Assessment of inorganic nitrogen and phosphorus compounds removal efficiency from different types of wastewater using microalgae cultures

The efficiency of ammonium nitrogen (N-NH₄⁺) and phosphate (P-PO₄^3-) removal from wastewater with different loads of these nutrients was evaluated using Chlamydomonas reinhardtii (Сhlоrорhуtа) and Oscillatoria neglecta (Суаnорhуtа/Cyanoprokaryota). In addition, functional characteristics of the microalgae under the studied conditions were determined. It was demonstrated that Ch. reinhardtii is resistant to a wide range of concentrations of inorganic nitrogen and phosphorus compounds. Microalgae actively participate in the removal of N-NH₄⁺ from wastewater (removal efficiency of 49–63%, depending on the initial concentration). At the same time, Ch. reinhardtii showed low levels of P-PO₄^3- removal (7–18%) from the aquatic environment. O. neglecta, unlike Ch. reinhardtii, is sensitive to excessively high concentrations of N-NH₄⁺ (90–140 mg l^-1) and P-PO₄^3- (26–90 mg l^-1). However, it is characterized by high removal efficiency for both forms of nitrogen (60–61%) and phosphorus (43–55%) at their initial concentrations of 30–50 mg l^-1 and 7–14 mg l^-1, respectively. Therefore, O. neglecta is best suited for use in wastewater post-treatment.

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