冬季水网藻对源水水质的净化作用

为保护源水水质,控制水质富营养化,利用水网藻来以藻治藻。中试结果表明,水网藻在冬季仍能正常生长,但生长速度下降,这与气候有密切关系。与对照测点比较,网袋内氨氮、生化需氧量和总磷的浓度分别下降了15.6％、28.6％和7.5％,水网藻在冬季仍可作为净化水源水质的一项生态工程措施。藻类的演替,与光照、水温和氮磷比等环境因素有关,由于这些因素难以控制,只能因地制宜,利用现有的种类净化水质。

Purification Ability of Hydrodictyon for Source Water in Winter

Hydrodictyon was applied to control algae by alga for protecting quality of source water and controlling eutrophication. The results of pilot experiment showed that hydrodictyon could grow still in winter, but growth rate decreased, it was closely related to climate. The concentrations of NH3-N, BOD5 and TP in net bag decreased by 15.6%, 28.5% and 7.5% respectively in comparison with control site. Hydrodictyon can be applied to purify source water in winter as ecological-engineering measure. The succession of algae is influenced by various environmental factors, such as light, temperature and ratio of nitrogen and phosphorus. Owing to the difficulty for controlling these factors in natural condition, so it can only purify source water by existing species.