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首页> 外文期刊>Geotechnical testing journal >Alternatives for the Detection of Residual Polyacrylamide in Geotextile Tube Dewatering-Streaming Current Detection and China Clay Settling Rate Methods
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Alternatives for the Detection of Residual Polyacrylamide in Geotextile Tube Dewatering-Streaming Current Detection and China Clay Settling Rate Methods

机译：土工布管脱水流电流检测中残留聚丙烯酰胺的检测方法和中国黏土沉降速率方法

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摘要

The use of polyacrylamide (PAM)-based flocculants has become an essential component of most geotextile tube dewatering projects. Although knowledge of the residual flocculant concentration in geotextile tube supernatant and effluent is essential to the safe use of PAM-based flocculants, residual flocculant concentration is not commonly measured in geotextile tube dewatering operations. Furthermore, there is no ASTM standard test method for measuring residual flocculant concentrations in water. This paper presents a comparative study of two different methods that are commonly used to measure residual flocculant concentrations in water: the Streaming Current Detection (SCD) method and the China Clay Settling Rate (CCSR) method, to evaluate their applicability to the geotextile tube industry. The comparison is based on an analysis of measured residual PAM concentrations obtained for five different cationic PAM polymers used to flocculate Tully fines soil. Optimum flocculant doses for the Tully fines soil were determined using the jar test (ASTM D2035-08) for three different solids concentrations by mass (5, 15, and 33 %). The SCD and CCSR methods were performed on the supernatants of Tully fines that were conditioned at their optimum doses and at concentrations 50 % above their optimum dose. Laboratory test results showed that both the SCD and CCSR methods produced similar residual PAM concentration results for the polymer/soil combinations tested. The SCD method, however, produced more consistent and repeatable results in comparison to the CCSR method. The SCD method was also easier to use and could be performed in shorter amounts of time than the CCSR method. Based on the results, it is recommended that the SCD method be standardized and used to measure residual PAM-based flocculant concentrations in geotextile tube supernatant and effluent.
机译：基于聚丙烯酰胺（PAM）的絮凝剂的使用已成为大多数土工布管脱水项目的重要组成部分。尽管了解土工布管上清液和流出物中残留的絮凝剂浓度对于安全使用基于PAM的絮凝剂至关重要，但是在土工布管脱水操作中通常无法测量残留的絮凝剂浓度。此外，还没有用于测量水中残留絮凝剂浓度的ASTM标准测试方法。本文介绍了两种通常用于测量水中残留絮凝剂浓度的不同方法的比较研究：流动电流检测（SCD）方法和中国黏土沉降速率（CCSR）方法，以评估其在土工布管行业中的适用性。 。比较是基于对用于絮凝塔利细粉土壤的五种不同阳离子PAM聚合物获得的残留PAM浓度的分析结果。使用jar测试（ASTM D2035-08），针对三种不同的固体质量浓度（5％，15％和33％），确定了Tully细粉土的最佳絮凝剂剂量。 SCD和CCSR方法是对Tully细粉的上清液进行的，这些上清液以最佳剂量和高于最佳剂量50％的浓度调节。实验室测试结果表明，对于所测试的聚合物/土壤组合，SCD和CCSR方法均产生了相似的残留PAM浓度结果。但是，与CCSR方法相比，SCD方法产生了更加一致和可重复的结果。与CCSR方法相比，SCD方法更易于使用，并且执行时间更短。根据结果​​，建议将SCD方法标准化并用于测量土工布上清液和流出物中残留的基于PAM的絮凝剂浓度。

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