Wastewater Treatment Revision crossword

Specifically for University of Birmingham students revising for the Water Treatment exam 2022.

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• Created by: DanDay
• Created on: 16-01-22 22:07
An old system where stormwater runoff is not separated from raw sewage. So when the wastewater treatment plant is overflowing, some runoff water and raw sewage is discharged into nearby rivers or sea.
Nowadays towns are built with a separate system.
Combined Sewer Overflows
1 of 14
The unwanted process of groundwater seeping into sewers, thus diluting the sewage and increasing the volume going to treatment plant.
Infiltration
2 of 14
When calculating flows and loads, PE stands for...
Population Equivalent
3 of 14
The first process in preliminary treatment of wastewater. It involves removing solid debris and grit.
Screening
4 of 14
The main process in primary treatment of wastewater. The purpose is to remove fine solids.
Settlement
5 of 14
Formula for calculating the velocity of settlement. Importantly, it relies on 3 assumptions: discrete particles, spherical shape particles, and laminar flow.
Stokes Law
6 of 14
SOR is the main parameter in designing primary settlement tanks. What does SOR stand for? Clue: lecture slides '6 Primary Treatment'.
Surface Overflow Rate
7 of 14
For circular settlement tanks, the influent needs to be introduced without resuspending the settling sewage. So a component is added to the tank which reduces the turbulence of the influent. What is that component called? Hint: It is 1-4% of the area.
Stilling Chamber
8 of 14
Problematic process that occurs if the tanks are too large, too deep, and Hydraulic Retention Time (HRT) is too great. This issue brings odour problems and rising sludge.
Anaerobic
9 of 14
Biological Oxygen Demand (BOD) test typically needs 5 days to give a result. It measures biodegradable pollutants in the wastewater. The purpose of the biological treatment process in the treatment plant is to ________ the BOD of the waste water.
decrease
10 of 14
Chemical Oxygen Demand (COD) test produces toxic waste products so is less sustainable than BOD test. The advantage of COD is that it measures pollutants that are ___-_____________.
11 of 14
Bacteria divide by a process called _______ _______. (6,7)
Binary Fission
12 of 14
The growth rate of a Micro-Organism can be measured by this empirical equation. (5,8)
Monod Equation
13 of 14
Trickling filters are a system for pouring wastewater onto stone media, with bacteria living on the stones (in a thin biofilm), to biodegrade the organic pollutants. When the biofilm detaches it is called...
Sloughing
14 of 14

Other cards in this set

Card 2

Front

The unwanted process of groundwater seeping into sewers, thus diluting the sewage and increasing the volume going to treatment plant.

Infiltration

Card 3

Front

When calculating flows and loads, PE stands for...

Card 4

Front

The first process in preliminary treatment of wastewater. It involves removing solid debris and grit.

Card 5

Front

The main process in primary treatment of wastewater. The purpose is to remove fine solids.