8/6/2019 MARK Poster Final

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Background

ProjectIn December 2009, MARK traveled to Cochabamba,Bolivia to work on an infrastructure developmentproject in a local community. While abroad, MARKcollected data for a project and returned to campuswhere they completed the design during Spring 2010.MARKs project consists of a design for treating thewastewater flow from the Colcapirhua MunicipalMatadero, a cattle slaughterhouse.

LocationThe Matadero is located in Colcapirhua, about 5 mileswest of Cochabamba, Bolivia. The urban sprawl of themunicipality has expanded into the neighborhood ofthe Matadero which was originally located outside ofcity limits.

Methods and Procedures

Existing Conditions

Existing Site Layout:Most of the land area on the project site is either already occupied or beingused. The major structures are illustrated in the i mage here. It was discoveredthat an older septic tank was buried south of the Matadero building.

Design Options Conclusion

Remaining feasible solutions & setbacks Traditional septic tank for primary treatment

Too high BOD5 & TSS loading; will not fit on property Facultative pond for secondary treatment

Too high flow rate; will not fit on property

MARK recommends three alterations:1. Water conservation practices

The Matadero flow would be reduced by approximately 60% byinstalling shut off nozzles on hoses and aerators on the faucets

2. Prescreening system A screen bucket at the trench drain and strainers on the sink drains of

remove larger solid particles and reduce the TSS.3. Reuse of existing system

The Matadero BOD5 loading would be reduced by approximately 30%

Water Sampling and Testing:Sample 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 by:Surveying Public survey

S oi l Sa mp li ng W at er T es ti ngFlow Estimating (Mass Balance)

Colcapirhua Cochabamba

Matadero

Adjacent land

Soccer Field

MataderoDesign Parameters:

BOD5 & TSS Flow

2-Stage Design Options:1. Primary treatment2. Secondary treatment

Existing Septic Tank

Water Tower

Pump Station

Matadero building

Vacant building

Office & 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 solution:1.Water conservation practices2.Prescreening system3.Reuse of existing chambers4.Traditional septic tank as primary treatment5.Facultative pond as secondary treatment

Water Conservation:

Prescreening:

Traditional Septic Tank (located onMatadero site):

Septic tank profile view:

Reuse Sedimentation Basin (Chamber 8):

Facultative Pond (located on thesoccer field):Free Water Surface Sub-Surface Flow

Parameter Units Sample1 Sample2 Sample3 Sample4

Dissolved Solids mg/L 936 9712 808 692

Settleable Solids mL/L 30.0 34.0 2.0 0.7

Suspended Solids mg/L 2570 2269 562 150

Total Solids mg/L 3524 15354 1372 964

Nitrates mg/L NO3 0.5 10.0 0.9 0.3

Nitrites mg/L NO2 0.1 0.4 0.1 0.1

pH -- 6.2 6.6 6.5 7.6

COD mgO2/L 3009 10003 1601 588

BOD5 (interpolated from COD) m gO2/L 1505 5002 801 294

Water Testing Results:

OperationThe Matadero is a cattleslaughterhouse funded andoperated by the local Colcapirhuamunicipality. Currently, the waste ispiped through a series of chamberson the Matadero property before itis pumped and discharged withouttreatment into a nearby river.

3 Effluent Options to be researched by others:Return to Pampamayu CanalFuture integration into domestic wastewater treatment plantHolding tank

Design of Wastewater Treatment Solutionfor the Colcapirhua Municipal Matadero

University of South Florida 2009 International Capstone Design Madelyn Rubin and Angela Krause