Abstract:

Using nitric acid-modified activated carbon prepared as catalyst，Catalytic Wet Peroxide Oxidation（CWPO） was used to treat the membrane filtration concentrate of landfill leachate. The effects of reaction temperature，reaction time，oxidant dosage and catalyst dosage on the COD treatment effect of CWPO process were investigated. The dissolved organic matter in water samples was analyzed by 3D fluorescence spectroscopy，ultraviolet-visible spectroscopy and GC-MS solid-phase extraction. The results showed that the optimum operating conditions of the process were as follows：Reaction temperature 280 ℃，reaction time 120 min，n（H₂O₂）∶n（COD）=2.0，mass concentration of catalyst 10 g/L，initial pH=7. Under the optimal conditions，CWPO was used to treat the waste leachate membrane filtration concentrate，the COD was reduced from 91 900 mg/L to 2 900 mg/L，the removal rate was 96.8%，and the BOD₅/COD was increased from 0.002 to 0.15，the biodegradability was improved evidently. After the reaction，the humification degree of the concentrated liquid and the aromatic substances were reduced，which was conducive to the subsequent physicochemical treatment of the concentrated liquid.

Key words: Catalytic Wet Peroxide Oxidation, activated carbon, UV-Vis spectroscopy, three-dimensional fluorescence spectroscopy, GC-MS

摘要：

制备硝酸改性活性炭，将其作为催化剂，采用催化湿式过氧化氢氧化法（CWPO）对填埋场垃圾渗滤液膜滤浓缩液进行处理，考察了反应温度、反应时间、氧化剂投加量和催化剂投加量对CWPO工艺COD处理效果的影响，并采用三维荧光光谱、紫外-可见光谱和GC-MS固相萃取对水样中溶解性有机物进行分析。研究结果表明，该工艺最佳运行条件为：反应温度280 ℃，反应时间120 min，n（H₂O₂）∶n（COD）=2.0，催化剂硝酸改性活性炭投加质量浓度10 g/L，初始pH为7。在此最佳条件下采用CWPO处理垃圾渗滤液膜滤浓缩液，其COD从91 900 mg/L降低至2 900 mg/L，去除率达到96.8%，BOD₅/COD由0.002上升至0.15，可生化性大大提高。反应后浓缩液腐殖化程度降低，芳香类物质减少，有利于后续浓缩液的物化处理。

关键词: 催化湿式氧化, 活性炭, 紫外-可见光光谱, 三维荧光光谱, GC-MS

CLC Number: 

• X703.1