW and cow dung of the ratios, 2:1 and 1:2 were used as the substrates in the digestion. The anaerobic monodigestion of FW displayed the highest biomethane yield produced, of 405.1 Nml. Two main parameters helped in achieving that, volatile solids content (VS) and total solids content (TS). In addition to the two parameters, the pH and the C/N ratio helped in enhancing the biomethane production of both mono and co-digestion. As the objective is the optimization of the biomethane yield by co-digestion, co-digesting FW with cow dung resulted in decreasing considerably the biomethane yield by 32.16 to 33.99%.
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Mathematical modelling for biogas production

- Matheri, Anthony Njuguna

Authors: Matheri, Anthony Njuguna
Date: 2016
Subjects: Sewage - Purification - Anaerobic treatment , Sewage - Purification - Mathematical models , Renewable energy sources , Biomass energy , Biogas
Language: English
Type: Masters (Thesis)
Identifier: http://hdl.handle.net/10210/213006 , uj:21066
Description: Abstract: The main focus of this dissertation is the experimental, modelling and simulation of anaerobic digestion processes from pilot bio-digesters. For this purpose, biochemical kinetic models were utilized together with corresponding simulation software; DYNOCHEM. By application of the anaerobic digestion (AD), different parameters have been investigated and simulated including adjustments of the process model and corresponding modifications. To validate the process model, the modelled data was compared with experimental monitored laboratory results. Bio-chemical kinetics modelling was applied as a systematic tool in order to support the process design and optimization of a demonstration of the biogas processes which constitutes the main scientific framework and background of this dissertation. Monitored laboratory-scale biogas production data were used for parameter calibration in order to predict plant performance. The calibration focused on the influent characterization of both substrates and on selection of kinetic of the coefficients in order to generate a uniform set of parameters which are applicable for the simulation of codigestion. In this study, it was observed that the experiment work under laboratory scale using conventional bio-methane potential (BMP) analyzers under mesophilic optimum temperature of 35 oC and 37 oC, and pH of 7 for co-digestion of organic fraction of municipal solid waste (OFMSW) with cow dung and manure with grass clippings. The substrate characterization moisture content ranged from 60-95%, volatile content 55-95%, total solid 10-90% and carbon to nitrogen ratio 16-20 for manure and 5-15 for OFMSW. All trace elements concentration were below the threshold of 32 mg/l that leads to inhibition of micro-organisms activity. The rate of conversion increased with retention time. According to the findings, 54-62% of methane composition was evaluated. The kinetics constant evaluated ranged from 0.009-0.35 d-1 and coefficient of determination (R2) ranged from 0.9989-0.9998. The Michaelis-Menten and Monod models provided goodness of fit of 0.9997 with confidential level of 95%. The simulations confirmed that the rate of conversion increased as temperature increases and conversion of reactants increased with retention time, until an equilibrium state was reached. The AD process modelling using DYNOCHEM was successfully modified and implemented to account for unsteady operation which is generally the case of full-scale reactor by developed methodology. , M.Tech. (Chemical Engineering)
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Mesophilic anaerobic co-digestion of cow dung, chicken droppings and grass clippings

- Matheri, Anthony Njuguna, Belaid, Mohamed, Seodigeng, Tumisang, Ngila, Catherine Jane, Mbohwa, Charles

Authors: Matheri, Anthony Njuguna , Belaid, Mohamed , Seodigeng, Tumisang , Ngila, Catherine Jane , Mbohwa, Charles
Date: 2016
Subjects: Anaerobic digestion , Co-digestion , Mesophilic temperature
Language: English
Type: Conference proceedings
Identifier: http://hdl.handle.net/10210/214105 , uj:21240 , Citation: Matheri, A.N. et al. 2016. Mesophilic anaerobic co-digestion of cow dung, chicken droppings and grass clippings.
Description: Abstract: The main focus of this study was mesophilic anaerobic co-digestion of cow dung, chicken droppings and grass clippings using pilot bio-digesters. The biochemical methane potential (BMP) works under batch anaerobic digester operating in ambient mesophilic temperature of 35 oC and 37 0C and pH of 7 to generate biogas. The carbon/nitrogen (C/N) ratio for cow dung and chicken droppings was found to be 17.70 and 63.67 respectively and grass clippings to be 20.54. Through co-digestion in a ratio of 1:1, the C/N ratio for cow dung and grass clippings settled at 19.19 while that for chicken droppings and grass clippings settled at 20.49. The conversion rate of the reaction and biogas production increased with the increase in temperature and hydraulic retention time until an equilibrium state was achieved. At the temperature 37 OC, it was observed to be the suitable mesophilic temperature for anaerobic digestion due to high dissociation and collision leading to high rate of biogas production.
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Modelling the kinetic of biogas production from co-digestion of pig waste and grass clippings

