%0 Journal Article
%T Pretreatment of heterocyclic pesticide wastewater using ultrasonic/ozone combined process<br>
%A Xiong Zhenglong
%A Cheng Xiang
%A Sun Dezhi
%A <br>
%J 环境科学学报(英文版)
%D 2011
%I 
%X Ultrasonic/O3 combined process was employed to pretreat heterocyclic pesticide wastewater for increasing biodegradability and reducing biological toxicity. Influences of ultrasonic frequency, ultrasonic power, probe diameter, initial pH and O3 dosage on the COD removal were studied. The results showed that the ultrasonic/O3 process significantly improved the biodegradability and reduced the biological toxicity of the wastewater. The ratio of BOD5/COD was increased from 0.03 to 0.55 and the EC50 increased from 11% to 52% under ultrasonic/O3 treatment. Low ultrasonic frequency brought better COD removal. Initial pH was found to have a high influence on the COD removal and alkaline conditions were more favorable. The influences of ultrasonic power and probe diameter were small. With an increase in O3 dosage, COD removal was e ectively improved. The optimal operational parameters for the combined process on COD removal were ultrasonic frequency 20 kHz, initial pH 9.00, ultrasonic power 300Wand dosage of O3 454.8 mg/(L min), under which the e ciency of COD removal reached 67.2%.
%K heterocyclic pesticide wastewater
%K ultrasonic
%K O3
%K BOD5/COD
%K biological toxicity<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=6CB1530875F53489BF1E81BD87B7F5E6&aid=95C11EC624441CDB29E18E83711EB876&yid=9377ED8094509821&vid=EA389574707BDED3&iid=94C357A881DFC066&sid=00B9006659EBD8AC&eid=245EE63BFE8F8B66&journal_id=1001-0742&journal_name=Journalofenvironmentalsciences(China)&referenced_num=0&reference_num=34