摘要
The pretreatment of refractory polyvinyl-alcohol （PVA） wastewater with low value of CODcr by Fenton＇s reagent was investigated to enhance the biodegradabilily. The effects of operating conditions such as pH of the solution, Fe2＋ dosage, H2O2 dosage, reaction time and initial PVA concentration on the removal efficiency of CODCr were discussed. It is demonstrated that the optimum value of pH for removal of CODcr is 5 and the most suitable dosages of H2O2 （2%） and FeSO4 （10 mg/L） are 5% and 8.0%, respectively. When the initial CODcr value of the PVA water is 760 mg/L, the favorable reaction time is 110 min. Under these optimum conditions, the removal ratio of CODcr is 58.6% 61.4%, and the value of biodegradability （CODB/CODcr） increases markedly from 8.9% 9.7% to 62.6% 68.3%.
The pretreatment of refractory polyvinyl-alcohol(PVA) wastewater with low value of CODCr by Fenton's reagent was investigated to enhance the biodegradability.The effects of operating conditions such as pH of the solution,Fe2+ dosage,H2O2 dosage,reaction time and initial PVA concentration on the removal efficiency of CODCr were discussed.It is demonstrated that the optimum value of pH for removal of CODCr is 5 and the most suitable dosages of H2O2(2%) and FeSO4(10 mg/L) are 5% and 8.0%,respectively.When the initial CODCr value of the PVA water is 760 mg/L,the favorable reaction time is 110 min.Under these optimum conditions,the removal ratio of CODCr is 58.6%-61.4%,and the value of biodegradability(CODB/CODCr) increases markedly from 8.9%-9.7% to 62.6%-68.3%.
基金
Project(08JCYBJC02600) supported by the Natural Science Foundation of Tianjin,China
Project(2008ZX07314-005-011) supported by the National Major Technological Program of China
