CE 480 Final Presentation
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Transcript of CE 480 Final Presentation
CE 480PROJECTSPRING 2015By:
Fahad Alhargan
Harsha Pasupuleti
Yojitha
Outlines:
• INTRODUCTION (objectives, SIUE WWTP, and solids
test)
• METHEODLOGY(SAMPLING, QA/QC,…)
• RESULTS AND DISCUSSIONS
• SLUDGE PRODUCTION
• ANAEROBIC DIGESTION
• PROBLEMS
• QUESTIONS
Introduction
• Municipal WW has solid particles,
organic and inorganic
• Discharge effects; public health and
environment
• WWTP removes contaminates
• Solids, SS, is one of the main
contaminates to be reduced
Introduction
Objective
• Solids reduction in each unit at SIUE
WWTP
• Overall Solids reduction in the plant
• Sludge produced by SIUE WWTP,
represents 50% of operating $
SIUE Wastewater Treatment Plant (SIUE WWTP)
• Location• Advanced wastewater
treatment plant• built in 1963• Treated WW is pumped to
Cougar Lake• The sludge produced used for
agricultural application• Qave =280,000 gal/day,
weekdays < 600,000
SIUE WWTP
SIUE WWTP
Solids Determination
• To know; type of WW dealing with
• Treatment needed
• Comply with discharge requirements
• Ruse
Solids Determination
• Total Solids (TS):TSS +TDS
• Total Suspended Solids (TSS): solids remaining in
the filter after drying at 103 to 105 C.⁰
• Total Volatile Solids (TVS) or Total Volatile
Suspended Solids (TVSS): solids evaporate at 550 C. ⁰
indicate the presence of organic matter in wastewater.
• Total Fixed Solids (TFS) or Total Fixed Suspended
Solids: residual after ignition at 550 C, inorganic ⁰
matter.
METHODOLOGY
Sample Collection
• Grab Sampling
• Samples were collected from SIUE wastewater treatment
plant
• Morning and afternoon
• Collected from 5 locations
SIUE WWTP
METHODOLOGY
• Gravimetric method
• Method 2540(APHA, 1998)
METHODOLOGYMaterials
• Suction flasks
• Graduated cylinders
• Distilled water
• Trays
• Tongs
• Labeled evaporating dishes
• Labeled crucibles
• Fisher glass fiber filters (G6)
• Electronic Balance
• Desiccator
• Muffle furnace
METHODOLOGY
Procedure – Total Solids • Prepare the dishes• Weigh empty dishes on electronic balance which is Tare weight(W1)
• Take the sample into dishes.• S2= 50ml
• S3= 50ml
• S4= 50ml
• S5= 100ml
• S6= 150ml
• Evaporate the sample by heating in oven between 1030C to 1050C.• Cool the dishes gradually in dessicator.• Weigh the dish which consists of residue of sample is known as
gross weight (W2).
METHODOLOGY
CALCULATION
Total Solids (mg/L) = (W2 – W1) ×10^6• Volume of sample(ml)
W1 = Tare weight in grams
W2 = Gross weight in grams
METHODOLOGY
PROCEDURE- Total Volatile Solids
• Place the dish with sample in muffle furnace at 5500C for
about 1hour.
• Cool the samples by placing them in dessicators.
• Weigh the dish with fixed solids-gross weight at
5500C(W3)
METHODOLOGYCALCULATION
Total Fixed solids(mg/L) = (W3 – W1) ×10^6• Volume of sample(ml)
W3= Gross weight @5500C in grams
W1= Tare weight in grams
Total Volatile Solids = (W2 – W3) ×10^6• Volume of sample(ml)
W3= Gross weight @5500C in grams
W2= Tare weigh @1030C in grams
METHODOLOGYPROCEDURE – Total Suspended Solids
• Prepare the crucibles • Place the filter on rough side in the crucible and weigh the crucibles (W1) .
• Place the crucibles on the vacuum flask setup.• Pour the samples into crucibles
• S2= 25ml and 50ml
• S3= 30ml and 50ml
• S4= 10ml and 50ml
• S5= 100ml and 150ml
• S6= 150ml, 250ml and 500ml
• Apply vacuum and rinse the graduated cylinder• Release vacuum and remove crucible from the assembly.• Place the crucibles in oven at 1030C till the filter gets dried up• Use tongs to remove the crucibles from oven and place them in
dessicator for cooling and then weigh the crucibles (W2)
METHODOLOGY
CALCULATION
Total Suspended Solids (mg/L) = (W2 – W1) ×10^6• Volume of sample(ml)
W1 = Tare weight of crucible in grams
W2 = empty crucible + dry filter in grams
METHODOLOGY
Procedure- Total Volatile Suspended Solids
• Put the crucibles with filter in muffle furnace at 5500C for about 1hour
• Cool the crucibles by placing them in dessicator.
