Standardized Applications and Value Analysis of Industrial Oxygen Generators in the Biofermentation Industry

Dissolved oxygen is a critical process parameter that determines both the yield and quality of bioprocesses. The vast majority of industrial fermentations are aerobic, requiring a continuous and stable supply of oxygen. Conventional compressed-air aeration delivers limited oxygen, and under high‑density fermentation conditions it often leads to insufficient dissolved oxygen and unstable process parameters, resulting in reduced conversion rates, extended fermentation cycles, and increased formation of by‑products—issues that constrain capacity expansion. Industrial oxygen‑generation systems based on PSA and VPSA technologies can produce oxygen‑enriched gas at concentrations of 90% ± 3% on site; by blending this gas with compressed air, they enable precise and stable control of dissolved‑oxygen levels in fermenters, effectively addressing the limitations of traditional aeration methods. These systems serve as essential auxiliary equipment for enhancing product quality and efficiency while reducing energy consumption and costs in bioprocessing. This paper systematically outlines their standardized application scenarios and process‑level value across various fermentation sub‑sectors.

I. Applications in the Pharmaceutical and Antibiotic Fermentation Fields

Antibiotic‑producing strains are predominantly filamentous microorganisms such as molds and streptomycetes. During both biomass growth and product synthesis, these organisms exhibit high oxygen consumption and demand exceptionally stable dissolved‑oxygen levels, making them a key application area for industrial oxygen‑generation systems. In the production of mainstream antibiotics—including penicillins, cephalosporins, erythromycin, and chlortetracycline—cell density rises sharply in the mid‑ to late‑stage fermentation. Simple air sparging is insufficient to meet the oxygen‑supply requirements; when dissolved oxygen falls below a critical threshold, it directly inhibits antibiotic biosynthetic pathways, thereby reducing fermentation titer.

Industrial oxygen generators enable fully controllable, oxygen-enriched aeration, with oxygen concentrations dynamically adjusted according to the fermentation stage: during the microbial growth phase, dissolved oxygen is maintained steadily at 40%–60%, while in the product‑synthesis phase it is controlled at 25%–40%. This process eliminates the need for excessive increases in agitator speed and aeration rates, effectively reducing shear‑induced damage to mycelial cells and minimizing by‑product formation. Real‑world production data show that, when paired with oxygen‑enrichment equipment, antibiotic fermentation titers can increase by 15%–30%, fermentation cycles are shortened by 10%–20%, and equipment‑related agitation energy consumption is reduced by more than 20%. Moreover, the stable oxygen‑supply environment enhances batch‑to‑batch consistency, meeting the standardized control requirements of pharmaceutical manufacturing.

In the high-end fermentation sector of the biopharmaceutical industry—covering the fermentation of recombinant proteins, vaccines, interferons, and other biologics produced in Pichia pastoris and Escherichia coli, as well as mammalian cell culture processes—industrial oxygen generators can replace traditional liquid‑oxygen cylinders, providing continuous, stable oxygen supply around the clock. This eliminates issues such as cylinder replacement, pressure fluctuations, and unstable gas supply, thereby effectively maintaining cell viability and maximizing protein expression levels, and ultimately improving the production yield and quality compliance of advanced biopharmaceutical products.

II. Applications in the Field of Amino Acid Fermentation

Amino acids are core raw materials in the food‑additive and feed industries. Currently, the industry widely employs high‑density fed‑batch fermentation, where oxygen supply is a critical limiting factor that determines sugar‑to‑acid conversion rates, product concentrations, and production capacity. For bulk amino acids such as glutamic acid, lysine, and threonine, as well as specialty amino acids like tryptophan, valine, and glutamine, the production strains exhibit high respiratory intensities during the high‑density fermentation phase, highlighting significant oxygen‑supply deficiencies in conventional aeration processes.

By supplying an oxygen‑rich gas stream via an industrial oxygen generator and blending it with compressed air for aeration, this process precisely addresses oxygen deficits in the mid‑ to late‑stage fermentation, stabilizes dissolved oxygen levels within the fermenter, and ensures the strain’s normal metabolic activity and acid production. This technology effectively enhances raw material utilization: for bulk amino acid fermentations, it boosts sugar‑to‑acid conversion rates by 6%–12%, increases the acid production rate by more than 8%, and enables final product concentrations to consistently exceed 180 g/L. For engineered strains producing specialty amino acids, oxygen enrichment helps prevent metabolic disturbances caused by oxygen limitation, reduces impurity formation, and improves product purity and process stability.

