Wastewater Engineering

General Aspects of Wastewater Engineering

The term “wastewater engineering” covers all the technologies in the use of waste water, collection, discharge and waste water treatment. The two largest areas of waste water engineering concern with the water quality and the drainage technology.

Treatment plant construction and its purification stages

In a sewage treatment plant, there are various purification steps, which can be in turn to be subdivided into smaller stations. The various stages are generic. Each treatment plant, however, has a special structure.

Purification steps

  • Rain relief:
    • If rain and waste water fed into one channel of the wastewater treatment plant (mixed system), then the sewer system usually be relieved by a rain-relief system, through a storm water and / or by an overflow basins.

  • Rake:
    • Wastewater is passed through a screen or sieve drum
    • Coarse dirt stuck
    • Distinguishes are in fine and coarse screens

  • Sand / grease trap:
    • The sand and grease trap is a sedimentation tank, with the task of removing coarse settleable contaminants from wastewater

  • Primary clarifier:
    • Suspended solids (faeces, paper, etc.) settles
    • Approximately 30 percent of the organic matter can be removed

  • Aeration tanks:
    • Is in the so-called activated sludge tank by venting the activated sludge (mass of flaky aggregate bacteria) offset the reduced effluent wastewater constituents of the fresh sewage bionically oxidatively

  • Clarifier:
    • process forms a unit with the aeration tank
    • separated by settling of the activated sludge from wastewater

Focus of the wastewater technology of the TU_Darmstadt iGEM team

Based on the iGEM project we have decided to focus on cleaning techniques in wastewater treatment plants.

Among the techniques of wastewater treatment in recent years, in addition to mechanical (rake, sand trap and sedimentation) and biological processes (activated sludge) also chemical processes (precipitation and phosphate) and the use of membrane filters replaced.

According to our project, we asked ourselves how we can use the micro-organism in a water treatment plant in the future PET.er.

Since the microorganism works only aerobic would be the best possible use to the aeration tank. For the future, an additional test basin at the example of the treatment plant in Gross-Gerau would be to test the dose, in which you can add the tribes, in which tolerability they stand with other organisms, how they could be dangerous to humans and whether any improvement in water quality occurs.