Centre for Water Management and Reuse, Natural and Built Environments University of South Australia, SA 5095, Australia.
Centre for Water Management and Reuse, Natural and Built Environments University of South Australia, SA 5095, Australia; Australian Water Quality Centre, South Australian Water Corporation, SA 5000, Australia; State Key Laboratory for Environmental Aquatic Chemistry, Research Centre for Eco-Environmental Sciences, Beijing 100085, China.
J Environ Sci (China). 2014 Oct 1;26(10):1985-93. doi: 10.1016/j.jes.2014.08.001. Epub 2014 Aug 10.
The treatment of organics present in the lower reaches of a major river system (the Murray-Darling Basin, Australia) before (March-July 2010), during (December 2010-May 2011) and after (April-December 2012) a major flood period was investigated. The flood period (over 6months) occurred during an intense La Niña cycle, leading to rapid and high increases in river flows and organic loads in the river water. Dissolved organic carbon (DOC) increased (2-3 times) to high concentrations (up to 16mg/L) and was found to correlate with river flow rates. The treatability of organics was studied using conventional jar tests with alum and an enhanced coagulation model (mEnCo©). Predicted mean alum dose rates (per mg DOC) were higher before (9.1mg alum/mg DOC) and after (8.5mg alum/mg DOC) than during the flood event (8.0mg alum/mg DOC), indicating differences in the character of the organics in raw waters. To assess the character of natural organic matter present in raw and treated waters, high performance size exclusion chromatography with UV and fluorescence detectors were used. During the flood period, high molecular weight UV absorbing compounds (>2kDa) were mostly detected in waters collected, but were not evident in waters collected before and afterwards. The relative abundances of humic-like and protein-like compounds during and following the flood period were also investigated and found to be of a higher molecular weight during the flood period. The treatability of the organics was found to vary over the three climate conditions investigated.
调查了主要河流系统（澳大利亚墨累-达令盆地）下游在一次大洪水期间（2010 年 3 月至 7 月）、期间（2010 年 12 月至 2011 年 5 月）和之后（2012 年 4 月至 12 月）存在的有机物的处理情况。洪水期（超过 6 个月）发生在强烈的拉尼娜周期期间，导致河流水流量和有机负荷迅速和高度增加。溶解有机碳（DOC）增加（2-3 倍）至高浓度（高达 16mg/L），并发现与河流流量相关。使用常规 jar 试验和增强混凝模型（mEnCo©）研究有机物的可处理性。预测的平均明矾剂量率（每毫克 DOC）在洪水事件之前（9.1mg 明矾/毫克 DOC）和之后（8.5mg 明矾/毫克 DOC）都高于期间（8.0mg 明矾/毫克 DOC），表明原水中有机物的性质存在差异。为了评估原水和处理水中天然有机物的性质，使用带有 UV 和荧光检测器的高性能尺寸排除色谱法进行了评估。在洪水期间，主要检测到在采集的水中存在高分子量的紫外吸收化合物（>2kDa），但在洪水之前和之后采集的水中则没有。洪水期间和之后还研究了腐殖质样和蛋白质样化合物的相对丰度，发现它们在洪水期间具有更高的分子量。有机物的可处理性在调查的三种气候条件下有所不同。
