What are the basic unit technologies for advanced urban sewage treatment? [Daily question 090221]
Thread Content
What are the basic unit technologies for advanced urban sewage treatment? You can tell me what you know. This post was last edited by lyhh9024 on 2009-2-21 15:21 ]
The unit technologies for advanced urban sewage treatment include: Coagulation sedimentation, filtration, biological activated carbon, lime, ozone, microfiltration, ultrafiltration, reverse osmosis, etc. According to different water quality conditions, one or several combinations can be selected. The following factors need to be considered during the selection process.: 1) Purpose and target water quality of recycled water ； 2) Process applicability and stability ； 3) Technical economy ； 4) Environmental factors, including environmental pollution, human health and safety. It is best to determine the process flow through on-site testing and draw on successful operation experience. This part of the study mainly introduces various water reuse deep treatment unit technologies such as coagulation sedimentation, high-efficiency filtration, biological activated carbon, lime, ozone, microfiltration, ultrafiltration, reverse osmosis, etc., and conducts technical and economic comparison and stability analysis. Through extensive experiments, the following conclusions were drawn:: 1) Membrane filtration technology produces low water turbidity ； Closed operation, no interference to the surrounding environment ； Only a small amount of chemicals are added, basically no secondary pollution ； Stable operation, simple operation, easy maintenance, and small footprint. Therefore, compared with traditional physical and chemical treatment processes, it has obvious advantages. The removal of organic pollutants, nitrogen, and phosphorus by microfiltration and ultrafiltration membrane filtration technologies is greatly affected by the quality of the incoming water, and has extremely high removal rates for non-dissolved pollutants. 2) The effluent water quality of ultrafiltration membrane filtration technology can basically meet the standards of "Water Quality for Urban Sewage Recycling and Landscape Environment" (GB/T18921-2002) and "Urban Miscellaneous Water Quality for Recycling and Utilization of Urban Sewage" (GB/T18920-2002), and can be used as the preferred advanced treatment process for water replenishment in Olympic parks. 3) Reducing nitrogen and phosphorus related indicators should be solved in the secondary biochemical treatment process, which is the most effective and economical. Therefore, it is recommended that the secondary treatment of sewage treatment plants add nitrogen and phosphorus removal processes, so that the effluent from the reverse osmosis process can stably meet the "Surface Water Environmental Quality Standard Class II" or even more stringent standards. 4) The water produced by the reverse osmosis process has the best quality and can meet the second-class surface water quality standards. Most of the indicators meet the drinking water source standards. It can be used as the highest quality recycled water in the central area of the Olympic Park. However, the investment and operating costs of this process are high. 2.2 Reclaimed water safety evaluation research In view of the important political significance of the Olympic Park and the demonstration significance of reclaimed water reuse, this study intends to integrate three evaluation index systems of chemistry, biological toxicity and ecological risk to evaluate the water quality treatment effects that different treatment processes can achieve, and focus on the long-term health risks and ecological risks of reusing the Olympic Park to develop a water quality evaluation index system and monitoring technology methods suitable for the reuse of recycled water to supplement urban landscape water bodies in northern regions. The study takes the inlet and outlet water of the advanced treatment process as the object, and makes a comprehensive safety evaluation of the Olympic Park water replenishment technology from two aspects: ecological safety, human health safety, and the impact of recycled water utilization on ecological green spaces. Advanced monitoring technology was applied and developed in the research, and an evaluation index system and monitoring technical specifications were established that are economical and applicable and meet the requirements of the Olympic Park water replenishment plan.
Filtration, current technologies include BAF, rotating disk filtration, activated sand filtration and disinfection, UV, ozone, chlorine dioxide membrane treatment, reverse osmosis, electroosmosis, ultrafiltration:)
"Design Regulations for Wastewater Recycling Projects" (GB50335--2002) 3. Regeneration treatment process and structure design 1. For urban sewage regeneration treatment, the following basic processes should be used: Secondary treatment – disinfection ； Secondary treatment - filtration - disinfection ； Secondary treatment - coagulation - sedimentation (clarification, flotation) - filtration - disinfection ； Secondary treatment - micropore filtration - disinfection unit technology has: Activated carbon adsorption, ozone-activated carbon, deamination, ion exchange, ultrafiltration, nanofiltration, reverse osmosis, membrane bioreactor, aerated biological filter, ozone oxidation, natural purification system, etc.
