Phytoplankton Diversity and Abundance in Relation to Pollution Levels in the Hazaribagh Tannery Effluent Sewage Water of the River Buriganga

Abstract

About 185 leather processing industries have been operating in Hazaribagh and discharging solid and liquid wastes to the downstream areas of the river Buriganga and to the canals around. The physico-chemical parameters and biological examination of tannery effluents sewage water were carried out in relation to phytoplankton abundance at four selected points (viz. Kamrangirchar: K1, K2 and K3; Hazaribagh Tempo Stand: H) of the Buriganga river from October  2009 to September 2010. Altogether 27 genera of Phytoplankton belonging to the families Cyanophyceae, Bacillariophyceae, Chlorophyceae, Euglenophyceae and Cryptophyceae were identified from the above points. Merismopedia was the most abundant form (3.6×10⁴ - 2.4×10⁶ cell/L) compared to those (1.4-72 ×10³ cell/l) genera of other phytoplankton (Nitzschia, Synedra, Pleurosigma, Euglena , Strusastrum, Crucigenia, Ourococcus ) at K1, the station closest to the tannery  effluent outfall. The abundance of Merismopedia increased gradually (K2: 6.45×10⁴ - 3.68×10⁶, K3: 6.95×10⁴ -1.68x10⁷ and H: 1.0×10⁵ - 2.06×10⁷) along with the decreasing pollutant concentrations of the water.

DOI: http://dx.doi.org/10.3329/bjz.v40i1.12901

Bangladesh J. Zool. 40(1): 121-128, 2012