Rajabu Hamisi

KTH Royal Institute of Technology | KTH · Department of Sustainable Development, Environmental Science and Engineering (SEED)

Fluoride is essential for the human body and a global groundwater contaminant (the recommended WHO limit is 1.5 mg/L). The mobilization and genesis of fluoride depend on fluoride-bearing rocks (e.g., fluorite, fluor-apatite, biotite, etc.) that are a part of the natural geogenic process, which later contaminate the groundwater. More specifically, t...

For decades, researchers in many disciplines have neglected the spatial aspects of data collected on geographical phenomena of interest during the analysis stage. This has been due to lack of computational capabilities and limitation in conventional methods. Consequently, insight gained in the data is not optimal. In this study, we present a novel...

Geogenic contamination of drinking water sources in the gold mining areas of Lake Victoria Basin in Tanzania is an emerging health risk of concern. Elevated concentrations of trace elements such as arsenic and mercury, has been associated with the mining activities which impaired the access to safe water for diverse human uses. In this study, we in...

Piezometer nests are used globally for characterising and monitoring various aquifers systems in various areas of groundwater based water supply systems. ASMITAS has been used to increase groundwater safety and hence a better decision making during the new tube well installation in Bangladesh. Integration of IOT based hydrogeological system with AS...

Geogenic contamination of surface and groundwater is frequently associated in regions of gold mining worldwide and related to drinking water quality problems. In Tanzania, elevated levels of trace elements (TEs) have been reported in drinking water sources within the Lake Victoria Basin, posing a serious health risk to communities. The present stud...

Geogenic contamination of surface and groundwater is frequently associated in regions of gold mining worldwide and related to drinking water quality problems. In Tanzania, elevated levels of trace elements (TEs) have been reported in drinking water sources within the Lake Victoria Basin, posing a serious health risk to communities. The present stud...

The sorption capacities of sand filters used for onsite wastewater treatment and their associated risks of phosphorus (P) leaching on contact with rainwater were investigated in column experiments and with modelling tool for over 300 days. Columns packed with sand were exposed to real domestic wastewater of different characteristics and hydraulic l...

The performance of a tidal flow constructed wetland (TFCW) following wastewater treatment in a package plant designed for two households was studied in a nine-month field trial and its design evaluated through process modelling and pumping tests. The TFCW is operated by filling and draining periods lasting five to nine days, depending on wastewater...

This study has investigated the long-term performance, mode of hydraulic failures and sorption capacity of the novel innovation technology for integrated on-site wastewater treatments in Sweden. To provide a far-reaching scientific understanding of the treatment efficiency, adsorption capacity and mode of hydraulic failure in the reactive filter be...

Many on-site wastewater treatment systems, such as soil treatment systems, are not sustainable in terms of purification efficiency, nutrient recycling potential, and economics. In this case study, a sequencing batch constructed wetland (SBCW) was designed and added after a package treatment plant (PTP) using reactive filter media for phosphorus (P)...

Use of reactive filter media (RFM) is an emerging technology in small-scale wastewater treatment to improve phosphorus (P) removal and filter material longevity for making this technology sustainable. In this study, long-term sorption kinetics and the spatial dynamics of sorbed P distribution were simulated in replaceable P-filter bags filled with...

Developing low-cost and effective technologies to upgrade phosphorus (P) removal from the catchment runoffs and rural wastewater treatment facilities is one of the main research agendas to save the Baltic Sea from eutrophication. In Sweden, the construction of the constructed wetlands has been one of the environmental objectives for wastewater qual...

The Lower Rufiji Basin is a complex and ungauged river basin located downstream of the main Rufiji River in the southeast of Tanzania. It supports mixture of indigenous societies by provisioning of fertile floodplains and mangroves rich delta for recession farming, fishing and livestock production. The recurrent droughts and impoundments for servic...