水中聚乙烯微塑料风化行为对混凝过程的影响

徐铭遥; 彭少茵; 齐飞; 李晨; 王振北; 郭明宇

doi:10.12153/j.issn.1674-991X.20220032

水中聚乙烯微塑料风化行为对混凝过程的影响

doi: 10.12153/j.issn.1674-991X.20220032

北京林业大学环境科学与工程学院

基金项目: 大学生创新创业训练计划项目（X201910022166）；国家自然科学基金青年基金项目（52100002）；城市水资源与水环境国家重点实验室开放课题（QA202014）；北京林业大学中央高校基本科研业务费专项（BLX201933）；国家重点研发计划项目（2021YFE0100800）；中国博士后科学基金（2021M700448）

详细信息

作者简介:
徐铭遥（1998—），女，硕士，研究方向为滤饼层动态膜协同超滤膜处理技术，xvmingyao@163.com

通讯作者:
王振北（1989—），男，讲师，博士，研究方向为水中颗粒特征动态演变及膜法水处理技术，wangzhenbei119@163.com

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出版历程
- 收稿日期: 2022-01-12

Effect of weathering behavior of polyethylene microplastics in water on coagulation process

College of Environmental Science and Engineering, Beijing Forestry University

摘要

摘要:
以地表水中丰度较高的聚乙烯（PE）微塑料作为研究对象，开展吸附和混凝试验，在解析PE微塑料对水中有机物吸附能力的基础上，用氙灯对PE微塑料进行光老化以模拟微塑料在自然条件下的风化行为，深入研究PE微塑料风化行为对混凝过程的影响。结果表明：粒度为50~200目的PE微塑料对有机物的吸附量为310~350 mg/g（以碳计），不存在显著的吸附性能差异。在混凝过程中，相较于未添加PE微塑料的情况，添加未风化的PE微塑料会降低有机物去除率，而添加风化PE微塑料则能明显提升有机物去除率。同时，混凝过程对风化PE微塑料的去除率高于未风化PE微塑料，表明PE微塑料的风化行为有利于其在混凝过程中被去除。根据混凝过程中絮体特征可知，PE微塑料的风化行为对形成絮体的尺寸影响极小，但能显著提高絮体的生长速度。
- 聚乙烯微塑料 /
- 风化行为 /
- 混凝过程 /
- 有机物去除 /
- 絮体特征
Abstract:
Polyethylene (PE) microplastics with high abundance in surface water were used as the research object to conduct adsorption and coagulation experiments. Based on the study regarding the organic matter adsorption capacity of PE microplastics, the effect of weathering behavior of PE microplastics on the coagulation process was further explored by using photoaged PE microplastics with xenon lamp to simulate weathering behavior of microplastics under natural conditions. The results showed that PE microplastics with particle size 50-200 mesh could adsorb 310-350 mg/g (calculated by carbon) organic matter, indicating that the microplastic size would not significantly influence the adsorption performance of PE microplastics. In coagulation, compared with no PE microplastics conditions, the addition of unweathered PE microplastics was prone to decrease the organic matter removal rate, while the addition of weathered PE microplastics was able to obviously increase the removal efficiency of organic matter. Furthermore, the removal rate of weathered PE microplastics was remarkably higher than that of unweathered PE microplastics in coagulation, which suggested that the weathering behavior was beneficial to PE microplastics removal during the coagulation process. According to the floc properties in coagulation, it was notable that both unweathered and weathered PE microplastics would not influence floc average size in coagulation, but significantly increased the growth rate of flocs in this process.
- polyethylene microplastics /
- weathering behavior /
- coagulation process /
- organic matter removal /
- floc properties

HTML全文

图 1 PE微塑料粒度对其有机物吸附性能的影响

Figure 1. Effect of particle size of PE microplastics on organic matter adsorption performance

下载: 全尺寸图片幻灯片

图 2 微塑料对混凝过程有机物去除性能影响

Figure 2. Effect of microplastics on organic matter removal performance in coagulation process

下载: 全尺寸图片幻灯片

图 3 微塑料样品中的化学官能团变化的FT-IR

Figure 3. Changes of chemical functional groups in microplastic samples (FT-IR)

下载: 全尺寸图片幻灯片

图 4 不同混凝剂投加量条件下混凝出水中风化PE微塑料形态

Figure 4. Image of weathered microplastics in coagulated effluent under different coagulant dosages

下载: 全尺寸图片幻灯片

图 5 不同混凝剂投加量条件下混凝出水中未风化PE微塑料形态

Figure 5. Image of unweathered microplastics in coagulated effluent under different coagulant dosages

下载: 全尺寸图片幻灯片

图 6 不同混凝剂投加量条件下原水混凝过程中絮体粒径的变化

Figure 6. Change of floc particle size in different surface water coagulation processes under different coagulant dosages

下载: 全尺寸图片幻灯片

图 7 不同模拟地表水混凝过程中絮体生长速度的变化

Figure 7. Change of floc growth rate in different simulated surface water coagulation processes

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表 1 混凝出水中PE微塑料数量及去除率

Table 1. Quantity and removal rate of PE microplastics in coagulated water

混凝剂投加量/ （mg/L）	未风化PE微塑料		风化PE微塑料
混凝剂投加量/ （mg/L）	数量/个	去除率/%	数量/个	去除率/%
15	56±3	5.90±1.37	26±2	48.40±1.88
20	44±4	22.64±1.91	22±0	55.86±2.65
25	38±2	36.70±2.51	20±5	59.61±4.24
30	16±3	72.66±1.65	11±2	80.13±1.31
35	46±6	23.30±2.98	24±3	53.30±3.98

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