Research Institute of Environmental Engineering, East China University of Science and Technology, Shanghai 200237, PR China.
J Hazard Mater. 2009 Dec 30;172(2-3):1446-9. doi: 10.1016/j.jhazmat.2009.08.010. Epub 2009 Aug 8.
Fenton and Fenton-like reactions employed for oxidative treatment of a typical industrial wastewater generate a large amount of ferric hydroxide sludge which has to be properly disposed at a high cost. This paper presents a simple and cost-effective method for recovering the iron catalyst from the iron hydroxide sludge for oxidative treatment of industrial wastewaters. The sludge was dewatered, dried and baked at 350-400 degrees C for 20-30 min; the residual solids were dissolved in sulfuric acid to form the reusable catalyst for Fenton and Fenton-like reactions. The recovered catalyst was highly effective for the oxidative pretreatment of a fine chemical wastewater to improve its biodegradability; the resulting COD removal and BOD(5)/COD ratio of the treated stream remained nearly unchanged during the time period when the regenerated catalyst was reused six times. The simple and effective catalyst regeneration method will make Fenton and Fenton-like oxidation a more cost-effective wastewater treatment alternative.
芬顿及类芬顿反应被用于典型工业废水的氧化处理，会产生大量的铁氢氧化物污泥，这些污泥必须以高成本进行妥善处理。本文提出了一种简单且具成本效益的方法，从铁氢氧化物污泥中回收铁催化剂，用于工业废水的氧化处理。将污泥脱水、干燥，然后在 350-400°C 下烘烤 20-30 分钟；残余固体溶解在硫酸中，形成可重复使用的芬顿和类芬顿反应催化剂。回收的催化剂对精细化工废水的氧化预处理非常有效，可提高其生物降解性；在再生催化剂重复使用六次的时间段内，处理后废水中的 COD 去除率和 BOD(5)/COD 比值几乎保持不变。这种简单有效的催化剂再生方法将使芬顿及类芬顿氧化成为更具成本效益的废水处理方法。
