Page 2 :
Preliminary Treatment, Primary Treatment, Secondary Treatment, Tertiary Treatment
Page 5 :
Preliminary Treatment, Removal of waste water constituents, such as sticks, floatable grit, and, grease that may cause maintenance or, operational problem with the, treatment operations, processes.
Page 6 :
Preliminary Treatment, Preliminary treatment consists of following, units, • Screening, For removal of floating, matter., • Grit Chamber, For removal of sand and, grits., • Skimming Tanks For removal of oil and, grease
Page 7 :
Coarse screen:- spacing between bar opening, 50mm. Disposed of by incineration, burial,, dumping
Page 8 :
Medium screens:- spacing 6 to 40mm. Disposed, of by incineration or burial.
Page 9 :
, , Fine screens: -perforation of 1.5 mm to 3mm, size. These screen get clogged very often &, need frequent cleaning.
Page 11 :
Primary Treatment, Removal of a portion of the suspended, , solids and organic matter from, the wastewater.
Page 14 :
Primary Treatment, Primary treatment consists of following, processes/units, • Sedimentation, •, , Primary Settling Tanks, Secondary Settling Tank
Page 15 :
Primary Treatment Process, Sedimentation is primary treatment, Process., Sedimentation is a physical water, treatment process used to settle out, suspended solids in water under, the influence of gravity.
Page 16 :
Removal Efficiency of Primary, Treatment Process :, • Removal efficiency of Biological Oxygen, Demand (B. O.D.) in primary treatment, process is 30%, • Removal efficiency of Total Suspended, Solids (T.S.S.) in primary treatment process, is 60%
Page 20 :
Secondary Treatment, Removal of biodegradable organic, matter and suspended solids
Page 21 :
Secondary Treatment, Secondary treatment consists of following, processes., • Activated Sludge Process, • Oxidation Ponds, • Trickling Filter
Page 24 :
ACTIVATED SLUDGE, The sludge consist of micro-organism in active state of, decomposition , is known as active sludge
Page 25 :
Activate Sludge Process, In activated sludge process wastewater, containing organic matter is aerated in an, aeration basin in which micro-organisms, metabolize the suspended and soluble, organic matter.
Page 27 :
, , Sludge digestion tank:
Page 28 :
Removal of residual suspended solids, (after secondary treatment),, usually by granular medium filtration., Disinfection is, also typically a part of tertiary treatment.
Page 29 :
Tertiary Treatment Process, Tertiary treatment process consists of following, process., • Filtration Process (Trickling Filter), • Disinfection Process, , Trickling Filter is an attached growth, process i.e. process in which, microorganisms responsible for treatment, are attached to an inert packing material.
Page 30 :
Working of Trickling, Filter
Page 34 :
Tertiary Treatment, Tertiary treatment consists of following, processes and units., •, •, •, •, •, •, , Membrane Filtration and Separation, Dechlorination and Disinfection Systems, Reverse Osmosis (RO) Systems, Ion Exchange, Activated Carbon Adsorption, Physical/Chemical Treatment
Page 36 :
I, N, F, L, U, E, N, T, , E, F, F, L, U, E, N, T
Page 37 :
Secondary Treatment Process, Stabilization ponds or oxidation pond:, • The stabilization ponds are open flow through, basins specifically designed and constructed to treat, sewage and biodegradable industrial wastes., • They provide long detention periods extending from, a few to several days.
Page 40 :
Oxidation Ditch, The oxidation ditch is a modified form, of "extended aeration" of activated, sludge process. The ditch consists of a, long continuous channel oval in shape, with two surface rotors placed across, the channel.
Page 41 :
A Typical Oxidation Ditch
Page 42 :
A View of Oxidation Ditch
Page 45 :
DESIGN CONSIDERATION:, , • Capacity of tank-: W.C. connected 40 to 70, lit/capita/day, sullage discharge 90 to 150 li/capita/day, • Free board:- 0.3 to 0.5m, • Inlet & outlet baffles:-Extend upto top level of scum, but must stop a little below the covering slab., , • Detention period :- 12 to 36 hrs commonly 24 hrs, • Length to width ratio:- L=2 TO 3 B, B should not be less than 90cm, •, depth= 1.2 to 1.8m.
