Textile Pollution Controlling Engineering Center of Ministry of Environmental Protection, College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China; Shanghai National Engineering Research Center of Urban Water Resources Co., Ltd., Shanghai, 200082, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China.
Textile Pollution Controlling Engineering Center of Ministry of Environmental Protection, College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China.
Chemosphere. 2021 Feb;265:129068. doi: 10.1016/j.chemosphere.2020.129068. Epub 2020 Nov 21.
Endogenous pollution from sediments is gradually becoming a critical pollution source of the drinking water reservoir. Odorants can be released from sediments into the overlying water which further deteriorate the water quality of the drinking water reservoir. In this work, we set the sediment-overlying water systems under various water pH (6.5, 8 and 9), temperature (4, 20 and 30 °C) during 30 days and intermittent or continuous hydraulic disturbances (at 100 r/min or 200 r/min) in 5 days, and investigated the dynamic release of odorants from the drinking water reservoir sediments via using headspace solid-phase microextraction (HSPME) and gas chromatography-mass spectrometry (GC-MS). The result shows that weakly alkaline environment slightly but not significantly increased the concentration of dimethyl disulfide (DMDS) in the overlying water. Furthermore, low temperature promoted the release of bis(2-chloroisopropyl) ether (BCIE) and geosmin to 108.36 and 18.98 ng/L, respectively, while high temperature facilitated the DMDS release to 20.33 ng/L. Notably, hydraulic disturbances drastically elevated the level of seven odorants released from the sediments. Specially, benzaldehyde exhibited highest concentration at 260.50 ng/L. The continuous disturbance greatly enhanced the release of benzaldehyde, DMDS, dimethyl trisulfide (DMTS), BCIE and 1,4-dichloro-benzene (1,4-DCB) from sediments with a positive disturbance speed-dependence. However, the intermittent disturbance promoted higher level of geosmin in the overlying water compared to the continuous disturbance. Only continuous hydraulic disturbance at high speed could lead to the release of ethylbenzene from sediments, which was up to 4.89 ng/L in 12 h.
底泥内源污染正逐渐成为饮用水水源的一个重要污染源。嗅味物质可从底泥中释放到上覆水体中，从而进一步恶化饮用水水源的水质。在这项工作中，我们在不同的水 pH 值（6.5、8 和 9）、温度（4、20 和 30°C）下设置了底泥-上覆水体系，在 5 天内进行了间歇性或连续性水力干扰（100 r/min 或 200 r/min），并通过顶空固相微萃取（HSPME）和气相色谱-质谱联用（GC-MS）研究了饮用水库底泥中嗅味物质的动态释放。结果表明，弱碱性环境略微但不显著增加了上覆水中二甲基二硫（DMDS）的浓度。此外，低温促进了双（2-氯异丙基）醚（BCIE）和土臭素的释放，分别达到 108.36 和 18.98 ng/L，而高温则有利于 DMDS 释放到 20.33 ng/L。值得注意的是，水力干扰剧烈地增加了从沉积物中释放的七种嗅味物质的水平。特别地，苯甲醛在 260.50 ng/L 时表现出最高浓度。连续干扰极大地促进了苯甲醛、DMDS、二甲基三硫（DMTS）、BCIE 和 1,4-二氯苯（1,4-DCB）从沉积物中的释放，呈现出与干扰速度呈正相关的关系。然而，间歇性干扰比连续干扰更能促进上覆水中土臭素的释放。只有高速连续水力干扰才能导致乙基苯从沉积物中释放出来，在 12 小时内达到 4.89 ng/L。
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