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The objective of this paper is to present the design, construction andoperation of 3 full scale semi-closed, horizontal tubular photobioreactors(PBR) used to remove nutrients of a mixture of agricultural run-off (90%) andtreated domestic wastewater (10%). The microalgal biomass produced in the PBRswas harvested in a static lamella settling tank. Each PBR treated in average2.3 m3/d. PBRs were submitted to strong seasonal changes regarding solarradiation and temperature, which had a direct impact in the activity ofmicroalgae and the efficiency of the system. Higher mixed liquor pH values wereregistered in summer (daily average> 10). Most of the influent and effluentnitrogen content was inorganic (average of 9.0 mg N/L and 3.17 mg N/L,respectively), and in the form of nitrate (62% and 50%, respectively). Averagenitrogen removal efficiency was 65%, with values of around 90% in summer, 80%in autumn, 50 % in winter and 60% in spring. Most of the influent and effluentphosphorus content was in the form of ortophosphate. Influent average was 0.62mg P/L, but with great variations and in a considerable number of samples notdetected. Removal efficiency (when influent values were detected) was very highduring all the study, usually greater than 95%, and there were not clearseasonal trends for efficiency as observed for TIN. Volumetric biomassproduction greatly changed between seasons with much lower values in winter (7g VSS/m3d) than in summer (43 g VSS/m3d). Biomass separation efficiency of thesettler was very good in either terms of turbidity and total suspended solids,being most of the time lower than 5 UNT and 15 mg/L, respectively. Overall thisstudy demonstrated the reliable and good effectiveness of microalgae basedtechnologies such as the PBR to remove nutrients at a full scale size.

Nutrient removal from agricultural run-off in demonstrative full scale tubular photobioreactors for microalgae growth