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首页> 外文期刊>Soil Science Society of America Journal >Soil Factors Influencing Suspended Sediment Flocculation by Polyacrylamide
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Soil Factors Influencing Suspended Sediment Flocculation by Polyacrylamide

机译:影响聚丙烯酰胺悬浮泥沙絮凝的土壤因素

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摘要

Turbidity in stormwater runoff may be treated with polyacrylamide (PAM) to flocculate suspended sediment, but the relationships between PAM properties and those of the suspended sediment have not been widely studied. Our objective was to determine how soil physical and chemical properties affected flocculation by PAMs with a variety of characteristics. Subsoil materials were collected from 13 active construction sites around North Carolina. These were tested for flocculation using PAMs with charge densities of 0 to 50% and molecular weights of 14 to 28 Mg mol–1, at concentrations of 0.025 to 10 mg L–1. Soil was added to solutions of single and mixed PAMs with various molecular weights and charge densities and the turbidity was measured 30 s after mixing. Five kaolinitic subsoils had linear responses to PAM regardless of molecular weight or charge density, with an optimal dose of 1 to 2 mg L–1 to obtain >96% reduction in turbidity. Increased turbidity, indicating stabilization, occurred for two additional soils with anionic PAM concentrations 20%) in suboils from the Coastal Plain reduced the effectiveness of single, anionic PAMs for flocculation. The mixed anionic PAM, however, reduced turbidity in most subsoils and did not have a stabilization reaction at higher concentrations (1–5 mg L–1). Texture, mineralogy, and extractable Fe were highly correlated with reductions in turbidity with PAM, but most of the differences in flocculation occurred in subsoils with 20% or more smectite or vermiculite.
机译:可以使用聚丙烯酰胺 (PAM)处理雨水径流中的浊度,以使悬浮的沉积物絮凝,但PAM性质与悬浮的沉积物之间的关系 未被广泛研究。我们的目标是确定具有各种特征的PAM如何 土壤理化性质如何影响絮凝 。从North Carolina附近的13个活跃的建筑工地收集了地下土壤 。使用浓度为0至50%的 且分子量为14至 28 Mg mol –1 的PAM对它们进行了絮凝测试。将0.025到10 mg L –1 土壤添加到具有各种 分子量,电荷密度和浊度的单一和混合PAM溶液中混合后30秒测量 。五个高岭土底物对PAM均具有线性 响应,而与分子量或电荷密度无关, 的最佳剂量为1至2 mg L –1 至使浊度降低> 96% 。两种另外的具有阴离子PAM浓度 ,但中性或混合阴离子的土壤的浊度增加,表明稳定在这些浓度下,PAM产品 降低了浊度。其余六种 底油的响应方式差异很大,包括任何单一阴离子PAM的 浊度几乎没有降低。 蒙皂石和ver石含量的增加(沿海平原的 底油中的> 20%)降低了单个 阴离子型PAM絮凝的有效性。但是,混合阴离子PAM 在大多数底土中均降低了浊度,并且在较高浓度下(1-5 mg L -1 >)。 质地,矿物学和可提取铁与PAM浊度的降低高度相关 ,但絮凝的大多数差异 发生在含有20%或更多蒙脱石 或ver石的地基。

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