浅水湖泊升流循环复氧装置的研制与性能

Development and performance of flowing-cycle reoxygenation devices for shallow lake

本研究为浅水型湖泊'黑水团'暴发后的应急复氧研制出三套升流循环复氧装置。三种装置均采用气弹释放循环复氧流复氧,分别为Ⅰ封闭曝气型、Ⅱ敞口曝气型、Ⅲ敞填料曝气型装置。小试结果显示Klas指标Ⅲ型比Ⅰ型、Ⅱ型分别高出179%、51%;Qc指标Ⅲ型比Ⅰ型、Ⅱ型分别高出167%、50%;ε指标Ⅲ型比Ⅰ型、Ⅱ型分别高出176%、51%;Ⅲ型装置功率因子E比Ⅰ型、Ⅱ型分别高出29%、50%。中试于太湖边沉藻池中采用模拟'黑水团'的沉藻池水进行实验,中试型Ⅲ型多面球形填料装置可使水深1.8 m,面积200 m2模拟黑臭水体边缘溶氧28 h内恢复到1.69 mg·L-1,供氧效率达到26%,并对水中CODCr、氨氮等的降解具有良好的作用。该设备初步证明可用于类似太湖黑臭团暴发时水体的应急治理领域。

Three kinds of flowing-cycle reoxygenation devices for emergency reoxygenation to deal with outbreak of “black water group”of shallow lake were developed. The principle of the devices was aeroelastic enhancing circulation flow. The three devices were type Ⅰ of closed aeration, type Ⅱ of exposure aeration, type Ⅲ of exposure packing aeration. Klas indicators of small test showed that type Ⅲ was higher than typeⅠ and type Ⅱby 179% and 51% respectively; Qc of type Ⅲ was higher than type Ⅰ and type Ⅱ by 167% and 50%respectively;εof type Ⅲ was higher than type I and type Ⅱ by 176%and 51%respectively;E of type Ⅲ was higher than type I and type Ⅱ by 29%and 50%respectively. In pilot scale test dead algae water was mixed with lake water to simulate the“black water group”in a blue algae settling pond of Taihu lake whose depth was 1.8 m and area was 200 m2, and in this test the pilot type Ⅲ multi-faceted spherical packing device could restore dissolved oxygen from 0 mg·L-1 to 1.69 mg·L-1 in 28 h, the device oxygen efficiency was 26%, and the degradation of water CODCr, ammonia nitrogen was satisfactory. The device could be used for emergency management of black water group outbreak such as in Taihu lake.