原位化学氧化高压注射修复优化设计与应用案例分析

A CASE STUDY ON DESIGN AND APPLICATION OF IN-SITU CHEMICAL OXIDATION HIGH PRESSURE INJECTION REMEDIATION

在国内有机污染场地修复中,原位化学氧化高压注射已经广泛应用。依托某化工厂土壤修复工程中典型修复地块A-1,现场试验确定典型地层的原位注射药剂扩散半径、单孔最大注浆量。根据加密补充调查、土壤数据分析,按空间分布划分为3个浓度主分区及6个浓度亚分区。通过小试确定3个浓度主分区的投加比,设计各分区的单孔注浆量、氧化剂配制浓度及配方等参数,实现各分区修复药剂投加比的优化。设计中不同深度的不同注浆量,在施工中通过注射过程调整高压注射钻杆的提升速度来实现。最终3个浓度主分区土壤污染物均达到修复目标值。此原位化学氧化高压注射设计方法可在确保修复达标的前提下,达到优化修复地块药剂投加比参数的目的。

In-situ chemical oxidation high pressure injection method has been widely used in the remediation of the organic contaminated sites in China. Based on the typical remediation plot A-1 in a soil remediation project,the field test was conducted to determine the diffusion radius of the injection agents and the maximum amount of grouting in one single hole.According to the data of density-increased supplementary investigation,soil were divided into three main concentration zones and six sub-concentration zones by spatial distribution. The concentration of the main concentration zones dosing ratio,the designed amount of single-hole grouting for each zone,the formula of oxidants mixture were determined based on the result of the test in order to realize the optimization of drug dosing ratio in each concentration zone. Therefore,fast adjustment of high pressure injection pipe in real projection could be realized. Finally,the concentration of soil contaminants in the three main concentrations reached the target value. The design method of in-situ chemical oxidation high pressure injection can optimize the dosage parameters of the remediation plot on premise of ensuring the standard of remediation effect.