- Matheri, Anthony Njuguna, Belaid, Mohamed, Seodigeng, Tumisang, Ngila, Catherine Jane

Authors: Matheri, Anthony Njuguna , Belaid, Mohamed , Seodigeng, Tumisang , Ngila, Catherine Jane
Date: 2016
Subjects: Anaerobic , Co-digestion , Kinetics , Mesophilic temperature , Modified gompertz
Language: English
Type: Conference proceedings
Identifier: http://hdl.handle.net/10210/93635 , uj:20372 , Citation: Matheri, A.N. et al. 2016. Modelling the kinetic of biogas production from co-digestion of pig waste and grass clippings.
Description: Abstract: This work investigated the use of laboratory batch anaerobic digester to derive kinetics parameters for anaerobic co-digestion of pig waste and grass clippings. Laboratory experiment data from 10 litres batch anaerobic digester operating at ambient mesophilic temperature of 37 0C and pH of 6.9 was used to derive parameters for modified Gompertz model. The carbon/nitrogen (C/N) ratio of Pig waste was found to be 16.16 and grass clippings to be 20.54. Through co-digestion in ratio of 1:1, the C/N ratio settled at 17.28. The actual biogas yield was found to be 7725 ml/g COD. In the model of biogas production prediction, the kinetics constants of A (ml/g COD), μ (ml/g COD. day), λ (day) was 7920.70, 701.35, 1.61 respectively with coefficient of determination (R2) of 0.9994. Modified Gompertz plot showed better correlation of cumulative biogas production and these results show biogas production can be enhanced from co-digestion of substrates.
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Multi-criteria analysis of different technologies for the bioenergy recovery from OFMSW

- Matheri, Anthony Njuguna, Mbohwa, Charles, Belaid, Mohamed, Seodigeng, Tumisang, Ngila, Jane Catherine

Authors: Matheri, Anthony Njuguna , Mbohwa, Charles , Belaid, Mohamed , Seodigeng, Tumisang , Ngila, Jane Catherine
Date: 2016
Subjects: Anaerobic digester , Design , Bioenergy recovery
Language: English
Type: Conference proceedings
Identifier: http://ujcontent.uj.ac.za8080/10210/377197 , http://hdl.handle.net/10210/214131 , uj:21242 , Citation: Matheri, A.N. et al. 2016. Multi-criteria analysis of different technologies for the bioenergy recovery from OFMSW.
Description: Abstract: In this study, the multi-criteria analysis model is demonstrated for evaluation and technologies from municipal solid waste (MSW) in City of Johannesburg (CoJ), South Africa. The technologies evaluation and alternation criteria for multi-criteria decision analysis (MCDA) area characterized by reviewing the literature and consulting experts in the renewable energy and waste management. MCDA was the approach employed by decision makers to make recommendation on technique employed to select the most suitable biogas digester technology for organic fraction of municipal solid waste (OFMWS) originating from the city’s landfills base on scalability, relative cost prices, available, temperature regulation, agitation, ease of construction, operation and maintenance. The result for digester type indicated that the “complete mix, continuously stirred anaerobic digester” (CSAD) was preferred with 79% preference to other anaerobic digester technologies for energy recovery.
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Optimization of Biogas Production from sewage sludge

- Belaid, Mohamed, Matheri, Anthony Njuguna, Lelosa, Itumeleng Constance, Muzenda, Edison, Ramatsa, Ishmael

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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Optimization of biomethane production by anaerobic co-digestion of food waste with cow dung

