Abstract: An experimnet was carried out using mixture of iron filings,furnace slag and river sand to dechlorinate simulated 2,4-DCP-contaminated wastewater,with a view to exploring its affecting factors,like particle-size and rate of iron filings,ration of iron filings to furnace slag,pH,etc.,and its reaction mechanism.Results show that all the above-listed factors had significant effects on dechlorination.The Fe⁰ system could remove as much as 97% of the contaminant when its iron filings was 2-5 mm in particle size,pH of the wastewater remained unchanged,and the ration of iron filings to furnace slge was 31:9.After dechlorination 2,4-DCP in the wastewater was turened mainly into 2-CP,4-CP and phenol,leaving the water be much improved in biodegradability for further treatment.

Key words: zero-valent iron, slag, 2,4-dichlorophennol, dechlorination