Microbiological Study on Supply Water and Treated Water in Dhaka City

Abstract

Water borne diseases are the major cause of morbidity and mortality in developing countries like Bangladesh, where disease outbreaks occur due to unsafe drinking water, inadequate sanitation and poor hygienic practices. The objective of this study was to evaluate the quality of water used for drinking as well as household purposes in Dhaka city, Bangladesh. Eighteen water samples were collected from different rivers and canals. Among those, two samples were treated with chlorine. Physico-chemical parameters (pH, salinity, turbidity, conductivity and dissolved oxygen) were monitored during the time of sample collection using portable meters. For microbiological analysis, water samples were collected in sterile screw capped bottle. All Experiments were carried out within 24 hours after collecting the samples. All the water sources were found to be contaminated with total coliform, faecal coliform, Escherichia coli, Klebsiella spp., Salmonella spp., Shigella spp., Vibrio cholerae, Aeromonas spp. and Fungi except treated water samples. Several biochemical tests were performed for confirmation of suspected organisms. According to these results, huge amount of total coliform and faecal coliform were observed in every sample and these amount were very much similar for other organisms. Treated water samples were found to be microbiologically accepted than untreated water samples.

Microbiome patterns reveal the transmission of pathogenic bacteria in hilsa fish (Tenualosa ilisha) marketed for human consumption in Bangladesh

“…In Dhaka, water from rivers and households is reported to have an abundance of coliforms and pathogenic bacteria such as V. cholerae, E. coli, K. pneumoniae and Aeromonas spp. (Acharjee et al 2011;Islam et al 2017). Among these bacteria, V. cholera is the most abundant and widely detected (>25%) in various types of water sources (Rafique et al 2016;Rashid et al 2017).…”

Qualitative analysis of drinking water through the most probable number (MPN) method

“…Such diseases are more common in developing countries like Bangladesh due to poor quality of drinking water (1,2,8,17). Thorough checking of drinking water quality even after application of some treatment such as boiling, filtration etc.…”

“…Dhaka, the capital of Bangladesh, is a over populated city having more than 2.5 million people with the increasing rate of about 5% each year (3). However, events of microbial contamination are frequent along this city resulting in various categories of enteric diseases heading from the consumption of water supplied by Dhaka Water Supply Authority (DWASA) without appropriate purification or processing (1,2,(4)(5)(6)(7)(8).…”

Food safety in Bangladesh: A microbiological perspective

“…As reported by a number of researches, foods are usually contaminated with microorganisms during the stages of harvesting, processing, storage, shipping, food preparation, kitchen utensils including the cutting boards or other surfaces, cross-contamination, etc. (18,(22)(23)(24)(25).…”

“…Besides, the National Taskforce on Food Adulteration (NTFS) made by the GoB found that adulterated foodstuffs each year causes various food borne enteric illnesses, malnutrition and other diseases leading to morbidity and mortality especially to the children (26,36). Indeed, microbiologically contaminated water used for food processing as well as generated from the defective water distribution system is often responsible in conveying the enteric diseases within communities (25,34 and the Norwalk and hepatitis A viruses. Minute amounts of contamination with some of these organisms can result in food borne illness leading to the dreadful impact on the mass public health (Figure 2).…”