Common methods for advanced treatment of urban sewage include the following. Activated carbon adsorption membrane separation method, which is divided into: microfiltration; ultrafiltration; reverse osmosis; nanofiltration advanced oxidation method, which is divided into: wet oxidation method; wet catalytic oxidation method; supercritical water oxidation method; photochemical catalytic oxidation method; electrochemical oxidation method; ultrasonic radiation degradation method; ozone method
Activated carbon adsorption, ozone-activated carbon, deamination, ion exchange, ultrafiltration, nanofiltration, reverse osmosis, membrane bioreactor, aerated biological filter, ozone oxidation, natural purification system, etc.
"Design Regulations for Wastewater Recycling Projects" (GB50335--2002) 3. Regeneration treatment process and structure design 1. For urban sewage regeneration treatment, the following basic processes should be used: Secondary treatment – disinfection ； Secondary treatment - filtration - disinfection ； Secondary treatment - coagulation - sedimentation (clarification, flotation) - filtration - disinfection ； Secondary treatment - micropore filtration - disinfection unit technology has: Activated carbon adsorption, ozone-activated carbon, deamination, ion exchange, ultrafiltration, nanofiltration, reverse osmosis, membrane bioreactor, aerated biological filter, ozone oxidation, natural purification system, etc.
The third-level treatment is also called advanced treatment. The third-level treatment adopts corresponding treatment methods according to the incoming water quality. The technical units include agglutination and sedimentation, activated carbon filtration, reverse osmosis, ion exchange and electrodialysis.
Urban sewage advanced treatment technology: Generally speaking, reuse is not considered in the treatment of urban sewage. Therefore, its processing is mainly based on * * Emission standards go. Unit technologies can include the following: 1. Filtration system. The water can be pretreated with sand, activated carbon, etc., and most of the solid impurities, SS, etc. can be filtered. 2. Pretreatment system. This part includes many methods, both physical and chemical. Moreover, membrane technology is now used more for sewage treatment, especially in Zhejiang and many manufacturers such as Tianjin. Membrane technology has appeared. 3. Biochemical treatment. The treatment of urban sewage must eventually reach this stage. Whether it is anaerobic, aerobic, sludge method, MBR and other methods, it is still biochemical treatment, using biological bacteria to treat water.
Includes the following units: 1 level intensive treatment: Choose physical and chemical strengthening treatment, AB method front-end process, hydrolysis aerobic process front-end process, high-load activated sludge method and other technologies ； 2 Secondary processing: Conventional activated sludge method, oxidation ditch method, SBR method and AB method, biological filter and other technologies ； 3 Level 2 enhanced treatment: Use A/O method, /A/O method, oxidation ditch method, hydrolysis aerobic method, biological filter method, physical and chemical method and other technologies ； 4Natural purification treatment: Land treatment technology and stabilization ponds, etc. ； 5 Sludge treatment: Use anaerobic, aerobic, composting and other treatments ； 6Sludge recycling: Choose advanced treatment such as coagulation, filtration, disinfection or natural purification
Secondary treatment – disinfection； Secondary treatment - filtration - disinfection ； Secondary treatment - coagulation - sedimentation (clarification, flotation) - filtration - disinfection ； Secondary treatment - micropore filtration - disinfection unit technology has: Activated carbon adsorption, ozone-activated carbon, deamination, ion exchange, ultrafiltration, nanofiltration, reverse osmosis, membrane bioreactor, aerated biological filter, ozone oxidation, natural purification system, etc.
