To explore the environmental durability of heavy metal contaminated soil remediated by enzyme induced carbonate precipitation (EICP) technology

acid soaking

freeze-thaw tests

and rainfall tests were carried out on the zinc and lead contaminated soil after EICP remediation

respectively. The durability and influence of the zinc and lead contaminated soil remediated by EICP technique under different environmental conditions and the corresponding influence regularity were discussed in this paper. The results showed that under different concentrations and types of acid solutions

the leaching amount of heavy metal ions in exchangeable and carbonate bound forms in the zinc and lead contaminated soil after EICP remediation decreased with pH value

with the content of ions in carbonate bound forms decreasing and the content of ions in exchangeable forms gradually increasing. It was also found that the stability in sulfuric acid solution was greater than that in nitric acid solution. As the number of freeze-thaw cycles increased

the leaching amount of exchangeable ions in the zinc and lead contaminated soil remediated by EICP technique increased

while the content of ions in the carbonate bound form reduced. Under the condition of heavy rain

Zn and Pb were mainly released within the first 20 minutes and migrated from top to bottom. All the results demonstrate that the heavy metal contaminated soil remediated by EICP technology has a good durability under acid soaking

freeze-thaw cycles

and heavy rain.