III. Applications in the Field of Industrial Enzyme Fermentation

Industrial enzyme preparations are primarily produced through microbial fermentation using strains such as Bacillus subtilis, Aspergillus niger, and Trichoderma, encompassing categories like amylases, proteases, glucoamylases, cellulases, and lipases. Enzyme‑production fermentation exhibits distinct phase‑specific characteristics: the oxygen‑consumption requirements during the biomass‑growth phase differ markedly from those during the enzyme‑synthesis phase. Under low‑dissolved‑oxygen conditions, microorganisms may engage solely in biomass proliferation, failing to initiate efficient enzyme‑producing metabolic pathways, thereby directly reducing enzyme activity and final product yield.

Industrial oxygen generators can continuously supply stable, oxygen‑enriched air in accordance with the requirements of enzyme‑production fermentation processes, matching the oxygen consumption needs of different fermentation stages, thereby stimulating the strain’s enzyme‑producing capacity and significantly enhancing the activity of the final enzyme product. At the same time, oxygen‑enriched aeration improves dissolved‑oxygen efficiency without increasing aeration volume, effectively reducing foam formation in the fermenter, lowering the dosage of antifoaming agents, minimizing raw‑material consumption and product impurities, and optimizing both production costs and product quality.

IV. Applications in the Fermentation of Food and Biological Additives

The production of organic acids such as citric acid, gluconic acid, and itaconic acid, as well as bio‑additives like high‑activity yeast, hyaluronic acid, β‑carotene, and xanthan gum, all rely on typical aerobic fermentation processes that depend throughout the entire cycle on a stable oxygen supply. Among these, the Aspergillus niger–mediated fermentation for citric acid production is one of the most widely scaled fermentation processes worldwide; during the mid‑ to late‑stage of fermentation, the oxygen demand rises sharply, and conventional air sparging can no longer meet production requirements, often leading to elevated residual sugar levels and reduced yields.

When used in conjunction with industrial oxygen generators to supply enriched oxygen, this approach can effectively optimize microbial metabolic efficiency, reduce residual sugar levels in fermentation, shorten the production cycle, and increase the yield of organic acids. In yeast propagation and large-scale production processes, oxygen-enriched aeration enhances yeast cell density and viability, lowers residual fermentable sugars, and improves the quality of the final yeast product. Furthermore, during the biosynthesis of polysaccharides and natural pigments, a stable, high‑dissolved‑oxygen environment ensures smooth metabolic pathways and boosts product yields.

V. Applications in the Field of Fermentation of Agricultural Biological Preparations

Microbial pesticides and live‑microbe formulations, such as Bacillus thuringiensis, Bacillus subtilis, and agricultural streptomycin, are widely used for the control of agricultural pests and diseases and for soil improvement. Their fermentation processes demand high stability in dissolved oxygen levels. During high‑density live‑microbe fermentation, insufficient oxygen supply can lead to a decline in viable cell counts, an increase in by‑products from contaminant microorganisms, and a reduction in the content of active ingredients and product efficacy.

Continuous, stable oxygen-enriched air supply from industrial oxygen generators ensures the proliferation and metabolic needs of functional microorganisms, increases the viable cell count in fermentation broths, reduces the accumulation of inactive metabolic byproducts, and enhances both the purity and efficacy of bio‑product formulations, thereby meeting the production requirements of large‑scale, standardized agricultural bio‑product manufacturing lines.

VI. Process and Operational Advantages of Industrial Oxygen Generators

Compared with traditional oxygen‑supply methods using liquid‑oxygen cylinders or cryogenic liquid‑oxygen storage tanks, industrial PSA/VPSA oxygen generators offer multiple advantages for industrial applications. These units produce oxygen on‑site, delivering it as needed without relying on external gas‑delivery systems, thereby eliminating the safety risks associated with high‑pressure tanks and cryogenic liquid‑oxygen storage and meeting the demands of continuous factory production. The equipment supports fully automated 24/7 operation, with oxygen purity, flow rate, and pressure precisely adjustable to suit various fermentation processes, making it well suited for diverse product lines and operating conditions.

From an operational‑cost perspective, on‑site oxygen generation eliminates the expenses associated with liquid‑oxygen procurement, transportation, tank rental, and evaporation losses, resulting in a substantial reduction in overall gas‑consumption costs. Moreover, a stable supply of oxygen-enriched air enables optimization of fermentation process parameters, lowers energy consumption for mixing and aeration, reduces the use of antifoaming agents and raw‑material losses, and enhances both the economic efficiency and operational stability of the production line.

VII. Conclusion

In the biofermentation industry, capacity upgrades and quality optimization hinge on the standardization and precise control of oxygen‑supply processes. Industrial oxygen generators deliver enriched oxygen in a precise, stable, and cost‑effective manner, overcoming the dissolved‑oxygen limitations of conventional aeration techniques and seamlessly supporting a wide range of aerobic fermentation applications across sectors such as pharmaceuticals, food, animal feed, and bioagriculture. Amid industry trends toward scale, standardization, and energy efficiency, on‑site industrial oxygen‑generation equipment has become a critical ancillary system for enhancing production quality and efficiency while reducing costs and resource consumption.