NO_x, SO₂ 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 × 10⁴-150 × 10⁴ 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, SO₂ and HCl emissions at 800-950°C. Experiments show that NO_x mainly comes from the oxidation of organic-amine and decomposition of minim HNO₃, and the maximum NO_x emission reaches about 130 mg/m³. It is found NO_x, emission at 950°C is lower than that at 900°C, because at 950°C the amine-compounds, such as aniline and methyl aniline in waste liquid, have stronger reducing effect on NO_x than that at 900°C. SO₂ from the oxidation of organic-sulfur and decomposition of minim H₂SO₄, which decreases very rapidly with the increase of oxygen concentration in flue gas. SO₂ 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°C, This result is probably related to the decomposition of H₂SO₂. HCl emission is mainly from organic-chlorine, and it is almost the same at 800-950°C, indicating organic-chlorine is almost totally converted to HCl.