Effluent

Question 1

Effluent

Answer 1

Waste water

Question 2

Measurement parameters of effluent

Answer 2

-Volume
-Suspended solids (TSS)
-Chemical oxygen demand (COD)
-Biological oxygen demand (BOD)
-pH
-Temperature

Question 3

Effluent loading

Answer 3

BOD, COD, TSS

Question 4

COD, Chemical oxygen demand

Answer 4

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

Question 5

BOD, Biological 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 or anaerobic treatments

Question 8

Tertiary effluent treatment

Answer 8

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

Question 9

Balance Tanks (primary treatment)

Answer 9

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

Question 10

Anaerobic treatment (secondary)

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 upward through blanket and is digested and converted to methane.