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Atv Dvwk A 131 E.pdf
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Chanelleinger Ansl
Dec 10, 2023, 12:19:53 AM12/10/23
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What is ATV-DVWK-A 131E and why is it important for wastewater treatment?
ATV-DVWK-A 131E is a standard for the dimensioning of single-stage activated sludge plants, which are widely used for wastewater treatment. The standard was developed by the German Association for Water, Wastewater and Waste (ATV-DVWK) and provides guidelines for the design, operation and performance evaluation of these plants.
Atv Dvwk A 131 E.pdf
Download https://ckonti.com/2wJvZc
Activated sludge is a biological process that uses microorganisms to remove organic matter, nitrogen and phosphorus from wastewater. The microorganisms form flocs that settle in a secondary clarifier, where they are separated from the treated water. Some of the sludge is recycled back to the aeration tank, where it mixes with the incoming wastewater and oxygen. The excess sludge is wasted and disposed of or reused.
The ATV-DVWK-A 131E standard specifies the parameters and methods for calculating the required volume of the aeration tank and the secondary clarifier, as well as the sludge production and oxygen demand. The standard also defines the quality criteria for the effluent and the sludge, as well as the monitoring and control requirements. The standard aims to ensure that the activated sludge plants are designed and operated in an efficient, reliable and sustainable way.
There are different types of single-stage activated sludge plants, depending on the configuration of the aeration tank, the aeration method and the process control. Some examples are:
Package plants: These are compact and modular plants that can be easily transported and installed. They are suitable for small communities or industries that need a simple and reliable wastewater treatment system. Package plants usually consist of a prefabricated aeration tank and a secondary clarifier, with diffused aeration or surface aerators.
Oxidation ditch: This is a circular or oval-shaped aeration tank with horizontal rotors that provide oxygen and mixing. The oxidation ditch has a long hydraulic retention time and a high sludge age, which results in a high removal of organic matter and nitrogen. The treated water flows to a secondary clarifier for sludge separation.
Deep shaft/vertical treatment: This is a process that uses a vertical shaft as the aeration tank, where compressed air is injected at the bottom. The air bubbles create an upward flow of the mixed liquor, which exits at the top of the shaft and flows to a secondary clarifier. The deep shaft process can achieve high oxygen transfer efficiency and high loading rates.
Surface-aerated basins: These are rectangular or circular basins with mechanical aerators that float on the surface of the mixed liquor. The aerators provide oxygen and mixing by splashing the water into the air. Surface-aerated basins are simple and low-cost, but they have low oxygen transfer efficiency and high energy consumption.
Sequencing batch reactors (SBRs): These are batch-operated systems that use one or more tanks to perform all the steps of the activated sludge process in sequence. The steps include filling, aeration, settling and decanting. SBRs can handle variable influent flows and loads, and can achieve simultaneous nitrification-denitrification and phosphorus removal by alternating aerobic and anoxic conditions.
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ATV-DVWK-A 131E is a standard for the dimensioning of single-stage activated sludge plants, which are widely used for wastewater treatment. The standard was developed by the German Association for Water, Wastewater and Waste (ATV-DVWK) and provides guidelines for the design, operation and performance evaluation of these plants.
Atv Dvwk A 131 E.pdf
Download https://ckonti.com/2wJvZc
Activated sludge is a biological process that uses microorganisms to remove organic matter, nitrogen and phosphorus from wastewater. The microorganisms form flocs that settle in a secondary clarifier, where they are separated from the treated water. Some of the sludge is recycled back to the aeration tank, where it mixes with the incoming wastewater and oxygen. The excess sludge is wasted and disposed of or reused.
The ATV-DVWK-A 131E standard specifies the parameters and methods for calculating the required volume of the aeration tank and the secondary clarifier, as well as the sludge production and oxygen demand. The standard also defines the quality criteria for the effluent and the sludge, as well as the monitoring and control requirements. The standard aims to ensure that the activated sludge plants are designed and operated in an efficient, reliable and sustainable way.
There are different types of single-stage activated sludge plants, depending on the configuration of the aeration tank, the aeration method and the process control. Some examples are:
Package plants: These are compact and modular plants that can be easily transported and installed. They are suitable for small communities or industries that need a simple and reliable wastewater treatment system. Package plants usually consist of a prefabricated aeration tank and a secondary clarifier, with diffused aeration or surface aerators.
Oxidation ditch: This is a circular or oval-shaped aeration tank with horizontal rotors that provide oxygen and mixing. The oxidation ditch has a long hydraulic retention time and a high sludge age, which results in a high removal of organic matter and nitrogen. The treated water flows to a secondary clarifier for sludge separation.
Deep shaft/vertical treatment: This is a process that uses a vertical shaft as the aeration tank, where compressed air is injected at the bottom. The air bubbles create an upward flow of the mixed liquor, which exits at the top of the shaft and flows to a secondary clarifier. The deep shaft process can achieve high oxygen transfer efficiency and high loading rates.
Surface-aerated basins: These are rectangular or circular basins with mechanical aerators that float on the surface of the mixed liquor. The aerators provide oxygen and mixing by splashing the water into the air. Surface-aerated basins are simple and low-cost, but they have low oxygen transfer efficiency and high energy consumption.
Sequencing batch reactors (SBRs): These are batch-operated systems that use one or more tanks to perform all the steps of the activated sludge process in sequence. The steps include filling, aeration, settling and decanting. SBRs can handle variable influent flows and loads, and can achieve simultaneous nitrification-denitrification and phosphorus removal by alternating aerobic and anoxic conditions.
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