Large amount of sludge

in which containing a variety of heavy metals harmful to the environment

has produced from wastewater treatment of the limestone/gypsum wet flue gas desulphurization (FGD) system.For this

the heavy metal content in intaking water

effluent water

and sludge of wastewater treatment facility in the FGD system of Huaneng Beijing Thermal Power Co Ltd is monitored continuously with microwave digestion-atom absorption spectroscopic method

the variation tendency of heavy metal content in wastewater treatment process of the FGD system in said power plant being grasped

providing basis for studying the decrease of sludge from wastewater of the FGD system.The monitored results show that the FGD wastewater treatment technology adopted in Beijing Thermal Power Plant has removal effects upon heavy metals

such as Hg

As

Cd

Cr

Pb

Ni

Zn

and Cu etc.

the concentration of every heavy metal in effluen water from the treatment system all reaches the controlled index specified in standard DL/T 997—2006

and the first class norm of emission specified in standard GB 8978—1996;excepting the removal efficiency of Pb is somewhat lower (the average value is 25.5%)

the removal efficiency of other seven heavy metals all reaches 70% and more.