I know relatively few unit technologies: Activated carbon adsorption, ozone-activated carbon, deamination, ion exchange, ultrafiltration, nanofiltration, reverse osmosis, membrane bioreactor, aerated biological filter, ozone oxidation,
Common methods for advanced treatment of urban sewage include the following. 1. Activated carbon adsorption method 2. Membrane separation method, which is divided into: 1 microfiltration; 2 ultrafiltration; 3 reverse osmosis; 4 nanofiltration 3. advanced oxidation method 1 wet oxidation method 2 wet catalytic oxidation method; 3 supercritical water oxidation method; 4 photochemical catalytic oxidation method; 5 electrochemical oxidation method; 6 ultrasonic radiation 7 degradation method; 8 ozone method
In-depth processing methods include: Flocculation sedimentation method, sand filtration method, activated carbon method, ozone oxidation method, membrane separation method, ion exchange method, electrolysis treatment, wet oxidation method, evaporation concentration method, biological denitrification, dephosphorization method, etc.
According to the "Design Regulations for Wastewater Recycling Engineering" (GB50335--2002), the basic unit technologies for advanced treatment of urban sewage are: Activated carbon adsorption, ozone-activated carbon, deamination, ion exchange, ultrafiltration, nanofiltration, reverse osmosis, membrane bioreactor, aerated biological filter, ozone oxidation, natural purification system, etc.
In-depth processing mainly includes: Activated carbon adsorption method, ozone-activated carbon, deamination, ion exchange, ultrafiltration, nanofiltration, reverse osmosis, membrane bioreactor, aerated biological filter, ozone oxidation, natural purification system, etc. "Design Regulations for Wastewater Recycling Engineering" (GB50335--2002)
"Design Regulations for Wastewater Recycling Engineering" (GB50335--2002) Regeneration treatment process and structure design For urban sewage regeneration treatment, the following basic processes should be used: Secondary treatment – disinfection ； Secondary treatment - filtration - disinfection ； Secondary treatment - coagulation - sedimentation (clarification, flotation) - filtration - disinfection ； Secondary treatment - micropore filtration - disinfection unit technology has: Activated carbon adsorption, ozone-activated carbon, deamination, ion exchange, ultrafiltration, nanofiltration, reverse osmosis, membrane bioreactor, aerated biological filter, ozone oxidation, natural purification system and other water pollution control: Wastewater physical and chemical treatment methods: Grit tank, sedimentation tank, air flotation, ion exchange, membrane separation technology, sewage coagulation treatment, chemical precipitation (hydroxide precipitation method and sulfide precipitation method), electrolysis method ； Wastewater biochemical treatment methods: Activated sludge method, biological contact oxidation method, natural sewage treatment technology, nitrogen and phosphorus removal technology, stabilization pond, sludge treatment method, sludge anaerobic digestion. Commonly used agents for chemical phosphorus removal from wastewater: Chemical phosphorus removal is through the reaction of coagulants with phosphates in sewage to generate insoluble phosphorus-containing compounds and flocs, so that the phosphorus in sewage can be separated to achieve the purpose of phosphorus removal. Commonly used coagulants for chemical phosphorus removal include: Lime (calcium salt), aluminum salt, iron salt, etc. (1) Lime phosphorus removal 5Ca2++4OH-+3HPO42-→Ca5(OH)(PO4)3↓+3H2O (2) Aluminum salt phosphorus removal generally uses aluminum sulfate as the coagulant Al2(SO4)3+2PO43-→2AlPO4↓+3SO4 2- (3) Iron salt reduces phosphorus. The reaction between iron ions and phosphate is very similar to the reaction between aluminum ions and phosphate. Commonly used iron salt coagulants in China include ferric chloride FeCl3, ferrous sulfate FeSO4, etc.
Activated carbon attachment, ozone-activated carbon, deamination of nitrogen, ion exchange, microfiltration, ultrafiltration, nanofiltration, reverse osmosis, membrane bioreactor, aerated biological filter, ozone oxidation, coagulation filtration treatment
1. For urban sewage regeneration treatment, the following basic processes should be used: Secondary treatment – disinfection ； Secondary treatment - filtration - disinfection ； Secondary treatment - coagulation - sedimentation (clarification, flotation) - filtration - disinfection ； Secondary treatment - micropore filtration - disinfection unit technology has: Activated carbon adsorption, ozone-activated carbon, deamination, ion exchange, ultrafiltration, nanofiltration, reverse osmosis, membrane bioreactor, aerated biological filter, ozone oxidation, natural purification system, etc.
