Microalgae cultivation for wastewater treatment and biogas production at Moscow wastewater treatment plant

Abstract

The process of cultivation of microalgae on purified and clarified wastewater of Kuryanovo wastewater treatment plants (KWWTP) was studied. The studies were conducted on monoculture (Scenedesmus quadricauda and Chlorella sorokiniana) and on polyculture, the composition of which was formed from microalgae present in the wastewater. The authors created and investigated the columnar photobioreactor (PBR), which acted as a pilot project on the purified and clarified water of KWWTP and allowed the removal of total nitrogen and phosphorus phosphates with an efficiency of up to 90%. The formation of a stable biocenosis from 22 species of algae (with 3-4 dominant species) and 31 species of zooplankton organisms belonging to six systematic subdivisions was recorded. The optimal retention time of the microalgae polyculture for the most effective wastewater treatment has been determined. The conducted studies have shown that the depth of decomposition of ashless matter and the ultimate biogas potential of untreated microalgae biomass is 15% lower than the corresponding values obtained with digestion of activated sludge, which necessitates studies in the field of pretreatment of algal biomass. The paper shows: connections between chlorophyll-a content, algal biomass and fluorescence index F and between biomass increment and Fv/Fm value.

Microbiological treatment system of storage ponds

“…Phosphates steadily increased during the experiment. Basically, it can be assumed that the presence of phosphates in wastewater is caused by the death of activated sludge biomass cells at any stage of biological oxidation [13][14][15]. The explanation of these data requires further research.…”

Sustainable approaches towards wastewater treatment using algal technology along with management of post-harvest biomass

“…The biogas produced from algal biomass can be used for generating power by gas engines as well as an energy source for domestic cooking (Gilbert and Ashraf, 2017). Shchegolkova et al (2018) conducted a study using microalgae for wastewater treatment and biogas production in which significant results were obtained and the biogas produced was composed of 57.0-59.7 % methane and 40.3-43.0 % carbon dioxide.…”

Microalgae cultivation integrated into agro-industrial wastewater treatment

“…Hence, considerable efforts have been focused on the mitigation of the negative impacts on the environment of the waste generation, especially on wastewater production, and the worldwide consumption of energy (Chen et al, 2013;Posadas et al, 2017;Alam and Wang, 2019;Maulana et al, 2019). Based on both goals, microalgae cultivation has been evaluated as a potential source of renewable energy (Chiu et al, 2014;Komolafe et al, 2014;Shchegolkova et al, 2018;Alam and Wang, 2019;Nguyen et al, 2019;Zabed et al, 2020) and pollutant removal agent (Caporgno et al, 2015;Novoveská et al, 2016;Gonçalves et al, 2017;Paddock et al, 2020;Shahid et al, 2020;Al-Jabri et al, 2021) in recent years.…”