Department of Environmental Health, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran.
J Hazard Mater. 2009 Nov 15;171(1-3):907-13. doi: 10.1016/j.jhazmat.2009.06.090. Epub 2009 Jun 23.
The catalytic advanced oxidation process (CAOP) of O(3)/MgO/H(2)O(2) was integrated with a sequencing batch reactor (SBR) system to completely treat concentrated formaldehyde wastewater, demonstrating that this combination is an effective method for treating such wastewaters. The influence of several operational variables--including pH, MgO powder dosage, and the concentrations of H(2)O(2) and O(3)--was investigated for the O(3)/MgO/H(2)O(2) degradation of a 7000 mg/L formaldehyde wastewater. The optimum conditions were found to be a pH of 8, 5 g/L dose of MgO powder, 0.09 mole/L concentration of H(2)O(2), and 0.153 g/L min dose of O(3). The formaldehyde and COD concentrations were reduced 79% and 65.6%, respectively, in the CAOP for 120 min of reaction time under the optimum condition stated above. The remaining concentrations of formaldehyde and COD were 1500 mg/L and 3200 mg/L, respectively, in the effluent. The degradation of formaldehyde in CAOP was determined to be a first-order reaction with a constant of 0.015/min, and radical oxidation was the predominant degradation mechanism. This effluent was post-treated in SBR system for a total cycle time of 24h. The SBR completely removed the formaldehyde and removed 98% of the COD, reducing the COD concentration to lower than 60 mg/L. Therefore, the integrated O(3)/MgO/H(2)O(2) and SBR process is demonstrated as a promising technology for the complete treatment of wastewater with high concentrations of toxic and inhibitory compounds such as formaldehyde.
臭氧/氧化镁/过氧化氢（O3/MgO/H2O2）的催化高级氧化工艺（CAOP）与序批式反应器（SBR）系统相结合，用于完全处理高浓度甲醛废水，证明该组合是处理此类废水的有效方法。研究了几种操作变量，包括 pH 值、氧化镁粉末用量以及 H2O2 和 O3 的浓度，对 7000mg/L 甲醛废水的 O3/MgO/H2O2 降解进行了研究。发现最佳条件为 pH 值为 8、氧化镁粉末用量为 5g/L、H2O2 浓度为 0.09 摩尔/L 和 O3 剂量为 0.153g/L min。在上述最佳条件下，CAOP 反应 120 分钟后，甲醛和 COD 浓度分别降低了 79%和 65.6%。在废水出口处，甲醛和 COD 的剩余浓度分别为 1500mg/L 和 3200mg/L。CAOP 中甲醛的降解被确定为一级反应，其速率常数为 0.015/min，自由基氧化是主要的降解机制。该废水在 SBR 系统中进一步处理，总循环时间为 24h。SBR 完全去除了甲醛，并去除了 98%的 COD，将 COD 浓度降低至 60mg/L 以下。因此，O3/MgO/H2O2 和 SBR 集成工艺被证明是一种有前途的技术，可用于完全处理高浓度有毒和抑制性化合物（如甲醛）的废水。
