Fe2+-H2O2法处理DSD酸生产氧化母液的研究

为改善DSD酸氧化母液的可生化降解性,将废液先用有机絮凝剂TS-1(一种季胺盐)处理,TS-1的投加量为3g/L,其后用Fe²⁺-H₂O₂法氧化,Fe²⁺和H₂O₂的量分别为150mg/L,7g/L,废液COD和色度的去除率分别可达64%和62%。经处理后的废水,其BOD₅/COD≈0.3,可以认为已达到生化处理的要求。当H₂O₂的投量为2g/L,经Fe²⁺-H₂O₂氧化处理后的废液,再用FeCl₃进行两级混凝处理(FeCl₃的投加量分别为5g/L和2g/L),则COD和色度的去除率可达90%和95%。

Application of Ferrous-Hydrogen Peroxide Process for the Treatment of Wastewater from Dye Intermediate DSD Acid Manufacturing Processes

A pretreatment method for the biological treatment of wastewater from DSD acid manufacturing processes,a refractory dye intermediate wastewater,based on combined Fe²⁺-H₂O₂ oxidation and coagulation-flocculation, has been developed. When the wastewater was treated with Fe²⁺-H₂O₂ oxidation(Fe²⁺] = 150mg/L, H₂O₂]= 7g/L)after a flocculation using an organic flocculant TS-1 at a dosage of 3g/L, the overall COD and colour removals were 64% and 62%,respectively. BOD₅/COD value of the tracted wastewater was 0.3.Fe²⁺-H₂O₂ oxidation treatment can reduce the solubility of organic molecules with sulfonic group and increace the efficiency of coagulation treatment.The COD and colour removals were both more than 90% when FeCL₃ was used as a coagulant which dosages of two stages coagulation were 5g/L and 2g/L after a Fe²⁺-H₂O₂ oxidation pretreatment at a H₂O₂ dosage of 2g/L.