研究报告
邓禺南,陈炜鸣,崔瑜旗,易小莹,李启彬.铁碳促进O3/H2O2体系深度处理准好氧矿化垃圾床渗滤液尾水中难降解有机物[J].环境科学学报,2018,38(11):4371-4382
铁碳促进O3/H2O2体系深度处理准好氧矿化垃圾床渗滤液尾水中难降解有机物
- Degradation of recalcitrant organics in SAARB treatment effluent of landfill leachate by iron-carbon-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
- 邓禺南
- 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
- 崔瑜旗
- 西南交通大学地球科学与环境工程学院, 成都 611756
- 易小莹
- 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：构建了铁碳-O3/H2O2体系降解矿化垃圾床渗滤液尾水中有机物，并考察了体系O3、铁碳及H2O2投加量、初始pH值和反应时间对铁碳-O3/H2O2体系处理渗滤液尾水的影响.结果表明，在铁碳投加量为3 g·L-1，O3投加量为9.798 mg·min-1，H2O2投加量为2 mL·L-1，初始pH值为3的条件下，反应10 min后，渗滤液尾水的COD和UV245分别从711.96 mg·L-1、0.19下降至295.04 mg·L-1、0.10.类比实验结果表明，铁碳-O3/H2O2体系对渗滤液尾水有机物具有较高的去除率，且可生化性得到提高（BOD/COD从0.04增加至0.40）.紫外-可见和三维荧光光谱显示，废水中难降解有机物转化为小分子有机化合物且腐殖质的分子缩合度降低.最后，采用SEM-EDS、XRD和XPS技术对铁碳-O3/H2O2体系的反应机理进行了解析，发现铁碳-O3/H2O2反应的机理为铁碳微电解反应、铁氧化物-H2O2非均相芬顿反应、O3/H2O2、铁碳-O3非均相的高级氧化作用和铁基胶体对有机物的吸附沉淀作用.研究表明，铁碳-O3/H2O2体系是一种能够有效去除矿化垃圾床渗滤液尾水中难降解有机物的方法.
- Abstract：The SAARB treatment effluent of landfill leachate (SAARB effluent) was further degraded by iron-carbon-O3/H2O2 process. Firstly, key operational parameters (e.g., ozone dosage, iron-carbon dosage, H2O2 dosage, initial pH and reaction time) were investigated in batch experiments, respectively. Results show that after 10 min of iron-carbon-O3/H2O2 treatment, the COD and UV254 of SAARB effluent decreased from 711.96 mg·L-1 and 0.19 AU to 295.04 mg·L-1 and 0.10 AU, under initial pH 3.0, iron-carbon dosage of 3 g·L-1, H2O2 dosage of 2 mL·L-1 and O3 dosage of 9.798 mg·min-1. In comparison, results of control experiments indicate that a higher removal efficiency of organic substances and a greater biodegradability were achieved after iron-carbon-O3/H2O2 process. In addition, the results of the UV-vis and 3D-EEM analysis confirme that the refractory organics in SAARB effluent had been completely decomposed and transformed into low-molecule organic compounds and as a result, the BOD5/COD increased from 0.04 to 0.40 with the significant improvement of biodegradability. Finally, the reaction mechanism of the iron-carbon-O3/H2O2 process was proposed according to the results of SEM-EDS, XRD and XPS analysis. It is concluded that iron-carbon-O3/H2O2 process is mainly attributed to (a) micro-electrolysis of Fe-C; (b) heterogeneous Fenton reaction formed by iron-based oxides and H2O2; (c) O3/H2O2 process; (d) heterogeneous advanced oxidation of Fe-C catalyzed O3; (e) adsorption and precipitation effect by iron-based colloids. Therefore, iron-carbon-O3/H2O2 process was proven to be an effective and promising method to handle the SAARB effluent with optimized operation conditions.
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