Nutrient removal efficiency using microalgae in different photoperiod cycles, combined with constructed wetland in a wastewater treatment plant

This research evaluates the removal of nutrients by microalgae in different photoperiod cycles, combined with constructed wetland wastewater treatment plant University Santa Cruz do Sul, RS, Brazil. The used took place between July and December 2018 consisted following steps: preliminary treatment, secondary an anaerobic reactor, tank (MT), sand filter wetland, using macrophyte Chrysopogon zizanioides. In tank, three light cycles were considered: 12h/12h, 24h 18h/06h, whose lighting was powered a white LED lamp 9 Watts 6000 Kelvin, regulated controller. results indicated that there no significant differences (p>0.05) values soluble phosphorus, ammoniacal nitrogen, COD BOD for MT comparing (12h/12h, 18h/06h). However, system setup removed 100% total coliforms, E. coli TSS cycles. Regarding organic matter, cycle best performance 24-hour cycle, considering 67.6% 94.0% 63.7% 42, 7% BOD, at end process. These demonstrate use combination has greater efficiency nutrients, mainly phosphorus addition to reducing physical-chemical parameters eliminating effluent toxicity.
 Keywords: plant.