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采用“O3+GFH+BF”工艺作为再生水回用景观水体水质维持措施,为了考察该组合工艺的有效性及确定起决定作用的处理单元,将各工艺段出水置于气候培养箱,模拟外界自然条件开展藻类生长试验,结合水质变化规律,考察不同处理单元出水对藻类生长的影响。结果表明,试验开始前“O3+GFH+BF”保障工艺出水相较于二级出水,BOD5、COD、TP、NH4+-N和NO3--N的去除率分别为71.8%、49.4%、96.6%、93.7%和15.3%。经过一个藻类的生长周期(约1个月)的培养后,各处理单元出水中均出现丝状绿藻;人工湖叶绿素-a的质量浓度53 mg.m-3,远低于二级出水中的220 mg.m-3。“O3+GFH+BF”保障工艺能有效抑制再生水景观回用过程中藻类的生长。试验中磷是主要限制因子,确定了GFH工艺是防止景观湖防富营养化的决定性工艺。
In order to investigate the effectiveness of the combined process and determine the processing unit that plays a decisive role, the “O3 + GFH + BF” process was adopted as the water quality maintenance of landscape water for reclaimed water. The effluent from each process section was placed in a climate incubator and simulated Algae growth experiments were carried out under natural conditions and the effects of water from different treatment units on the growth of algae were investigated in combination with the changes of water quality. The results showed that the removal rates of BOD5, COD, TP, NH4 + -N and NO3 - N were 71.8% and 49.4%, respectively, compared with that of the secondary effluent. 96.6%, 93.7% and 15.3%. After one algae growth period (about 1 month), the filamentous green algae appeared in the effluent from each treatment unit. The concentration of chlorophyll-a in the artificial lake was 53 mg.m-3, much lower than that in the secondary effluent Of 220 mg.m-3. “O3 + GFH + BF ” protect the process can effectively inhibit the growth of algae in the process of reuse of reclaimed water landscape. In the experiment, phosphorus was the main limiting factor, and the GFH process was determined to be the decisive process to prevent the eutrophication of the landscape lake.