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Liquid waste
Liquid waste treatment
 Water bodies
 DO
 BOD
 Anaerobic
 Lotic, lentic
 Treatment- 3 stages
 Primary, sec-BOD dec; tert-> mineral,
recalcitrant organic removal
Liquid waste- problems and treatment.ppt
Liquid waste- problems and treatment.ppt
primary
 Screen
 Scum, grease
 Grit settle
 BOD dec
 If only org.solid- upto 70-80%; domestic
sewage- 30-40%
Screening
Liquid waste- problems and treatment.ppt
Settling tank
Secondary treatment
 biological
 anaerobic
 Aerobic
 Fixed film type-Trickling filter, RBC,
Submerged aerobic filters, Fluidized bed
reactor
 Suspended sewage treatment systems
 Oxidation lagoon, Activated sludge
Liquid waste- problems and treatment.ppt
Liquid waste- problems and treatment.ppt
Liquid waste- problems and treatment.ppt
Liquid waste- problems and treatment.ppt
Liquid waste- problems and treatment.ppt
Liquid waste- problems and treatment.ppt
RBC
Liquid waste- problems and treatment.ppt
Liquid waste- problems and treatment.ppt
Submerged Aerobic Filters
Fluidized bed reactor
 Support- pumice, sand , plastic; pump water
up (anaerobic); air/O2 (aerobic)
 Rate- no shear off but fluidised
 SA large
 USB
 More mo
Liquid waste- problems and treatment.ppt
Suspended cell sewage treatment
 Oxidation lagoons- cheap, long retention time
 O2- diffusion (slow), photosyn-> if less O2 ->
odor
 Dep on temp
 treated sewage-> may be recharge ground
water
 Sewage- primary settling-> series of holding
ponds-> microbial biomass settle-> infiltration
pond-> nat. soil, sand-> groundwater
 Problem- clogging-> periodic rest
Liquid waste- problems and treatment.ppt
Liquid waste- problems and treatment.ppt
Activated sludge
 Flocs
 Gram ive rods- coliforms, Ps, Z.ramigera
 Flocs- attached cilliates- suspended bactetia
 Pathogen  dec (cant survive), also reduce in
settling
 Settling of floc- problem- bulking (filamentous bac,
fungi)? highC:N, C:P, low DO
 Sludge- settled-. Recycled, incineration, anaerobic,
composting, landfilling
Liquid waste- problems and treatment.ppt
floc
Liquid waste- problems and treatment.ppt
Liquid waste- problems and treatment.ppt
Liquid waste- problems and treatment.ppt
Bulking causing m.o.
Liquid waste- problems and treatment.ppt
modifications
 UNOX- O2
 ICI
 Anaerobic
 eutrophication
 Removal of P, N
 Alt aerobic, anaerobic (add. Org)
 P- Acinetobacter-Moraxella- Mima
 PHB, P-release (anaerobic), P uptake (aerobic)
UNOX
Liquid waste- problems and treatment.ppt
Liquid waste- problems and treatment.ppt
Liquid waste- problems and treatment.ppt
Anaerobic digesters
 Slow, less E, E gen
 Septic tank- residue to leaching field (aerobic,
far)
 Imhoff tank
Liquid waste- problems and treatment.ppt
Liquid waste- problems and treatment.ppt
Liquid waste- problems and treatment.ppt
Liquid waste- problems and treatment.ppt
 Anaerobic lagoons
 Odor
 Meat packing plant effluents
Tertiary treatment
 Non-biodegradable organic comp, mineral
 Activated C-filters
 P- ppt Ca, Fe
 N- stripping- NH3 at high pH
 Breakpoint chlorination- HOCl (1:1)
 Dec BOD- NOD
 Heavy metals- mo sorbed
 HOCl +NH3-> NH2Cl +H2O
 HOCl + NH2Cl-> NHCl2 +H2O
 2NHCl2 +H2O-> N2 + HOCl + 3H+
+ 3Cl-
Disinfection
 After sec or tert.
 Cl2, NaOCl, Ca(OCl)2
 ClO-
, HOCl=> free residual chlorine
 Oxidant
 Org matter, NH3, Fe2+,
S, Mn
 Some org-> part. Oxidised-> toxic, difficult
 Cl2 + H2O-> HOCl +HCl
 NaOCl +H2O -> HOCl + NaOH

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Liquid waste- problems and treatment.ppt

  • 2. Liquid waste treatment Water bodies DO BOD Anaerobic Lotic, lentic Treatment- 3 stages Primary, sec-BOD dec; tert-> mineral, recalcitrant organic removal
  • 5. primary Screen Scum, grease Grit settle BOD dec If only org.solid- upto 70-80%; domestic sewage- 30-40%
  • 9. Secondary treatment biological anaerobic Aerobic Fixed film type-Trickling filter, RBC, Submerged aerobic filters, Fluidized bed reactor Suspended sewage treatment systems Oxidation lagoon, Activated sludge
  • 16. RBC
  • 20. Fluidized bed reactor Support- pumice, sand , plastic; pump water up (anaerobic); air/O2 (aerobic) Rate- no shear off but fluidised SA large USB More mo
  • 22. Suspended cell sewage treatment Oxidation lagoons- cheap, long retention time O2- diffusion (slow), photosyn-> if less O2 -> odor Dep on temp
  • 23. treated sewage-> may be recharge ground water Sewage- primary settling-> series of holding ponds-> microbial biomass settle-> infiltration pond-> nat. soil, sand-> groundwater Problem- clogging-> periodic rest
  • 26. Activated sludge Flocs Gram ive rods- coliforms, Ps, Z.ramigera Flocs- attached cilliates- suspended bactetia Pathogen dec (cant survive), also reduce in settling Settling of floc- problem- bulking (filamentous bac, fungi)? highC:N, C:P, low DO Sludge- settled-. Recycled, incineration, anaerobic, composting, landfilling
  • 28. floc
  • 34. modifications UNOX- O2 ICI Anaerobic eutrophication Removal of P, N Alt aerobic, anaerobic (add. Org) P- Acinetobacter-Moraxella- Mima PHB, P-release (anaerobic), P uptake (aerobic)
  • 35. UNOX
  • 39. Anaerobic digesters Slow, less E, E gen Septic tank- residue to leaching field (aerobic, far) Imhoff tank
  • 44. Anaerobic lagoons Odor Meat packing plant effluents
  • 45. Tertiary treatment Non-biodegradable organic comp, mineral Activated C-filters P- ppt Ca, Fe N- stripping- NH3 at high pH Breakpoint chlorination- HOCl (1:1) Dec BOD- NOD Heavy metals- mo sorbed
  • 46. HOCl +NH3-> NH2Cl +H2O HOCl + NH2Cl-> NHCl2 +H2O 2NHCl2 +H2O-> N2 + HOCl + 3H+ + 3Cl-
  • 47. Disinfection After sec or tert. Cl2, NaOCl, Ca(OCl)2 ClO- , HOCl=> free residual chlorine Oxidant Org matter, NH3, Fe2+, S, Mn Some org-> part. Oxidised-> toxic, difficult
  • 48. Cl2 + H2O-> HOCl +HCl NaOCl +H2O -> HOCl + NaOH