Effluent

Question 1

Effluent

Answer 1

Waste water

Question 2

Measurement parameters of effluent

Answer 2

• volume
• suspended solidly (TSS)
• chemical oxygen demand (COD)
• biochemical oxygen demand (BOD)
• pH
• temperature

Question 3

Effluent loading

Answer 3

BOD- biochemical oxygen demand
COD- chemical oxygen demand
TSS - suspended solids

Question 4

COD - chemical oxygen demand

Answer 4

The amount of oxygen required to break down/ oxidise the biological matter in effluent

Question 5

BOD - biochemical oxygen demand

Answer 5

The amount of oxygen required by microbes to digest the nutrients in effluent.

Question 6

Primary effluent treatment

Answer 6

Deals with pH and suspended solids

Question 7

Secondary effluent treatment

Answer 7

Deals with BOD/COD and uses aerobic it anaerobic treatments

Question 8

Tertiary effluent treatment

Answer 8

Further sanitisation. With first and second treatments, removes 100% of effluent loading

Question 9

Balance tank (primary treatment)

Answer 9

A tank in which settleable solids are removed by gravity. Settling tanks or lamella plates with flocculants or coagulants are added to make solids easier to remove. PH is adjusted with additives.
- dissolved air filtration: tiny air bubbles stick to the coagulated solids and float to the surface, where they are skimmed off.

Question 10

Anaerobic treatment

Answer 10

Anaerobic bacteria break down organic compounds in a USAB reactor (upward flow sludge blanket).
- Blanket of anaerobic microbes suspended in a tank. Effluent flows upwards through blanket and is digested and converted to methane.