| dc.description.abstract | Untreated greywater which negatively impacts our environment are directly discharged. This
greywater have a huge potential in terms of treatment and reuse unlike the traditional
wastewater which needs large-scale centralized treatment plants to be built with huge
infrastructural costs. Therefore this paper studies the primary quality of greywater present in
Chattogram city by conducting an environmental assessment of the greywater. 10 greywater
samples were collected for chemical analysis and 5 for microbial examination from 5
different locations in Chattogram City. Water parameters like pH, Total Dissolved solids
(TDS), Electric conductivity (EC), Total hardness, Dissolved Oxygen (DO), Oxidation–
Reduction potential and other chemical analysis such as fluoride, chloride, phosphates,
Sulphate, and nitrate levels were tested. Also, MPN tests were done on the greywater samples
to find the total coliforms and fecal coliforms CFU/100 ml after which the coliforms were
cultured on EMB to see the patterns of the colonies present. Parameters like Electrical
Conductivity, pH, Dissolved Oxygen, Total hardness, Fluoride, Nitrates and sulphates were
found to be suitable for wastewater reuse in irrigation without almost any improvement as
they maintained international standards. On the other hand, the turbidity for the samples
ranged from 21.0 NTU to 239 NTU which was higher than the standard turbidity level of 2
NTU which affects soil texture, reduces hydraulic conductivity of the soil and contaminates
soil surface. Also, fecal coliforms were present in all samples and were less than 10000
CFU/100 ml which is why this greywater could be used for unrestricted irrigation without
treatment. However, it was deducted that the water needed to be treated for biological
impurities because the total coliform counts were more than 1100 CFU/ 100 ml for all the
samples which could result in diseases and infections. Moreover, the Chloride level in the
water was found to be high ranging from 5.07 mg/L to 100.7 mg/L which needs to be treated
because high levels of Chloride in Irrigation could cause leaf burns and damages in plant
tissues. The paper further reviews low-cost treatment systems from Kenya, India and Egypt
which could be used in a developing country like Bangladesh for the treatment for use in
irrigation purposes. Moreover, this paper gives recommendations on how the situation of
greywater can be improved by looking into proper management aspects. | en_US |
