College of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, China.
College of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, China.
Chemosphere. 2020 Oct;256:127064. doi: 10.1016/j.chemosphere.2020.127064. Epub 2020 May 14.
Passive air samplers comprising sorbent-Tenax-TA thermal desorption tubes were applied for monitoring cyclic volatile methyl siloxanes (cVMSs) in the air above the aeration tanks of eight wastewater treatment plants (WWTPs, including five "open" and three "close" plants) in Dalian, China. The aim was to investigate the inputs of cVMSs from WWTPs to the air throughout a year (June 2016-July 2017). The ∑cVMS concentrations were averaged at 3.14 ± 6.84 μg·m³ with D5 as the dominant compound (contributing to 63.8% of the ∑cVMS concentration). The annual average concentrations of D4, D5, and D6 in the air of the "close" WWTPs were 5.33 ± 4.63, 13.4 ± 14.4, and 1.05 ± 1.47 μg·m³, and 1.31 ± 1.29, 1.57 ± 2.01, and 0.301 ± 0.340 μg·m³ in the air from the "open" WWTPs, respectively. For both the close and open aeration tanks, the concentration of ∑cVMSs was the highest in summer and the lowest in winter, showing a significant correlation with ambient temperature (linear regression; p < 0.01). A simplified Gaussian dispersion model and a single chamber model were introduced to estimate annual emissions (kg·yr) of cVMSs from "open" and "close" WWTPs, ranging from 86.9 to 165 kg yr and from 203 to 278 kg yr, respectively. Examining the relationship between the per capita emissions of cVMSs and average property prices, our results indicated that a greater amount of personal care products were used/discharged by people with relatively higher socioeconomic status.
采用装有吸附剂- Tenax-TA 热解吸管的被动空气采样器，监测了中国大连 8 个污水处理厂（包括 5 个“开放式”和 3 个“封闭式”污水处理厂）曝气池上方空气中的环状挥发性甲基硅氧烷（cVMSs）。目的是在一年（2016 年 6 月至 2017 年 7 月）内调查污水处理厂向空气中排放 cVMSs 的情况。∑cVMS 浓度平均值为 3.14±6.84μg·m³，其中 D5 为主要化合物（占∑cVMS 浓度的 63.8%）。“封闭式”污水处理厂空气中 D4、D5 和 D6 的年平均浓度分别为 5.33±4.63、13.4±14.4 和 1.05±1.47μg·m³，“开放式”污水处理厂空气中的浓度分别为 1.31±1.29、1.57±2.01 和 0.301±0.340μg·m³。无论是封闭式还是开放式曝气池，∑cVMSs 的浓度在夏季最高，冬季最低，与环境温度呈显著相关（线性回归；p<0.01）。引入简化的高斯扩散模型和单室模型来估算“开放式”和“封闭式”污水处理厂每年排放的 cVMSs（kg·yr），范围分别为 86.9 至 165kg·yr 和 203 至 278kg·yr。考察 cVMSs 人均排放量与平均房地产价格之间的关系，结果表明，社会经济地位较高的人使用/排放的个人护理产品较多。
