Simultaneous dissolution and uptake of nutrients in microalgal treatment of the secondarily treated digestate

Ulgudur, Nilufer
Bayramoğlu, Tuba Hande
Demirer, Goksel N.
Anaerobic digestion processes result in large volumes of digestates which still require the development of elaborate and viable management options to improve the sustainability of these processes. Coupling of secondary anaerobic treatment with a microalgal nutrient removal process may serve benefits such as residual biogas and associated greenhouse gas capture from the digestate content, microalgal biomass build-up and its further valorization. This study investigated the applicability a microalgal nutrient removal process in a secondarily treated digestate (the digestate of a digestate) as a complementary unit. The results indicated that up to 100% dissolved reactive phosphorus (DRP), 97.8% total dissolved phosphorus (TDP) and 93.7% ammonium nitrogen (NH4+-N) removal could be attained in the treatment of the digestate of a digestate using microalgal cultures. Folding phosphorus concentrations via dissolution was found to compensate for dilution related phosphorus deficiency for microalgal growth. Microalgal biomass obtained by the end of operation could be concentrated from 6.4-15.5 mg/L to 164.2-502.6 mg/L (2100-7900%) by simple gravity settling which was correlated with the prevalence of agglomerated particles in the size range of 10-100 mu m. The results demonstrated not only the applicability of the microalgal process after secondary anaerobic treatment of the digestate, but also brought about the dissolution concept for nutrients during microalgal growth.


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To enhance the enzymatic conversion of cotton stalks to glucose at high substrate loadings and subsequently to produce ethanol, biomass was subjected to ionic liquid and alkaline pretreatments. Ionic liquid, 1-ethyl-3-methylimidazolium acetate (EMIMAc), which reduced biomass crystallinity, was effective in improving the conversion of cotton stalks to glucose (82-85%) regardless of the substrate loading used during enzymatic hydrolysis. On the other hand, the glucose yield decreased from 67% to 55% with an i...
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Due to high production cost and prevention of environmental pollution, it is important to reduce the amount of nitrogen (N) fertilizer used on wheat (Triticum aestivum L.). The aim of this study was to evaluate N use of 6 x 6 diallel wheat F-2 progenies and parental lines at low (NO, no N fertilizer) and high (N+, 160 kg N ha(-1)) N levels. Significant differences were found between N+ and NO application in grain N content, grain N yield, N use efficiency for grain N yield (NUEgn), and N use efficiency for ...
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Citation Formats
N. Ulgudur, T. H. Bayramoğlu, and G. N. Demirer, “Simultaneous dissolution and uptake of nutrients in microalgal treatment of the secondarily treated digestate,” ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS, pp. 0–0, 2019, Accessed: 00, 2020. [Online]. Available: