Physical
Related to the quality of water for domestic use.
Associated with the appearance of water
Eg. Color, turbidity, temperature, taste and odor.
Chemical
Sometimes evidenced by their observed reactions (comparative performance of
hard & soft waters in laundering)
Most often, differences are not visible.
Microbiology
Very important in their relation to public health
Significant in modifying the physical and chemical characteristic of water
Radiological
Considered in areas where there is a possibility that the water may have come in
contact with radioactive substances
Total Suspended Solid (TSS)
Mass remain on whatman filter GF/C after drying at 103-105oC
Measures biodegradable organics
Uses oxidizing microorganism
Affected by toxic substance
Affected by temperature
5 days incubation
Accuracy + 10%
Measures biodegradable and non biodegradable organics
Uses a strong chemical agent
Not affected
Not affected
2 hrs
Accuracy + 2%
Toxicity is the degree to which a substance is able to damage an exposed organism.
10. What is the Eutrophication process? What role does it have in the ecosystem?
What is Oligotrophic?
Limitations of BOD Test
A high concentration of active, acclimated seed bacteria is required.
Pretreatment is needed when dealing with toxic wastes, and the effects of nitrifying organisms must be reduced.
Only the biodegradable organics are measured.
The test does not have stoichiometric validity after the soluble organic matter present in solution has been used.
An arbitrary, long period of time is required to obtain results.