Waste Water Treatment

Introduction
Waste water from thermal power plants includes waste water from water purifiers, waste water from fuel oil pump rooms which is likely to contain oil, water from flue gas desulfurizing facility, domestic waste water from kitchen and sanitation. The major ingredients of such waste water range from acidic and alkaline substances to suspended solids, oil, and soluble iron. It is very rare that waste water contains harmful substances.


Waste Water Treatment System in Thermal Power Plants
In thermal power plants, waste water from all equipment is collected at one place and subjected to treatment by high-performance oil separator and coagulating sedimentation. Waste water treatment system in thermal power plants is thus integrated.




When waste water is known to contain oil, it is sent to high performance oil separators such as the PPI (Parallel Plate Interceptor) and CPI (Corrugated Plate; Interceptor). With oil separated there, water is subsequently passed through a number of filters, consisting of sand, oil adsorbent and active carbon, so as to separate trace amounts of oil, suspended solids, and so on.

Waste water from water purifier and waste water from flue gas desulfurizing facility are temporarily held in storage tanks. These are treated in a neutralizing system, coagulating and sedimentation system to neutralize acids and alkali, and to remove suspended solids and soluble iron.

Domestic waste water is treated based on the activated sludge process.