Title: 2003 Annual Wastewater School for Wastewater Treatment Plant Operators
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3 Session
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4The Global Situation
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Freshwater Availability Scenario (Per Person)
Environmental source draft 2005
7Fresh Water
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The Role of Wastewater
8Meeting The Challenge To Improve Water
Wastewater Quality in The New Millennium
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Physical Characteristics of Waste Water
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Chemical Characteristic of Waste Water
11Where does it all go!
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Where does the water from the washer go?
By gravity flow, the waste is on its way to your
local wastewater treatment plant!
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Level of Treatments
Preliminary Removal of wastewater constituents such as rags, sticks, floatable, grit and greases that may cause maintenance or operational problems with the treatment operations, processes and ancillary systems
Primary Removal of a portion of the suspended solids and the organic matters from the wastewater
Advanced Primary Enhanced removal of suspended solids and organic matter from the wastewater. Typically accomplished by chemical addition or filtration
Secondary Removal of biodegradable organic matter ( in solution or suspension) and suspended solids.
Secondary with Nutrient Removal Removal for biodegradable organics, suspended solids and nutrients (Nitrogen, phosphorous or both)
Tertiary Removal of residual suspended solids (after secondary treatment) usually by granular medium filtration or micro-screens. Disinfection is also typically a part of tertiary treatment. Nutrients removal is often included in this definition.
Advance Tertiary Removal of dissolved and suspended material remaining after normal biological treatment when required for various water reuse applications.
13Conventional Wastewater Treatment Process
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- Pretreatment involves
- Screening
- Grit Removal
- Oil separation
- Flow equalization
- Chemical Treatment is used in conjunction with
the physical and chemical processes - Chemical precipitation
- Adsorption
Sludge Treatment and Disposal involves grinding,
degritting, blending, thickening, stabilization,
conditioning, disinfection, dewatering, heat
drying, thermal reduction, ultimate disposal
- Disinfection can use
- Chlorine compounds
- Bromine Chloride
- Ozone
- UV Radiation
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Flow Sheet of Wastewater Treatment Plant
15Designing a WWTR Scheme
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16Basic Design Parameters Considerations
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17Wastewater Treatment Biological Unit Operations
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18Activated Sludge Process
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19Design of Aeration Systems...
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20To tertiary process
From primary process
Settling collects sludge on bottom
Aeration and rapid mixing
air diffuser
21Aeration Systems
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( 1 ) Compressed air diffusion...
( 2 ) Submerged turbine aeration...
( 3 ) Motor - speed ( high ) surface aeration...
22Advantages/Disadvantages
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23Trickling Filters
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24Advantages/Disadvantages
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25Rotating Biological Contactors (RBC)
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26Advantages/Disadvantages
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27Selection of Technology
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28Chemical Coagulation
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- Lime Heavy metals Alum SS removal
- SS removal P removal
- P removal
- Polymer - SS control Iron SS removal
- P removal
- Mechanism
- Destabilization by ionic charge neutralization
- Reduce charge that keeps small particles apart
Aluminum sulfate
Ferric chloride Ferric sulfate Ferrous sulfate
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29Flocculation
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- Purpose
- Produce larger, more dense floc particles that
will settle or filter easily - Application
- Gentle mixing after rapid mix (coagulation)
- Mixing Mechanical or Aeration
Q
Infl Q
Gentle Mix / Flocculation
Rapid Mix / Coagulation
Sludge
30Costs
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Sewage treatment Plant in PCSIRAeration Tank
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Sewage Treatment Plant in PCSIR
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Wastewater Parameters of Sewage Treatment Plant
in PCSIR
Effluent Results (IN) Effluent Results (IN) Effluent Results (IN) Effluent Results (IN) Effluent Results (IN) Effluent Results (IN) Effluent Results (IN) Effluent Results (IN)
Parameters Unit Different Time Intervals Different Time Intervals Different Time Intervals Different Time Intervals Different Time Intervals Different Time Intervals
Total Dissolved Solids (TDS) mg/L 1695 960 931 1102 1068 1057
Suspended Solids mg/L 324 301 287 277 304 305
BOD5, 20oC mg/L 124 127 131 120 115 130
COD mg/L 219 212 208 227 205 221
Chlorides mg/L 50 69 55 63 70 54
Sulphide mg/L 11.5 9 4 10 5 9
Treated Wastewater Results (OUT) Treated Wastewater Results (OUT) Treated Wastewater Results (OUT) Treated Wastewater Results (OUT) Treated Wastewater Results (OUT) Treated Wastewater Results (OUT) Treated Wastewater Results (OUT) Treated Wastewater Results (OUT)
Parameters Unit Different Time Intervals Different Time Intervals Different Time Intervals Different Time Intervals Different Time Intervals Different Time Intervals
Total Dissolved Solids (TDS) mg/L 1688 941 902 1069 1049 1032
Suspended Solids mg/L 7 5 5 4 7 5
BOD5, 20oC mg/L 12 8 10 9 7 9
COD mg/L 19 22 18 18 16 19
Chlorides mg/L 50 69 55 63 70 54
Sulphide mg/L 1 1 0 0 0 1
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BOD, COD and TSS Comparison (IN OUT)
36Effluent Disposal and utilization
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Use of Sewage Treatment Plant for Agriculture
Sector
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Use of Sewage Treatment Plant for Agriculture
Sector
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Use of Sewage Treatment Plant for Agriculture
Sector
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Use of Sewage Treatment Plant for Agriculture
Sector
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Positive Effects of Wastewater
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Negative Impacts of Wastewater
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Conclusion
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Acknowledgment
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For any question, Please
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