Ratio Of Microalgae Research Articles

Immobilizing Microcystis aeruginosa and powdered activated carbon for the anaerobic digestate effluent treatment.

The environment pollution caused by livestock anaerobic digestate effluent (ADE) is becoming increasingly severe recently. In this study, immobilized technology, embedding Microcystis aeruginosa (MA) and powdered activated carbon (PAC) with sodium alginate (SA), was employed to investigate the removal performance of nitrogen (N), phosphorus (P) and dissolved organic matter (DOM) in the treatment of ADE solution. Initially, orthogonal experiment was carried out to achieve the optimal conditions of the beads fabrication with the concentration of imbedding agents (PAC-SA) of 5% (w/w) and the ratio of microalgae and imbedding agents was 1:1 (v/v). The results indicated that the total nitrogen (TN), total phosphorus (TP) and total organic carbon (TOC) can be efficiently removed under the optimal operation conditions, with average removals of 91.88±2.91% in TN, 98.24±0.12 in TP and 78.31±1.57% in TOC, respectively. Moreover, the fluorescence excitation-mission matrix (EEM) results illustrated that IMA-PAC beads joined system can efficiently diminish the concentrations of protein-like compounds and humic substances. Therefore, the organic contaminants and nutrients (i.e. N and P) can be efficiently removed in IMA-PAC beads joined system, which would contribute to developing new strategies for the treatment of ADE solution and nutrient recycle.

Determination Number Of Magnesium Nutritions From MgSO4.7H2O AND IRON FROM FeSO4.7H2O on Tetraselmiss chuii Cultivation To The Maximum Lipid Contact

This study discusses the effect of adding magnesium nutrients from MgSO4.7H2O and iron from FeSO4.7H2O to obtain maximum lipid levels in Tetraselmis chuii microalgae. The nutritional variations used were 0, 4, 6, 8 gr / L MgSO4.7H2O and 0, 24, 30, and 36 µM / L FeSO4.7H2O. Microalgae was cultivated with a photobioreactor filled with 1 L microalgae culture with a ratio of microalgae and sea water 3: 7, namely 300 ml of microalgae and 700 ml of sea water with salinity of 30 ppt. The light intensity is 2000 lux. The study began with culturing microalgae with variations in these nutrients. Then, the cell density is observed every 3 hours until the optimum time is obtained where the cell density is high. Then the microalgae is harvested and extracted so that the lipids are obtained. The extraction process was carried out using diethyl ether solvents. After obtaining the lipid mass, the microalgae lipid levels were calculated. The results showed that the highest lipid levels in Tetraselmis chuii microalgae were obtained by the addition of MgSO4.7H2O 6 gram and the addition of FeSO4.7H2O 36 µM which was 20,175%.

Optimization of the digestion process of Scenedesmus sp. and Opuntia maxima for biogas production

Scenedesmus biomass is not an adequate substrate for anaerobic digestion due to its low biodegradability and low biogas yield. This study aims to evaluate the anaerobic co-digestion of Scenedesmus microalgal biomass and Opuntia maxima cladodes, the latter added in order to improve the digestion process. Batch assays were conducted to evaluate possible synergistic effects in different mixtures of both substrates. Mixture with highest methane yield was digested in semi-continuous mode at different VS concentrations. Feedstock composed of 75% O.maxima and 25% Scenedesmus (VS basis) showed the highest methane yield increasing 66.4% and 63.9% that of Scenedesmus and O.maxima, respectively. In semi-continuous mode, ideal organic loading rate (OLR) with 6%VS feed concentration was 4gVSL−1d−1, which yielded 292±39LCH4kgVS−1 (15days HRT). In the case of 8%VS feed concentration ideal OLR was 5.33gVSL−1d−1, which yielded 308±22LCH4kgVS−1 (15days HRT). The co-digestion of O.maxima and Scenedesmus biomass enhanced the anaerobic digestion process and avoided inhibition caused by low C/N ratio of microalgae.