Browsing Research Articles [MEWES] by Author "Njau, Karoli"
Now showing items 1-20 of 114
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Agrochemicals use in horticulture industry in Tanzania and their potential impact to water resources
Lema, Emmy; Machunda, Revocatus; Njau, Karoli (International Journal of Biological and Chemical Sciences, 2014-04)The objective of this review was to analyze the existing information on the use of agrochemicals (Fertilizers and Pesticides) in the Tanzanian horticulture industry especially the Northern regions and their potential to ... -
Alternative tanning technologies and their suitability in curbing environmental pollution from the leather industry: A comprehensive review.
China, Cecilia; Maguta, Mihayo; Nyandoro, Stephen; Hilonga, Askwar; Kanth, Swarna; Njau, Karoli (Elsevier Ltd., 2020-04-18)Chrome tanning remains the most favourite technology in the leather industry worldwide due to its ability to produce leather with attributes desirable for high-quality leather such as excellent hydrothermal stability, ... -
Anaerobic digestion of banana winery effluent for biogas production
Bakili, Sophia; Gessesse, Amare; Mtei, Kelvin; Njau, Karoli (International Journal of Environmental Protection and Policy, 2014-09-30)he efficiency of banana winery effluent (BWE) in biogas production through improving fermentation process was investigated in this study. The study was conducted in a batch system under mesophilic temperature of 35oC ... -
Anaerobic treatment of tannery wastewater using ASBR for methane recovery and greenhouse gas emission mitigation
Mekonnen, Anduale; Letaa, Seyoum; Njau, Karoli (Elsevier, 2017-10)The objective of this study was to develop and optimize a pilot scale Anaerobic Sequencing Batch Reactor (ASBR) for the treatment tannery wastewater and reduction of greenhouse gas emission. The performance of the pilot ... -
Analysis of Different Techniques for Improving Performance of Flat Plate Solar Collectors for Fruits Drying
Bakari, Ramadhani; Minja, Rwaichi; Njau, Karoli (Tanzania Journal of Engineering and Technology (TJET), 2014-06)Fruits drying had become a broader technology in fruits and vegetables value addition. The technology is reported to be a promising way of dying without incurring higher cost but its adaptation has not been feasible in ... -
Antibiotic-resistant microbial populations in urban receiving waters and wastewaters from Tanzania
Ripanda, Asha; Rwiza, Mwemezi; Nyanza, Elias; Miraji, Hossein; Bih, Numfor; Mzula, Alexanda; Mwega, Elisa; Njau, Karoli; Vuai, Said; Machunda, Revocatus (Elsevier, 2023)Antimicrobial resistance against certain medications in the pathogenic microbial community is globally increasing due to the continual discharge and disposal of pharmaceuticals in the environment. The phenomenon resulted ... -
The application of nutrient budget models to determine the ecosystem health of the Wami Estuary, Tanzania
Kiwango, Halima; Njau, Karoli; Wolanskic, Eric (Elsevier, 2018-04)Using the LOICZ and the UEE models we estimated the nutrient budget in the Wami River estuary, Tanzania, to better understand the functioning of the ecosystem and assess its health. We found that during the wet season, ... -
Application of up-flow anaerobic sludge blanket reactor integrated with constructed wetland for treatment of banana winery effluent
Paschal, Charles; Njau, Karoli; Gastory, L; Katima, J (IWA Publishing, 2017-08-01)Agroprocessing constitutes sizeable industries in the Eastern Africa region discharging wastes into the environment. Proper management of industrial waste is perceived as expensive and enforcement of laws is weak. Generally, ... -
Approaches to the mitigation of ammonia inhibition during anaerobic digestion – a review
Mutegoa, Eric; Hilonga, Askwar; Njau, Karoli (IWA Publishing, 2020-06-03)The digestion process of organic waste rich in high ammonia content has always been a gridlock during methanogenesis process. The free ammonia may increase inhibition/toxicity, which in turn affects the microbial community ... -
Assessing the Impacts of Land Use and Climate Changes on River Discharge towards Lake Victoria
James, Renatus; Amasi, Aloyce; Wynants, Maarten; Nobert, Joel; Mtei, Kelvin; Njau, Karoli (MDPI, 2023-05-08)The Lake Victoria basin’s expanding population is heavily reliant on rainfall and river flow to meet their water needs, making them extremely vulnerable to changes in climate and land use. To develop adaptation and ... -
Assessment of agrochemical residues in wastewater from selected horticultural farms in Arusha, Tanzania
Emmy, Lema; Machunda, Revocatus; Njau, Karoli (International Journal of Environmental Sciences, 2015-09-07)Arusha region in Tanzania has been involved for quite some time on commercial horticulture. The use of agrochemicals results to increased crop productivity and consequently offers farmers major economic returns. However, ... -
Assessment of dairy wastewater treatment and its potential for biogas production at Tanga fresh limited
Nyaki, Anna; Njau, Karoli (Tanzania Journal of Science, 2016-03-16)The extent of pollution of dairy wastewater treated in a septic tank and its potential for biogas production was investigated. Performance of the existing treatment system was assessed through characterization of both raw ... -
Assessment of fluoride removal in a batch electrocoagulation process: A case study in the Mount Meru Enclave
Mureth, Risala; Machunda, Revocatus; Njau, Karoli; Dodoo-Arhin, David (Elsevier B.V., 2021-03-04)The presence of excessive amounts of fluoride than prescribed standards has been reported in various sources of domestic water supply around the slopes of Mount Meru and other parts in Tanzania. Efforts to remove the ... -
Assessment of fluoride removal in a batch electrocoagulation process: A case study in the Mount Meru Enclave.
