Hospital medical wastewater contains a significant amount of suspended solids, pathogenic microorganisms, and other pollutants. Therefore, it is necessary to use physical and chemical processes to remove these pollutants as much as possible in the early stages. Otherwise, it will affect the operation and management effectiveness of the entire processing system. Therefore, this plan proposes to install a grille before the sewage enters the biochemical treatment system to remove suspended solids in the water.
Due to the low CODCr content and good biochemical effect of sewage, in order to reduce investment, lower operating costs, and enhance the system's ability to withstand impact loads, this plan adopts the "anaerobic+aerobic" treatment method for sewage biochemical treatment.
Medical wastewater is first treated through a grid groove to remove suspended solids and other impurities in the water, preventing blockages in subsequent treatment processes and causing blockages in waterways, which can affect system operation. The sewage filtered by the grid flows automatically into the regulating tank, which is a structure for regulating and homogenizing the sewage volume. Due to the uneven discharge of sewage during the day and night, and the large coefficient of variation over time, the regulating tank is designed for regulating the sewage volume. To ensure the balanced operation of the subsequent treatment system and minimize the impact of sewage shock load, in order to achieve the desired treatment effect, it is necessary to set up a regulating tank to adjust and homogenize the sewage volume, so that the regulating tank lift pump always supplies water to the subsequent treatment system according to the average treatment volume. Data statistics show that the effective volume of the regulating tank is calculated based on 6-10 times the average hourly treatment capacity. Two sewage lifting pumps are installed at the end of the pool to lift water to the integrated sewage treatment equipment, one in use and one as backup. The operation of the lift pump is controlled by the liquid level float. When the water level in the regulating pool is at a high level, the water pump automatically starts; When the liquid level is low, the water pump automatically stops.
The effluent from the regulating tank flows automatically into the anaerobic tank. Anaerobic hydrolysis acidification biological treatment of sewage is a treatment method that uses the degradation effect of anaerobic microorganisms to purify organic matter in sewage under anaerobic or hypoxic conditions. Under anaerobic conditions, anaerobic bacteria in wastewater decompose organic compounds such as carbohydrates, proteins, and fats into organic acids. Then, under the action of methane bacteria, they further ferment to form methane, carbon dioxide, and hydrogen, thereby purifying the wastewater. After hydrolysis and acidification treatment, the difficult to degrade organic compounds in water can be converted into easily degradable organic compounds in small molecules, thereby improving the treatment efficiency of subsequent aerobic treatment units. The use of hydrolysis acidification process can greatly shorten the time required for aerobic biochemistry; After simultaneous treatment, the effluent quality is better, which not only saves investment and operating costs, but also improves environmental benefits.
The effluent from the anaerobic tank flows automatically into the new contact oxidation unit. Biological packing is a combination of packing materials on a fixed bed. Using fillers as attachment carriers for microorganisms. The organisms are evenly distributed on the biological packing, which avoids the phenomenon of uneven distribution of microorganisms. At the same time, the organisms adhere to the surface of the packing and do not flow with water. Due to the strong agitation of the rising airflow, the biofilm is constantly renewed, thereby improving the purification effect. The infiltration filter method has the advantages of short treatment time, small volume, good purification effect, good and stable effluent quality, no need for sludge reflux or expansion, and low power consumption. (The content is for reference only)
