Sinor Ali

Sinor Ali

University of New Hampshire

Civil Engineering


Mentor: Dr. M. Robin Collins, UNH Department of Civil Engineering

The Presence or Absence of Coli-form/E-coli in the Waters of Accra, Ghana and the Surrounding Cities

Today’s water crisis is not an issue of scarcity, but of access to safe, usable sources. Every day, lack of access to clean water and sanitation kills thousands and leaves others with reduced quality of life; about twelve million people worldwide die each year from lack of safe drinking water, including three million from waterborne diseases (WHO, 2010). Escherichia coli (E-coli) are an emerging cause of waterborne illness. E-coli are types of fecal coli-form commonly found in the intestines of animals and humans. Coli-form is bacteria associated with human or animal waste. The presence of E-coli in water is an indication of water contaminates.

This study seeks to determine the presence or absence of E-coli and coli-form using the IDEXX Colilert E-coli and coli-form test. Water samples will be collected from the main water sources of Accra, Ghana in West Africa, to include water treatment facilities and taps and storage wells in residential and commercial areas. The goal of this project is to identify if contaminates exist in the city’s water system and if so, if contamination occurs at the main sources of the drinking water or at some other point through the pipes that transports the water.



Mentor: Dr. M. Robin Collins, UNH Department of Civil Engineering

Safe and Clean Water through Intermittent Slow Sand Filtration using BioSand Filters

More than a billion people in the developing world lack access to a safe and reliable source of drinking water. The BioSand filter is a household water treatment technology that allows people to improve the quality of their water by treating it in their homes. This is a household scale, intermittently operated slow sand filter (ISSF). BioSand filters that are challenged with Escherichia coli (E. coli) have demonstrated good average removal levels of 94-99% (WHO, 2000). However, the lowest removals were observed when the void volume exceeded the design of the ISSF. The overall removals of the ISSF are typically lower than observed in conventional slow sand filtration (SSF). Further study is needed to determine design and operational factors contributing to microbial reductions in BioSand filters.



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