研究报告
刘虹,陈炜鸣,蒋国斌,邓禺南,李启彬.GAC-O3/H2O2体系去除准好氧矿化垃圾床渗滤液尾水中难降解有机物的研究[J].环境科学学报,2018,38(9):3622-3629
GAC-O3/H2O2体系去除准好氧矿化垃圾床渗滤液尾水中难降解有机物的研究
- A study on degradation of refractory organics in leachate effluent from semi-aerobic aged refuse biofilter by GAC-O3/H2O2 process
- 基金项目：四川省高校特种废水处理重点实验室开放课题（No.SWWT2015-4）
- 作者
- 单位
- 刘虹
- 西南交通大学地球科学与环境工程学院, 成都 611756
- 陈炜鸣
- 西南交通大学地球科学与环境工程学院, 成都 611756
- 蒋国斌
- 西南交通大学地球科学与环境工程学院, 成都 611756
- 邓禺南
- 西南交通大学地球科学与环境工程学院, 成都 611756
- 李启彬
- 西南交通大学地球科学与环境工程学院, 成都 611756
- 摘要：为了降低准好氧矿化垃圾床渗滤液尾水中有机物浓度和提高体系可生化性，构建了GAC （粒状活性炭）-O3/H2O2体系催化降解矿化垃圾床渗滤液尾水中有机物.同时，考察了体系O3、GAC和H2O2投加量、初始pH值对GAC-O3/H2O2体系处理渗滤液尾水的影响，并使用分子量分布、紫外-可见光谱和三维荧光光谱解析了难降解有机物在GAC-O3/H2O2体系的转化机制.结果表明：在GAC投加量为10 g·L-1，O3投加量为32.16 mg·min-1，H2O2投加量为3 mL·L-1，初始pH值为5的条件下，反应20 min后，其渗滤液尾水的COD和UV245分别从700.08 mg·L-1和0.488下降到393.85 mg·L-1和0.244，COD和UV254的去除率分别为43.80%和50.00%.经GAC-O3/H2O2体系处理后，得益于含芳香环有机物的有效降解，渗滤液尾水中大分子有机物（大于50 kDa）明显减少，分子量小于1 kDa的有机物比例增多.与此同时，紫外区类富里酸荧光区及可见光区类富里酸荧光区峰值也大幅降低，其去除率分别为70.20%和58.69%，B/C从0.04增加到0.35，这也使得废水可生化性大幅提高.
- Abstract：Granular activated carbon (GAC)-O3/H2O2 process was used to decompose organics in leachate effluent from semi-aerobic aged refuse biofilter and improve its biodegradability. Effects of O3 dosage, GAC dosage, H2O2 dosage, and initial pH on COD and UV254 of leachate effluent were systematically studied, and molecular weight distribution (MWD), UV-Vis and 3D-EEM tests were applied to investigate the transformation mechanism of recalcitrant organics during GAC-O3/H2O2 process. Results show that COD and UV254 of leachate effluent decreased from 700.08 mg·L-1 and 0.488 to 393.85 mg·L-1 and 0.244, respectively, and the removal efficiencies were 43.80% and 50.00%, under 10 g·L-1 of GAC, 32.16 mg·min-1 of O3, 3 mL·L-1 of H2O2, pH 5 and 20 min of reaction. After treatment with GAC-O3/H2O process, due to the effective degradation of aromatic nucleus organics, the content of macromolecule organics (greater than 50 kDa) in the leachate decreased significantly and the proportion of organic compounds with molecular weights less than 1 kDa increased. Meanwhile, peak values of fulvic-like in ultraviolet region and fulvic-like in visible region remarkably reduced, specifically removal efficiencies were 70.20% and 58.69%, respectively, the B/C increased from 0.04 to 0.35, which also greatly proved biodegradability of leachate effluent.
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