Shanableh A, Jomaa S
Department of Civil Engineering, University of Sharjah, United Arab Emirates.
Water Sci Technol. 2001;44(10):129-35.
The production of useful organic matter from sludge expands the potential for utilizing the product as a resource. This paper is focused on the accumulation and removal of volatile fatty acids (VFAs) produced from primary, secondary and a mixture of both sludges using hydrothermal treatment with and without the use of oxidants. The results confirmed that the maximum accumulation of VFAs was achieved at moderate hydrothermal treatment temperatures below 200 degrees C, and was dependent on the composition of sludge and the amount of oxidant used for treatment. The maximum accumulation reached 0.26-0.36 mg VFAs as COD per mg VS from the three sludge types. Acetic acid dominated the VFAs and was followed by propionic acid, with the other VFAs accounting for less than 5% of the total VFAs. As hydrothermal treatment progressed in terms of COD removal, the contribution of acetic acid to the total VFAs increased while the contributions of the other VFAs decreased. The VFAs constituted a major component of the accumulated dissolved organic matter, which reached a maximum of 0.5-0.7 mg soluble COD per mg VS from the three sludge types.
从污泥中生产有用的有机物质扩大了将该产品用作资源的潜力。本文重点研究了在有氧化剂和无氧化剂的情况下，利用水热处理从初级污泥、二级污泥以及两者的混合物中积累和去除挥发性脂肪酸（VFAs）。结果证实，在低于200摄氏度的适度水热处理温度下，VFAs实现了最大积累，且这取决于污泥的组成和用于处理的氧化剂的量。从三种污泥类型中获得的最大积累量达到每毫克挥发性固体0.26 - 0.36毫克以化学需氧量计的VFAs。乙酸在VFAs中占主导地位，其次是丙酸，其他VFAs占总VFAs的比例不到5%。随着水热处理在化学需氧量去除方面的进展，乙酸对总VFAs的贡献增加，而其他VFAs的贡献减少。VFAs构成了积累的溶解有机物的主要成分，从三种污泥类型中获得的最大量达到每毫克挥发性固体0.5 - 0.7毫克可溶性化学需氧量。
