TCCA, namely trichloroisocyanuric acid, is a common chlorine-based disinfectant. Due to its high efficiency and stability, it is widely used in swimming pool disinfection, drinking water treatment, medical and health care, public environment disinfection and emergency water purification, etc. Whether it is the disinfection of drinking water in developing countries or the cleaning of family swimming pools in Europe and America, TCCA disinfectants play an important role.
You may like: What is TCCA and How is it Really Used?
However, as a strong oxidant, TCCA, apart from its "highly efficient sterilization", also poses certain risks of chemical reactions. If stored and transported improperly, it may decompose due to moisture or heat, generating toxic gases such as chlorine, and even causing fire and explosion accidents. As global attention to public health and water security increases, the usage of TCCA disinfectants continues to grow. This means that more attention must be paid to its safety management issues.
Review of TCCA Disinfectants and Bio-Lab Fire Accidents
In September 2024, a severe fire and toxic plume broke out at Bio-Lab facility in Conyers, Georgia, USA, involving a large amount of disinfection chemicals such as trichloroisocyanuric acid (TCCA), sodium dichloroisocyanurate (SDIC), and BCDMH. When these water-reactive chemicals were exposed to moisture, they decomposed rapidly, releasing chlorine gas and hydrogen chloride fumes, which fueled the fire and created a toxic plume.
As a result, local authorities implemented extensive emergency measures, including temporary evacuations, school closures, and traffic control. While investigations continue, this event serves as a reminder to the industry of the importance of proper chemical storage and risk management - not only for TCCA but for all reactive disinfectants.
For more details, you can refer to: U.S Chemical Safety Board Releases Investigation Update into September 2024 Massive Fire and Toxic Plume at Bio-Lab Facility in Georgia
TCCA disinfectants properties and storage risks
TCCA is a stable and highly efficient disinfectant, but why did it lead to such a serious accident? Understanding the chemical nature of TCCA is key to preventing similar hazards.
Physical properties
TCCA is white crystalline powder, which has a strong "chlorine odour", and is sometimes sold in tablet or granule form for domestic and industrial use. It's widely used as a solid disinfectant.
Characteristics of chemical reactions
- Moisture reaction: TCCA disinfectants will decompose in a humid environment, generating hypochlorous acid and chlorine gas.
- High-temperature decomposition: Under fire or high-temperature conditions, the reaction intensifies, releasing a large amount of hydrogen chloride.
- Contact with organic substances: When in contact with flammable organic substances, TCCA disinfectants may cause explosive combustion.
Superimposed with the risks of SDIC
SDIC is similar in nature to TCCA and is often stored simultaneously. If both decompose simultaneously in an accident environment, the toxic gas released will be more intense and the fire will be more difficult to control.
Lessons for TCCA Disinfectants Storage Safety
Incidents like the Bio-Lab fire demonstrate that when large quantities of reactive disinfectants are stored in the same area, the complexity of management and the potential safety risks increase significantly. If possible, it's better to use separate and smaller storage areas to reduce the impact in case of an emergency.
Another key takeaway is the importance of preventing moisture intrusion. According to reports, the fire began the morning of Sept. 29 after products stored inside a warehouse became wet, sparking the initial blaze.
What we need to understand is that TCCA and SDIC disinfectants themselves are not flammable materials, but they will decompose and release a large amount of heat when exposed to water, thereby indirectly igniting the surrounding flammable materials. The accident occurred at 5 a.m. and the open flame didn't appear until 6:30 a.m., further confirming that it was caused by the gradual accumulation of heat and eventually igniting other substances.
For more details, you can refer to:
Chemical Safety Board says BioLab fire grows 'more disturbing' as new issues come to light
Report reveals new details about BioLab chemical plant fire
Industry advice on TCCA disinfectants storage security
In light of this accident, we have realized that the storage and management of TCCA disinfectants are of vital importance. The following are the storage recommendations for TCCA:
Sealing and moisture-proof isolation
- Use dedicated moisture-proof containers or packaging to ensure that TCCA disinfectants does not come into contact with moisture during transportation and storage.
- The floor inside the warehouse should be kept dry to prevent water accumulation or leakage pipes from approaching the chemical storage area.
- Regularly inspect the packaging and containers. Replace them immediately if any damage or moisture is found to prevent minor problems from escalating into major accidents.
Reasonable Storage Quantity and Segmentation
- The larger the storage quantity of TCCA disinfectants, the more complex the monitoring and management becomes. To reduce risk concentration, stocks should be distributed across different storage areas.
- Separate batches of TCCA disinfectants by production date and shelf life to enable first-in, first-out inventory rotation.
Real-time environmental monitoring
- Install temperature and humidity sensors to monitor the warehouse environment 24 hours a day.
- The system is set with threshold alarms to automatically notify the management personnel when the humidity or temperature exceeds the safe range.
- By integrating Internet of Things technology, remote monitoring and data recording can be achieved, providing a basis for accident tracking and safety management.
Optimize the fire protection system
- Class B dry powder fire extinguishers, inert gas or carbon dioxide fire extinguishing equipment can be configured to extinguish surrounding fires.
- Regularly inspect fire protection facilities to ensure that the alarm system, sprinklers and fire extinguishing equipment are in good condition and effective.
Personnel training and emergency drills
- Employees must be familiar with the physicochemical properties and potential hazards of TCCA disinfectants.
- Regularly conduct emergency drills for leakage, fire, toxic gas release, etc., to enhance practical operation capabilities.
- Establish emergency evacuation routes and norms for the use of protective equipment to ensure that employees can quickly take refuge in the event of an accident.
Regulatory compliance and third-party auditing
- When storing reactive chemicals, keep them properly separated, clearly labeled, and avoid stacking them too high or too close together. Separating incompatible chemicals and controlling stacking height can help reduce the risk of unwanted reactions caused by accidental spills or high humidity.
- Comply with OSHA, CSB or local chemical storage standards to ensure that warehouse operations are legal and compliant.
- Regularly invite third-party safety assessment agencies to conduct risk audits, identify potential hazards and propose improvement plans.
- Record all data on safety inspections, maintenance, training and emergency drills to provide a basis for internal management and regulatory inspections within the enterprise.
Safety culture construction
- Enterprises should advocate the concept of "safety first" and incorporate chemical safety into their daily management and assessment.
- Employees should proactively identify and report potential risks, and management should promptly follow up and rectify them.
- Regular safety training and knowledge update courses are held to enhance overall risk awareness.
Conclusion
TCCA, as a widely used disinfectant, plays a significant role in safeguarding public health. However, the coexistence of efficient application and high-risk characteristics means that its storage and management must follow higher standards.
The Bio-Lab fire in Georgia highlights the importance of global chemical storage safety. Companies and institutions that handle TCCA disinfectants can use this incident as a reference to strengthen storage condition monitoring, risk assessment, and emergency response procedures. By following best practices, TCCA can continue to support public health without compromising safety.