Application of Ozone Generator in Hospital Sewage Treatment
1、 Overview of Ozone Disinfection
Ozone, with the molecular formula O3, has a special pungent odor and is internationally recognized as a green and environmentally friendly disinfectant. Ozone produces highly oxidizing single atom oxygen (O) and hydroxyl (OH) groups in water. Hydroxyl (OH) groups have a strong killing effect on various pathogenic microorganisms, while single atom oxygen (O) has strong oxidizing ability and has strong killing ability against various viruses and bacteria.
Ozone disinfection has fast response and low dosage; Strong adaptability, stable ozone disinfection performance within the pH range of 5.6-9.8 and water temperature range of 0-37 ℃; No secondary pollution; Can improve the physical and sensory properties of water, with decolorization and deodorization effects. But the disadvantages are the lack of continuous disinfection function, on-site production and use only, high cost of ozone disinfection equipment, and high power consumption.
Ozone preparation methods include corona discharge method, ultraviolet method, chemical method, and radiation method, and corona discharge method is generally used in engineering.
2、 Engineering Design
(1). The hospital sewage ozone treatment station should be equipped with an air compressor room, an ozone generator equipment room, and an operation room. The air compressor room should be equipped with air compressors that are shock resistant and noise resistant. There should be space for equipment maintenance between ozone generators. Ozone contact towers should be installed indoors in cold regions, and exhaust pipes should be installed to discharge the treated exhaust gas outdoors.
(2). The main process parameters for hospital sewage disinfection are shown in Table .
Main process parameters for ozone disinfection of hospital wastewater
(3). When choosing an ozone generator, the amount of ozone added should be determined based on the sewage quality and treatment process, and then the amount of ozone used should be determined based on the amount of ozone added and the amount of water treated per unit time. The number and model of ozone generators should be selected based on the amount of ozone used per hour.
(4). The contact between ozone and sewage is generally carried out by bubbling method. The smaller the dispersion of bubbles, the higher the utilization rate of ozone, and the better the disinfection effect. Therefore, it is necessary to choose an ozone intake device with good air water mixing effect.
(5). Ozone system equipment pipelines should undergo anti-corrosion treatment and sealing.
(6). Ventilation equipment should be installed in the ozone equipment room, and ventilation fans should be installed near the ground.
(7). Tail gas treatment or recovery devices must be installed at the end of the process, and the ozone tail gas discharged after the reaction must be decomposed, destroyed, or recycled to meet emission standards.
3、 Equipment features
(1). Small footprint and easy installation
(2). Automatic operation, simple operation, and no need for dedicated personnel to manage the entire system
(3). The system processing effect is stable and reliable
(4). Beautiful appearance, compact structure, easy to move
(5). The device can add negative pressure suction system or sewage lifting system according to the user's situation, without the need for civil engineering.
4、 Scope of application
(1). It is best to use ozone disinfection for hospital wastewater treated with secondary treatment, which can reduce the amount of ozone added and lower equipment investment and operating costs.
(2). High investment and operating costs, suitable for sewage treatment in infectious disease hospitals and comprehensive hospitals with high management level.
(3). Small and medium-sized community medical clinics, dental clinics, hospital outpatient clinics, beauty and body care units, and other units that require small-scale sewage treatment due to housing shortages.
(4). Medical examination center, disease control center.
