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Recently, a certain hospital's sewage biochemical system was abnormal, resulting in an abnormal increase in COD and ammonia nitrogen concentrations in the influent. Chlorine dioxide was consumed in large quantities, and the disinfection effect sharply decreased, sounding the alarm for the safe treatment of hospital sewage.
In the hospital sewage treatment system, abnormal biochemical system can lead to an abnormal increase in COD (chemical oxygen demand) or ammonia nitrogen concentration in the influent, which not only impacts the biochemical treatment unit, but also causes serious problems in the subsequent disinfection process - chlorine dioxide is consumed in large quantities, the disinfection effect drops sharply, and may lead to excessive discharge of pathogenic microorganisms, bringing environmental and public health risks.
Chlorine dioxide consumption mechanism: correlation between abnormal water quality and disinfection efficiency
When the concentration of pollutants such as COD and ammonia nitrogen in sewage increases abnormally, these reducing substances will undergo redox reactions with chlorine dioxide, consuming a large amount of chlorine dioxide and resulting in insufficient concentration of chlorine dioxide available for sterilization.
More seriously, high concentrations of organic matter and ammonia nitrogen themselves can form a certain protective effect on pathogenic microorganisms, reducing the bactericidal efficiency of disinfectants. In this case, pathogenic microorganisms such as bacteria and viruses in sewage may not be effectively inactivated and discharged with the effluent, causing environmental pollution and disease transmission risks.
Emergency measures: Multi level barriers to ensure safe discharge of sewage
In the face of such emergencies, hospital sewage treatment plants should take the following emergency measures:
1. Source control and process adjustment
Immediately investigate and cut off the source of abnormally high concentration sewage to prevent further deterioration of the pollution situation. At the same time, adjusting the operating parameters of the biochemical system, increasing the reflux ratio, increasing the aeration rate, improving the removal efficiency of organic matter in the biochemical system, and reducing the pollutant load entering the disinfection unit from the source.
2. Supplement the dosage of disinfectant
Quickly monitor the residual chlorine dioxide level, increase the chlorine dioxide dosage in a timely manner according to the water quality situation, and ensure that the outlet of the disinfection contact tank maintains sufficient residual chlorine concentration. In general, the contact time should be no less than 30 minutes, and the residual chlorine content should be greater than 0.5mg/L.
3. Activate backup disinfection facilities
Activate emergency backup disinfection equipment, such as using a backup chlorine dioxide generator or switching to an emergency disinfection system with multiple disinfection barriers such as UV disinfection, ozone disinfection, etc., to ensure disinfection effectiveness.
4. Add auxiliary disinfectant
On the basis of chlorine dioxide disinfection, auxiliary disinfectants such as sodium hypochlorite and bleach powder are added as temporary emergency measures to enhance the overall disinfection ability and ensure effective inactivation of pathogenic microorganisms.
5. Strengthen water quality monitoring
During the emergency period, increase the frequency of water quality monitoring and monitor key indicators such as COD, ammonia nitrogen, residual chlorine, and fecal coliforms at the inlet and outlet of the influent, biochemical tank effluent, and disinfection tank every hour to real-time grasp the treatment effect and guide process adjustments.
6. Emergency emission control
If the disinfection effect continues to fail to meet the standard, consideration should be given to temporarily storing the effluent in the emergency pool or returning it to the regulating pool to avoid direct discharge of substandard sewage. If storage is not possible, emergency discharge measures can only be taken after reporting to the environmental protection department and obtaining permission.
Long term mechanism: prevention before it happens
Emergency measures are certainly important, but establishing a long-term mechanism is fundamental:
Optimize sewage treatment process design and reserve sufficient treatment capacity;
Install online monitoring equipment to achieve real-time monitoring of key indicators such as COD, ammonia nitrogen, and residual chlorine dioxide;
Establish a preventive maintenance system for equipment, regularly inspect biochemical systems and disinfection equipment;
Strengthen source control, classify and manage the drainage of various departments in the hospital, and prevent high concentration wastewater from directly entering the sewage treatment system.
