Introduction to Environmental Engineering Lab TechniquesEnvironmental Engineering II

Wastewater

•Wastewater is sewage, stormwater, and water that has been used for various purposes around the community.

Sources of Wastewater

•It is essential to characterise ww as each source o has different composition. This results in different impacts on the environment.

Goals of testing.• To design the appropriate wastewater

treatment plant (WWTP) for specific area.

To monitor and evaluate efficiency of treatment processes in WWTP.

Outflow and inflow turbidity is measured.

Recharge of groundwater

Reuse of treated wastewater.

To make the Environmental Impact Assessment

Testing procedures

•Sample collection techniques • Field measurements •Sample labeling (including location(s))

and documentation •Sample preservation and holding time •Transfer of custody and shipment of

samples •Quality control •Data handling and reporting.

Sampling procedures

Field Measurements

•Temperature•pH•Dissolved oxygen•Electrical conductivity•Turbidity.

Preservation

•The sample is preserved at 4 degree celsius and to inhibit bacterial action preservatives must be added.

Tests to be performed.

•pH•Turbidity•Alkalinity•Hardness•Sulphates and chlorides•COD•BOD

Contd.

•DO•Coliform