waste water

[beiiishey]

You can hide this advertisement by registering.

help please on how to outline the waste water treatment process..thanks

[(enigma)]

http://hsc.csu.edu.au/earth_environm..._5/945net.html

should give you a start. im guessing its the sewagw treatment stuff? i had a flow chart that i did somewhere but no idea where it is now.

[Eisadia]

sewage i believe is generally referred to in sections of primary, secondary and tertiary

Primary refers to the removal and/or sedimentation of solids
seives catch solid material such as plastics. chemicals may be added to assist sedimentation

Secondary refers to the chemical breakdown. This is where bacteria (both aerobic - with oxygen and anaerobic - without oxygen) "eat" or breakdown the biological material. basically they "digest" the nitrates and phosphates.
These nitrates and phosphates are converted by the bacteria into other materials which is termed "activated sludge".
This activated sludge is removed/sedimented out as a part of the secondary phase of treatment.
This process can be done in tanks (where the foecal-water is aerated for periods, then not aerated) or by pouring the water over the surface of jagged rocks where the bacteria digest it. Both methods are viable, and both require sedimentation of activated sludge.

Tertiary treatment is not always undertaken in all circumstances. It refers to the sterilisation and/or release of water.
This can be accomplished by the use of
UV Light - breaks down cell structure
OR
Chlorine - used in bleach and an excellent 'bug' killer
OR
Ozone gas - basically it is poisonous at ground level

Some water is simply released into the oceans untreated.


The detail is not really required; they just want you to know a flow chart i believe. that means a small piccie and arrows between



Primary - remove solids
----->
Secondary - bacteria break down material
- activated sludge removed
----->
Tertiary - Sterilisation (UV, Cl or Ozone)
Release



pee.dot.ess

i am not perfect and definitely not always right
i hope it has helped