Soil　from　a　former　chemical　plant　was　found　to　be　contaminated　with　organochlorine　compounds　(OCs)　from　aged　pesticide　residues　and　underwent　surfactant-enhanced　electrokinetic　remediation　(EKR).　Tween　80　(TW80)　and　N,N-Dicarboxymethyl　glutamic　acid　tetrasodium　(GLDA)　were　used　to　increase　the　availability　of　OCs　and　to　enhance　oxidation　efficiency　in　the　soil　under　EKR.　The　results　indicate　that　flushing　soil　with　TW80　increased　the　removal　of　persistent　OCs　from　the　soil,　with　40%–80%　removal　efficiency.　Further,　incorporating　TW80　with　sodium　persulfate　significantly　advanced　oxidation　and　removed　60%–82%　of　OCs　(in　both　absence　and　presence　of　the　nZVI　reactive　barrier)　within　10　days.　Compared　to　control　treatment,　the　addition　of　TW80　improved　EKR　by　20%–30%.　The　improvement　was　attributed　to　the　ability　of　TW80　to　solubilize　hardly-soluble　compounds　and　to　sustain　the　activation　of　persulfate　ions　(S2O82−)　by　dissolving　metal　ions　in　the　soil　that　would　stimulate　the　production　of　sulfate　radicals　(SO4•−)　and　thus　the　degradation　of　pollutants　(in　the　absence　of　nZVI　reactive　barrier).　Differing　from　TW80,　GLDA＇s　capacity　to　solubilize　and　extract　OCs　from　the　soil　was　much　lower　and　less　reliable,　averaging　around　10%　compared　to　60%　OC-removal　for　TW80.　However,　in　the　absence　of　oxidant　activators　from　an　external　source,　GLDA　was　important　for　sustaining　the　Fenton　reaction.　Its　inclusion　increased　pollutant　removal　from　an　average　of　50%–60%.　The　addition　of　the　nZVI　reactive　barrier　did　not　significantly　improve　remediation　within　7　days.　These　findings　suggest　that　TW80　combined　with　EKR　and　advanced　oxidation　in　the　presence　of　the　nZVI　reactive　barrier　is　the　best　in　situ　approach　to　remediate　soils　contaminated　with　OCs　from　chemical　waste　of　industrial　processes.　©　2019