1) Why algae is used in wastewater treatment? a) able to use chemical energy to remove nitrogen, phosphorus and carbon dioxide. b) able to use solar energy to remove nitrogen. c) has lower photosynthetic potential compared to higher trophic level plants. d) Able to use solar energy to remove phosphorus, nitrogen and carbon dioxide. 2) which algae species is widely used in wastewater treatment? a) b) c) d) 3) which one is the example of open system? a) Algal Turf Scrubber (ATS) b) High Rate Algal Pond (HRAP) c) Open Pond 4) what is the benefit of using algae in wastewater treatment a) Reduce toxins and pathogenic agents b) improve productivity c) cost saving d) easy to collect 5) Brief process of Algal Turf Scrubber (ATS) a) water is pumped into the water body - the removed nutrient are stored in the water body - water is pumped back into the raceway b) algae remove the nutrient - water is pumped onto the raceway - the removed nutrient are stored in the biomass of algae - water is pumped back into the water body.  c) water is pumped onto the raceway - algae remove the nutrients - water is released back into water body - the removed nutrient are stored in the biomass of algae.

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