Ciencias Exactas y Ciencias de la Salud
Permanent URI for this collectionhttps://hdl.handle.net/11285/551039
Pertenecen a esta colección Tesis y Trabajos de grado de las Maestrías correspondientes a las Escuelas de Ingeniería y Ciencias así como a Medicina y Ciencias de la Salud.
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- Anaerobic co-digestion approach for the valorization of livestock and agricultural waste from critical regions of Jalisco(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2021-12-07) Cervantes Astorga, Enrique; Carrillo Nieves, Danay; puemcuervo, emipsanchez; Gradilla Hernández, Misael Sebastián; Senés Guerrero, Carolina; School of Engineering and Sciences; Campus Monterrey; Aguilar Juárez, OscarLivestock waste is common nonpoint-source pollution with adverse implications on the environment. Given the logistical difficulties of the manure recollecting process, these nutrient-rich residues have negative repercussions on nearby aquatic ecosystems, such as rivers and lakes. Swine and cattle residues are rich in nitrogen, phosphorus, and organic matter, which cause an ecological imbalance after they reach bodies of water through the action of rainfall. As a consequence of this nutrient runoff, watersheds' total nitrogen and phosphorus concentrations rise to harmful levels; thus, developing a phenomenon often known as eutrophication. Abnormal growth of phytoplankton and other macrophytes characterizes eutrophic and hypereutrophic aquatic environments. These algal blooms consume most of the dissolved oxygen, reducing the available oxygen for other species to survive. Livestock manure should be collected before runoff transfers nutrients to the basins to avoid eutrophication. Then, these residues must be treated so they can be disposed of without harming the environment. This work proposes a waste valorization approach to reduce the nitrogen, phosphorus, and carbon concentrations in livestock residues while producing a high-quality renewable energy source. Anaerobic co-digestions with lignocellulosic-rich residues were performed to enhance biogas production while maximizing the overall nutrient removal. The complete process followed in this work is segmented into four separate chapters. The first chapter states the problem, the research questions, the proposed solution, the objectives, and the main contributions of the project. Chapter two proposes a methodological approach to determine critical regions for eutrophication based on public online databases and the use of geographical information systems. This methodology applies machine learning algorithms coupled with spatial operators to analyze large areas of study, such as states, basins, hydrographic regions, and other regions. The case study of the state of Jalisco, in Mexico, is also presented in that chapter to obtain the most critical sub-basins and their correlation with environmental factors, such as rainfall and land use. In chapter three, critical municipalities were selected based on chapter two’s methodology, along with livestock production data in Jalisco. Then, crops were selected from the municipalities' yearly agricultural production to evaluate the co-digestions potential to produce biogas, mixing it with livestock waste. Eighteen different treatments were assessed by their biochemical methane potential and nutrient removal capacity. Chapter three also proposes a waste valorization index that uses both indicators (biochemical methane potential and nutrient removal capacity) to determine the best treatments. Finally, the future perspectives and general conclusions for this work are in chapter four.
- Microalgae-based livestock wastewater treatment and resource recovery: a circular bioeconomy approach(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2021-12-07) López Sánchez, Anaid; Carrillo Nieves, Danay; emijzarate; Orozco Nunnelly, Danielle A.; Senés Guerrero, Carolina; Aguilar Juárez, Óscar; Escuela de Ingeniería y Ciencias; Campus Monterrey; Gradilla Hernández, Misael SebastiánThe livestock industry is a sector of great relevance worldwide. This sector accounts for 1.4% of the world's Gross Domestic Product (GDP) and is a source of livelihood for more than 1.3 billion people. Furthermore, thirty-nine percent of the worldwide protein demand is covered by this sector. However, this activity is one of the top polluting industries, accounting for 14% of the greenhouse gasses (GHG) originated from anthropogenic sources. Additionally, the livestock sector is the largest land user on earth, using 70% of the total agricultural land and 30% of Earth’s land surface. One-third of the global cereal production is destinated for animal feed, of which some nutrients are retained by the animals and the rest is released to the environment without previous treatment, resulting in soil degradation, water and air pollution and, consequently, serious human health impacts. Circular bioeconomy (CBE) has emerged as a potential driver towards the sustainability of livestock production systems. One of the main objectives of the CBE model within the livestock industry is the minimization of the usage of raw material resources through the recycling, reuse, and revalorization of waste and wastewater. Microalgae-based wastewater