| 引用本文: | 何席伟，高洁，张徐祥，任洪强.焦化废水生化处理过程中溶解性有机物及毒性变化规律[J].环境监控与预警,2022,14(2):15-24 |
| HE Xi-wei, GAO Jie, ZHANG Xu-xiang, REN Hong-qiang.Changes of Dissolved Organic Matter and Toxicity of Coking Wastewater During Biochemical Treatment[J].Environmental Monitoring and Forewarning,2022,14(2):15-24 |
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| 摘要: |
| 焦化废水中的溶解性有机物（DOM）作为废水污染物和毒性的主要来源受到广泛关注。厌氧-缺氧-好氧（A-A-O）生物法联合混凝沉淀工艺在焦化废水处理中被广泛应用。于2018年4，7和11月分别采集4座焦化废水处理厂废水，采用光谱学分析手段和水生生物急性毒性试验对A-A-O联合混凝沉淀处理过程中焦化废水的DOM和毒性变化进行分析。结果表明，焦化废水中含有大量不饱和芳香性物质，其中类色氨酸、络氨酸物质占主导，其次为类溶解性微生物代谢产物、类富里酸物质和类腐殖酸类物质；未经处理的焦化废水对藻类和大型溞的急性毒性等级为中毒至高毒。A-A-O联合混凝沉淀处理可去除90%以上的类色氨酸、络氨酸和类富里酸物质，但对类腐殖酸类物质去除率相对较低，仅为约80%，关键去除段为缺氧段和好氧段；该工艺对焦化废水急性毒性削减率为80.51%~94.30%，关键削减段为厌氧段。Pearson相关性分析结果显示，焦化废水溶解性总有机碳（TOC）、类腐殖酸类物质荧光组分C1和类富里酸类物质荧光组分C4与废水急性毒性存在显著正相关关系，可利用其作为水样急性毒性初筛的指示性指标。可为焦化废水生化处理的效能优化和废水毒性控制及安全评估提供科学支撑。 |
| 关键词: 焦化废水 溶解性有机物 三维荧光 急性毒性 |
| DOI： |
| 分类号:X784 |
| 基金项目:国家自然科学基金资助项目（51908276）；南京大学卓越计划基金资助项目（ZYJH005） |
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| Changes of Dissolved Organic Matter and Toxicity of Coking Wastewater During Biochemical Treatment |
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HE Xi-wei, GAO Jie, ZHANG Xu-xiang, REN Hong-qiang
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State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu 210023, China
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| Abstract: |
| Dissolved organic matter (DOM) in coking wastewater has gained extensive attention as the main source of wastewater pollutants and toxicity. Anaerobic anoxic oxic (A-A-O) biological process combined with coagulation is widely used in coking wastewater treatment. In this study, the DOM and toxicity changes of coking wastewater during A-A-O combined coagulation treatment were analyzed by spectroscopy analysis and aquatic acute toxicity test. The results showed that coking wastewater contain large amount of unsaturated aromatic substances, in which tryptophan and tyrosine like substances were dominant, followed by soluble microbial metabolites, fulvic acid like substances and humic acid like substances. The rates of acute toxicity of untreated coking wastewater to algae and Daphnia magna were moderately to highly toxic. A-A-O combined coagulation treatment could remove more than 90% of tryptophan, tyrosine and fulvic acid like substancess, but the removal rate of humic acid like substances was relatively lower (80%), with the key removal stages being the anoxic stage and the aerobic stage. Accordingly, the acute toxicity reduction rate of coking wastewater was 80.51%~94.30%, and the key reduction occured in the anaerobic stage. Pearson correlation analysis showed significantly positive correlations among total organic carbon (TOC), fluorescent component C1, fluorescent component C4 with acute toxicity of coking wastewater, indicating possible utilization of TOC, C1 and C4 for preliminary screening before conducting toxicity tests. The results of this study can provide scientific support for the optimization of biochemical treatment, toxicity control as well as risk evaluation of coking wastewater. |
| Key words: Coking wastewater Dissolved organic matter Excitation emission matrix Acute toxicity |
