Beijing Key Lab for Source Control Technology of Water Pollution, Engineering Research Center for Water Pollution Source Control & Eco-remediation, College of Environmental Science & Engineering, Beijing Forestry University, Beijing 100083, China.
Beijing Key Laboratory of Airborne Particulate Matter Monitoring Technology, Beijing 100048, China; Beijing Municipal Ecological and Environmental Monitoring Center, Beijing 100048, China.
Sci Total Environ. 2021 Jul 1;776:145991. doi: 10.1016/j.scitotenv.2021.145991. Epub 2021 Feb 20.
Volatile sulfur compounds (VSCs) generated and discharged as air pollutants from wastewater treatment plants (WWTPs) pose a threat to human health and the environment. This study characterized VSC emissions from a full-scale sequencing batch reactor (SBR) WWTP at the water-air interface for one year. Results demonstrated that higher ambient temperatures and aeration contributed significantly to VSC emissions as the highest emissions occurred over summer during the feeding synchronous aeration period. VSC emissions were related to chemical oxygen demand and sulfate concentrations in wastewater, and empirical formulas based on these values were proposed that can be used to model VSC emission fluxes from SBR WWTP. VSC emission factors (μg·ton wastewater) throughout the SBR treatment process were: 361 ± 101 hydrogen sulfide (HS), 82 ± 76 methyl mercaptan (MT), 61 ± 31 dimethyl sulfide, 17 ± 5 carbon disulfide, and 46 ± 24 dimethyl disulfide. HS and MT were the dominant odors released. Findings from this study may be applicable for calculating VSC emissions during SBR wastewater treatment stages, and may be beneficial for determining methods and strategies to reduce VSCs.
污水处理厂（WWTP）作为空气污染物排放的挥发性硫化合物（VSCs）对人类健康和环境构成威胁。本研究在一年时间内对全规模序批式反应器（SBR）WWTP 的水-气界面的 VSC 排放进行了特征描述。结果表明，较高的环境温度和曝气对 VSC 排放有显著影响，因为在夏季喂食同步曝气期间排放量最高。VSC 排放与废水中的化学需氧量和硫酸盐浓度有关，并提出了基于这些值的经验公式，可用于模拟 SBR WWTP 的 VSC 排放通量。整个 SBR 处理过程中的 VSC 排放因子（μg·吨废水）为：361±101 硫化氢（HS）、82±76 甲硫醇（MT）、61±31 二甲基硫、17±5 二硫化碳和 46±24 二甲基二硫。HS 和 MT 是释放的主要气味。本研究的结果可适用于计算 SBR 废水处理阶段的 VSC 排放，有助于确定减少 VSCs 的方法和策略。
