In recent decades, industrial progress has brought in material prosperity and comfortable living at a pace unparalleled in the growth of human civilization. But the same pace of industrial growth had led to ecological imbalances, severe pollution of water, land and air. Nature has got its own prevention and control mechanisms to save itself from deterioration and extinction. Nevertheless, our ecosystem has been significantly contaminated by discharging untreated solid, liquid and gaseous effluents having different characteristics, that cause have serious health hazards. Also, environmental...