- Empompo, Jonathan Bambokela, Mayala, Glodi Niangi, Matheri, Anthony Njuguna, Muzenda, Edison, Belaid, Mohammed

Authors: Empompo, Jonathan Bambokela , Mayala, Glodi Niangi , Matheri, Anthony Njuguna , Muzenda, Edison , Belaid, Mohammed
Date: 2017
Subjects: Anaerobic co-digestion , Anaerobic monodigestion , Biomethane
Language: English
Type: Conference proceedings
Identifier: http://ujcontent.uj.ac.za8080/10210/364987 , http://hdl.handle.net/10210/250680 , uj:26127 , Citation: Empompo, J.B. et al. 2017. Optimization of biomethane production by anaerobic co-digestion of food waste with cow dung. 2nd International Engineering Conference (IEC 2017) Federal University of Technology, Minna, Nigeria.
Description: Abstract: The world today is in a constant quest of generating clean energy which would considerably reduce the emission of greenhouse gas (GHG) for better living conditions. In this study, a comparative analysis between anaerobic mono-digestion and anaerobic co-digestion of food waste (FW) was conducted based on the following parameters; pH, carbon to nitrogen (C/N) ratio, total solids (TS) and volatile solids (VS) content. For anaerobic monodigestion FW alone was used as the substrate while for anaerobic co-digestion, two mixing ratios of FW with cow dung were used (2:1 and 1:2 respectively). Three digesters of 500 ml were used and placed into a water bath at 45°C through a Biochemical Methane Potential (BMP) Test using the Automatic Methane Potential Test System II (AMPTS II). The anaerobic mono-digestion of FW yielded 405.1 Nml of biomethane while the anaerobic co-digestion of FW with cow dung yielded 267.4 and 274.8 Nml at 2:1 and 1:2 mixing ratios correspondingly. The anaerobic co-digestion showed a significant decrease in the specific biogas production by 32.16 to 33.99% in comparison to anaerobic monodigestion. It was observed that the pH (7.21), C/N (31.41), TS (14.64%) and VS/TS (94.4%) of anaerobic mono-digestion of FW fell approximately and within their respective optimum range, 6.5 – 7.5, 15 – 30, 15 – 20% and 82.4 – 95.3%. Hence, it produced the best biomethane yield. The objective of this study was to prove that anaerobic co-digestion of FW with cow dung would produce an improved biogas yield as compared to anaerobic monodigestion.
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Sludge to energy recovery dosed with selected trace metals additives in anaerobic digestion processes

- Matheri, Anthony Njuguna, Ntuli, Freeman, Ngila, Jane Catherine

Authors: Matheri, Anthony Njuguna , Ntuli, Freeman , Ngila, Jane Catherine
Date: 2020
Subjects: Additive , Anaerobic digestion , Biomethane
Language: English
Type: Article
Identifier: http://hdl.handle.net/10210/460010 , uj:40920 , Citation: Matheri, A.N., Ntuli, F. & Ngila, J.C. 2020. Sludge to energy recovery dosed with selected trace metals additives in anaerobic digestion processes.
Description: Abstract: The energy demand is ever rising with population increase and technology evolution. Coal consumption in South Africa is estimated to be 86% of the total energy demand. It has a high magnitude of environmental pollution and contributes to climate change. This calls for cleaner, reliable, sustainable, decarbonized, decentralized, affordable, digitized with the diversification of energy mix. The study aimed at investigating the impact of dosing selected trace metals (Ni, Co, Cu) as an additive to the substrate in the sludge to energy recovery using anaerobic processes. Sewage sludge and cellulose were used as a substrate. The biomethane potential study was carried from a 500 ml batch automated bio-digester at a mesophilic temperature of 37oC and a substratum-to-inoculum ratio (2:1) of the organic load rate. The dosed micro-nutrients acted as microbial-agents responsible for the anaerobic digestion of the feedstock. Cellulose and sludge at 0.25 mg/L (Ni) recorded the highest production of the biomethane. Cellulose inoculated with cobalt had better biomethane production at 0.02 mg/L until 0.05 mg/L. High production of biomethane was observed at the substrate with a copper concentration of 4.5 mg/L. Adding trace metals to microbial cell surroundings stimulated microbial activity and prevented the accumulation of the fatty acids. However, high concentrations beyond threshold resulted in inhibition, toxicity to the microbial-growth, which was reflected in the reduction of the production of biomethane.
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The kinetic of biogas rate from cow dung and grass clippings

