design of wastewater treatment solution for the colcapirhua
TRANSCRIPT
Background
ProjectIn December 2009 MARK traveled to Cochabamba Bolivia to work on an infrastructure development project in a local community While abroad MARK collected data for a project and returned to campus where they completed the design during Spring 2010 MARKrsquos project consists of a design for treating the wastewater flow from the Colcapirhua Municipal Matadero a cattle slaughterhouseLocationThe Matadero is located in Colcapirhua about 5 miles west of Cochabamba Bolivia The urban sprawl of the municipality has expanded into the neighborhood of the Matadero which was originally located outside of city limits
Methods and Procedures
Existing Conditions
Existing Site LayoutMost of the land area on the project site is either already occupied or being used The major structures are illustrated in the image here It was discovered that an older septic tank was buried south of the Matadero building
Design Options Conclusion
Remaining feasible solutions amp setbacksbull Traditional septic tank for primary treatment
Too high BOD5 amp TSS loading will not fit on propertybull Facultative pond for secondary treatment
Too high flow rate will not fit on propertyMARK recommends three alterations1 Water conservation practices
bull The Matadero flow would be reduced by approximately 60 by installing shut off nozzles on hoses and aerators on the faucets
2 Prescreening systembull A screen bucket at the trench drain and strainers on the sink drains of
remove larger solid particles and reduce the TSS3 Reuse of existing system
bull The Matadero BOD5 loading would be reduced by approximately 30
Water Sampling and TestingSample 1 Large sedimentation chamberSample 2 Inside slaughterhouse within pipe network Sample 3 Inside pump stationSample 4 Rio Rocha downstream raw sewage discharge
While in country MARK gathered data bySurveying Public surveySoil Sampling Water TestingFlow Estimating (Mass Balance)
Colcapirhua Cochabamba
Matadero
Adjacent land
Soccer Field
MataderoDesign Parameters
bull BOD5 amp TSS bull Flow
2-Stage Design Options1 Primary treatment2 Secondary treatment
Existing Septic Tank
Water Tower
Pump Station
Matadero building
Vacant building
Office amp guard house
Storage building
Primary Treatment (L to R) Traditional septic tank Imhoff septic tank
Secondary Treatment (L to R) Trickling Filter Pozo Ciego System Facultative Pond Drain Field Constructed Wetland
MARK recommends a 5-stage solution1Water conservation practices2Prescreening system3Reuse of existing chambers 4Traditional septic tank as primary treatment5Facultative pond as secondary treatment
Water Conservation
Prescreening
Traditional Septic Tank (located on Matadero site)
Septic tank profile view
Reuse Sedimentation Basin (Chamber 8)
Facultative Pond (located on the soccer field)Free Water Surface Sub-Surface Flow
Parameter Units Sample 1 Sample 2 Sample 3 Sample 4Dissolved Solids mgL 936 9712 808 692Settleable Solids mLL 300 340 20 07Suspended Solids mgL 2570 2269 562 150Total Solids mgL 3524 15354 1372 964Nitrates mgL NO3 05 100 09 03Nitrites mgL NO2 01 04 01 01pH -- 62 66 65 76COD mgO2L 3009 10003 1601 588BOD5 (interpolated from COD) mgO2L 1505 5002 801 294
Water Testing Results
OperationThe Matadero is a cattle slaughterhouse funded and operated by the local Colcapirhua municipality Currently the waste is piped through a series of chambers on the Matadero property before it is pumped and discharged without treatment into a nearby river
3 Effluent Options to be researched by others Return to Pampamayu Canal Future integration into domestic wastewater treatment plantHolding tank
Design of Wastewater Treatment Solution for the Colcapirhua Municipal Matadero
University of South Florida 2009 International Capstone Design Madelyn Rubin and Angela Krause
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