When designing hospital wastewater treatment equipment, the right process is critical to improving treatment effectiveness and reducing operating costs. This tutorial will introduce you to the process selection of hospital sewage treatment equipment from the perspective of experts.
The primary treatment process is typically used to remove solids and suspended matter from wastewater and purify the quality of wastewater. Common primary treatment processes include:
Screen filtration: Screens are used to filter out larger objects in the sewage to prevent clogging of equipment.
Sedimentation tank: By slowing down the flow rate and increasing the water section, the suspended solids can be precipitated to the bottom to achieve the purpose of preliminary removal of impurities.
2.Intermediate treatment process.
The intermediate treatment process is mainly used to remove organic matter and nutrients from the effluent, and to reduce the chemical oxygen demand (COD) and ammonia nitrogen content in the water body. Common intermediate treatment processes include:
Activated sludge method: The organic matter in the sewage is decomposed by adding activated sludge, and the oxidation reaction is carried out in the contact tank to achieve the purpose of degrading COD and ammonia nitrogen in the sewage.
Biological filter: The surface of the filter material and the biofilm inside the filter material are used to treat sewage and degrade organic matter.
3.Advanced processing process.
Advanced treatment processes are mainly used to further improve water quality and achieve higher effluent standards. Common advanced treatment processes include:
Activated carbon adsorption: Activated carbon adsorbents are used to remove organic matter and some heavy metal ions in water to improve water quality.
Membrane separation technology: The microporous structure of the membrane is used to realize the interception of microorganisms, suspended solids and dissolved substances in the water body, and obtain more purified water quality.
4.Disinfection process.
The disinfection process is mainly used to kill bacteria, viruses and other pathogenic microorganisms in the water and ensure that the effluent meets hygienic standards. Common disinfection processes include:
Liquid chlorine disinfection: Liquid chlorine is added to sewage to kill bacteria and viruses.
Ultraviolet disinfection: Ultraviolet irradiation is used to irradiate sewage to destroy the DNA structure of bacteria and viruses to achieve the purpose of disinfection.
5.Phosphorus and nitrogen removal process.
The phosphorus and nitrogen removal process is mainly used to remove phosphorus and nitrogen from sewage to prevent eutrophication of water bodies and reduce pollution to the water environment. Common phosphorus and nitrogen removal processes include:
Biological contact oxidation method: By contacting the wastewater with a high concentration of oxygen-containing biological sugar solution, the special microbial flora in the biofilm sugar solution is used to biodegrade nitrogen and phosphorus.
EBPR process: sodium phosphate is used to control the aeration conditions and sludge concentration, and the phosphorus-containing waste is converted into intracellular compound precipitation through the mixed solution anoxic culture method.
Summary. The process selection of hospital sewage treatment equipment needs to comprehensively consider the special sewage composition of the hospital and the requirements of effluent standards. According to the actual situation of hospital sewage and the treatment effect that needs to be achieved, the key to ensure the normal operation of sewage treatment equipment and water quality standards is to select suitable primary, intermediate and advanced treatment processes, as well as disinfection and phosphorus and nitrogen removal processes.