Are water treatment chemicals hazardous?

      In the current era where industrial production is closely linked to daily life, water treatment chemicals are widely used in various fields such as municipal sewage treatment, industrial wastewater treatment, and seawater desalination as key elements to ensure water quality safety and improve water resource utilization efficiency. However, with the continuous deepening of public awareness of chemical safety, whether water treatment chemicals are hazardous has become a focus of attention from all sectors of society.

      Water treatment chemicals are the core materials for ensuring drinking water safety, industrial water circulation, and meeting sewage treatment standards, but their chemical properties determine the potential hazards of some products. This article systematically analyzes the safety of water treatment chemicals from three aspects: risk classification, management measures, and industry practices.

1. Hazard classification of water treatment chemicals

      1. Corrosive chemicals

      (1) Representative substances: hydrochloric acid, sodium hydroxide, aluminum sulfate
      (2) Risk characteristics: Strong acid/alkali chemicals can damage human tissues, contact with skin or eyes can cause burns, and inhalation of vapors can damage the respiratory tract.

      (3) Application scenario: Mainly used for pH adjustment, precipitation reaction, and equipment cleaning, accounting for 25% of the industrial water treatment chemical usage.

      2. Toxic chemicals

      (1) Representative substances: sodium hypochlorite, liquid chlorine, heavy metal salts (such as copper sulfate)
      (2) Risk characteristics: Chlorine gas produced by the decomposition of sodium hypochlorite has strong irritants, and concentrations exceeding 1ppm can cause coughing and tearing; Leakage of liquid chlorine can cause suffocation poisoning, with a mortality rate of 100% when exposed to 1000ppm environment for 30 minutes.

      (3) Application scenarios: Disinfectants, algaecides, and heavy metal precipitants account for 40% of the municipal water treatment chemical usage.

      3. Flammable and explosive chemicals

      (1) Representative substances: hydrogen peroxide (hydrogen peroxide), ozone generator
      (2) Risk characteristics: Mixing 30% concentration hydrogen peroxide with organic matter may cause an explosion, while ozone concentration exceeding 0.1ppm in a confined space poses an explosion risk.

      (3) Application scenario: Oxidants in advanced oxidation processes, accounting for 10% of industrial wastewater treatment usage.

      4. Chemicals with environmental hazards

      (1) Representative substances: phosphorus containing scale inhibitors, non-ionic surfactants
      (2) Risk characteristics: Excessive discharge can lead to eutrophication of water bodies and trigger algal outbreaks; Some surfactants have poor biodegradability and accumulate to form persistent pollution in the environment.

      (3) Application scenarios: Scale inhibitors, dispersants, and cleaning agents, accounting for 20% of the circulating water treatment usage.

2. Risk management measures

      1. Storage and transportation regulations

      (1) Classified storage: Corrosive chemicals need to be stored in a separate warehouse and kept at a distance of more than 10 meters from combustibles; Toxic chemicals are stored in double sealed containers and equipped with leak collection devices.

      (2) Temperature control: The storage temperature of hydrogen peroxide should be below 25 ℃, and a forced ventilation system should be installed in the liquid chlorine warehouse to ensure that the chlorine concentration is below 0.5ppm.

      (3) Transport identification: Paste corrosive, toxic or flammable signs according to the "Regulations for Road Transport of Dangerous Goods", and equip with leak proof pallets and emergency response kits.

      2. Operational safety regulations

      (1) Personal protection: Wear acid and alkali resistant gloves, protective face shields, and chemical protective clothing when in contact with corrosive chemicals; Positive pressure air respirators and gas masks are required for handling toxic chemicals.
      (2) Process control: Automated dosing system reduces manual contact, sets up online monitoring of pH and residual chlorine, and automatically shuts down when exceeding limits.

      (3) Emergency response: Develop an emergency plan for leaks, equipped with neutralizing agents (such as sodium bicarbonate for acid leaks), adsorbent materials (such as diatomaceous earth for oil leaks), and emergency medicine.

3. Industry Practice and Trends

      1. Development of green alternatives

      (1) Phosphorus free scale inhibitor: Bio based scale inhibitors such as polyaspartic acid can replace phosphorus containing products to reduce the risk of eutrophication in water bodies. The market share is expected to reach 30% by 2025.

      (2) Low toxicity disinfectant: The chlorine dioxide generator replaces liquid chlorine, reducing toxicity by 80% and producing no disinfection by-products such as trihalomethanes.

      2. Intelligent management upgrade

      (1) IoT monitoring: Real time monitoring of temperature, pressure, and concentration of chemical storage tanks through sensors, and automatic triggering of alarms for abnormal data.
      (2) Blockchain traceability: Establish a chemical lifecycle traceability system to record data on production, transportation, use, and disposal processes, ensuring compliance.
The hazards of water treatment chemicals stem from their chemical nature, but through scientific classification, strict management, and technological innovation, the risks are completely controllable. The industry is developing towards green and intelligent direction. The application of new low toxicity products and intelligent monitoring systems will further enhance the safety of water treatment processes and provide guarantees for the sustainable utilization of water resources.