Chapultepec WWTP Reuse and aquifer recharge project...
Transcript of Chapultepec WWTP Reuse and aquifer recharge project...
Chapultepec WWTPReuse and aquifer recharge project for sustainable management of water resources in Mexico City
ISMAR 9June 2016
Alejandro Zuluaga
Chapultepec WWTP: Reuse and Aquifer Recharge - ISMAR 9 - June 20161 I
Summary
Chapultepec WWTP: Reuse and Aquifer Recharge - ISMAR 9 - June 20162 I
• Context: Water resources in Mexico City
• Chapultepec WWTP project• Objectives: Reuse and Aquifer Recharge• Water treatment Line• Technologies• Guarantees
• Aquifer recharge• Polishing treatment• Treatment line• Guarantees
• Conclusions
Context: Water resources in Mexico City
Chapultepec WWTP: Reuse and Aquifer Recharge - ISMAR 9 - June 20163 I
Context: Water resources in Mexico City
High percentage of the population and part of the economy of the region depends on the water resource
Chapultepec WWTP: Reuse and Aquifer Recharge - ISMAR 9 - June 20164 I
Pressure on water resources on the Valley of Mexico was estimated at 136% in 2013 and 138% in 2014
Actual overexploitation of groundwater resources in the Valley of Mexico is estimated at 23 m3/s
Actual overexploitation of the aquifer of the metropolitan area of Mexico city is estimated at 3,5 m3/s
Around 75% of the 20 million inhabitants of the metropolitan area of Mexico city depend on groundwater resources
Around 11 m3/s in the Valley of Mexico are used for agriculture
Chapultepec Wastewater Treatment Plant (WWTP)
Chapultepec WWTP: Reuse and Aquifer Recharge - ISMAR 9 - June 20165 I
Chapultepec WWTP project: Objectives
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Increase water reuse in order to reduce water scarcity and preserve the forest of Chapultepec Satisfy water needs of the forest of Chapultepec (lakes of Chapultepec
and irrigation of the forest) Aquifer recharge
Improve water quality of the lakes
Improve water infrastructure
Chapultepec WWTP: General scheme
Chapultepec WWTP: Reuse and Aquifer Recharge - ISMAR 9 - June 20167 I
Chapultepec WWTP
Chapultepec LakesWastewater 2 Polishing
WTP
Irrigation Chapultepec
forest
Aquifer recharge (2x2 injection wells)
Chapultepec WWTP: Location
Chapultepec WWTP: Reuse and Aquifer Recharge - ISMAR 9 - June 20168 I
Chapultepec WWTP
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Chapultepec WWTP: Treatment line
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Pretreatment Biological reactor
Membrane Biological Reactor
Wastewater
UV Disinfection
Sludge Chapultepec Lakes
Chapultepec WWTP: Features
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Carbonaceous and nutrient removal (N&P)
Odor treatment
Reduced footprint (no need of clarifier and sand filtration)
Excellent treated water quality (0,035 microns membrane cut off)
UV disinfection → No disinfection byproducts
Chapultepec WWTP: Ultrafor™ technology
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Chapultepec WWTP: Ultrafor™ technology
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Physical barrier → constant water quality
0,035 microns membrane cut off Total removal of pollens, Yeasts
bacteria and smallest microorganism
Removal of most colloids, viruses and macro-organic molecules
Guarantee of sanitation
Small footprint
Automated operation
Chapultepec WWTP: Treated water guarantees
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Parameters Process Guarantees
COD < 50 mg/l
BOD5 < 20 mg/l
TSS < 20 mg/l
N tot < 8,5 mg/l
P tot < 2 mg/l
Total coliforms < 240 / 100 ml
Fecal coliforms < 240 /100 ml
Aquifer recharge
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Polishing treatment: 2 Water Treatment Plants
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Polishing treatment: Treatment line
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Pretreatment Ultrafiltration Membranes
Reverse Osmosis
Lakes
UV Disinfection
Injection wells
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Polishing treatment: Features
UF filtration for suspended solids and microorganisms removal
Reverse Osmosis for removal of organic compounds, pesticides and other components
UV disinfection to avoid any disinfection byproduct
Polishing treatment: Treatment capacity
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Polishing treatment: Guarantees
Comply with NOM 014 - Requirements for artificial aquifer recharge with treated waste water
Total removal or inactivation of pathogen microorganisms
Comply with NOM 127, Drinking water parameters
TOC ≤ 1 mg/l
Conclusions
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Conclusions
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Reuse and aquifer recharge are a solution for the water scarcity problem of the Valley of Mexico and the Metropolitan Area of Mexico City
Chapultepec WWTP is an example to follow for the sustainable management of the water resource
The technologies used allow to comply with the water quality requirements needed for a direct recharge of the aquifer and the stringent footprint requirements of the proyect