Method for remediating groundwater organic contamination by in-situ reaction zone

A method for remediating groundwater chlorophenols organic contamination, comprising the following steps of:

• step S1. determining a location of a contamination source;
• step S2. setting up an injection well in upstream in a flowing direction of the groundwater of the contamination source;
• and
• step S3. degrading chlorophenols organic contamination in groundwater in the to-be-remediated region by injecting a remediation reagent into groundwater in a to-be-remediated region through the injection well;
• wherein,
• the step S3 comprises:
• detecting a flow rate of the groundwater in the to-be-remediated region,
• when the flow rate is greater than 4 m/d, the remediation reagent comprises sulfidated nanoscale zero-valent iron and hydrogen peroxide, wherein an iron-sulfur ratio in the sulfidated nanoscale zero-valent iron is 15;
• and
• when the flow rate is smaller than or equal to 4 m/d, the remediation reagent comprises sulfidated nanoscale zero-valent iron modified by sodium carboxymethylcellulose and hydrogen peroxide, wherein the sodium carboxymethylcellulose in the sulfidated nanoscale zero-valent iron modified by sodium carboxymethylcellulose is used at a concentration of 1.0 g·L−1.