摘要
通过对汛期调蓄池运行过程中进水、存水、排水和闲置四个阶段的池内污水表面的硫化氢和氨气浓度的监测,分析调蓄池的臭气排放规律,为调蓄池使用过程中臭气的去除和有效控制提供依据。在调蓄池的运行过程中,进水阶段的NH3和H2S浓度均值均超出《恶臭污染物排放标准》中的二级标准,NH3和H2S浓度的最大值则出现在存水阶段。调蓄池臭气的控制主要针对进水阶段由于大量雨污水瞬间跌落,臭气在气液两相中重新分配而形成的逸散行为,以及存水阶段停留时间超过20 h后,在厌氧环境中生成臭气而导致NH3和H2S浓度的激增行为。进水阶段的臭气浓度激增主要靠工程的方法控制,存水阶段的臭气浓度控制可以通过改变运行方式实现,如及时排水等。NH3和H2S浓度随着调蓄池闲置时间的增加而不断衰减,H2S由于氧化和扩散的作用,其衰减效果更为明显。
In heavy rainfall period, the monitoring of hydrogen sulfide and ammonia concentration during the inflow, storage, discharge and empty phases of retention basin was carried out. Odor emission from retention basin was analyzed to provide reference basis for removing and controlling the odors. During the operation of retention basin, the concentrations of hydrogen sulfide and ammonia during the inflow phase exceeded the second level criteria specified in the Emission Standards for Odor Pollutants （GB 14554 -93 ）. The maximum concentrations of hydrogen sulfide and ammonia were during the storage phase. Odor control should focus on the escape of odors caused by gas-liquid redistribution due to instan- taneous fall of rainwater and sewage during the inflow phase. A sharp increase in concentrations of hydrogen sulfide and ammonia occurred during the storage phase when the retention time was over 20 h. Odor control during the inflow phase depended on engineering controls and that during the storage phase required changing operation mode variables such as discharge time. The concentrations of hydrogen sulfide and ammonia decreased with the increase of empty time. The decrease in hydrogen sulfide concentration was more discemable due to oxidation and diffusion.
出处
《中国给水排水》
CAS
CSCD
北大核心
2012年第17期12-16,共5页
China Water & Wastewater
基金
国家水体污染控制与治理科技重大专项(2008ZX07317-001)
关键词
调蓄池
臭气
H2S
NH3
retention basin
odor
hydrogen sulfide
ammonia
作者简介
作者简介：李怀正（1962-），男，山东莒南人，硕士，研究员，研究方向为水污染控制理论与技术。E—mail：lihz_tj@yahoo．cn
