1. Afzal M, Shabir G, Iqbal S, Mustafa T, Khan QM, Khalid ZM (2014) Assessment of heavy metal contamination in soil and groundwater at leather industrial area of Kasur, Pakistan. Clean: Soil, Air, Water 42(8):1133–1139
2. Ahmed AU, Reazuddin M (2000) Industrial pollution of water systems in Bangladesh. Environmental system of surface water systems of Bangladesh, University Press Limited, Dhaka, pp 175–178
3. Ahmed I, Habib M, Habib U, Hai A, Khan AU (2016) Analysis and treatment of tannery waste water by using combined filtration and coagulation treatment process. Proc Pak Acad Sci B Life Environ Sci 53(3):179–183
4. Akan JC, Moses EA, Ogugbuaja VO, Abah J (2007) Assessment of tannery industrial effluents from Kano metropolis, Kano State, Nigeria. J Appl Sci 7(19):2788–2793
5. Akan JC, Abdulrahman FI, Ayodele JT, Ogugbuaja VO (2009) Impact of tannery and textile effluent on the chemical characteristics of Challawa River, Kano State, Nigeria. Elect J Environ Agric Food Chem 8(10):1008–1032