Mureth, Risala; Machunda, Revocatus; Njau, Karoli; Arhin, David (Elseiver, 2021-03-01)The presence of excessive amounts of fluoride than prescribed standards has been reported in various sources of domestic water supply around the slopes of Mount Meru and other parts in Tanzania. Efforts to remove the ... -
Assessment of water quality variation in rivers through comparative index technique and its reliability for decision making
Kitalika, Aldo; Machunda, Revocatus; Komakech, Hans; Njau, Karoli (Tanzania Journal of Science, 2018)The National Sanitation Foundation (NSF) and Weighed Arithmetic Index (WAI) methods for water quality index (WQI) have been studied to evaluate their reliability in water quality assessment in rivers. Water samples were ... -
Avoiding the Use of Exhausted DrinkingWater Filters: A Filter-Clock Based on Rusting Iron
Ndé-Tchoupé, Arnaud Igor; Lufingo, Mesia; Hu, Rui; Gwenzi, Willis; Ntwampe, Seteno Karabo Obed; Noubactep, Chicgoua; Njau, Karoli (MDPI, 2018-05-02)Efficient but affordable water treatment technologies are currently sought to solve the prevalent shortage of safe drinking water. Adsorption-based technologies are in the front-line of these efforts. Upon proper design, ... -
Characterization of bird, reptile, and insect community diversity in constructed wetlands and waste stabilization ponds across Tanzania
Msaki, Gerubin; Njau, Karoli; Treydte, Anna; Lyimo, Thomas (Elsevier, 2023-11)Wastewater treatment systems, such as Constructed Wetlands (CWs) and Waste Stabilization Ponds (WSPs), have untapped biodiversity enhancement and development potential. Birds, insects, and reptiles, which are displaced by ... -
Cockle (Anadara granosa) shells-based hydroxyapatite and its potential for defluoridation of drinking water
Mtavangu, Stanslaus; Mahene, Wilson; Machunda, Revocatus; Bruggen, Bart; Njau, Karoli (Elsevier, 2022-03-03)The present study describes the synthesis and characterization of a hydroxyapatite (HAp)-based adsorbent derived from biogenic cockle (Anadara granosa) shells for the defluoridation of drinking water. The raw cockle shells ... -
Cockle (Anadara granosa) shells-based hydroxyapatite and its potential for defluoridation of drinking water
Mtavangu, Stanslaus; Mahene, Wilson; Machunda, Revocatus; Bruggen, Bart; Njau, Karoli (Elsevier, 2022-02-27)The present study describes the synthesis and characterization of a hydroxyapatite (HAp)-based adsorbent derived from biogenic cockle (Anadara granosa) shells for the defluoridation of drinking water. The raw cockle shells ... -
Column design for groundwater hardness removal using cashew nut shells activated carbon with potential application in low-income communities
Mwakabole, Emmanuel; Rwiza, Mwemezi; Njau, Karoli (2020-01)tigated. Water hardness has a significant impact on groundwater, especially in arid and semi-arid regions, leading to wasted investments in borehole drilling and worsening accessibility to potable water. In many developing ...