Academic journal article American Academic & Scholarly Research Journal

Effective Use of Rice Husk Ash to Treat Highly Polluted Water: Case Study in the Dhalassori River, Bangladesh

Academic journal article American Academic & Scholarly Research Journal

Effective Use of Rice Husk Ash to Treat Highly Polluted Water: Case Study in the Dhalassori River, Bangladesh

Article excerpt

Abstract. In Dhaka city the source of surface waters as like as Dhalassori, Sitalakha, Buriganga rivers are frequently deteriorating due to the discharging of heavily toxic wastes into the water by the various industries and factories. The major source of drinking water is the underground which is rapidly decreasing due to the frequent use. If quality of surface water like Dhalassori river is such that it is too difficult to treat the water for the drinking purpose then a catastrophe may happen one time because the people who are wasting this valuable source of water may not know that how much days they can survive without potable water. In this research it is successfully shown by through laboratory and statistical analysis that a bio adsorbent called Rice Husk Ash obtained from the burning of Rice husk has the COD removal efficiency 99.33 .3% ~ 99.99% and color removal efficiency of 99.96% with respect to the raw water of Dhalassori river if the factors influencing adsorption that is investigated for the Rice Husk Ash, can be properly maintained.

Keywords: Wastes, Waste water. River, Pollution, Economical, Biosorbents, Bacteria, Rice husk ash, Biomass

1. INTRODUCTION

The River Dhalassori is the life line of the Dhaka city and flanked in its southern side. Unlike many other rivers in the world, the Dhalassori River is not only important for providing vital ecological function, but also for various other purposes such as drinking water supply, transportation, cleaning, washing, recreation, ground water recharge, flood control and also as a means of disposing wastes within the assimilation capacity of the river. The Dhalassori River receives wastewater and storm water along its course through many point sources such as sluice gates, city drains and effluent outfall of the Pagla Sewage Treatment Plant (PSTP). The study by Kamal (1996) and Magumdar (2005) have identified this particular sluice gate to be the most susceptible to discharge highly polluted wastewater from tanneries in Hazaribagh area along with municipal wastewater from the neighbouring areas of Katasur and Ramchandrapur klial.

These are mostly located within very densely populated areas near the river like Islambagh, Shahidnagar and Kamrangir Char. Because of this scattered and unpredictable drainage pattern, the Dhalassori River basin has been subdivided into a number of wastewater and storm water drainage zones by previous studies in order to compute wastewater flow rates and pollution loadings (JICA 1991; Browder 1992; Kamal 1996; Rahman and Rana 1996).

The major drainage channels (locally known as Klial) in the City are Dholai klial, Gerani khal, Segunbagicha klial and Begunbari klial, which collect catchment's runoff as well as wastewater and drain to the peripheral rivers. According to a recent estimate, about 70,000 tons of raw hides and skins are processed in these tanneries every year polluting the environment and the quantity of untanned solid wastes namely raw trimming, we lime fleshing, pelt trimming generated in these tanneries is estimated to be 28,000 tons. Statistics provided by various sources suggest that a big tannery of the Hazaribagh area releases 2,500 gallons of chemicals wastes each day, polluting the city's air in addition to contaminating the water of the river Dhalassori. (Ahmad et al.. 2009)

Therefore, for the necessity of time and to save our future generation from a certain catastrophe, finding a highly sustainable treatment option for the Dhalassori river waste water is obvious. The technology used in this research is bio adsorption and the bio adsorbent used for the treatment is rice husk ash. An integrated approach has been taken in this study to characterize and to evaluate the efficiency of rice husk ash and to give the most cost effective solution for the treatment of Dhalassori river waste water. Treatment of Dhalassori river waste water by RHA under several treatment processes. To select the most effective treatment processes for the treatment of Dhalassori river waste water which is highly sustainable and economical in the context of Bangladesh. …

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