Reduced iron powder is used to treat groundwater contaminated with nitrate

Use lively metal reduction method, with low price, sources of reduced iron powder as metal reducing agent on nitrate nitrogen pollution repair became the ideal processing by nitrate pollution of groundwater material chemical remediation technology is mainly using reductant nitrate nitrogen reduction, depending on the reducing agent can be divided into active metal reduction method and catalytic reduction method, the former is aluminum, zinc and other metal elemental iron as the reducing agent, which is a hydrogen gas such as methanol and formic acid as reducing agent, catalyst is generally must exist to make reaction.

As early as the 1990s, reduced iron powder was successfully used in groundwater remediation, and nitrate reduction by iron powder is a high-energy reaction, which has been known for a long time. However, few studies on this aspect have been conducted since the late 1990s, when people gradually became interested in nitrate reduction by iron powder.

In general, reducing iron powder is an alternative reducing agent with a wide range of sources, relatively low price and fast REDOX speed. The disadvantage is that this method cannot completely reduce nitrate into N2. After the reaction, there is more ammonia nitrogen in the water, which needs subsequent treatment, and the Ph value needs to be strictly controlled during the reaction.