various measures to strengthen the technology effect. On the other hand, the ex-situ bioremediation was
that the polluted water was taken out from the contaminated areas to be treated after transportation.
Therefore, as engineering technology for river pollution controlling, the bioremediation was advanced
rapidly from 1990. There are many advantages for the bioremediation technology, such as reduced cost,
low environmental influence, no secondary pollution or pollutant movement, reducing pollutant
concentration by the maximum extent, available for the sites where regular pollution treatment
technology is difficult to be applied, and so on. The bioremediation technology is the most promising
remediation.