Experiment Study On The Treatment Of Sb-containing Wastewater By Activated Carbon With Assistance Of Ultrasonic And Flocculation By Fe₂（SO₄）₃

In recent years, along with the sustained and rapid development of China’s economy and technology, heavy metal pollution has become a hot and difficult problem in the field of environment, and the discharge of heavy metal wastewater has posed a serious theat to our living environment and human health. Heavy metal pollution could gradually become severer and severer with the accumulation of heavy metal ions since heavy metal contamination could not be degraded in natural environment. Therefore, the method research of disposing the heavy metal waste water becomes a heated research aspect at present. Anti-mony and its compounds are widely used in various manufacturing and semic-onducting industries. It presents in the environment as a result of natural process and human activities. The contamination of antimony in the environment is increasingly severe. In recent years, interest in the relative research has grown in abroad. Antimony and its compounds are included in the U.S.EPA priority pollutants, while also being included in the Basel Convention on hazardous w-astes EU, it is also closely pollutants Environment Agency of Japan. In the present study using ultrasound-assisted activated carbon and iron sulfate-methods such as flocculation and sedimentation method for removing heavy metals antimony were studied and investigated the effect of ultrasonic temperature and d-uration, adsorption temperature and duration, pH and dosage of activated carbo-n on the treatment of Sbcontaining wastewater anddiscusses various methods of antimony removal mechanism. Experimental results show that:(1)Ultrasound-assisted adsorption onto the activated carbon Can quickly and effectively remove the Sb from wastewater, the removal efficiency of Sb was gre-ater than the sum of those in sole activated carbon and ultrasound alone. The key factors for the Sb removal are ultrasonic temperature and duration, adsorp-tion temperature and duration, pH and dosage of activated carbon. The content of Sb was measured with flame atomic absorption spectrometry and direct analysis on the measurement was carried. The result shows,when temperature was40℃, lasted20min, adsorption last60min, pH=2, the ratio of active carbon and antimony is1mg Sb/g the removal rate of Sb could be higher than95.86%.(2)The treatment process of sulfate to removal Sb was affected by the solution initial pH, wastewater initial concentration, precipitation temperature and other factors. When the pH=10.0, the best sulfate removal rate is93.33%. Sum up, alkaline conditions more conducive to removal Sb. With the extension of prec-ipitation time, the concentration of Sb on the wastewater was reduce, continued to180min, the Sb in wastewater has been basically complete serrlement by the removal rate could be higher than97.48%.The precipitation is also affected by temperature, when control temperature reaches35℃, precipitation are best.