Source and Composition of Organic components in treated wastewater

处理后废水中有机成分的来源和组成

• 批准号: 11680566
• 负责人: SATOH Hiroyasu
• 金额: $ 2.3万
• 依托单位: THE UNIVERSITY OF TOKYO
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11680566/
• 关键词: activated sludge; trace organic materials; treated wastewater; protein; carbohydrates; 活性汚泥由来物質; 微生物産生物質

Although biological wastewater treatment is very efficient in removing organic pollutants in wastewater, there still remains trace level of roganic materials in treated wastewater. The trace organic materials can affect water environmtent if the source of a water body is mainly treated wastewater, where the watershed is densely populated. While the origin of the organic materials in treated wastewater is partly attributed to hardly biodegradable materials in influent wastewater, microorganisms used for wastewater treatment might be contributing as a source of organic materials in treated wastewater. Thus in the present study, we investigated the contribution of microorganisms in activated sludge to the organic materials in the treated wastewater. Activated sludge processes were operated with synthetic wastewater with simple orgnaic composition, and the organic materials in the treated wastewater was analyzed in detail.In the former part of the study, trace organic materials in the effluent were analyzed. Organic materials in the treated wastewater was extracted with dichloromethane, concentrated, and directly analyzed by gas chromatography/mass spectrometry. Fourtyeight organic materials were identified. While most part of the compounds were identified as aliphatic fatty acids, aromatic compounds were also found. The organic material detected changed significantly even for the same reactor if the sampling date was different.In the latter part of the study, the behavior of protein and carbohydrates in the treated wastewater was investigated. Protein and carbohydrates explained almost 70% of the organic materials in treated wastewater. It was estimated that about half of organic materials in treated wastewater in actual wastewater treatment plant is coming from activated sludge. The fluctuation of effluent dissolved organic carbon had high correlation with carbohydrates, but not with protein.

虽然废水生物处理对去除废水中的有机污染物非常有效，但处理后的废水中仍存在痕量有机物。如果一个水体的来源主要是经过处理的废水，那么在人口密集的流域，微量有机物质会影响水环境。虽然处理过的废水中有机物质的来源部分归因于进水废水中难以生物降解的物质，但用于废水处理的微生物可能是处理过的废水中有机物质的来源。因此，在本研究中，我们研究了活性污泥中微生物对处理后废水中有机物质的贡献。对有机成分简单的合成废水进行了活性污泥法处理，并对处理后的废水中的有机物进行了详细分析。在前一部分的研究中，对出水中的微量有机物进行了分析。用二氯甲烷萃取处理废水中的有机物，进行浓缩，用气相色谱/质谱法直接分析。鉴定出48种有机物质。虽然大部分化合物被鉴定为脂肪族脂肪酸，但也发现了芳香族化合物。即使在同一反应器中，如果采样日期不同，所检测到的有机物质也会发生显著变化。在研究的后半部分，研究了处理后的废水中蛋白质和碳水化合物的行为。蛋白质和碳水化合物解释了处理废水中近70%的有机物质。据估计，实际污水处理厂处理后的废水中约有一半的有机物来自活性污泥。出水溶解有机碳的波动与碳水化合物有较高的相关性，而与蛋白质无相关性。