• Weigh the crucible (W3)
METHODOLOGY
CALCULATION
Total Fixed Suspended solids(mg/L) = (W3 – W1) ×10^6• Volume of sample(ml)
W3= Gross weight @5500C in grams
W1= Tare weight in grams
Total Volatile Suspended Solids = (W2 – W3) ×10^6• Volume of sample(ml)
W3= Gross weight @5500C in grams
W2= Tare weigh @1030C in grams
METHODOLOGY• Procedure – Settlement Test
• 1000ml of sample (S4) is taken into a graduated cylinder.
• The graduated cylinder is left a side for 30minutes without disturbing.
• The sludge is settled to a certain mark on the graduated cylinder.
METHODOLOGY
The volume of sludge is calculated
SVI, ml/g = Volume of sludge settled
MLSS
MLSS= Mix liquor suspended solids
METHODOLOGY
Quality Assurance and Quality Control
To ensure Quality assurance:
• Samples’ labels • Samples forms that contain full details about each sample Duplicate samples • Equipment calibration• Distilled water test • Most of the experiments was done in the same day of taking the samples • At the end of each experiment
SIUE Wastewater Treatment units:
Primary treatment
Primary clarifier
Screening
Secondary treatment
Aeration Basin
Secondary Clarifier
Chlorine contact tank
Tertiary treatment
Sand Filter
SIUE Wastewater Treatment units
Primary Treatment
• Removal of a portion of suspended solids and
organic matter from the wastewater.
• Consists of Screening and Primary clarifier
SIUE Wastewater Treatment Units
Primary Treatment
Screening
Large solid particles present in the wastewater are
removed
Clarifier
Removal of the solids and BOD present in the water
through sedimentation. Also remove the suspended solids
present in the wastewater through this process.
SIUE Wastewater Treatment units
RESULTS and DISCUSSIONS
• Samples were collected from S2 and S3.
• The total solids and total suspended solids were determined for these samples.
• The average total solids reduced from 1520 mg/L to 1117 mg/L.
• 27% of the total solids are removed from the wastewater.
• The average total suspended solids were reduced from 255 mg/L to 68 mg/L.
• 73% of total suspended solids entering the primary clarifier are removed during
this process.
•
SIUE Wastewater Treatment Units
Secondary treatment
Aeration Basin:
Oxygen is supplied to help the growth of microorganisms that feed on pollutants and form flocs.
Secondary clarifier:
The flocs and solid particles are removed through sedimentation.
SIUE Wastewater Treatment UnitsResults and Discussion
• Samples are collected from S3, S4 and S5
• The total solids, total suspended solids and sludge volume index were determined for
these samples.
• The average total solids reduced from mg/L to mg/L.
• % of the total solids are removed from the wastewater.
• The average total suspended solids were reduced from mg/L to mg/L.
• 92% of total suspended solids entering the primary clarifier are removed during this
process.
• The average sludge volume index is 85 ml/g.
• Range is 50 ml/g to 100 ml/g.
Sludge Volume Index
SVI = (Volume of sludge settled)
MLSS• = 210ml/L×10^3
2472.5mg/L
= 85 ml/G
SIUE Wastewater Treatment Units
Tertiary treatment
• Filter building:
Sand filters remove remaining suspended solids through filtration
SIUE Wastewater Treatment UnitsResults and Discussion
• Samples were collected from S5 and S6.
• The total solids and total suspended solids were determined for these
samples.
• The average total solids reduced from mg/L to mg/L.
• % of the total solids are removed from the wastewater.
• The average total suspended solids were reduced from mg/L to mg/L.
• % of total suspended solids entering the primary clarifier are removed
during this process.
Sludge Production and Mass Balance
• (TSSsludge x QSludge)+( TSSeffluent x Q Effluent)= (TSS influent x Q Influent )
• Qsludge , TSSeffluent , Q Effluent , TSS influent , Q Influent √
• TSSsludge = 23, 621mg/L
• Sludge production, lb/day = = 591 lb/day
SIUE WWTP sludge= 574 to 800 lb/day
Anaerobic Digestion
• 3000 gallons/ day, pumped to, primary
and secondary digester
• Storage is 468,000 gallons
• Methane produced for the heat
exchanger
• No enough methane for other uses
• Digested sludge applies agriculture land
every 167 days
Anaerobic Digester
PROBLEMS
Conclusion
• Discharge limits for solids, permit or EPA
• Morning and afternoon difference
• Primary treatment reduced 73%
• Secondary treatment 92%.
• tertiary treatment 73%
• Overall reduction 41% TS and 99.4% TSS
• Sludge production 591 lb/day
• Anaerobic digestion, methane produced
QUESTIONS
????????????
MORNING RESULTS
AFTERNOON RESULTS
Averages
Sludge production:
TSSsludge x QSludge + TSSeffluent x Q Effluent = TSS influent x Q
Influent
• TSSsludge = 23, 621mg/L
• Sludge production, lb/day = 591 lb/day
Range according to SIUE wastewater treatment plant’s which was given to us by operator Mr. John
23,000 to 32,000 mg/L
Common range for raw sludge plus waste activated sludge:
20,000 mg/L to 50,000 mg/L