黑臭河道生物修复中3种不同增氧方式比较研究

利用叶轮式曝气机、水下式曝气机、射流式曝气机等3种不同曝气方式的曝气设备进行了黑臭河涌曝气试验。研究表明，不同增氧方式对黑臭河道水体增氧效率不同，水下式曝气机、叶轮式曝气机均可在黑臭河道下游形成一段绿色水而，水车式曝气机下游变绿河段长度为15．7m，叶轮式曝气机下游变绿河段长度为6．3m，射流式曝气机不能形成明显的绿色水而。无论足河道水体增氧效果、CODcr、NH3-N去除效果，还足河道菌-藻生态系统的建口、自净能力的肩动，水下式增氧机均优于其它两种增氧机，而且存在投资少、安装维护方便、运行费用低等优点。适应于河道窄、水流缓、截污难度大的城郊中小型黑臭河道的治理。

Investigation on three aerator equipments in the bioremediation of black -odor river

The aeration experiment of black-odor river was conducted by the use of three aerator equipments, such as paddlewheel aerator, impeller aerator and injector aerator. The results showed that the aeration efficiency among these aerator equipments was dif-ferent, and green surface of water was observed in the downriver area when paddlewheel aerator or impeller aerator was applied. The length of the green river for paddlewheel aerator and impeller aerator was 15.7 m and 6.3 m, respectively. However, no green water was found in the black-odor river treated by injector aerator. More advantages of paddlewheel aerator than the other two aerator equipments were demonstrated in the paper by the analysis of the following parameters: aeration efficiency, the reduction rate of CODcr and NH3-N, the establishment of ecosystem involving bacteria and alga, as well as self-purification startup. Moreover, less investment, more con-venient for the installation and maintenance, together with lower cost can be expected when the paddlewheel aerator was utilized. Pad-dlewheel aerator is suitable for the treatment of suburban black-odor river which has narrow river channel, slow stream and difficulty to collect its contaminants.