Browsing Research Articles [MEWES] by Author "Njau, Karoli"
Now showing items 41-60 of 116
-
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 ... -
Fabrication of porous carbon nanofiber webs from polyacrylonitrile and cellulose acetate for NaCl removal from water using capacitive deionization
Tarus, Bethwel; Jande, Yusufu; Njau, Karoli (IWA Publishing, 2024-01-01)Capacitive deionization (CDI) has shown potential in addressing freshwater scarcity. CDI's electrode design is a key to better performance as it determines the extent of water purification. For carbon electrodes, the pore ... -
Factors influencing solid waste generation and composition in urban areas of Tanzania: The case of Dar-es -Salaam
Senzige, Jonas Petro; Makinde, Daniel Oluwole; Njau, Karoli; Nkansah-Gyeke, Yaw (Science Publishing Group, 2014-07-30)Solid waste characterisation study was carried in Dar-es-Salaam to quantify the waste generation rates and composition. By studying solid waste generation trends for three socioeconomic statuses, it was found that the ... -
Fe0-Supported Anaerobic Digestion for Organics and Nutrients Removal from Domestic Sewage
Bakari, Omari; Njau, Karoli; Noubactep, Chicgoua (MDPI, 2022-08-15)esults from different research suggest that metallic iron (Fe0) materials enhance anaerobic digestion (AD) systems to remove organics (chemical oxygen demand (COD)), phosphorus and nitrogen from polluted water. However, ... -
Fluoride Variations in Rivers on the Slopes of Mount Meru in Tanzania
Kitalika, Aldo; Machunda, Revocatus; Komakech, Hans; Njau, Karoli (Hindawi, 2018-01-23)This study reports the variations of fluoride ions in rivers on the slopes of Mount Meru in the northern part of Tanzania. More than 318 water samples were collected from Temi, Nduruma, Tengeru, andMaji ya Chai Rivers in ... -
Fluoride Variations in Rivers on the Slopes of Mount Meru in Tanzania
Kitalika, Aldo; Machunda, Revocatus; Komakech, Hans; Njau, Karoli (Hindawi, 2018-01-23)This study reports the variations of fluoride ions in rivers on the slopes of Mount Meru in the northern part of Tanzania. More than 318 water samples were collected from Temi, Nduruma, Tengeru, and Maji ya Chai Rivers in ... -
Heavy metals risk assessment of water and sediments collected from selected river tributaries of the Mara River in Tanzania
Nkinda, Mihayo; Rwiza, Mwemezi; Ijumba, Jasper; Njau, Karoli (Springer Nature, 2021-06-25)This study investigated the levels of Pb, Hg, Cr, Cd, and As in water and sediments from the tributaries of the Mara River, Tanzania. Pollution risk of water and sediments was investigated using seven indices and fve ... -
Hydrogeochemical characteristics and spatial distribution of groundwater quality in Arusha well fields, Northern Tanzania
Chacha, Nyamboge; Njau, Karoli; Lugomela, George; Muzuka, Alfred (Springer, 2018-07-09)Arusha aquifers have been exploited intensively serving as the main source of domestic water supply in the city. But the quality of groundwater is not clearly documented for future planning and management. Hydrogeochemical ... -
Improving biological treatment of textile wastewater
Laizer, Alpha; Bidu, Jerome; Selemani, Juma; Njau, Karoli (IWA Publishing, 2022-01-01)Textile industries are among the primary contributors of water pollution. Treatment of textile wastewater is very important before discharging it to the environment. In the present study, laboratory-scale anaerobic batch ... -
In situ facile green synthesis of Ag–ZnO nanocomposites using Tetradenia riperia leaf extract and its antimicrobial efficacy on water disinfection
Mtavangu, Stanslaus; Machunda, Revocatus; Bruggen, Bart; Njau, Karoli (Springer Nature Limited, 2022-09-13)In this work, Ag–ZnO nanocomposites were prepared by a green synthesis route using aqueous leaf extract of Tetradenia riperia and investigated for antibacterial activity against Escherichia coli and Staphylococcus aureus. ... -
Influence of farmers’ socio-economic characteristics on nutrient flow and implications for system sustainability in smallholdings: a review
