The Causes and Impacts of Water Pollution of Buriganga River

INTERUNIVERSITY PROGRAMME INWATER RESOURCES ENGINEERING

Presented by:Md Moudud Hasan

&Farida Yasmin Ruma

Contents• Introduction• Water Quality of Buriganga River• Causes of Pollution• Impacts of Pollution• Recommendations• Conclusion

Introduction

• The Buriganga river is the main river flowing through Dhaka, the capital of Bangladesh.

• Most of the industries and factories of Dhaka are situated on the banks of the Buriganga.

• The urban sewage of the Dhaka city is thrown in the Buriganga river.

• The average flow of the river - 140 m3/s in dry season (November to May) and 700 m3/s in wet season (June to October).

Introduction

Is Buriganga River Polluted?

One of the most polluted river in the world

Water Quality of Buriganga River

Parameters Bangladesh Standard for

Fisheries (EQS,1997)

Investigated Water Quality (average value)

Wet season Dry season

pH 6.5-8.5 6.6 7.5DO (mg/I) 4.0-6.0 4.9 3.7BOD (mg/I) (-) or below 2 26.4 33.4TDS (mg/l) 500 238 579EC (µs/cm) 800-1000 1685 2250Temperature (°C) 25 27.04 18.2Transparency (cm) 40 24.6 22.8COD (mg/l) 4 188.60 265.33

Causes of pollution • Discharge of industrial effluent• 249 industries along the banks of the river.• no waste water treatment plants of their own. • >60,000 m3/day of toxic waste

Causes of pollution • Discharge of tanneries • 200 leather tanneries in the Hazaribagh area of Dhaka.• The tanneries discharge untreated liquid toxic waste @22,

000 m3/day

Causes of pollution • Disposal of solid & domestic waste• Dhaka WASA’s only one sewage treatment plant with a

capacity of 0.12 Mm3/day (10 % of the total disposal of sewage).

• about 900 m3/day untreated domestic and human waste are discharged into the Buriganga-Turag system.

Causes of pollution • Sedimentation at the upstream• because of the sedimentation on the

upstream, the flow of Buriganga-Turag system gets cut off, especially during the dry season

Causes of pollution • Population explosion• Dhaka's 15 million people live in just 325 km2.

(> Belgium 11.2 million)

Impacts of pollution • It is difficult to survive for aquatic life

Impacts of pollution • Pressure on urban water source

Impacts of pollution • Excessive health hazards

Impacts of pollution • Navigation problem

Recommendations

• Public awareness is the very important gears for pollution control.

Recommendations

• Moving tannery from Hazaribagh• The plots at Savar’s Leather Industrial City allotted to tannery

units.

Recommendations

• Set up new waste water treatment plants.

• Government should force all the industries to installed and use ETPs (Effluent Treatment Plant).

Conclusion • River water quality was poorer in winter season than rainy

season.

• The physiochemical properties such as Temperature, pH and TDS were within the safe limit throughout the year.

• Dissolved Oxygen concentration in winter (January) very low due to various microbial activities--- an unfavorable environment for aquatic lives.

• Buriganga River water quality is not acceptable fromaquatic ecosystem perspectives for the parameters suchas BOD5, COD and EC during both dry and wet seasons.

References 1. Chakraborty, C., M. M. Huq, S. Ahmed, T. Tabassum, and M. R. Miah. 2013. “Analysis of

the Causes and Impacts of Water Pollution of Buriganga River: A Critical Study.” Int J Eng Res Technol 2: 245.

2. “Dhaka.” 2016. Wikipedia, the Free Encyclopedia. https://en.wikipedia.org/w/index.php?title=Dhaka&oldid=720578573.

3. Rahman, Md Ashiqur, and D. A. Bakri. 2010. “A Study on Selected Water Quality Parameters along the River Buriganga, Bangladesh.” Iranica Journal of Energy & Environment 1 (2): 81–92.

4. Saifullah, A. S. M., M. H. Kabir, A. Khatun, S. Roy, and M. S. Sheikh. 2013. “Investigation of Some Water Quality Parameters of the Buriganga River.” Journal of Environmental Science and Natural Resources 5 (2): 47–52.

5. Uddin, Md Galal, Md Moniruzzaman, Muhammad Al-Amin Hoque, Md Abu Hasan, and Mala Khan. 2016. “Seasonal Variation of Physicochemical Properties of Water in the Buriganga River, Bangladesh.” World Applied Sciences Journal 34 (1): 24–34.

THANK YOU FOR YOUR ATTENTION

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