B4 - Water 2025

Question 1

Name the different types of water

Answer 1

Drinking water // dricksvatten
Wastewater // avloppsvatten
Stormwater // dagvatten

Question 2

How many publicly owned waterworks (WTP) exist in Sweden?

Answer 2

Ca 2000

Question 3

How many wastewater treatment plants (WWTP) exist in Sweden?

Answer 3

Ca 2000

Question 4

How long is the Swedish pipe network?
How much does it cost to build new?

Answer 4

101 000km
100miljarder SEK

Question 5

Running the publicly owned waterworks/wastewater facilities in Sweden costs

1,6 billion SEK
16 billion SEK
160 billion SEK

Answer 5

16 billion SEK

Question 6

Ange procentandelarna av totalkostnaden för att driva vattenverken i Sverige

(produktion & distribution av dricksvatten vs uppsamling och behandling av skitvatten/sewage)

Answer 6

42% production and distribution
58% collection and treatment of sewage

Question 7

Hur många km3 wastewater behandlas per år i Sverige?

Answer 7

1.2km3

Question 8

What was the total water use in Sweden as of 2020?

Answer 8

2.5 billion m3 freshwater
0.5 billion m3 seawater

Question 9

Fix the pairs (stats from 2020) regarding total water use in Sweden

Agriculture
Households
Industry
Other use

4%
12%
23%
61%

Answer 9

Agriculture - 4%
Households - 23%
Industry - 61%
Other use - 12%

Question 10

What is the water consumption liter/person/day in Sweden?

Answer 10

140 liter/person/day

Question 11

According to WHO, the minimum requirement of water per person per day is ____ and the requirement for basic hygiene is _____

Answer 11

7.5 liter/person/day minimum
20 liter/person/day basic

Question 12

Fix the pairs
Other uses
Food/drinks
Personal hygiene
Toilet flushing
Laundry
Washing dishes

10
10
15
15
30
60

Answer 12

60 personal hygiene
30 toilet flushing

15 washing dishes
15 laundry

10 food/drinks
10 other uses

Question 13

What happened in Gothenburg in
1787
1800:s
1866

Answer 13

Innan 1787 - folk drack förorenat vatten från kanalen

1787 - the municipality becomes responsible for water supply

1800:s koleraepidemi (London öl)

1866: implementing sewer system, first Swedish town to do so

Question 14

Whats the raw water source of Gothenburg and what’s the intake in l/s?

Answer 14

Larjeholm

2000 l/s

Question 15

What’s the main drinking water concern according to WHO?

Answer 15

Pathogens
- bacteria
- viruses
- protozoa
- helminths

Metals and organic contaminants

Emerging contaminants
- microplastics
- pharmaceuticals

Question 16

What are the two drinking water treatment plants in Gothenburg?

Answer 16

Alelyckan
- UV irradiation

Lackarebäck
- ultrafiltration

Both:
- pH adjustment
- chlorination
- active carbon filter
- sedimentation and separation

Question 17

DRINKING WATER TREATMENT
In Gothenburg, there are
____ km pipe network
____ pumps
____ water towers

And due to old infrastructure there is
____% leakage

Answer 17

1760km
68 pumps
13 water towers
23%

Question 18

What are the 3 key issues with wastewater?

Is there a wastewater directive that we need to follow?

Answer 18

1. Health issues (pathogens)
2. Environmental issues (toxic substances, eutrophication, oxygen depletion)
3. Esthetics (odours)
   (Aka Seine i Paris)

JA, EU Water framework directive

Question 19

SEWAGE INFRASTRUCTURE IN GBG
Gothenburg has
___ km sewage pipes
___ km household sewage pipes
___ km stormwater pipes
___ km combines pipes
The pipes belong to the municipal department of ____

Answer 19

2476 km
1106km
871km
499km

Sustainable Water and Waste//Kretslopp och vatten

Question 20

Mention some fun facts about Ryaverket! 😃😃😃😃😃

Answer 20

GBG:s enda wastewater plant

Serves 780 000 från Göteborg och kranskommunerna (Ale represent)

Intake 4000 l/s

Tar hand om 55000ton rötslam/sludge per år

Mechanical, chemical and biological treatment

Question 22

What is a REVAQ certification?

Answer 22

Ett certifieringssystem för att skyffla tillbaka avloppsslam till åkermark (Ryaverket)

Question 23

Explain the urban water system by using the term ”socio-technical system”

Bra exempel slide 24/30 i pp

Answer 23

Technical system
- treatment plants
- pipes
- sewage system
- wastewater treatment 🪴

Social system (people)
- direct consumption
- wastewater production
- land use

Question 24

Explain black water and grey water

Answer 24

Black water - avloppsvatten/sewage water flushed in the toilets

Grey water - polluted water that has NOT been in contact with faecal matter (=toa)

Question 25

Mitigation

Answer 25

”Lindrande” Utsläppsreducering och stabilisering av greenhouse gases i atmosfären

Question 26

Define stormwater/dagvatten

Answer 26

Water originating from - precipitation (nederbörd) - melted snow/ice

Question 27

Define cloudburst/skyfall

Answer 27

50mm in 1h ELLER 1mm in 1minute (SMHI)

Question 28

Define 100-year rain

Answer 28

Rain event that has the probability of happening once in 100 years (duration/volume/location)

Question 29

Antalet skyfall förutspås öka med ___ till ___% i Sverige

Answer 29

10-40%

Question 30

What are the 5 challenges of Gothenburg regarding cloudburst and stormwater?

Answer 30

1. Topography 2. Göta Älv and the coastal area - rising sea levels 3. Clay in low points - limited infiltration 4. Growth - impervious areas (kan ej bygga överallt) 5. Underdimensioned pipe system

Question 31

____ million liter/year sewage water is discharged into GBG:s rivers without any treatment. This is known as CSO, ____

Answer 31

180 million liter/year Combined sewer overflow

Question 32

Kolla slide 18/55 för mer info och bilder om stormwater runoff/impervious areas

Answer 32

-

Question 33

Name some stormwater solutions

Answer 33

Nature-based solutions - stormwater ponds - raingardens - Dikes or swales - Green roofs - Green facades Not nature-based - permeable asphalt (speciell asfalt som låter dagvatten sjunka undan) - reservoirs

Question 34

SOLUTION DESIGN Give examples/explain 1. Social values 2. Ecological values 3. Climate benefits 4. Economical value

Answer 34

1. Recreation, physical activites, meeting spots 2. Biodiversity and stormwater quality 3. Resilience of solutions, local climate impacts 4. Costs for implementation and maintenance

Question 35

How often is the Climate Change Adaptation Strategy changed (nationally level)

Answer 35

Every 5th year

Question 36

Are municipal guidelines legally-binding?

Answer 36

Nope ”Limited and unclear implementation”

Question 37

What is an effective way to avoid flooding?

Answer 37

Placing the solution upstreams to prohibit flooding downstreams

Question 38

Hur kan man bygga vägar med tanke på skyfallshantering (4sätt, se slide 39/55 i pp)

Answer 38

1. Cloudburst road 2. Retention street 3. Central retention 4. Cloudburst pipe