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首页> 外文会议>Sino-Japan Geotechnical Symposium November; 20071104-07; Chongqing(CN) >FLOCCULATION AND DEHYDRATION CONTROL DURING SOIL WASHING PROCESS USING SOIL PLASTICITY INDEX AND pH
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FLOCCULATION AND DEHYDRATION CONTROL DURING SOIL WASHING PROCESS USING SOIL PLASTICITY INDEX AND pH

机译：利用土壤可塑性指数和pH值进行土壤洗涤过程中的絮凝和脱水控制

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摘要

Soil washing is physical-chemical separation for removing the portion of the soil that is most polluted mainly by screen, hydrocyclone, and flotation. This reduces the amount of soil needing further cleanup. In most cases, the contaminants, such as fuels and heavy metals, reside and concentrated in fine-grained soils. The overflow from the hydrocyclone, consisting of fines and water, is treated and converted to a 45%-55% dry solids sludge cake by flocculants addition, sedimentation, thickening, and dewatering.This sludge cake contains the target contaminants and therefore must be managed by disposal at a properly permitted off-site disposal facility. The fines treatment is very important for the recovery of water and for making the sludge cake as dry as possible, in order to create an economical and efficient soil washing system. The proper selection of type and dosage of flocculants is crucial to the success of the fine treatment. This paper describes and proposes a new theory to determine the optimum dosage of flocculants (polymers) based on the soil plasticity index and the pH value. This theory concerning the optimum dosage was verified by subsequent data in the soil washing plant.
机译：土壤洗涤是一种物理化学分离，用于去除主要由筛网，水力旋流器和浮选污染最严重的土壤部分。这减少了需要进一步清理的土壤量。在大多数情况下，污染物（例如燃料和重金属）会驻留并聚集在细颗粒的土壤中。水力旋流器的溢出物（包括细粉和水）经过处理并通过添加絮凝剂，沉降，增稠和脱水将其转化为45％-55％的干燥固体污泥饼，该污泥饼包含目标污染物，因此必须进行处理通过在适当许可的场外处置设施处置。细粉处理对于水的回收和使污泥饼尽可能干燥非常重要，以建立经济有效的土壤洗涤系统。絮凝剂类型和剂量的正确选择对于精细处理的成功至关重要。本文描述并提出了一种新理论，可根据土壤可塑性指数和pH值确定絮凝剂（聚合物）的最佳用量。有关最佳剂量的理论已通过土壤洗涤工厂的后续数据得到了证实。

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