Drinking Water

Chlorine dioxide can efficiently disinfect drinking water, is not easy to generate carcinogenic disinfection by-products, and will produce chlorite and other residues, which must comply with the national standard limits. It shall be accurately added according to the water quality and equipped with qualified equipment and process. The safety of compliant use is high. Water supply enterprises need to do a good job in control and monitoring to ensure the safety of water quality.

Chlorine dioxide is a who Certified grade A1 safe disinfectant with high sterilization efficiency, few harmful by-products, strong water quality adaptability and multiple water purification functions; Compared with traditional chlorine disinfection, it is safer and more environmental friendly, and can be widely used in drinking water, sewage treatment, food and beverage disinfection and other fields.

Chlorine dioxide can sterilize and remove odors in water treatment plants and is unlikely to generate trihalomethanes. However, in practical applications, it can fail to remove odors or even produce new unpleasant smells. Organic matter in the water source, bromide ions, and low temperatures can affect treatment effectiveness. Furthermore, its removal capacity for geosmin and 2-methylisoborneol is limited, and improper dosage can also cause odor problems. Water treatment plants need to strengthen water quality monitoring, dynamically adjust dosages, and, when necessary, combine ozone-activated carbon processes to ensure that the odor of the treated drinking water meets standards.

When adding chlorine dioxide to the water pumping station to maintain residual chlorine in the pipeline network, it is necessary to avoid pipeline corrosion caused by local high concentrations. The dosage should be accurately controlled by flow-linked dosing, pipeline mixing, and online residual chlorine monitoring, while also paying attention to under-scale corrosion, thus balancing disinfection and pipeline protection.

Pipeline network renovations can easily alter the hydraulic conditions of the network, increasing flow velocity and creating stagnant zones that consume chlorine dioxide, leading to fluctuations in water quality. Water plants can ensure the quality of water supplied to the end points through monitoring and prediction, dynamic chemical dosing, pipeline flushing, and the activation of contingency plans.

Traditional chlorine disinfection is prone to producing carcinogenic halogenated by-products; chlorine dioxide oxidizes and kills bacteria, with almost no such by-products, good inactivation effect, and the ability to remove odor and inhibit algae, but it generates by-products such as chlorite, requires higher raw material and operation and maintenance costs, and is suitable for water plants that can be upgraded and managed in a coordinated manner, rather than being simply and directly replaced.

This study simulates a scenario where a small town's water plant experiences a sudden pollution outbreak caused by medical wastewater and the failure of chlorine dioxide disinfection. It analyzes the reasons why pollutants consume disinfectant and provides four-step emergency response measures. Furthermore, it proposes long-term improvement suggestions in terms of monitoring, supplies, contingency plans, and drills to enhance the emergency response capabilities of small and medium-sized water plants.

Switching from sodium hypochlorite to chlorine dioxide disinfection in water plants is not just about replacing equipment; it's a complete system upgrade. Chlorine dioxide disinfection is more effective, produces fewer byproducts, and has lower overall costs. However, many water plants only replace the hardware, neglecting personnel training and adapting management systems. The core of this transformation is shifting from experience-based to scientific operation.

The actual dosage of chlorine dioxide at water treatment plants often exceeds the theoretical value, influenced by factors such as reducing agents in the water, sediment in the pipe network, water quality fluctuations, and byproduct consumption. By leveraging monitoring and local operational data to optimize dosage, we can provide water quality assessments and customized dosage solutions.