Instituto de Ingeniería, Universidad Nacional Autónoma de México, Circuito Escolar, Ciudad Universitaria, C.P. 04510, Mexico City, Mexico; Tecnológico de Monterrey, Escuela de Ingeniería y Ciencias, Ave. Eugenio Garza Sada 2501, Monterrey, N.L. 64849, Mexico.
Instituto de Ingeniería, Universidad Nacional Autónoma de México, Circuito Escolar, Ciudad Universitaria, C.P. 04510, Mexico City, Mexico.
J Environ Manage. 2021 Feb 1;279:111813. doi: 10.1016/j.jenvman.2020.111813. Epub 2020 Dec 15.
Microalgae-bacteria consortium based technology using a High Rate Algal Pond (HRAP) interconnected to an Absorption Bubble Column (ABC) has emerged as an environmentally friendly promising option to upgrade biogas. However, the oxygenic photosynthesis of microalgae induces oxygen contamination in upgraded biogas, which could limit its further applications. Several strategies were proposed to favor the oxygen desorption and oxygen uptake in parts and accessories of the upgrading system. The effect of the volumetric ratio liquid recirculation rate/biogas rate (L/G = 5.0, 1.0 y 0.5) was evaluated in conjunction with the application of a novel accessory called Open Trickling Column (OTC). The O content in upgraded biogas was around 2.1%v, attaining CO removal efficiencies around 90%, at L/G ratio of 1.0 during diurnal and nocturnal periods. The inclusion of an OTC at the previous L/G, enhanced 54% the removal of O by stripping and uptake compared with the basal condition. Mass balances of HS and methane showed that L/G > 1.0 favored the complete oxidation of HS but promoted the loss of methane in dissolved form. Additionally the effect of increasing linear velocity of liquid broth in the lab-scale HRAP (from 15 cm s to 20 cm s) showed to improve the O stripping with a consequential increase of biomass concentration under steady-state (from 0.7 to 1.4 g L) besides achieving O content in the upgraded biogas around 1.5%v.
基于微藻-细菌联合体的技术，利用高速藻类塘（HRAP）与吸收气泡柱（ABC）相互连接，已成为一种环保且有前途的升级沼气的选择。然而，微藻的需氧光合作用会导致升级沼气中的氧气污染，从而限制其进一步应用。已经提出了几种策略来促进升级系统的各个部分和附件中的氧气解吸和氧气摄取。评估了液体再循环率/沼气率的体积比（L/G=5.0、1.0 和 0.5）的影响，同时还应用了一种称为开放式滴流柱（OTC）的新型附件。在 L/G 为 1.0 的昼夜期间，升级沼气中的 O 含量约为 2.1%v，CO 去除效率约为 90%。在先前的 L/G 条件下，包含 OTC 可将 O 的去除率通过汽提和吸收提高 54%。HS 和甲烷的质量平衡表明，L/G>1.0 有利于 HS 的完全氧化，但促进了以溶解形式损失的甲烷。此外，增加实验室规模 HRAP 中液体培养液的线性速度（从 15 cm s 增加到 20 cm s）的影响表明，通过提高生物质浓度（从 0.7 增加到 1.4 g L），可以改善 O 的汽提，同时在稳态下实现升级沼气中 O 含量约为 1.5%v。
