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Team:Bielefeld-Germany/Sewage treatment plant
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The first step in the sewage treatment ist the retaining of rude solids with rakes. Grates directly behind the rakes hinder swimming solids. The intake pumping station transports the water to the grit chamber and the primary clarifier at a slightly higher level. The grit chamber is also used to remove fat. The trapeziform cross section and aeration with air support the sedimation of sand, although the organic solid remain in the water. The sediment is removed with special movable plates and after washing and drying the sand can be used in road building. The Primary clarifier is the last step in the mechanical cleaning and works with sedimation, too. In modern sewage treatmant plants primary clarifier are rarely used because they lower the concentration of easy biodegradable sustances, which are necessary for denitrification. The mechanical stage is also called primary treatment. | The first step in the sewage treatment ist the retaining of rude solids with rakes. Grates directly behind the rakes hinder swimming solids. The intake pumping station transports the water to the grit chamber and the primary clarifier at a slightly higher level. The grit chamber is also used to remove fat. The trapeziform cross section and aeration with air support the sedimation of sand, although the organic solid remain in the water. The sediment is removed with special movable plates and after washing and drying the sand can be used in road building. The Primary clarifier is the last step in the mechanical cleaning and works with sedimation, too. In modern sewage treatmant plants primary clarifier are rarely used because they lower the concentration of easy biodegradable sustances, which are necessary for denitrification. The mechanical stage is also called primary treatment. | ||
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=== Secondary treatment: first biological stage === | === Secondary treatment: first biological stage === | ||
Revision as of 11:52, 26 September 2012
Contents |
Introduction
Sewage is generated every day by everyone. Therefore efficient sewage treatment is absolutely necessary to guarantee the quality of surface water, ground water and of course of drinking water. However sewage is often heterogeneous and consists of liquids from toilets, kitchen, sinks as well as liquids from industrial processes and commercial use. Sewage treatment plants have to consist of various treatment stages. The general composition of a large-scale treatment plant is shown in the flow diagram in picture 1.
Functional principle
Schematic
The large-scale sewage treatment plant “Obere Lutter” is located near Gütersloh and is equipped with three sewage stages. The different stages will be explained in the following section.
Primary treatment: mechanical stage
The first step in the sewage treatment ist the retaining of rude solids with rakes. Grates directly behind the rakes hinder swimming solids. The intake pumping station transports the water to the grit chamber and the primary clarifier at a slightly higher level. The grit chamber is also used to remove fat. The trapeziform cross section and aeration with air support the sedimation of sand, although the organic solid remain in the water. The sediment is removed with special movable plates and after washing and drying the sand can be used in road building. The Primary clarifier is the last step in the mechanical cleaning and works with sedimation, too. In modern sewage treatmant plants primary clarifier are rarely used because they lower the concentration of easy biodegradable sustances, which are necessary for denitrification. The mechanical stage is also called primary treatment.
Secondary treatment: first biological stage
Secondary treatment: second biological stage
Tertiary treament: fourth purification stage
The new innovation: Immobilized Laccases
Expert evaluation
Sewage treatment plant: Schloß Holte-Stukenbrock
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