Disinfection of Portable Toilets at Construction Sites

The disinfection methods for portable toilets at construction sites mainly include physical disinfection and chemical disinfection. Specific operations should follow norms such as conducting disinfection during non-use periods, wearing protective gear, and ensuring residual concentrations meet standards.

Physical Disinfection Methods

1. High-Temperature Disinfection: Utilize a steam generator to produce high-temperature steam (usually exceeding 100°C) and spray it on surfaces such as toilets, sinks, and squatting positions for 3-5 minutes. High temperatures can destroy the protein structure of microorganisms, effectively killing bacteria, viruses, and parasite eggs. During operation, ensure that the steam covers all contact surfaces and avoid the risk of burns.
2. Ultraviolet Disinfection: When the toilet is unoccupied, turn on the ultraviolet disinfection lamp (wavelength 254nm) and irradiate for more than 30 minutes. Ultraviolet light inactivates microorganisms by destroying their DNA structure, but note the following:
   • Ultraviolet light cannot penetrate obstructions, so ensure the irradiation area is unobstructed.
   • Operators should ventilate for 10 minutes after disinfection before entering to avoid direct exposure of the skin or eyes.

Chemical Disinfection Methods

1. Chlorine-Based Disinfectants: Dilute chlorine-containing products such as 84 disinfectant in a 1:100 ratio and use a sprayer to thoroughly spray the floor, walls, and toilets. After 30 minutes of action, rinse with clean water. Chlorine-based disinfectants have a strong killing effect on intestinal pathogens and pyogenic cocci, but note the following:
   • Avoid mixing with acidic substances such as toilet cleaners to prevent the production of toxic chlorine gas.
   • After disinfection, rinse thoroughly to avoid residual corrosion of metals or skin irritation.
2. Peracetic Acid: Dilute to a concentration of 0.2%-0.5% and use it to wipe high-frequency contact areas such as door handles and handrails, or spray for air disinfection. Peracetic acid has strong oxidizing properties and can quickly kill spores and viruses, but it is corrosive. Operators should wear rubber gloves and goggles during operation.
3. Alcohol Disinfection: Soak a cloth with 75% medical alcohol and wipe small areas such as faucets and flush buttons. Alcohol is volatile and suitable for quick local disinfection, but keep it away from open flames and note its limited effect on spore-forming microorganisms.

Operation Norms and Precautions

• Timing Selection: Disinfection operations should be carried out after workers finish work or when the toilet is idle to avoid personnel contact with disinfectants.
• Protective Requirements: Operators should wear masks, gloves, and protective clothing to prevent chemical irritation or infection risks.
• Residue Control: After disinfection, test indicators such as residual chlorine to ensure compliance with the "Hygiene Indicators and Limit Requirements for Public Places" (GB 37488-2019) and avoid harm to users.
• Smart Assistance: Some portable toilets are equipped with automatic induction spray devices that release food-grade disinfectant after each use, covering contact surfaces such as toilet seats and door handles, reducing the frequency of manual operations.