sewerage treatment plant (stp) 2016
TRANSCRIPT
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Sewerage Treatment Plant (STP)
Upflow Anaerobic Flush Blanket Model(UAFB )
Dr Shyam AshtekarSMBT Medical College Nashik
Jan 2016
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The STP Model
A BC
A: screening and grit removal, B: primary & secondary sedimentation, C: sludge separation and water treatment
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The STP plant• The STP aims to reduce
BOD from 300+ to <30 before water is discharged into river or farms
• The sludge is oxidized and dried to make manure.
• Methane generated in digestion runs the power plant for this STP.
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Screening for solid waste• Sewage is 95%
water, with human and other waste including plastic bags, sanitary pads, grit etc
• The first job is to separate the solid waste by screening
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Solid waste separated
• This is what should not be thrown into toilets and sewers..but we do!
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Grit Chamber
• Removal of sand grit etc.
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Primary Sedimentation (8hrs)• To settle sludge
(organic solid waste)
• The blue pipes collect methane gas going to power generation
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Aeration to help bacterial oxidation of sludge
• The aerobic bacteria need air/O2 to oxidize the sludge
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Secondary Sedimentation (6hrs)• This finally
separates sludge and water and bacterial digestion is still happening
• Sludge is taken off to sludge drying beds from below.
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Sludge drying beds
• Sludge makes a good manure for agriculture
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Liquid chlorine for disinfecting water before discharge
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