文献类型：期刊文献

英文题名：A bench-scale assessment for phosphorus release control of sediment by an oxygen-releasing compound (ORC)

作者：Yang, Jie[1];Lin, Feng K.[1];Yang, Lei[2];Hua, Dan Y.[1]

机构：[1]ECUST, Sch Resource & Environm Engn, Shanghai 200237, Peoples R China;[2]ECUST, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2015

卷号：50

期号：1

起止页码：49

外文期刊名：JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING

收录：;EI(收录号：20145000312241);WOS:【SCI-EXPANDED(收录号:WOS:000345503800006)】；

基金：This research was funded by the Social Development Program of Science and Technology Commission of Shanghai Municipality, China, under Grant No. 062312021 is gratefully acknowledged.

语种：英文

外文关键词：phosphorus fraction; oxygen-releasing compound; phosphorus release control; temporal and spatial distribution; Microbial activity

摘要：The effects of oxygen-releasing compound (ORC) on the control of phosphorus (P) release as well as the spatial and temporal distribution of P fractions in sediment were studied through a bench-scale test. An ORC with an extended oxygen-releasing capacity was prepared. The results of the oxygen-releasing test showed that the ORC provided a prolonged period of oxygen release with a highly effective oxygen content of 60.6% when compared with powdery CaO2. In the bench-scale test, an ORC dose of 180g center dot m(-2) provided a higher inhibition efficiency for P release within 50days. With the application of the ORC, the dissolved oxygen (DO) concentration and redox potential (ORP) of the overlying water were notably improved, and the dissolved total phosphorus (DTP) was maintained below 0.689mg center dot L-1 compared to 2.906mg center dot L-1 without the ORC treatment. According to the P fractions distribution, the summation of all detectable P fractions in each sediment layer exhibited an enhanced accumulation tendency with the application of ORC. Higher phosphorus retention efficiencies were observed in the second and third layers of sediment from days 10 to 20 with the ORC. Phosphorus was trapped mainly in the form of iron bound P (Fe-P) and organically bound P (O-P) in sediment with the ORC, whereas the effects of the ORC on exchangeable P (EX-P), apatite-associated P (A-P) and detrital P (De-P) in the sediment sample were not significant. The microbial activities of the sediment samples demonstrated that both the dehydrogenase activity (DHA) and alkaline phosphatase activity (APA) in the upper sediment layer increased with the ORC treatment, which indicated that the mineralization of P was accelerated and the microbial biomass was increased. As the accumulation of P suppressed the release of P, the sediment exhibited an increased P retention efficiency with the application of the ORC.