Post on 22-Dec-2015
transcript
CE 370CE 370
Introduction to Water and Introduction to Water and Wastewater Treatment PlantsWastewater Treatment Plants
Types of UnitsTypes of Units
OperationsOperationsSedimentation, filtration, flotationSedimentation, filtration, flotation
ProcessesProcessesCoagulation, GAC adsorption, chlorination, activated Coagulation, GAC adsorption, chlorination, activated
sludgesludge
Water Treatment PlantsWater Treatment Plants
Common Surface Water Treatment PlantsCommon Surface Water Treatment PlantsFiltrationFiltrationSofteningSofteningChlorinationChlorination
Common Groundwater Treatment PlantsCommon Groundwater Treatment PlantsSofteningSofteningGas stripingGas stripingChlorinationChlorination
Degree of TreatmentDegree of TreatmentGroup
NumberMax Permissible Average MPN Total
Coliform Bacteria Per MonthTreatment Required
1 MPN not more than 1.0 None for protected ground water, but, at the maximum, chlorination for surface water
2 MPN not more than 50 Simple chlorination or equivalent
3 MPN not more than 5000, and this MPN exceeded in not more than 20% of samples
Rapid sand filtration (including coagulation) or its equivalent plus continuous chlorination
4 MPN greater than 5000 in more than 20% of samples and not exceeding 20,000 in
ore than 5% of the samples
Auxiliary treatment such as pre-sedimentation or pre-chlorination or its equivalent (either separately or combined) or pre-sedimentation for 30 days or more plus rapid sand filtration and chlorination
5 MPN exceeds Group 4 Prolonged storage or equivalent to bring within Groups 1 to 4
Other Parameters that Affect the Other Parameters that Affect the Selection of the Degree of TreatmentSelection of the Degree of Treatment
Physical CharacteristicsPhysical Characteristics Inorganic ChemicalsInorganic Chemicals Organic ChemicalsOrganic Chemicals RadionuclidesRadionuclides
Ease of removal by the selected treatment Ease of removal by the selected treatment schemescheme
Design ParametersDesign Parameters
The plant is designed based on the average The plant is designed based on the average flow on the day of maximum demandflow on the day of maximum demand
The clear well, which provides storage, is The clear well, which provides storage, is designed so that the plant may operate at a designed so that the plant may operate at a constant rate on the day of maximum demandconstant rate on the day of maximum demand
Groundwater Treatment PlantGroundwater Treatment Plant
Q
CSA
Well
CO2
H2S
Cl2
Clear Well or Ground Storage
Pump
Wastewater Treatment PlantWastewater Treatment Plant
Activated Sludge ProcessesActivated Sludge Processes Tertiary TreatmentTertiary Treatment Physical-chemical TreatmentPhysical-chemical Treatment Activated Sludge for Industrial WastewaterActivated Sludge for Industrial Wastewater
Completely mixedCompletely mixedDispersed plug-flowDispersed plug-flow
Aerated Lagoons for Industrial WastewaterAerated Lagoons for Industrial Wastewater