重度生活污水COD_(Cr)催化剂比较研究

[目的]为重度生活污水CODCr值的测定寻找最佳的催化剂。[方法]采用重铬酸钾法,分别将MnSO4、CuSO4及Ag2SO4.MgSO4、KAl(SO4)2、CuSO4.KAl(SO4)2.(NH4)2MoO4、Ag2SO4.Al2(SO4)3.MgSO4作催化剂,对重度生活污水中CODCr进行测定,并与Ag2SO4进行比较。[结果]采用重铬酸钾法测定重度生活污水CODCr时,MnSO4、CuSO4、Ag2SO4.MgSO4(0.02 mol/L)、KAl(SO4)2、Cu-SO4.KAl(SO4)2.(NH4)2MoO4、Ag2SO4.Al2(SO4)3.MgSO4都具有较好的催化效果,其中Ag2SO4.Al(SO4)3.MgSO4的催化效果最好。Ag2SO4.Al(SO4)3.MgSO4和Al2(SO4)3作催化剂时,测得CODCr平均值分别为229.32、254.28 mg/L,前者占后者的90.18%,因此Ag2SO4的测定结果能更好地反映重度生活污水的CODCr值。[结论]Ag2SO4为重铬酸钾法测定重度生活污水CODCr值的最佳催化剂。

Comparison of Catalysts Used to Determine CODCr of Severe Domestic Sewage

[Objective] The study aimed to find the best catalyst for the determination of CODCr of severe domestic sewage.[Method] Adopting potassium dichromate reflux method,respectively using MnSO4,Ag2SO4·MgSO4,CuSO4,KAl(SO4)2,CuSO4·KAl(SO4)2·(NH4)2MoO4 and Ag2SO4·Al2(SO4)3·MgSO4 as catalysts,we determined CODCr of severe domestic sewage,and compared their results with Ag2SO4.[Result] Used as catalysts in the determination of CODCr of severe domestic sewage,MnSO4,Ag2SO4·MgSO4,CuSO4,KAl(SO4)2,CuSO4·KAl(SO4)2·(NH4)2MoO4 and Ag2SO4·Al2(SO4)3·MgSO4 had good catalytic effects,especially Ag2SO4·Al2(SO4)3·MgSO4.Average CODCr of Ag2SO4·Al2(SO4)3·MgSO4 and Ag2SO4 was 229.32 and 254.28 mg/L separately,that is,the former accounted for 90.18% of the latter,so the result of Ag2SO4 could reflect the actual CODCr of severe domestic sewage better.[Conclusion] Ag2SO4 is the optimal catalyst for the determination of CODCr of severe domestic sewage.