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The operation process of wastewater treatment plants is a complex and refined process, mainly including the following steps:
1、 Preparation work
Equipment inspection and maintenance: Operators need to inspect various equipment in the wastewater treatment plant, such as pumps, pipelines, valves, mixers, etc., to ensure that they are in good operating condition. For equipment that malfunctions, timely maintenance or replacement is necessary.
Preparation of chemical agents and testing equipment: Prepare necessary chemical agents such as coagulants, disinfectants, etc. according to the needs of wastewater treatment. At the same time, prepare various testing equipment such as dissolved oxygen meters, pH meters, etc. to ensure precise control during operation.
2、 Preliminary treatment of wastewater
Grid interception: Wastewater first passes through a grid, which is divided into coarse and fine grids, used to intercept large particles and suspended solids in the wastewater. These intercepted substances will be regularly cleaned up and transported away.
Sedimentation in sedimentation tank: The wastewater intercepted by the grid enters the sedimentation tank, and inorganic substances such as sand and gravel in the wastewater are precipitated by gravity. The design of the sedimentation tank helps prevent the wear and tear of sand and gravel on subsequent processing equipment.
Coagulation and sedimentation: For wastewater containing a large amount of suspended solids, it may be necessary to add coagulants for coagulation treatment, so that the suspended solids aggregate into larger particles, and then be removed by sedimentation in a sedimentation tank.
3、 Biological processing
Aeration tank and activated sludge process: Wastewater enters the aeration tank and mixes with activated sludge. Microorganisms in activated sludge can degrade organic matter in wastewater. The design of the aeration tank ensures that microorganisms in the wastewater can obtain sufficient oxygen for respiration.
Membrane bioreactor (MBR): In some advanced wastewater treatment plants, membrane bioreactors may be used for biological treatment. MBR combines biological treatment and membrane separation technology, which can more effectively remove organic matter and suspended solids from wastewater.
Monitoring and adjustment: Operators need to closely monitor various parameters in the biological treatment process, such as dissolved oxygen concentration, sludge concentration, etc., and adjust them according to the actual situation to ensure that the effluent quality meets the standard.
4、 Deep processing and emissions
Deep treatment method: After biological treatment, the wastewater may still contain some trace pollutants. At this point, it is necessary to use deep processing methods for further purification. Common deep processing methods include activated carbon adsorption, membrane separation, disinfection, etc.
Water quality monitoring: Prior to wastewater discharge, operators need to conduct water quality monitoring to ensure that the effluent meets discharge standards or reuse requirements. Water quality monitoring indicators usually include pH value, suspended solids (SS), chemical oxygen demand (COD), biological oxygen demand (BOD), ammonia nitrogen (NH3-N), total nitrogen (TN), total phosphorus (TP), etc.
Safe discharge: Ensure that wastewater is safely and compliantly discharged into the environment. For wastewater that needs to be reused, further purification and treatment are required to meet the water quality requirements for reuse.
5、 Operations Management and Maintenance
Daily inspection: Operators need to regularly inspect various equipment in the wastewater treatment plant to promptly identify and solve problems.
Regular maintenance and upkeep: For critical equipment, regular maintenance and upkeep are necessary to ensure its long-term stable operation.
Recording and Reporting: Operators need to keep detailed records of various data during the wastewater treatment process and regularly submit reports to relevant departments.
Emergency response: Develop emergency plans to deal with possible emergencies such as equipment failures, water quality exceeding standards, etc.
In summary, the operation process of wastewater treatment plants is a complex and intricate process that requires operators to possess rich professional knowledge and practical experience. Through scientific management and advanced technological means, the efficient and stable operation of wastewater treatment plants can be ensured, contributing to the protection of the environment and human health.
