Water Management and Pollution Control in Steel Plant Sep04

Water Management and Pollution Control in Steel Plant...

Water Management and Pollution Control in Steel Plant An integrated steel plant incorporates a number of processes right from raw material preparation to rolling of finish steel. All these processes need water. When the water is used in these processes it gets contaminated with pollutants in various amounts and concentrations. Typical requirement of water in various processes in steel plant needs 100 to 200 Cum per ton of steel. Pumping capacities for this amount of water is needed in the steel plant. The requirement of makeup water depends on the water treatment and recirculation facilities in the plant and usually is in the range of 2 to 4 Cum per ton of steel. Water management in an integrated steel plant is very important for its successful operation since the integrated steel plant needs a large amount of water for its operation. During the operation of the plant this water gets polluted. It is very difficult to separate water pollution control from water management in the plant. A good water management leads to a decrease in pollution control of water while at the same time pollution control of water needs good water management.  Good water management requires zero or minimum water discharge from the plant. This is achieved by incorporating elaborate water treatment systems for recirculation of water. This reduces water consumption since there is a reduction in the requirement of makeup water. It also reduces the water pollution since the water discharge from the plant boundary becomes nil or negligible.  Further it reduces the necessity and cost of treatment of polluted water before its discharge from the plant boundary. Use of water Water has many varied uses in the iron and steel plant and the quality of water needed for each use also vary....