Browsing Research Articles [MEWES] by Author "Njau, Karoli"
Now showing items 21-40 of 114
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Computational dynamics of solid waste generation and treatment in the presence of population growth
Senzige, J; Makinde, O; Njau, Karoli; Gyekye, Nkansah (Asian Journal of Mathematics and Applications, 2014-05-08)Solid waste management is a global challenge and the situation is worse in urban areas of the developing countries where, in most cases, there are no data of how much solid waste is generated over a specific period of ... -
Conceptualization of groundwater-surface water interaction with evidence from environmental isotopes and hydrogeochemistry in lake Babati Basin in Northern Tanzania
Okwir, Gustavio; Kumar, Sudhir; Pramod, Kumar; Gao, Hongkai; Njau, Karoli (Elsevier, 2023-05)The holistic management of water resources is attainable with evidence-based planning constructed on reliable hydrological information. However, data paucity, especially in sub-Saharan Africa, leads to a significant knowledge ... -
Conceptualizing the Fe0/H2O System: A Call for Collaboration to Mark the 30th Anniversary of the Fe0-Based Permeable Reactive Barrier Technology
Cao, Viet; Bakari, Omari; Tchidjo, Joseline; Bandjun, Nadège; Tchoupé, Arnaud; Gwenzi, Willis; Njau, Karoli; Noubactep, Chicgoua (MDPI, 2022-10-03)Science denial relates to rejecting well-established views that are no longer questioned by scientists within a given community. This expression is frequently connected with climate change and evolution. In such cases, ... -
Contamination of groundwater sources in emerging African towns: the case of Babati town, Tanzania
Pantaleo, P. A.; Komakech, Hans; Mtei, Kelvin; Njau, Karoli (Water Practice & Technology, 2018)Assessment of groundwater contamination potential was carried out in Babati, Manyara, Tanzania. Diazotization, cadmium reduction, ascorbic acid, ion selective electrode and membrane filtration analytical methods were used, ... -
Current status of textile wastewater management practices and effluent characteristics in Tanzania
Bidu, Jerome; Van der Bruggen, Bart; Rwiza, Mwemezi; Njau, Karoli (IWA Publishing, 2021-04-05)Textile wastewater from wet processing units is a major environmental problem. Most chemicals, including dyes, are only partly consumed, resulting in highly colored wastewater containing a variety of chemicals released ... -
Data from the batch adsorption of ciprofloxacin and lamivudine from synthetic solution using jamun seed (Syzygium cumini) biochar: Response surface methodology (RSM) optimization
Ripanda, Asha; Rwiza, Mwemezi; Nyanza, Elias; Bakari, Ramadhani; Miraji, Hossein; Njau, Karoli; Vuai, Said; Machunda, Revocatus (Elsevier, 2023-02)This dataset expresses the experimental data on the batch adsorption of ciprofloxacin and lamivudine from synthetic solution using jamun seed (JS) (Syzygium cumini) biochar. Independent variables including concentration ... -
Development of a cost-benefit analysis approach for water reuse in irrigation
Kihila, Jacob; Mtei, Kelvin; Njau, Karoli (Science Publishing Group, 2014-10-10)Water reuse is one of the alternatives to counteract the already experienced water shortages. However water reuse as any other investment is associated with costs. This article looks at water reuse for irrigation as one ... -
Distribution of organic carbon: possible causes and impacts in the Pangani River Basin ecosystem, Tanzania
Selemani, Juma; Zhang, Jing; Muzuka, Alfred; Wu, Ying; Njau, Karoli; Zhang, Guosen; Mzuza, Maureen; Maggid, Arafa; Zhang, Miao; Qi, Lijun (CSIRO PUBLISHING, 2018-06-08)There is limited information on organic carbon in African rivers, especially from the eastern side. Here, we report distribution and impacts of total suspended matter (TSM), and dissolved and particulate organic carbon ... -
Effect of Glass Thickness on Performance of Flat Plate Solar Collectors for Fruits Drying
Bakari, Ramadhani; Minja, Rwaichi; Njau, Karoli (Hindawi Publishing Corporation, 2014)This study aimed at investigating the effect of thickness of glazing material on the performance of flat plate solar collectors. Performance of solar collector is affected by glaze transmittance, absorptance, and reflectance ... -
Effect of mixing ratios of natural inorganic additives in removing ammonia and sulfide in the liquid phase during anaerobic digestion of slaughterhouse waste