- Matheri, Anthony Njuguna, Belaid, Mohammed, Seodigeng, Tumisang, Ngila, Catherine Jane

Authors: Matheri, Anthony Njuguna , Belaid, Mohammed , Seodigeng, Tumisang , Ngila, Catherine Jane
Date: 2016
Subjects: Anaerobic digestion , Kinetic models , Modified Gompertz
Language: English
Type: Conference proceedings
Identifier: http://hdl.handle.net/10210/91512 , uj:20110 , Citation: Matheri, A.N. et al. 2016. The kinetic of biogas rate from cow dung and grass clippings.
Description: Abstract:In this study, we investigated the use of laboratory batch anaerobic digester to derive kinetics parameters for anaerobic co-digestion of cow dung and grass clippings. The Carbon/Nitrogen (C/N) ratio of cow dung was found to be 17.17 and grass clippings to be 20.54. Through co-digestion, the C/N ratio settled at 19.08. Laboratory experimental data from 10 litres batch anaerobic digester operating at mesophilic temperature of 37 0C and pH of 6.9 was used to derive parameters for Modified Gompertz model. The actual biogas yield was found to be 4370 ml/g COD. In the model of biogas production prediction, the kinetics constants of A (ml/g COD), μ (ml/g COD. day), λ (day) were 4319.20, 939.71, 1.91 respectively with coefficient of determination (R2) of 0.996.
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The role of trace elements on anaerobic codigestion in biogas production

- Matheri, Anthony Njuguna, Belaid, Mohamed, Seodigeng, Tumisang, Ngila, Jane Catherine

Authors: Matheri, Anthony Njuguna , Belaid, Mohamed , Seodigeng, Tumisang , Ngila, Jane Catherine
Date: 2016
Subjects: Anaerobic digestion , Co-digestion , Mesophilic temperature , Trace elements
Language: English
Type: Conference proceedings
Identifier: http://hdl.handle.net/10210/93628 , uj:20371 , Citation: Matheri, A.N. et al. 2016. The role of trace elements on anaerobic codigestion in biogas production.
Description: Abstract: In this study, we investigated the concentration of trace elements in the digestates in a laboratory batch anaerobic digester. Many of these trace elements are important macro and micro nutrients. The availability of these nutrients for microbes responsible for anaerobic digestion and substrate toxicity have to be controlled in biogas production. The analyzed substrates were characterized at various concentrations in the following trace elements; potassium, phosphorus, manganese, copper, calcium, molybdenum, zinc, cobalt, iron, aluminum, silver, nickel and cadmium. Trace elements like copper, silver, nickel, cadmium, zinc have been reported to be inhibitory and toxic under certain conditions in biochemical reaction depending on their concentrations. These trace elements lower biogas production above threshold concentration due to accumulation of organic acid as a result of methanogenic bacterial inhibition. There was no deficit of nutrients detected in the anaerobic digesters analysis.
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Waste to energy bio-digester selection and design model for the organic fraction of municipal solid waste

- Matheri, Anthony Njuguna, Mbohwa, Charles, Ntuli, Freeman, Belaid, Mohamed, Seodigeng, Tumisang, Ngila, Jane Catherine, Njenga, Cecilia Kinuthia

Authors: Matheri, Anthony Njuguna , Mbohwa, Charles , Ntuli, Freeman , Belaid, Mohamed , Seodigeng, Tumisang , Ngila, Jane Catherine , Njenga, Cecilia Kinuthia
Date: 2017
Subjects: Anaerobic digestion , Bio-digester , Mesophilic temperature
Language: English
Type: Article
Identifier: http://hdl.handle.net/10210/250904 , uj:26157 , Citation: Matheri, A.N. et al. 2017. Waste to energy bio-digester selection and design model for the organic fraction of municipal solid waste.
Description: Abstract: Please refer to full text to view abstract
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