“O_3+GFH+BF”再生水处理工艺不同阶段出水中藻类的生长特征研究

THE STUDY ON GROWTH CHARACTERISTICS OF ALGAE IN DIFFERENT PERIODS EFFLUENT OF “OZONE+GFH+BF” RECLAIMED WATER TREATMENT PROCESS

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。

＂Secondary effluent＋Ozone＋GFH＋BF＂process was adopted as quality maintenance measure of landscape,In order to study the combination process was effectiveness,and define which processing unit play a decisive role.The effluent of section processes were trained in climate incubator.The algae growth test was carried in the conditions of simulating the outside.Then,based on changes law of water quality,the inhibition effects to algae growth were studied.Before the test,the effluent of＂Ozone ＋GFH＋BF＂process was compared with secondary effluent,the removal rates of BOD5,COD,TP,NH4＋-N and NO3--N were 71.8%,49.4%,96.6%,93.7% and 15.3% respectively.After cultured a growth cycle of algae（about one month）,filamentous green algaes were found in all water samples.The chlorophyll-a concentration of lake was 53 mg.m-3,it was lower than secondary effluent which was up to 220 mg.m-3.The results showed that ＂Ozone ＋GFH＋BF＂ security process can effectively inhibit the growth of algae which may appear in landscape reused of reclaimed water.In this experiment,the phosphorus was the main limiting factor,which determined GFH process was decisive process of preventing landscape lake from eutrophication.