In order to improve the environment, eight aeration equipments were placed in Qing River with each
power of 11.025 KW during Beijing Asian Games as early as 1990, which made the level of dissolved
oxygen rose from 0 to 6mg/L, and the removal rate of BOD5 also reached 60%. This process almost
eliminated all odors in the river. Shanghai Academy of Environmental Sciences set some aeration points
in the river channel to conduct the experiment of water aeration and bioremediation. In this experiment,
the dissolved oxygen level of the water body which was in anaerobic condition originally increased
significantly, and the growth of the indigenous aerobic microorganisms was stimulated greatly, and the
removal rate of organic pollutants in water was up to 10.7% ~ 23%. The concentration of BOD5 and
NH4+-N decreased by 2.492mg/L, 1.217 mg/L and 0.322 mg/L after aeration in the Guancheng
downstream section of the Dongguan Canal. Wang Chengxin and his group conducted a pilot study on
aeration in Shanghai Suzhou River by using BIO method. The results showed that the pure oxygen
aeration could reduce the COD
cr of the black-odor water and the removal rate could reach from 19.5% to
56% [4].