Hospital wastewater is one of the most dangerous types of municipal wastewater. One of the most important problems of this type of wastewater is the existence of various types of pathogenic microorganisms that can cause a variety of diseases in the community by discharging them without environmental treatment. In addition, due to the high organic load of this type of wastewater, this problem creates environmental problems if discharged to the environment.
Considering the potential of such hazards in hospital and health centers wastewater and sewage, it is essential to use a proper wastewater treatment system. Using hospital wastewater treatment package is one of the most cost-effective and convenient solutions for hospital wastewater treatment.
Hospital wastewater treatment often uses a variety of aerobic treatment processes such as extensive aeration process, MBBR process wastewater treatment, MBR process wastewater treatment, USBF process wastewater treatment, and so on. Due to the variety of pathogens and the pathogen organisms, precise disinfection of these types of wastewater is very important.
The wastewater produced by hospitals is more complex than conventional municipal wastewater. So it will be even more complicated to clean. Large hospitals, with a large number of patients and laboratories, laundry, which all produce a significant amount of toxic wastewater. Such wastewater, which is rich in various organic matter, cannot be recycled by a simple biological process, as it contains contaminants that impede the biological treatment process.
Generally, hospital wastewater contains the following contaminants:
- Microbial pathogens and harmful bacteria and viruses
- Different Types of drugs and their metabolites
- Radioactive isotopes
- Hazardous chemicals, heavy metals
- Waste of medicines
Hospital wastewater treatment steps
The treatment process is performed in a hospital sewage treatment system as a series of steps. The following are the conventional treatment processes used to remove all types of hospital contamination.
Initial or Pre-Treatment step: As a first stage, the primary treatment process is required in all wastewater treatment plants (STPs). This phase eliminates items such as wood, plastics and other scrap and minerals. By doing this step, the equipment of the treatment system is protected from damage. All of this waste is collected in the waste disposal tank of the treatment plant.
Primary treatment step: This is the second stage in the sewage treatment system. Physical separation of solids and fats and oil from sewage is done at this stage. At this point, water flows to the primary filters or clarifiers for several hours so that the solid particles can settle down and lighter particles move upward and separate from the tank. The resulting solid material as the primary sludge or primary effluent contains about 60 to 70 percent of the solids. The treated wastewater will now enter the next phase of the process.
Secondary treatment step: This is a biological treatment process that removes dissolved inorganic solids and colloidal material in the wastewater. Here, bacteria transform colloidal and soluble minerals. The treated wastewater is now transferred from the original tank to the aeration tank and oxygen is supplied to the microbes through the aeration system. When the wastewater flows to the secondary purification, the solids are deposited and called secondary sludge, part of which is recycled for the activated sludge process, and the remainder is mixed with the primary sludge, which is sent to the sludge digestion tank, and then it is repelled. This step eliminates about 90% of the inorganic solids.
Third step or advanced treatment: This is the last stage in many hospital treatment packages. At this stage, suspended solids and organic matter that are not eliminated in the secondary treatment phase are removed. Pathogenic microorganisms that were not eliminated during the biological treatment process are eliminated by a process called disinfection. Several disinfectants can be used depending on sewage conditions (pH, clarity, etc.). This is achieved through the use of physical and chemical disinfectants such as chlorine, UV radiation, ozone, and so on. Disinfected sewage is now suitable for disposal or reuse.
Farab Zist Faraz Co. is actively building hospital wastewater treatment packages
Given the high sensitivity of the wastewater treatment of hospitals and medical centers, it is very important to utilize the services of companies that have sufficient experience in this field. Farab Zist Faraz Co. with sufficient experience in designing and manufacturing hospital wastewater treatment package and utilizing modern technologies and relying on the expertise of its experts in designing, manufacturing, supplying equipment and maintaining various types of hospital wastewater treatment packages, is actively working in this field. The company has carried out several projects to design and build a hospital sewage treatment system in Iran and Iraq. Among the benefits of the packages and hospital wastewater treatment systems manufactured by the company are the high purification efficiency, the least need for operation and guidance and the small dimensions and optimal use of space. Please contact us for more information.