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Installation of continuous sterilization of nutrient media

The Continuous Sterilization Unit is a technological complex designed for the thermal treatment of nutrient media using the HTST (High Temperature Short Time) method, bypassing the need for traditional autoclave loading. The equipment ensures the sterilization of liquid media in a continuous flow at temperatures of 140-150°C with minimal exposure time. It is primarily utilized in biotechnological manufacturing for preparing fermentation media, microbiological research, and inoculation complexes.

Operating Principles

The unit functions as a synchronized system of pipelines and heat exchange modules through which the nutrient media is transported at a calculated flow rate. Sterilization is achieved via two primary technologies:

  • Direct Steam Heating: Saturated steam is injected directly into the media flow. Temperatures of $140-150$°C are reached with a residence time of $30-120$ seconds. This method ensures rapid temperature elevation and uniform heat distribution.

  • Indirect Heating: Stepwise thermal treatment through plate or tubular heat exchangers. The process includes pre-heating, steam sterilization, and controlled cooling with heat recovery.

The system provides high throughput while minimizing thermal degradation of thermolabile components. Heat regeneration efficiency can reach 90%, significantly reducing energy consumption.

Construction and Engineering

  • Feed System: Utilizes frequency-controlled centrifugal pumps and precision dosing blocks to maintain constant flow and pressure.

  • Heating Module: Configured for either direct steam injection or indirect heat exchange. Steam injectors provide instantaneous heating, while plate/tubular exchangers allow for gradual heating to preserve media structure.

  • Holding Zone: An insulated pipeline of calculated length that ensures the required exposure time at the sterilization temperature. The design eliminates stagnant zones and maintains turbulent flow.

  • Cooling System: Employs regenerative heat exchange with the incoming flow and vacuum flash cooling, ensuring rapid temperature reduction without microbial contamination.

  • Control System: Based on PLC (Programmable Logic Controllers) with continuous monitoring of temperature, pressure, and flow, featuring automatic process parameter correction.

Performance and Technical Parameters

Standard units provide a capacity ranging from 500 to 40,000 L/h. The system is adapted for media with viscosities up to 200 mPa·s, including agar solutions, protein complexes, and multi-component formulations.

The automation system maintains and records $F_0$ and $R_0$ parameters to ensure sterilization process validation according to pharmacopeial requirements.

Regulatory Compliance

The units are designed and validated in accordance with:

  • ISO 11134: Validation and routine control of sterilization for health care products.

  • ISO 11737-1/2: Microbiological methods for validation.

  • cGMP & US FDA 21 CFR Part 11: For electronic records and pharmaceutical production standards.

  • GOST R 57095-2016: General technical requirements for continuous sterilization units.

Advantages

  • Media Integrity: Minimal thermal damage preserves the activity of vitamins, amino acids, and growth factors.

  • Efficiency: High throughput combined with 90% heat recovery.