Mutegoa, Eric; Malima, N; Hilonga, Askwar; Njau, Karoli (Elsevier, 2021-06-01)In this study, the efficacy of inorganic additives in the removal of total ammonia nitrogen (TAN) and sulfide in the aqueous phase of slaughterhouse waste undergoing anaerobic digestion in the batch reactor was investigated. ... -
Effects of wastewater characteristics on fish quality from integrated wastewater treatment system and fish farming in Urban Areas, Tanzania
Mkali, Ahamdi; Ijumba, Jasper; Njau, Karoli (Scientific Research Publishing, 2014-09-10)Availability of suitable water is one of the most important limiting factors for development of sustainable aquaculture in the urban areas. As a consequence, the use of wastewater effluents for aquaculture is on the rise ... -
Effects of zero-valent iron on sludge and methane production in anaerobic digestion of domestic wastewater
Bakari, Omari; Njau, Karoli; Noubactep, Chicgoua (Elsevier, 2023-12-08)Iron metal (Fe0) materials enhance the performance of anaerobic digestion (AD) reactors to remove pollutants. Most research focused on the materials' mechanisms and effectiveness in enhancing AD. However, there is scant ... -
Eggshells – assisted hydrolysis of banana pulp for biogas production
Kivuyo, Lazaro; Njau, Karoli; King’ondu, Cecil (2017-01-27)In this study, pretreatment of banana pulp using eggshells in both calcined and un-calcined forms to examine the extent of hydrolysis was conducted. Reactor CO containing banana pulp and inoculum but with no eggshells added ... -
Electrospun carbon nanofibers for use in the capacitive desalination of water
Tarus, Bethwel; Jande, Yusufu; Njau, Karoli (Elsevier, 2022-12)Capacitive deionization (CDI) has rapidly become a promising approach for water desalination. The technique removes salt from water by applying an electric potential between two porous electrodes to cause adsorption of ... -
Energy Recovery from Municipal Solid Waste
Omari, Arthur; Njau, Karoli; Mtui, Peter; John, Geoffrey (Regional Collaboration Conference, 2014-07)Energy flow analysis and thermal degradation of municipal solid waste was carried out using differential scanning calorimetry and thermo-gravimetric analyzer at heating rates of 10 K/min, 20 K/min, 30 K/min and 40 K/min ... -
Energy Recovery routes from Municipal Solid Waste : A case study of Arusha-Tanzania
Omari, Arthur; Said, Mahir; Njau, Karoli; John, Geoffrey; Mtui, Peter (Journal of Energy Technologies and Policy, 2014)A study of energy recovery from municipal solid waste was undertaken. The energy content of the solid waste is 12MJ/kg. The elemental composition shows that the municipal solid waste contains 50% and 5% of carbon and hydrogen ... -
Environmental Contamination By Radionuclides And Heavy Metals Through The Application Of Phosphate RocksDuring Farming And Mathematical Modeling Of Their Impacts To The Ecosystem
Lema, Meserecordias; Ijumba, Jasper; Njau, Karoli; Ndakidemi, Patrick (nternational Journal of Engineering Research and General Science, 2014-07)Most of rock phosphates contain radioactive elements and heavy metals because theyoriginate from phosphate deposits. The application of these rock phosphates may result to the transfer of these dangerous materials into ... -
Estimating Conveyance Efficiency and Maize Productivity of Traditional Irrigation Systems in Usa River Catchment, Tanzania
Haymale, Humuri; Njau, Karoli; Kahimba, Frederick (Hindawi, 2020-07-30)Estimating the conveyance efficiency of traditional irrigation schemes systems is very important. It is because of understanding the volume of water lost along with the transportation facility, enhancing water usage and ... -
Evaluating the level of ammonia and sulfide in the liquid phase during anaerobic digestion of slaughterhouse waste operating at mesophilic scale digester—the impact of inhibition and process performance
Mutegoa, Eric; Kandola, Isack; Hilonga, Askwar; Njau, Karoli (AIMS Press, 2020-07-10)The performance of experimental batch-reactor loaded with slaughterhouse waste at mesophilic temperature was investigated as well as the inhibition of both ammonia and sulfide concentration in the aqueous phase. The digester ... -
Experimental analysis of air flow patterns in perfomance of flat plate solar collectors
Bakari, Ramadhani; Minja, Rwaichi; Njau, Karoli (African Journal of Agricultural Research, 2015-02-05)Solar drying is one of the promising methods of reducing post-harvest losses in rural areas. Studies have shown that, heat transfer mechanisms in a solar collector influences the performance of solar dryers. This study ...