Wastewater Treatment

Topic 10 - Using Resources
Written By Atheridge Tuition

What are the steps involved in wastewater treatment?

[5 marks]

Visual Mark Scheme Breakdown

    • Screening using a metal grid

    (1 mark)

Vector graphic showing metal grid with plastic bottles trapped on one side and water flowing through to the other. Text reads: Screening using metal grid.

    • Grit removal

    (1 mark)

Vector graphic showing a tank with water flowing inside and grit (small grey circles) sinking to the bottom. Text reads: Grit Removal.

    • Sedimentation (1 mark)

Vector graphic showing a sedimentation tank outline with water flowing into and out of it and brown sludge sunk at the bottom. Text reads: sedimentation.

    • The effluent (lighter liquid on top) undergoes aerobic biological treatment.

    • The sewage sludge (sunk at the bottom) undergoes anaerobic digestion.

    (2 mark)

Vector graphic showing sedimentation tank with water flowing through and sludge sunk at the bottom. The water is labelled 'Effluent' and text reads 'aerobic treatment'. 'Sewage sludge' is also labelled and text reads: 'anaerobic digestion'.
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