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Culture of cyanobacteria for tertiary wastewater treatment and biomass production
AbstractIn order to determine factors influencing the treatment efficiency of wastewater by culture of cyanobacteria, experiments were conducted at laboratory scale on the effect of different aeration-agitation modes (stirring and air bubbling) on treatment efficiency, growth rate and occurence of grazers and Chlorella-like cells. Nitrate addition and dissolved oxygen were also studied. The best aeration-agitation mode, according to treatment efficiency and growth rate, was the culture bubbled on a 14/24 h basis: ammonia and phosphate removal were 95 and 62% respectively (for a treatment time of one day) and growth rate was 0·34 per day. Stirring bars did not appear to be a suitable system to agitate filamentous cyanobacterial cultures because of the low culture aeration, the occurence of nitrification and the breakage of algal cells. This last effect appeared to explain the low level of grazer population. Populations of Chlorella-like cells remained relatively low in both aeration-agitation modes. Dissolved oxygen did not have a marked effect on grazer population. Addition of inorganic nitrate to senescent cultures markedly improved the health condition of cyanobacteria cultures.
Culture of cyanobacteria for tertiary wastewater treatment and biomass production
AbstractIn order to determine factors influencing the treatment efficiency of wastewater by culture of cyanobacteria, experiments were conducted at laboratory scale on the effect of different aeration-agitation modes (stirring and air bubbling) on treatment efficiency, growth rate and occurence of grazers and Chlorella-like cells. Nitrate addition and dissolved oxygen were also studied. The best aeration-agitation mode, according to treatment efficiency and growth rate, was the culture bubbled on a 14/24 h basis: ammonia and phosphate removal were 95 and 62% respectively (for a treatment time of one day) and growth rate was 0·34 per day. Stirring bars did not appear to be a suitable system to agitate filamentous cyanobacterial cultures because of the low culture aeration, the occurence of nitrification and the breakage of algal cells. This last effect appeared to explain the low level of grazer population. Populations of Chlorella-like cells remained relatively low in both aeration-agitation modes. Dissolved oxygen did not have a marked effect on grazer population. Addition of inorganic nitrate to senescent cultures markedly improved the health condition of cyanobacteria cultures.
Culture of cyanobacteria for tertiary wastewater treatment and biomass production
Pouliot, Y. (author) / Buelna, G. (author) / Racine, C. (author) / de la Noüe, J. (author)
Biological Wastes ; 29 ; 81-91
1988-12-01
11 pages
Article (Journal)
Electronic Resource
English
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