海水提铀螯合树脂制备中高浓度丙烯腈废水的处理方法研究

Study on the Treatment of High-concentrated Acrylonitrile Wastewater in the Preparation of Chelate Resin for Extracting Uranium from Seawater

在海水提铀螯合树脂的研究和制备中,会产生大量高浓度丙烯腈废水,其CODCr高达110 770 mg·L-1。以该废水为研究对象,采用Fe-C微电解法、Fenton-UV氧化法和KMnO4氧化等物理化学方法对其进行处理,发现单一方法的CODCr去除率较低,将上述方法进行串联,对废水进行处理,结果表明串联的方式可以明显提高废水的CODCr去除率。采用Fe-C微电解法、Fenton-UV氧化法和KMnO4氧化法3种方法串联的方式处理高浓度丙烯腈废水时,CODCr的去除率高达99.1%,CODCr降至957 mg·L-1,BOD5为406 mg·L-1,BOD5/CODCr为0.42,显著提高了水样的可生化性,达到了化纤工业废水的三级排放标准(GB8978-1996)。研究结果为海水提铀螯合树脂制备中高浓度丙烯腈废水的处理提供了一条有效的技术途径。

In the preparation of chelate resin for extracting uranium from seawater, it has produced a large amount of high-concentrated acrylonitrile wastewater, of which the CODcr is up to 110 770 mg.L-1. In this paper, the wastewater was treated with Fe - C micro-electrolysis, Fenton - UV oxidation, and KMnO4 oxidation. The results show that the removal rates of CODcr are very low, when single method was applied to treat the wastewater. Treatment of the wastewater via combination of the three methods could obviously increase the removal rates of CODcr. When the wastewater was treated via combination of Fe - C micro-e- lectrolysis, Fenton -UV oxidation, and KMnO4 oxidation, the removal rate of CODcr is up to 99. 1%, CODcr is 957 mg .L-1 ,BODs is 406 mg.L-1 , BODs/CODcr is 0.42. This improves the biodegradability of wastewaster, meets the grade -Ⅲ standard for discharge of chemical fibre industrial wasterwater. The results can provide an effective technological path for treatment of wastewater containing high concentration acrylonitrile in the preparation of chelate resin for extracting uranium from seawater.