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Wastewater Treatment
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Wastewater Treatment
Occurs at designed plants that accept municipal
sewage from homes, business, and industrial sites
Raw sewage is delivered to the plant through a
network of pipesTreated water is discharged into the surface water
environment or used for another purpose
Divided into three categories; primary, secondary,
and advanced treatment
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Sewage Treatment Process
Landfill/mine reclamation
Secondary Treatment
Air
Rawsewage
Grit
ChamberSludge
Digester
Activated
Sludge
Sludge drying beds
Sedimentation
Tank
Aeration TankFinal
Sedimentation
Tank
Screens Rivers, lakes,
oceans, etc.
Primary Treatment
Disinfection
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Sewage Treatment Process
Primary Treatmentremoves 30% -40% of the pollutant volume inthe form of suspended solids and organic matter
Screenremoval of large floating material
Grit Chamberremoval and disposal of sand, small stones andgrit
Primary Sedimentation Tankparticulate matter settles out toform the sludge
Secondary Treatment - removes 90% of the pollutant
Aeration tank the waste water is pumped with air
Final Sedimentation Tankthe sludge settles out
Digesterthe sludge from the primary and secondary sedimentationtanks are where it is treated with an anaerobic bacteria
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Sustainable Water Use
Sustainable water use the use of water resources bypeople that allow our society to develop and flourishinto an indefinite future without degrading the variouscomponents of the hydrologic cycle
Criteria Develop water resources in sufficient volumes to maintain human
health and well-being
Provide sufficient water resources to guarantee the health andmaintenance of the ecosystem
Ensure the minimum standards of water quality for the varioususers of water resources
Promote the use of water-efficient technology and practice
Gradually eliminate water pricing policies that subsidize theinefficient use of water
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Sustainable Water Use
Water Conservation the careful use and protection of waterresources and involves both the quantity of water used and its quality
Water Management
Wastewater Renovation and Conservation Cycle
Three Major Steps: Return of treated wastewater to crops via sprinkler or other irrigation
system
Renovation or natural purification by slow percolation of the wastewaterthrough the soil, to eventually recharge the groundwater resource withclean water
Reuse of the water by pumping it out of the ground for municipal,industrial, institutional, or agricultural purposes
Water Reuse the use of the wastewater following some sort oftreatment
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Existing Philippine Laws
DAO 34 - Revised Water Usage &
Classification / Water Quality Criteria
DAO 35 - Revised Effluent Regulations of
1990
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Water Classification
Fresh Surface Waters (rivers, lakes,
reservoirs, etc.)
Class AA- Public Water Supply Class I
- uninhabited and protected watersheds,
requires only approved disinfection inorder to meet the National Standards for
Drinking Water (NSDW)
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Class A- Public Water Supply Class II
- sources of water supply that requires
only complete treatment (coagulation,sedimentation, filtration, & disinfection) in
order to meet the NSDW standards
Class B- Public Water Supply Class III
- for primary recreation such as bathing,
swimming, skin diving, etc. (particularlythose designated for tourism purposes)
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Class C
*Fishery Water
- for the propagation & growth of fish & aquaticresources
*Recreational Water Class II
- boatings, etc.
* Industrial Water Supply Class I-for manufacturing processes after treatment
Class D
* for agriculture, irrigation, livestock watering, etc.* Industrial Water Supply Class II
- cooling, etc
*other inland waters
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Coastal & Marine Waters
Class SA
- water suitable for propagation, survival &
harvesting of shellfish for commercial
purposes- tourist zones & national marine parks &
reserves
- corral reef parks & reserves
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Class SB
* Recreational Water Class I- areas regularly used for bathing,
swimming, skin diving, etc.
* Fishery Water Class I- spawning areas for bangus & other
similar species
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Class SC
* Recreational Water Class II
- boating, etc.
* Fishery Water Class II
- commercial & sustainance fishing
* Marshy &/or mangrove areas declared as fish &wildlife sanctuaries
CLASS SD* Industrial Water Supply Class II
- cooling, etc.
- other coastal & marine waters
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