Team:Bielefeld-Germany/Sewage treatment plant

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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

Picture 1: Flow diagram of a large-scale sewage treatment plant, including three stages: primary stage to remove heavy and big solids, secondary stage to remove dissolved and suspended organic material using micro-organisms and tertiary stage to remove particulate material and to disinfect, taken and translated from wikipedia.

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.

Picture 2:Plan view of the sewage treatment plant Obere Lutter, located in Gütersloh. Picture is generously provided by the water and sewage board Obere Lutter.

Primary treatment: mechanical stage

[File:Bielefeld2012_Stage1.jpg|250px|thumb|left| Mechanical stage of the sewage treatment plant Obere Lutter with 1: Rake, 2: Intake pumping station, 3: Grit chamber, 4: Primary clarifier]

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