Degradation of Arsenic in Wastewater of Wet-process Phosphoric Acid
HUANG Di
LUO Wenming
HUANG Yinping
Abstract：Physical absorption, photocatalysis and chemical flocculation methods were used to investigate the degradation of arsenic ( about 13.56 mg/L) in wastewater of wet-process phosphoric acid from a Chemical Co., Ltd in Yichang, China.The results showed that the absorption capacity of activated carbon was 1g/50mL and 84.4%arsenic could be absorbed efficiently,while the clay could not reach the saturat-ed adsorption in the physical absorption.As3+was oxidized to lower poisonous As5+by Fenton reagent and the removal rate reached 82.2%at the optimum parameter [ H2 O2 ] ∶[ Fe3+]=200 ∶1 using the photoca-talysis method.As to the method of chemical flocculation, the optimum conditions of flocculant-96, floc-culant-98, flocculant-diatomite were as follows: the optimum pH was 12.6, 12.6, 11.8, the optimum quantity of flocculant was 10,9,13 mg/mL and the removal rate of As3+was 65.7%,73.2%,76.3%,re-spectively.At last, an experimental device was designed to degradate arsenic in wastewater from Wet-process phosphoric acid and the concentration of As3+in the treated wastewater could meet the state stand-ard for discharging of industry wastewater.
Keywords：As-containing wastewaterdegradationadsorptionphoto-fentonchemical flocculation
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 289-293 )