Hospital sewage disinfection is an important line of defense for public health and safety. In the face of disinfection crises caused by abnormal biochemical systems, we need to take effective emergency measures immediately and take multiple measures to ensure disinfection effectiveness. At the same time, it is necessary to establish a sound long-term mechanism to prevent problems before they occur. Only in this way can we firmly guard this invisible security line and protect the health of the people and the safety of the environment.
Chlorine dioxide kills bacteria through multi-target oxidation, and theoretically, it is unlikely to produce drug-resistant bacteria. However, long-term sublethal low-dose disinfection of wastewater systems can screen out resistant microorganisms, leading to bacterial succession. In such cases, it may be necessary to increase CT disinfection parameters to achieve the desired disinfection effect. The risk of increased microbial tolerance and the effectiveness of hospital wastewater disinfection can be mitigated by ensuring sufficient dosage and contact time, avoiding prolonged low-dose operation, combining UV/ozone disinfection, proper wastewater pretreatment, and regular monitoring of water quality microorganisms.
When chlorine dioxide is used to disinfect hospital wastewater, short-circuiting and disinfection dead zones can easily occur due to the short half-life of the agent. A three-stage mixing process, consisting of pipeline premixing, inlet enhanced mixing, and in-tank flow guidance, combined with an online intelligent control system and standardized equipment selection and daily operation and maintenance, can be used to achieve rapid and uniform distribution of chlorine dioxide in wastewater and ensure the disinfection effect of hospital wastewater.
When hospital wastewater is disinfected with chlorine dioxide, pH directly affects the disinfection effect. The pH needs to be maintained within the range of 6.0–8.5. Water quality is controlled through monitoring, intelligent dosing, and coordinated regulation of upstream processes to ensure stable discharge compliance and save operating costs.
Excessive ammonia nitrogen in hospital wastewater stems from four main issues: pretreatment, biochemical processes, water volume, and process technology. This article provides a complete solution encompassing pretreatment, biochemical optimization, advanced treatment, and emergency nitrogen reduction, balancing stable compliance with operating costs, and simultaneously promoting solutions from chlorine dioxide disinfectant manufacturers.
Abnormalities in hospital wastewater biochemical systems can lead to elevated COD and ammonia nitrogen levels, excessive consumption of chlorine dioxide causing disinfection failure, and posing a risk of pathogen leakage. This article introduces six emergency response measures and a corresponding long-term management plan to ensure wastewater meets discharge standards and safeguard public health and environmental safety.
The hospital's wastewater met the residual chlorine standard but exceeded the fecal coliform count standard. The core reason was that suspended particles masked pathogens. This can be resolved by strengthening pretreatment to remove particles, using a combination of ultraviolet and chlorine dioxide disinfection, and implementing corresponding maintenance, inspection, and multi-indicator monitoring and control.
Hospital sludge belongs to HW01 hazardous waste, and traditional treatment processes have high costs, poor disinfection effects, and continuously increasing disposal pressure. Xiuba achieves harmless reduction of sludge through four core technologies, and intelligent control balances safety and cost.
The by-products generated by chlorine dioxide treatment of hospital sewage can harm the ecology of sensitive water bodies, and there are shortcomings in conventional monitoring. The use of graded monitoring combined with process optimization can effectively control by-products and safeguard water environment safety.
Chlorine dioxide, as a highly efficient and strong oxidant, produces no chlorinated organic byproducts and does not generate carcinogens. It can effectively remove phenols, cyanides, sulfides, and heavy metal ions from industrial wastewater, and has excellent decolorization and COD reduction effects. It is also suitable for drinking water disinfection, aquaculture water purification, and air and equipment deodorization and formaldehyde removal. It has a wide range of applications, low cost, and outstanding environmental value.
In the United States, the disinfection methods for hospital sewage treatment are mainly divided into two categories: one is the disinfectant prepared on-site, such as sodium hypochlorite generator and chemical chlorine dioxide dosing device;
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