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首页> 外文期刊>Environmental toxicology and chemistry >Assessing the Impacts of Land Spreading Water-Treatment Residuals on the Anecic Earthworm Lumbricus terrestris, Soil Microbial Activity, and Porewater Chemistry
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Assessing the Impacts of Land Spreading Water-Treatment Residuals on the Anecic Earthworm Lumbricus terrestris, Soil Microbial Activity, and Porewater Chemistry

机译：评估土地蔓延水处理残留对生物蚯蚓株式会膜，土壤微生物活性和沉降水化学的影响

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Water-treatment residuals (WTRs), by-products of drinking water clarification, are increasingly recycled to land to promote circular economy and reduce disposal costs, yet there is a lack of published literature on their effects on soil ecology. In the present study, the effects of WTRs on earthworm growth, soil respiration, and soil porewater chemistry were investigated throughout a 7-wk outdoor mesocosm trial. We derived WTRs from both aluminum and iron coagulants and applied them to a loam soil at 0 to 20% (w/w). In addition, soil from a field that had received long-term WTR applications and that of an adjacent nontreated reference field were included in the study. Earthworm mass increase was significantly higher in all but one laboratory-treated soil when compared to the control. Furthermore, a linear regression model was used to predict increases in weekly soil respiration based on the application rates of both Al and Fe WTRs. In addition, a significant increase in soil respiration was observed from the treated farm soils during the first 4 wk of the trial. Measured sodium, magnesium, potassium, and iron porewater concentrations were higher in the treated farm soils than the reference site soil in a majority of samples, although these differences may be related to land management. Laboratory-treated soils had elevated porewater arsenic concentrations (e.g., similar to 17 mu g L-1 in controls vs similar to 62 mu g L-1 in the 20% w/w Al WTR treatment in week 1), whereas porewater nickel concentrations were, respectively, elevated and lowered in Al WTR- and Fe WTR-amended samples. Overall, observed disturbances to soil ecology were determined to be minimal. Environ Toxicol Chem 2021;00:1-9. (c) 2021 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC.
机译：水处理残留物（WTRS），副产物饮用水澄清，正越来越多地回收利用土地，促进循环经济，降低处置成本，但没有对他们的土壤生态效应的缺乏公开发表的文献。在本研究中，对蚯蚓生长，土壤呼吸，土壤孔隙水化学WTRS的影响，在整个7周的户外围隔实验进行了调查。我们衍生自铝和铁混凝剂WTRS，并将它们施加到壤土在0至20％（重量/重量）。另外，从已接受长期WTR应用字段和一个相邻的未处理的参考场的土壤被包括在研究中。与对照相比，当蚯蚓大量增长，但在所有实验室一个，处理过的土壤显著较高。此外，一元线性回归模型，用于预测基于两个铝和铁WTRS的应用率在每周的土壤呼吸的增加。另外，从处理过的土壤农场第一4周试验期间观察到的在土壤呼吸一个显著增加。测量钠，镁，钾和铁孔隙水浓度分别为在处理过的土壤农场比在大多数样品的参考部位土壤更高，尽管这些差异可能与土地管理。实验室处理的土壤具有升高的孔隙水的砷浓度（例如，类似于17亩克L-1中的控制VS类似于62亩克L-1中的20％w / w的在1周内的Al WTR处理），而孔隙水镍浓度被分别升高和以Al WTR-和Fe WTR-修正样品降低。总体而言，观察扰动土壤生态被确定为最小。环境毒素化学2021; 00：1-9。 （c）提交人2021年。 Wiley期刊LLC代表Setac的环境毒理学和化学。

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