WATER SUPPLY – FINAL PRESENTATIONAmelia Quilon, Laura Reisenauer, Rayvion Sanford, Sarah Watzman

Participants

SARAH WATZMAN - aka the girl who never frowns !- Third year ME- Bio-digester lead

LAURA REISENAUER- aka the girl who rarely drinks water!- Third year Env.E- Team lead

AMELIA QUILON - aka the girl who only eats peanut butter !- Third year ISE- Tilapia lead

RAYVION SANFORD- aka the girl who severely hates bugs!- Third year Chem.E- Communication lead

Problem

Main Problem• Scope: • MdL frequently loses electricity

that powers their lift pump and distribution pump.

• Objective: • Explore alternative energy

sources to either back-up pumps during power outages or replace grid.

• Increase water storage capacity to mitigate problems occurring when there’s no electricity.

Side Problems• Scope:• MdL has a non-functioning

biodigester.• MdL has a not fully

functional tilapia pond.

• Objective:• Find the root cause of the

biodigester’s problem.• Provide MdL a plan so that

the biodigester becomes a stable, functional piece.

• Repair the tilapia pond. • Develop a yearly schedule

for tilapia harvesting to maximize yield.

Pre-Pre Trip Work

Generator• Requirements: 20 kW

generator needed to overcome initial in-rush.

• $20,000 for 20 kW generator

• $600 for variable frequency driver (another pricey option!)

Additional Storage Capacity

• Cost: $5,000• Feasibility: • 900 pound tank• Support issues – 13,000

pound tank when full• Diameter and dimensions

(Saul confirmed this information)

Is this even a problem? MdL had only used a water truck 2 – 3 times over

several years!

Pre-Trip Work

Biodigester• Discoveries from last trip

– clogged, too many solids, too basic water

• Sump pump is on site• What does the

biodigester need before it can be fully operational?• Poop and H2O!

• Sustainability and training

Tilapia Pond• What has worked already

and what is currently working?• Section 1 is functional• Sections 2 and 3 are leaking

• How can MdL fully utilize the tilapia pond?• Protein source for the

children• Potential revenue

generator?

Objectives Achieved

Biodigester• Benefit analyzed• Contents fully removed • Composting pile

“organized” and dedicated to garden

• Manure on site• Composting posters

created• Gas line replaced• Staff trained and informed

Tilapia Pond• Sections 2 and 3 drained

and cleaned• Sections 2 and 3 patched• Could not be tested for leaks

due to water issues

• Pump has been spliced so it can be used in both sections

• Animal rescue!• Business plan• Rotation Schedule

Future Recommendations

Biodigester• Once enough manure is

obtained, initialize biodigester

• Put compost from kitchens directly into biodigester • For less confusion, only use

kitchen’s compost, not kids!

• Use existing compost pile for garden

• Gas lights by compost area

Tilapia Pond• MdL is already thinking of

re-surfacing the pond.• MdL should stagger each

section to increase the times each year they harvest.

• Use pump in middle section.

• Use spliced hose in large section.

Questions?

Appendix

Biogas Production Analysis

Assumptions: • One 100lb propane tank at MdL gets used every 15 days. • One bucket of compost (approx. 10 pounds) is added to biodigester daily.• 50.3 MJ/kg = energy density of propane (Wolfram Alpha)• 53 MJ/kg = energy density of methane (hypertextbook.com/facts/2004/Billywan.shtml• 265 cubic meters/ton = biogas production from food scrapsCalculations:

Methane:

(Wikipedia)

Propane:

Energy produced from methane created from food scraps is

1/3 of the energy MdL’s propane tanks provide.

Biogas Production Data

Manure Procured Analysis

Installation Volume Analysis

Tilapia Revenue Analysis

Tilapia Production (every 6 mo.)• I tilapia = 1 pound• Section 1: 50 pounds• Section 2: 300 pounds • Section 3: 300-500 pounds (with use of pump)Harvesting Schedule• Each section: 6 months or twice a yearPrice• 1 pound of tilapia = 27 Lempira Revenue

Tilapia Rotational Schedule

Section Jan Feb March April May June

1 Harvest! Stock Mo. 2 Mo. 3 Mo. 4 Mo. 5

2 Stock Mo. 2 Mo. 3 Mo. 4 Mo. 5 Harvest!

3 Mo. 4 Mo. 5 Harvest! Stock Mo. 2 Mo. 3

Section July Aug Sept Oct Nov Dec

1 Harvest! Stock Mo. 2 Mo. 3 Mo. 4 Mo. 5

2 Stock Mo. 2 Mo. 3 Mo. 4 Mo. 5 Harvest!

3 Mo. 4 Mo. 5 Harvest! Stock Mo. 2 Mo. 3

Composting Posters

• Good (Bueno)• Beans (frijoles)• plantains/bananas (platano)• watermelon (sandia)• tortilla (tortilla)• lettuce (lechuga)• tomato (tomate)• pineapple (pina)• rice (arroz)

• Bad (Mal)• Eggs (huevos)• bones (huesos)• meat (carne)• egg shells (cascarde de huevo)• paper (papel)• milk (leche)• cardboard (carton)• plastic (plastico)

Biodigester – Chamber Dimensions

Biodigester – Gas Pipe Dimensions