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Biogas Production and Biofertilizer Estimation from Anaerobic Co-Digestion of Blends of Wastewater and Microalgae
International Journal of Chemical Engineering ( IF 2.7 ) Pub Date : 2022-06-10 , DOI: 10.1155/2022/3560068
Wagari Mosisa Kitessa, Fekadu Fufa, Didha Abera

The study aimed to investigate the enhancement of biogas production through anaerobic digestion from blends of wastewater and microalgae. The microalgae functioned as a co-substrate. A series of laboratory-scale batch anaerobic co-digestion of the wastewater and microalgae were carried out under mesophilic conditions for 21 days. Biogas production rates from wastewater (WW) alone and different blends of WW and microalgae (MA) were analysed. In addition, the nutrient values and reduction in the volume of the WW after digestion were determined. The results show that the quantity and quality of biogas produced with different mix ratios of WW to MA (WW only, 3 : 1, and 3 : 2) were 24 mL CH4/g COD, 37 mL CH4/g COD, and 44 mL CH4/g COD, respectively. At the optimum mix ratio, the optimum methane produced was 44 mL CH4/g COD, which is much lower than volumes of gas STP conditions, which is 350 mL CH4/g COD. The values of TS, VS, and COD were also reduced by 43.11%, 40.09%, and 71.99% at the optimum mix ratio, respectively. The optimum mix ratio of 1732.77, 77.14, and 174.26 kg/year of urea, diammonium phosphate, and potash fertilizer, respectively, was obtained. The results indicate that biogas production can be improved through co-digestion of WW and MA as a co-substrate relatively, but to improve the production rate another substrate should be investigated. However, the result can be used as a supplementary investigation for practical application in energy production.

中文翻译:

废水和微藻混合物的厌氧共消化沼气生产和生物肥料估算

该研究旨在研究通过厌氧消化废水和微藻混合物来提高沼气产量。微藻起共底物的作用。在中温条件下对废水和微藻进行了一系列实验室规模的批量厌氧共消化 21 天。分析了仅来自废水 (WW) 以及 WW 和微藻 (MA) 的不同混合物的沼气产量。此外,还测定了消化后 WW 的营养价值和体积减少。结果表明,不同WW与MA混合比(仅WW、3:1和3:2)产生的沼气数量和质量分别为24 mL CH 4 /g COD、37 mL CH 4 /g COD和44 毫升 CH 4/g COD,分别。在最佳混合比下,产生的最佳甲烷为 44 mL CH 4 /g COD,远低于气体 STP 条件的体积,即 350 mL CH 4 /g COD。在最佳混合比下,TS、VS 和 COD 的值也分别降低了 43.11%、40.09% 和 71.99%。得出尿素、磷酸二铵、钾肥的最佳配合比分别为1732.77、77.14、174.26 kg/年。结果表明,通过共同消化 WW 和 MA 作为辅助底物,可以相对提高沼气产量,但为了提高产率,应研究另一种底物。然而,该结果可以作为能源生产实际应用的补充研究。
更新日期:2022-06-10
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