Purification effect of several microalgae on aquaculture wastewater
In order to screen the dominant algae that can adapt to the tropical marine aquaculture envi-ronment and purify aquaculture wastewater efficiently,the ability of five microalgae to remove chemi-cal oxygen demand(COD),total nitrogen(TN),total phosphorus(TP)and nitrite nitrogen(NO-2 N)was analyzed and compared.Chlorella sp.,Nannochloropsis sp.,Nitzschia sp.,Chaetoceros sp.,which were locally screened in Hainan,and purchased species Scenedesmus sp.were selected and cul-tured in eutrophic aquaculture wastewater with shrimp aquaculture water as bottom solution for 6 days.The results showed that Chlorophyta grew faster and diatom grew slower in aquaculture wastewater.Chlorella sp.grew best in eutrophic aquaculture wastewater,with the highest OD680 val-ue,chlorophyll-a content and cell density,which were significantly different from other algae species(P<0.05).Among the five kinds of algae,the ones with good COD removal effect were Nitzschia sp.and Chlorella sp.,and the removal rates were 71.6%and 70.4%respectively.The algae species with good removal efficiency of total nitrogen were Nitzschia sp.,Chlorella sp.,Chaetoceros sp.and Nannochloropsis sp.,and the removal rates were 50.36%,47.96%,46.41%and 42.79%respective-ly.Nitzschia sp.was the best algae to remove total phosphorus,and the removal rate was 71.43%.The algae species with good removal effect of nitrite nitrogen were Nitzschia sp.,Scenedesmus sp.and Chaetoceros sp.,The removal rates in two days were 96.60%,95.63%and 95.40%respectively.Nitzschia sp.had the best comprehensive purification effect on aquaculture wastewater.
万方数据
维普