Mhoro, Lydia; Meya, Akida; Amuri, Nyambilila; Ndakidemi, Patrick; Mtei, Kelvin; Njau, Karoli (Frontiers in Soil Science, 2023-04-14)The rise in global human population, coupled with the effects of climate change, has increased the demand for arable land. Soil fertility has been the most affected, among other things. Many approaches to soil fertility ... -
Influence of Macrophyte Types towards Agrochemical Phytoremediation in a Tropical Environment
Lema, Emmy; Machunda, Revocatus; Njau, Karoli (International Journal of Engineering Research and General Science, 2014-09)The presence of agrochemicals waste water from agricultural fields poses major environmental and human health problems which may be solved by phytoremediation technologies. Phytoremediation is the use of plants to remediate ... -
Influence of scoria and pumice on key performance indicators of Portland cement concrete
Mboya, Hieronimi; Njau, Karoli; Mrema, Alex; King'ondu, Cecil (Elsevier Ltd, 2019-02-10)Cement industries have a huge CO2 signature that can be reduced in an effort to mitigate climate change via precise cement substitution with supplementary cementing materials (SCMs). The substituting materials and their ... -
The influence of stereochemistry of the active compounds on fluoride adsorption efficiency of the plant biomass
Mwakabona, Hezron; Machunda, Revocatus; Njau, Karoli (Science Publishing Group, 2014-08-20)Several studies have reported various defluoridation capabilities of plant biomasses. The resultant variations in fluoride removal capacities are associated with the presence of different types of active functional groups ... -
Integrated constructed wetlands treating industrial wastewater from seed production
Kiflay, Elizabeth; Selemani, Juma; Njau, Karoli (IWA Publishing, 2021)The performance of an integrated wastewater treatment system composed of horizontal subsurface flow constructed wetland (HSSFCW), floating constructed wetland (FCW), and anaerobic baffled reactor (ABR) was studied for ... -
Integrated Process for Sustainable Agro-process Waste Treatment and Climate Change Mitigation in Eastern Africa
Njau, Karoli; Kyambadde, Joseph; Dawit, Mekibib David; Hermogène, Nsengimana (International Livestock Research Institute (ILRI), 2011-11)Eastern Africa countries are faced with similar development challenges including high population growth rate, low agricultural productivity, increasing number of agro-processing industries, pollution and contamination ... -
Kinetic analysis of anaerobic sequencing batch reactor for the treatment of tannery wastewater
Mekonnen, Andualem; Leta, Seyoum; Njau, Karoli (Academic Journals, 2017-06-30)A pilot scale anaerobic sequencing batch reactor (ASBR) was operated at different organic loading rate (1.03, 1.23, 1.52 and 2.21 kg.m-3.d-1) in order to determine the chemical oxygen demand (COD) removal and methane ... -
Land-Use and Land Cover Changes on the Slopes of Mount Meru-Tanzania
Kitalika, Aldo; Machunda, Revocatus; Komakech, Hans; Njau, Karoli (Current World Environment, 2018-12)Environmental transitions analysis was done in part of the land on the slopes of the foothills of Mount Meru in thirty (30) years’ time from 1986 to 2016 using satellite-derived land use/cover maps and a Cellular Automata ... -
Life cycle analysis of potential municipal solid wastes management scenarios in Tanzania: the case of Arusha City
Richard, Edwin; Hilonga, Askwar; Machunda, Revocatus; Njau, Karoli (Springer Nature, 2021-01-07)The municipal solid wastes (MSW) management technologies in most cities of developing countries pose a continuous risk of contaminating the environment and affecting human health adversely; often because MSW technologies ... -
Low-cost far-field wireless electrical load monitoring system applied in an off-grid rural area of Tanzania
Wang, Xinlin; Ha, Bora; Lee, Gil-Yong; Kim, Hyungjung; Yu, Jongha; Rhee, Herb; Njau, Karoli; Jande, Yusufu; Ahn, Sung-Hoon (Elsevier Ltd., 2020-08)Despite the rapid development of Internet of Things (IoT) technology, there is still a lack of practical wireless energy monitoring methods that can be implemented directly in rural areas with undeveloped infrastructure. ...