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Key Data Set Information
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Location
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HLJ-CN
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Geographical representativeness description
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Ashihe River Watershed
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Name
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Municipal wastewater treatment ; Wastewater ; cyclic activated sludge technique
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Use advice for data set
| When using the data set related to the cyclic activated sludge technique, users must consider the specific characteristics of wastewater within the Ashihe River Watershed. Local geographical, climatic, and industrial conditions may affect the generalizability of the data. It is important to update data sets regularly to reflect technological improvements and environmental regulations changes. Furthermore, users should also model the potential impacts of the sludge disposal or recycling practices when applying this data. |
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Technical purpose of product or process
| The cyclic activated sludge technique is used in wastewater treatment within the Ashihe River Watershed. It is a method employed to remove organic pollutants and nutrients from sewage or industrial wastewater by facilitating the degradation process with microbial biofilms. This technique is applicable in municipal or industrial water treatment facilities aimed at maintaining the ecological balance of the Ashihe River ecosystem. |
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Classification
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Class name
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Hierarchy level
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| In municipal wastewater treatment, the activated sludge process is a commonly used technology. This process involves mixing wastewater containing pollutants with activated sludge and circulating them to degrade and transform organic matter and ammonia nitrogen pollutants into harmless substances through microbial action. In this process, wastewater is introduced into a reactor where it is mixed with activated sludge and exposed to oxygen supply, stimulating the growth and metabolism of microorganisms. Microorganisms utilize organic matter as a carbon and energy source for growth while oxidizing pollutants. The treated water, after processes such as sedimentation and filtration, meets discharge standards, while the recycled activated sludge can be reused in subsequent treatment cycles. |
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Copyright
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No
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Owner of data set
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Quantitative reference
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Reference flow(s)
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Technological representativeness
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Technology description including background system
| In municipal wastewater treatment, the Modified Ludzak-Ettinger (MLE) process exhibits the following technical characteristics:Bioreactor Design: The MLE process typically employs multi-stage bioreactors to provide sufficient contact time and oxygen supply, promoting microbial growth and organic matter degradation.Recirculation System: Recirculation systems are utilized in this process to return a portion of treated sludge back to the reactor, increasing microbial concentration and activity, thus enhancing wastewater treatment efficiency.Oxygen Control: Oxygen is a critical factor for microbial growth and organic matter oxidation. Control of oxygen supply and aeration methods need to be adjusted based on influent water quality and treatment requirements to maintain appropriate oxygen concentration and gas-liquid ratio.Mixing and Agitation: Effective mixing systems are essential to maintain uniform mixing in the reactor, ensuring even distribution of wastewater and sludge to improve contact efficiency between wastewater and microorganisms.Operating Conditions: Operating the MLE process requires control of parameters such as temperature, pH, and oxidation-reduction potential within the reactor to maintain microbial growth and activity. Additionally, regular monitoring and adjustment of the system are necessary to cope with fluctuations in influent water quality and operational changes.Related Upstream and Downstream Processes: Upstream processes include pretreatment of wastewater, such as screening, grit removal, and sedimentation, to remove large particles and settleable solids. Downstream processes may involve secondary clarifier sedimentation, filtration, etc., to separate and remove biomass flocs and suspended solids, ultimately producing treated water that meets discharge standards. |