过硫酸盐修复有机污染场地建筑物腐蚀性研究

Building Corrosion Evaluation for Persulfate Remediating Organic Contaminated Site

研究了过硫酸盐修复有机污染场地后残留的硫酸根、土壤酸碱性和氧化还原电位对建筑物混凝土结构和钢结构的腐蚀性。在过硫酸钠完全反应且不计原土壤中硫酸盐的条件下,加入过硫酸钠0. 5～4. 0g/(100g土)时,土壤中残留硫酸根对混凝土结构有中、强腐蚀性。当使用氧化钙活化过硫酸钠,n(过硫酸钠):n(氧化钙)≥2:1时,土壤酸碱性对建筑物混凝土结构和钢结构均有强腐蚀性;当n(过硫酸钠):n (氧化钙)≤1:1时,为微腐蚀。土壤中残留的过硫酸盐对建筑物钢结构具有腐蚀性。

Study on the corrosion of concrete and steel structure by sulfate ions, soil pH and Oxidation-reduction potential due to persulfate remediating organic contaminated site. Under the condition that persulfate fully reflect and ignore the sulfate in soil, the sulfate ions have medium or strong corrosive to concrete structure under the condition that 0.5~4.0g persulfate/（100g soil）. Persulfate activated by calcium oxide, soil pH have strong corrosive to concrete and steel structure, under condition n （Na 2S 2O 8） ： n （CaO） ≥2：1. It showed up slight corrosive, when n （Na 2S 2O 8） ： n （CaO） ≤1：1. The residual sulfates in soil will do corrosion to steel structure.