Exploring a new generative paradigm that shifts away from current unsustainable agronomics towards biodiverse energy sources, not only reduces environmental pollution, such as manganese from soil and sewage, but it can also be used to harness renewable energy sources. By enhancing the metabolic pathways of microbes, micro-technology can convert organic waste into electricity and store solar energy as a source of renewable energy.
Microbes are increasingly being used as a renewable and sustainable energy source due to their ability to produce biofuels and other valuable products from renewable feedstocks such as plant biomass, agricultural waste, and industrial waste. Microbes such as bacteria, yeasts, and microalgae can be used to produce biofuels such as ethanol, biodiesel, and biogas from renewable feedstocks. These biofuels have the potential to replace fossil fuels and reduce greenhouse gas emissions, as non-renewable carbon accumulates in the atmosphere, outpacing sequestration.
Renewable feedstocks are expected to gradually replace fossil fuels as both fuel and raw materials for the chemical industry. Some photosynthetic microbes such as cyanobacteria and microalgae can convert solar energy into biomass and other valuable products. These microbes have the potential to produce biofuels and other valuable products with high energy content and low environmental impact.
Biomass as a Promising Alternative to Produce Clean and Sustainable Energy
Biomass is a term that encompasses all organic and biological matter from living organisms, produced through direct or indirect processing. This valuable resource is sourced from microbes and vegetation, and can be used as a feedstock for carbon capture and storage due to its availability and zero emissions.
The process of converting CO2 into biomass involves a diverse range of biological species, including plants and microorganisms such as bacteria, fungi, yeast, and algae. Given the ongoing challenges of land scarcity and clean water in modern agriculture, biofuels derived from non-food crops, such as forestry, wood-based products, and waste from industry, food, and animals offer a promising alternative as global resources continue to be strained by population growth.
Plants with higher potential for biomass production and CO2 fixation, optimal nutrient uptake, and decreased synthetic pesticide use have emerged as a key pathway for the generation of bioenergy, according to a Biotechnology for Biofuels report. A large number of resources, such as are required to produce biomass and energy from plants, currently makes it an economic challenge. However, algal cultivation in ponds, tanks, and even oceans opens the potential to yield highly sustainable energy sources.
Microalgae have garnered attention as a sustainable feedstock for biofuel production in response to the depletion of fossil-based fuels and chemicals. The metabolic transcription factors of algal play a crucial role in efficient conversion of organic waste into biofuels and other bioproducts. However, the high costs of pure microalgae cultivation for biofuels and biomaterials make it commercially unviable.
Coupling Microalgae and Waste-Borne Microorganisms
The integration of microalgae-based biofuel production with wastewater treatment presents a promising solution for overcoming the economic challenges associated with pure microalgae cultivation as a renewable energy source. This approach highlights the necessity for additional research on the interplay between microalgae and microorganisms found in wastewater, including microzooplankton, bacteria, fungi, algae, and viruses, as well as the underlying mechanisms driving these interactions.
A review in Algal Research highlights the anaerobic digestion of microalgae biomass has the potential to significantly enhance the economic viability of liquid biofuel production while also offering a potential source of wastewater treatment and biogas-derived renewable energy for heating, electricity generation, and transportation. However, there are limitations that need to be overcome to achieve successful anaerobic digestion of microalgae biomass.
Further research is required to investigate the optimal conditions for the process and to develop strategies to overcome challenges such as microbial inhibition, low substrate concentration, and variability in microalgae biomass quality. By addressing these challenges, the integration of anaerobic digestion with microalgae-based biofuel production has the potential to provide a sustainable and cost-effective source of renewable energy.
Virtuous Biological Conversion Strategy
As industrialisation meets the growing demands of the world’s population, toxic by-products and air pollutants are becoming increasingly problematic. They affect the lives of people and damage our environment, while requiring additional energy resources to treat the waste, creating a vicious cycle.
However, what if these waste products that are devastating to our environment could be converted into a virtuous cycle?
A scientific report in Nature Journal examined the connection between bacteria-based carbon sequestration and waste chemicals to maximise resource cycling. Currently, sulphur and ammonia cause acid rain and air pollution, and bacteria can play a critical role in sequestering CO2 emissions and recycling ammonium sulphate as sustainable biofertilizers.
This novel approach employs microorganisms to convert sulphur and ammonia into usable forms as a source of energy and nitrogen for fertiliser production. Specialised microbes are essential to fixating nitrogen and making it available to plants as ammonium sulphate. They facilitate the conversion of waste products into usable forms that can benefit both the environment and agriculture. Addressing the environmental and economic challenges caused by these abundant waste products in the oil refining industry by mitigating greenhouse gas emissions and providing sustainable biofertilisers has the potential to be a game-changer.
Virtuous resource recycling is still theoretical and a proof of concept. However, it has the potential to reduce industrial CO2 emissions. Martinez et al. metabolomic study examined how bioleaching bacteria, such as Acidithiobacillus species, are involved in the sulphur oxidation pathway of beneficial glutathione and aspartic acid substances. These amino acids are known constituents of the intra- and extracellular matrix that play a role in cell functions such as detoxification, biofilm formation, energy management, and stress responses.
Therefore, the concept of using the abundant by-product of sulphur as energy and NH3, which is conventionally combusted as waste in oil refining plants, is highly attractive as it allows for the simultaneous achievement of CO2 reduction and the production of nitrogen fertilisers containing ammonium sulphate.
As science continues to study cellular processes, it is becoming increasingly clear how important tiny microorganisms can be in creating and transforming waste into regenerative sources of energy, while simultaneously sequestering carbon and addressing some of the most pressing challenges we face today. This understanding is crucial in preserving a sustainable future for humanity.
