Existing Activated Sludge Process has limitation of BOD, COD reduction in STP outlet to meet existing NGT limits of BOD <10 and COD<50 mg/l. Retrofit of AFM based tertiary treatment with existing system enables to meet the NGT norms Tertiary Treated STP effluent can be used as make up CW System. Activated Filter Media (AFM) Technology is selected for NTPC Talcher K and Dadri.
Technology:
Activated Filter Media (AFM) is manufactured by up-cycling post- consumer green glass bottles to produce water filtration media. It is an activated amorphous alumina-silicate with +ve charge organic adsorption (OAD) number greater than 10, the activated hydrophilic surface has cation bridging, hydrogen bonding and entropic interactions with organic molecules
Advantages of AFM:
AFM can be recovered and up cycled for reuse again and again for water filtration, or can be directed into high value uses:
- High Removal efficiency from Secondary STP water BOD (<5 ppm) & COD (<50 ppm)
- Backwash water requirement reduces by up to 50%.
- Increased run phase and reduced back wash could give 15% energy savings.
- Reduced chemical consumption, chlorine & flocculants
- Expected life expectancy is 5 to 10 yrs.