Received date: 2005-06-26
Revised date: 2005-06-26
Online published: 2010-10-01
A new method of treating wastewater from the 4,4′-diaminostilbene-2,2′-disulfonic acid (DSD) industries is proposed.The wastewater is oxidized by Fenton reagent at 70-80 ℃.The range of the inital pH of the water sample is 1-4,the volume ratio of H2O2 to wastewater is 1×10-3 and it is put into the wastewater by three times with the reaction time of 30 min.Then the wastewater is flocculated and filtrated twice by using Ca(OH)2 and FeSO4·7H2O as coagulation agents.It should be noted that the first flocculation is performed with the use of filter cake from the former batch.FeSO4·7H2O with the equivalent concentration of 6.25 g/L is used in the second flocculation.The total amount of Ca(OH)2 used in one batch is 7.5 g/L.Industrial scale experiment has also been carried out and satisfied result has been yielded.
Li Guozhu, Zhang Fengbao, Zhang Guoliang, Jia Chunyan, Zhang Zhongling . Treatment of DSD acid was tewater by oxidation and flocculation[J]. Industrial Water Treatment, 2005 , 25(9) : 30 -33 . DOI: 10.11894/1005-829x.2005.25(09).30
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