Investigation of metaldehyde removal by powdered activated carbon from different water samples,Environmental Science: Water Research & Technology

当前位置： X-MOL 学术 › Environ. Sci.: Water Res. Technol. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Investigation of metaldehyde removal by powdered activated carbon from different water samples
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2020-03-19 , DOI: 10.1039/c9ew00962k
Zhuojun Li _{1,

2,

3,

4} , Juntao Li _{2,

3,

4,

5} , Zhengxiao Guo _{2,

3,

4,

5,

5} , Luiza C. Campos _{1,

2,

3,

4}

Affiliation

Metaldehyde as a widely used pesticide has been detected in surface water and drinking water in the UK with concentrations higher than the EU and UK standard (0.1 μg L⁻¹). Previous studies have shown that powdered activated carbon (PAC) can adsorb metaldehyde even with the presence of natural organic matter, suggesting a promising solution to the problem. This paper studies the adsorption of metaldehyde onto PAC using different water samples including synthetic water, natural surface water, and water samples taken at different treatment processes from a water treatment plant. Metaldehyde (5 μg L⁻¹) was effectively removed by PAC (50 mg L⁻¹) from all water samples in this study, regardless of the water quality (74.3% to 99.7%). A PAC dosage of 100 mg L⁻¹ was considered appropriate to remove metaldehyde at 5 μg L⁻¹ after the first treatment process of pre-ozone treatment with a maximum adsorption capacity (q_m) of 0.25 μg mg⁻¹ given by the data fitted to the Langmuir isotherm model. Removal of metaldehyde by PAC was found to be most effective when PAC was applied after the static flocculation treatment process (98.4%) with a q_m of 0.29 μg mg⁻¹. The low adsorption capacity of PAC for low initial concentrations of metaldehyde solution was observed due to the lower driving force for mass transfer in the process of adsorption and competition with water molecules for adsorption sites on PAC.

中文翻译：

粉末状活性炭从不同水样中去除乙醛的研究

在英国，地表水和饮用水中检测到的甲醛是一种广泛使用的农药，其浓度高于欧盟和英国的标准（0.1μgL ^-1）。先前的研究表明，即使存在天然有机物，粉末状活性炭（PAC）仍可以吸附甲醛，这是解决该问题的一种有前途的解决方案。本文研究了使用不同水样（包括合成水，天然地表水和在水处理厂从不同处理过程中获取的水样）对甲醛在PAC上的吸附。在本研究中，无论水质如何（74.3％至99.7％），均能通过PAC（50 mg L ^-1）从所有水样中有效去除甲醛（5μgL ^-1）。PAC剂量为100 mg L^-1被认为是适当的以5μgL至除去聚乙醛^-1具有最大吸附容量（预臭氧处理的第一处理过程之后q_米的0.25）微克毫克^-1通过嵌合于Langmuir等温模型的数据给出。由PAC聚乙醛的去除被发现当PAC静态絮凝处理工序（98.4％）与后施加是最有效的q_米0.29微克毫克^-1。由于在吸附过程中传质的驱动力较低，并且与水分子竞争PAC上的吸附位点，因此观察到PAC对低浓度的甲醛溶液的吸附能力较低。

更新日期：2020-03-19

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文