In view of the disadvantages of IC reactor that the quantity of the circulation during the period of start-up was small,and the sludge was hard to be granulated,an experimental facility of additional gas IC reactor with forced circulation system was used to treat high concentration organic wastewater,and a contrast experiment between it and common IC reactor was also carried out at the same time.The results showed that,compared with the common IC reactor,the start-up period of additional gas IC reactor was shorten by 20%...