周丛藻类对景观水体水质净化的效果研究

Purification of landscaping water with periphyton

采用水体中自然生长的周丛藻类,在近自然条件下,研究周丛藻类对景观水体的净化能力。结果表明,周丛藻类对NH4+-N、TN、TP、TSS(总悬浮物)和Chla(叶绿素a)的平均去除率分别为45.2%、26.9%、25.9%、50%和41%;同时,周丛藻类系统的出水DO质量浓度平均增加5.0 mg/L,pH值平均提高0.5个单位,而空白系统的出水DO质量浓度和pH值没有明显变化。回归分析结果显示,周丛藻类对NH4+-N、TN的最高去除率出现在负荷率分别为0.87 mg/(g.d)(88.9%)和0.40 mg/(g.d)(53.3%)时。试验期间,周丛藻类的生物量增加了52.4%,藻类群落从颗粒态硅藻、绿藻为主的藻群演替为以丝状和颗粒态蓝藻和绿藻为主的群落。

The purifying ability of naturally growing periphyton on landscaping water was studied under near-natural conditions, using periphyton, The results show that the average removal rates of NH4＋ -N, TN （total nitrogen）, TP （total phosphorus）, TSS （total suspended solids） and Chla （chlorophyll a） by periphyton were, respectively, 45.2%, 26.9%, 25.9%, 50% and 41%. The average increase of DO （dissolved oxygen） concentration in the effluent of the periphyton system was 5.0 mg· L^- 1, and the average pH value increased by 0.5, while the DO concentration and pH showed no prominent change in the contrast system without periphyton. Results of regression analysis show that, when the periphyton loading rate of NH4^＋ -N was 0.87 mg/（g· d） and the periphyton loading rate of TN was 0.40 mg/（g· d）, their removal rates by periphyton were greatest, at 88.9% and 53.3%, respectively. During the process, the periphyton biomass increased by 52.4%, and the periphyton composition changed from the original particulate diatom and green algae dominated community to a filamentous and particulate blue algae and green algae dominated community.