What you know is as follows: The main treatment technologies used to remove objects are filtration in suspended state of organic matter, coagulation and precipitation in dissolved state, coagulation and precipitation, activated carbon adsorption, ozone oxidation, plant-based nutrient salts, nitrogen stripping, ion exchange deamination, biological denitrification, phosphorus metal salt coagulation and precipitation, lime coagulation and precipitation crystallization method, biological phosphorus removal, trace components, dissolved inorganic salts, reverse osmosis, electrodialysis, ion exchange, microbial ozone oxidation, disinfection (chlorine, sodium hypochlorite, ultraviolet light)
The unit technologies for advanced urban sewage treatment include: Coagulation sedimentation, filtration, biological activated carbon, lime, ozone, microfiltration, ultrafiltration, reverse osmosis, etc. According to different water quality conditions, one or several combinations can be selected. The following factors need to be considered during the selection process.: 1) Purpose and target water quality of recycled water ； 2) Process applicability and stability ； 3) Technical economy ； 4) Environmental factors, including environmental pollution, human health and safety. It is best to determine the process flow through on-site testing and draw on successful operation experience. This part of the study mainly introduces various water reuse deep treatment unit technologies such as coagulation sedimentation, high-efficiency filtration, biological activated carbon, lime, ozone, microfiltration, ultrafiltration, reverse osmosis, etc., and conducts technical and economic comparison and stability analysis. Through extensive experiments, the following conclusions were drawn:: 1) Membrane filtration technology produces low water turbidity ； Closed operation, no interference to the surrounding environment ； Only a small amount of chemicals are added, basically no secondary pollution ； Stable operation, simple operation, easy maintenance, and small footprint. Therefore, compared with traditional physical and chemical treatment processes, it has obvious advantages. The removal of organic pollutants, nitrogen, and phosphorus by microfiltration and ultrafiltration membrane filtration technologies is greatly affected by the quality of the incoming water, and has extremely high removal rates for non-dissolved pollutants. 2) The effluent water quality of ultrafiltration membrane filtration technology can basically meet the standards of "Water Quality for Urban Sewage Recycling and Landscape Environment" (GB/T18921-2002) and "Urban Miscellaneous Water Quality for Recycling and Utilization of Urban Sewage" (GB/T18920-2002), and can be used as the preferred advanced treatment process for water replenishment in Olympic parks. 3) Reducing nitrogen and phosphorus related indicators should be solved in the secondary biochemical treatment process, which is the most effective and economical. Therefore, it is recommended that the secondary treatment of sewage treatment plants add nitrogen and phosphorus removal processes, so that the effluent from the reverse osmosis process can stably meet the "Surface Water Environmental Quality Standard Class II" or even more stringent standards. 4) The water produced by the reverse osmosis process has the best quality and can meet the second-class surface water quality standards. Most of the indicators meet the drinking water source standards. It can be used as the highest quality recycled water in the central area of the Olympic Park. However, the investment and operating costs of this process are high. Research on safety evaluation of recycled water In view of the important political significance of the Olympic Park and the demonstration significance of recycled water reuse, this study intends to integrate three evaluation index systems of chemistry, biological toxicity and ecological risk to evaluate the water quality treatment effects that different treatment processes can achieve, and focus on the long-term health risks and ecological risks of reusing the Olympic Park to develop a water quality evaluation index system and monitoring technology methods suitable for the reuse of recycled water to supplement urban landscape water bodies in northern regions. The study takes the inlet and outlet water of the advanced treatment process as the object, and makes a comprehensive safety evaluation of the Olympic Park water replenishment technology from two aspects: ecological safety, human health safety, and the impact of recycled water utilization on ecological green spaces. Advanced monitoring technology was applied and developed in the research, and an evaluation index system and monitoring technical specifications were established that are economical and applicable and meet the requirements of the Olympic Park water replenishment plan.