WANGZhen-yi,KONGLing-yu,YANXiao-yu,et al.Optimization of Odor Compound Detection and Its Removal Efficiency by Ozone Microbubbles[J].China Water & Wastewater,2025,41(21):52-59.
嗅味物质检测优化及臭氧微气泡对其去除效能
- Title:
- Optimization of Odor Compound Detection and Its Removal Efficiency by Ozone Microbubbles
- 关键词:
- 顶空固相微萃取气相色谱质谱法; 嗅味物质; 余氯; 臭氧微纳米气泡; 过硫酸盐
- Keywords:
- HS-SPME-GC-MS; odor compound; residual chlorine; ozone micro-nano bubble; peroxymonosulfate
- 摘要:
- 顶空固相微萃取气相色谱质谱法是检测典型嗅味物质土臭素（GSM）和2-甲基异莰醇（2-MIB）的标准方法，拥有较高的准确度和精确度，但是原水中的部分物质会干扰检测结果。为探究常规工艺对嗅味物质检测结果的影响，在河北省某水厂进行了实验，发现消毒工艺的影响最大，可导致GSM和2-MIB的检测结果出现18.4%和12.1%的相对误差。由此，提出了投加硫代硫酸钠脱氯的预处理方案。当水中存在1.5 mg/L的余氯时，投加100 ng/L的GSM和80 ng/L的2-MIB，其检测结果会分别降低至实际值的82.3%和84.1%，脱氯后能恢复至99.2%和91.9%。同时，研究了臭氧（O3）微纳米气泡联合过硫酸盐（PMS）去除2-MIB的效能，考察了曝气方式、臭氧浓度和过硫酸盐浓度对去除率的影响。结果表明，在不投加PMS的情况下，向纯水中投加0.9 mg/L的液相臭氧浓度，分别使用微纳米气泡曝气和常规曝气处理后，相比于后者，前者对2-MIB的去除率提升了14.5%。并且，在两种曝气方式下，对2-MIB的去除效果与PMS投加量呈现相反的趋势，其原因可能是不同的曝气方式和O3/PMS投加比的变化会导致去除效果发生改变。
- Abstract:
- Headspace solid-phase microextraction coupled with gas chromatography-mass spectrometry (HS-SPME-GC-MS) is the standard analytical method for the detection of characteristic odor compounds such as geosmin (GSM) and 2-methylisoborneol (2-MIB), offering high accuracy and precision. However, certain components present in raw water samples may interfere with the analytical results. An experimental study was conducted at a water treatment plant in Hebei Province to investigate the influence of conventional treatment processes on the detection of odor compounds. The results indicated that the disinfection process exerted the most significant impact, introducing relative errors of 18.4% and 12.1% in the quantification of GSM and 2-MIB, respectively. To mitigate this interference, a pretreatment method involving sodium thiosulfate addition for dechlorination was proposed. When the water contained 1.5 mg/L of residual chlorine, the addition of 100 ng/L of GSM and 80 ng/L of 2-MIB resulted in measured results that were reduced to 82.3% and 84.1% of their true values, respectively. Following dechlorination, the results were recovered to 99.2% and 91.9% of their true values, respectively. Meanwhile, the efficacy of ozone (O3) micro-nano bubbles in combination with peroxymonosulfate (PMS) for the removal of 2-MIB was evaluated, and the influences of aeration mode, ozone concentration, and PMS concentration on the removal efficiency were systematically investigated. Without the addition of PMS, a liquid?phase ozone concentration of 0.9 mg/L was introduced into pure water. Following treatment via micro-nano bubble aeration and conventional aeration, respectively, the removal efficiency of 2-MIB was 14.5% higher with micro?nano bubble aeration compared to conventional aeration. Moreover, the removal efficiency of 2-MIB exhibited an opposite trend with respect to PMS dosage under the two aeration methods. This discrepancy might be attributed to the differing aeration methods and variations in the O3/PMS dosage ratio, which can influence the overall degradation performance.
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