NO_x,SO_2 and HCl Emissions of Organic Waste Liquid from Chemistry Laboratory Incinerated in Fluidized Bed

Waste liquid discharged from organic chemistry laboratory has lots of toxic substances, including organic-nitrogen, sulfur and chlorine compounds. Chemical oxygen demand(COD) values are in the range of 30×10~4~150×10~4 mg/L. Incineration is adopted to treating it in a fluidized bed of 2 m in height and 120 mm in diameter, to investigate NO_x, SO_2 and HCl emissions at 800~950 ℃. Experiments show that NO_x mainly comes from the oxidation of organic-amine and decomposition of minim HNO_3, and the maximum NO_x emission reaches about 130 mg/m~3. It is found NO_x emission at 950 ℃ is lower than that at 900 ℃, because at 950 ℃ the amine-compounds, such as aniline and methyl aniline in waste liquid, have stronger reducing effect on NO_x than at 900 ℃. SO_2 from the oxidation of organic-sulfur and decomposition of minim H_2SO_4, which decreases very rapidly with the increasing of oxygen concentration in flue gas. SO_2 emission reaches the maximum at zero percent of oxygen, when it increases very rapidly with the increase of temperature at low oxygen concentration at 800~950 ℃, This result is probably related to the decomposition of H_2SO_4. HCl emission is mainly from organic-chlorine, and it is almost the same at 800~950 ℃, indicating organic-chlorine is almost totally converted to HCl.