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