水力空化耦合电解抑藻工艺性能的初步研究
Research on algae-inhibition performance of hydraulic cavitation system combined with electrolytic method
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摘要: 采用水力空化与电解耦合的工艺去除水体中的藻类。初步探索了包括空化管径和电解时间在内的处理工艺参数，改善了处理装置结构。试验选用天然水体优势藻种——铜绿微囊藻和水华鱼腥藻为研究对象，在优化后的水力空化条件下，水头压力0.33 MPa，电流密度为2.13 mA/cm2，处理10 L密度为3.0×106 mL-1的铜绿微囊藻藻液。结果表明，该装置具有显著的抑藻效果，处理30 min的水样在处理后培养3 d可以达到76.9%的抑藻率，4 d后抑藻率上升到到97.5%。而对藻液分别进行单独空化30 min和单独电解30 min后培养4 d的抑藻率分别为27.7%和27.8%，表明空化耦合电解具有协同作用。通过比较该装置对不同藻种以及处于不同生长阶段的藻种的处理效果，发现装置对铜绿微囊藻的抑藻率显著优于水华鱼腥藻；对于铜绿微囊藻而言，处于对数生长期的藻细胞比稳定生长期更易被除去。Abstract: The combination of hydraulic cavitation and electrolysis was used to inhibit the growth of the mainly algae species in water bloom in China— microcystis aeruginosa and anabaena flosaquae. Firstly the parameters of the system, including the diameter of the cavitation pipe and electrolytic time, were compared. Under the optimized condition，0.33 MPa(hydraulic pressure), combined with the electrolytic treatment of which the current concentration was 2.13 mA/cm2, 10 L microcystis aeruginosa solution, in which the algae density was 3.0×106mL-1, was treated by the combination system. According to the result, the sample being treated for 30 min was cultivated and the inhibition rate achieved 76.9% in the third day, and in the forth day the inhibition rate was 97.5%. While the results of treatment by only cavitation and only electrolysis method were 27.7% and 27.8% respectively, which proved that the combination could gain synergetic effect. With the comparison of the treatment effects of different species, result showed that microcystis aeruginosa could be treated more efficiently than anabaena flosaquae. The experimental result also showed that microcystis aeruginosa in index growth phase was more easily inhibited by the combination than that in stable growth phase.
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Key words:
- hydraulic cavitation /
- electrolysis /
- microcystis aeruginosa /
- inhibition rate
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