摘要:
为考察基于紫外（UV）、臭氧（O3）氧化处理工艺对苯乙烯和COD的去除效果,以甲醇制烯烃（MTO）装置废水中的苯乙烯为研究对象,分析了初始pH、臭氧投加量、苯乙烯初始浓度以及Al2O3-Mn、Al2O3-Ti对臭氧氧化苯乙烯去除效果的影响。试验结果表明:在pH=9、臭氧投加量为9 mg/min、苯乙烯初始质量浓度为30 mg/L,单独臭氧氧化降解苯乙烯效果最好,反应60 min后苯乙烯和COD的去除率分别为96.5%和48.1%,Al2O3-Mn催化剂催化作用下,臭氧催化氧化苯乙烯废水效果优于单独臭氧,45 min后苯乙烯去除率为99.4%,60 min后苯乙烯去除率达到100%,COD去除率为55.4%。初始pH、苯乙烯初始浓度、过硫酸钠对紫外降解苯乙烯、COD效果的影响试验结果表明:单独紫外在pH=3、苯乙烯初始质量浓度为35 mg/L时去除苯乙烯效果最好,反应120 min去除率达到94%,COD去除率为28%;紫外+过硫酸钠氧化效果优于单独紫外,在pH=7、苯乙烯初始质量浓度为35 mg/L时,反应90 min苯乙烯去除率为99.4%,反应120 min去除率达到100%,COD去除率为30%。臭氧催化氧化工艺较其他3种处理工艺对煤化工废水中苯乙烯的去除具有一定优势。
Abstract:
Taking styrene in coal to olefin MTO process wastewater as the research object，the removal effects of styrene and COD using ultra- violet( UV) and ozone ( O 3 ) oxidation treatment process were studied．The effects of pH，ozone dosage，styrene initial concentration，Al 2 O 3 － Mn and Al 2 O 3 －Ti on ozone oxidation of styrene were carried out．The experimental results showed that under the optimal conditions as pH = 9， ozone dosage 9 mg / min，styrene initial concentration 30 mg / L，reaction time 60 min，the removal rates of styrene and COD oxidation by ozone were 96．5% and 48．1% respectively．With the catalysis of Al 2 O 3 －Mn catalyst，styrene removal rate of ozone catalyzed oxidation for styrene wastewater was better than ozone only，which reached 99．4% after 45 min，the styrene removal rate could be high to 100% after 60 min，mean- while，the COD removal rate was 55．4%．The effects of initial pH，styrene initial concentration，sodium persulfate on UV degradation of styrene and COD were studied．The experimental results showed that under the condition as pH = 3，styrene initial concentration 35 mg / L，the removal rate of the styrene and COD removal rate were 94% and 28% after 120 min respectively treated by UV．With the same conditions，the effect of UV+sodium persulfate was better，as pH = 7 and styrene initial concentration 35 mg / L，the styrene removal rate was 99．4% after 90 min，it could be up to 100% after 120 min，meanwhile，the COD removal rate was 30%．Compared with the other three treatment processes，ozone cat- alyzed oxidation process had some advantages on treatment of styrene from coal chemical wastewater．
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