Classification Of Wastewater Treatment Methods

Unit Process

 

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 Physical Unit Process:

1. Screening,
2. Mixing,
3. Flocculation,
4. Sedimentation,
5. Flotation,
6. Filtration
7. Adsorption.

Chemical Unit Process: (removal of the constituent) Precipitation, gas transfer, adsorption, disinfection

1. 1. Chemical addition
2. 2. Chemical reactions

Note: Chemical precipitate can remove with settling, filtration or membrane process. 

(1. Additon of oxygen is a chemical unit process 2. Chlorine disinfection) 

Biological Unit Processes: Removal of the constituent by biological activity (also remove N & P)

1. Removal of colloidal
2. Dissolved biodegradable organic substances

Substances converts into:

1. Gases to the atmosphere
2. Biological cell tissue (doku) removed by settling or another solid’s separation process.

Note: The engineer responsible for proper environment and control the efficiency

Difference between precipitation and sedimentation in Environmental Engineering?

    Sedimentation: is settling down the solid particle, 

    Precipitation: is a phase change with gas to liquid

    Adsorption: (to take onto the surface of a solid)

    Absorption:  (to take in)

Difference between Unit Operation and Unit Process in Environmental Engineering?

Unit Operation: Physical Processes (Sedimentation, Filtration etc.

Unit Process: Chemical (disinfection, precipitation, ion exchange etc.) & Biological (Activated Sludge etc.)