treatment (MbWT) is a potential solution aligned with the CBE principles, in which the nutrients contained in the livestock wastewater (LW) are recovered and transformed into high value-added products with a wide range of industrial applications. The overall performance of MbWT (i.e., nutrient removal efficiencies and biomass production) is highly dependent on a wide range of factors, such as the microalgal strain and the composition of the wastewater. However, most of the existing studies that implemented MbWT have focused on a single LW type. Therefore, the main objective of this thesis is to treat a mixed effluent composed of the most common ADLW (from cattle, swine, and poultry), to understand the effects of the mixture of all three types of LW on cell growth and pollutant removal efficiencies of microalgal cultures (Chlorella vulgaris, Haematoccocus pluvialis and Chlamydomonas spp.). Through an evaluation of the mixture design, the optimal fraction of these different types of effluents (ADCW, ADSW, and ADPW) was analyzed to obtain maximum microalgal biomass productivity and 7 pollutant removal rates (COD, TN and TP). Furthermore, these microalgae were tested in all possible combinations of mono-, bi-, and tri-cultures. The first chapter of the present thesis consists of a thorough review of the literature to address the most significant factors affecting nutrient removal and biomass productivity in MbWT, including: (i) microbiological aspects, such as the microalgal strain used for MbWT and the interactions between microbial populations; (ii) physical parameters, such as temperature, light intensity and photoperiods; and (iii) chemical parameters, such as the C/N ratio, pH and the presence of inhibitory compounds. Additionally, different strategies to enhance nutrient removal and biomass productivity, such as acclimation, UV mutagenesis, multiple microalgae culture stages (including monocultures and multicultures) are discussed. The second chapter of this thesis presents the first study of MbWT using anaerobically digested swine, poultry and cattle wastewater (ADSW, ADPW and ADCW) mixtures. A centroid mixture design was used to determine the optimal mixture to promote higher cell concentrations and pollutant removal efficiencies of the microalgae Chlorella vulgaris, Haematococcus pluvialis and Chlamydomonas spp. cultured as mono-, bi-, and tri-cultures. Additionally, A redundancy analysis was performed to analyze the correlation between microalgal cultures and the removal efficiencies of the digestate pollutants. The results herein show that C. vulgaris as a monoculture in a digestate mixture of 0.125:0.4375:0.4375 (ADSW:ADPW:ADCW) resulted in cell growth of 3.61×107 ± 2.81x106 cell mL-1, a total nitrogen removal of 85%±2%, a total phosphorus removal of 66%±3% and a chemical oxygen demand removal of 44%±7%. The specific composition of the effluents plays a key role in microalgal performance due to their respective nitrogen and phosphorus content. Furthermore, this study suggests that a mixture of the three most common digestates generated by livestock farms offers a promising alternative for the treatment and revalorization of LW, by taking advantage of the unique composition that each digestate possesses. Further studies are warranted to gain a deeper understanding of the interspecific microalgal interactions occurring in mixed cultures that may enhance or hinder the performance of MbWT.
- Valorization of pelagic Sargassum as a source of alginate and sugars for subsequent biofuel production(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2021-11-01) Amador Castro, Luis Fernando; Carrillo Nieves, Danay; puemcuervo; García Cayuela, Tomás; Guajardo Flores, Daniel; School of Engineering and Sciences; Campus Monterrey; Rodríguez Martínez, VerónicaOver the last decade, massive tides of Sargassum, a genus of brown algae, have arrived at Caribbean shores deriving in a myriad of environmental and economic problems. Aiming to lessen the impacts, governments from the affected countries have opted to remove the seaweed from marine ecosystems. However, its collection is expensive, posing another economic challenge for the already affected countries. Biomass valorization has been proposed as a suitable alternative to funding cleaning activities, triggering numerous investigations in recent years. Albeit different pathways have been suggested, Sargassum biomass has failed to find effective uses in the industry. This study aims to maximize the value of Sargassum as a potential raw material into a biorefinery scheme to produce alginate and sugars, considering this last product for subsequent biofuels production. Findings indicate that alginate extraction and sugar production can be effectively coupled within the same valorization scheme and that their integration also results in sugar maximization after biological pretreatment. The alginate extraction and purification process resulted in high polymer yields (38.75% ± 0.93 dry weight). The final product was found to be free of toxic elements opening the doors for its application in different fields. Lastly, Sargassum sugars extracts did not inhibit the growth of Yarrowia lipolytica, an oleaginous yeast, suggesting that they can be subsequently converted into biofuels.