BAC滤池水生生物泄漏风险高效控制研究

Efficient Control of Leakage Risk of Aquatic Organisms in BAC Filter

为实现对BAC滤池水生生物泄漏风险的高效控制，以优势种群之一猛水蚤为对象，提出以增设砂垫层和优化氧化剂投加方式为核心的BAC滤池水生生物截留灭活技术，并探讨了该技术的作用机理。中试结果表明：氧化剂促进了砂垫层对猛水蚤的拦截，砂垫层拦截则通过延长接触时间强化了氧化剂的灭活效果。当砂垫层厚度为30cm、C10，投加量为0．2mg／L时，在6—12m／h滤速范围内，对猛水蚤的灭活率稳定在97．94％以上。该截留灭活技术在砂垫层中完成对猛水蚤的截留灭活，避免了对活性炭层正常运行的干扰，同时实现了对猛水蚤泄漏风险的完全控制。

To realize the efficient control of leakage risk of aquatic organisms in BAC filter, a novel technology characterized by adding sand layer and optimizing oxidant dosing method was proposed to solve the leakage risk of Harpacticoida, which is one of the main aquatic organisms in BAC filter. The mechanism of such technology was discussed and then the pilot scale test was carried out to investigate the application effect. The results showed that oxidant could promote the interception effect of sand layer on Harpacticoida and the interception effect strengthened the inactivation effect of the oxidant on Harpacticoida by prolonging the inactivation contact time. Under the conditions of sand layer thickness of 30 cm, C102 dosage of 0.2 mg/L and filtration rate of 6 to 12 m/h, the inactivation efficiency of Harpacticoida was stable at above 97.94%. During the pilot scale test, the leakage risk of Harpacticoida was completely controlled by the novel technology, and the disturbance of the controlling process to the normal operation of activated carbon layer was avoided since the interception and inactivation processes were completed in sand layer.