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Water and Agriculture Team: . Montaña de Luz 2010. Members: Peter Dobler Francis Krivanka Chris Ratcliff Kevin Kuhn. Overview. Four main projects: Water Filtration Compost Garden Tilapia Pond. Water Filtration. - PowerPoint PPT Presentation
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Water and Agriculture Team:
Members:Peter DoblerFrancis KrivankaChris RatcliffKevin Kuhn
Montaña de Luz 2010
OverviewFour main projects:
1. Water Filtration2. Compost3. Garden4. Tilapia Pond
Water Filtration• Previously installed by an earlier group,
but was currently disconnected due to a low flow rate out of the system because of the lack of replacement cartridges
• Other options were researched, but the current system was determined to be the best
• MdL kitchen highest priority over director’s house-Vicki
• New version of cartridges
Communication!
• Main problems with previous projects lack of effective communication with MdL stafffocus on this
-Vicki: current staff will sustain projects• Make sure Vicki understands what is going on• Meetings with staff at beginning and end of
week• Placed the instructions for replacing the filters
in the correct order behind the system• Placed the team documentation inEnglish and Spanish on the wall as well,contains appearance, function, cost of filters as well as ordering instructions
Water Testing• Water tested with arsenic kit donated from Hach
• Unfiltered water: 30-40 ppb• Filtered water: about 5 ppb• WHO standard: 10 ppb
• new cartridges work!!• Chlorine also tested with photometer
• Chlorine concentration is still at an adequate level, so no problems there
Future Recommendations
• Make sure the filtration system is being sustained, and that Saul is replacing and installing the filters correctly
• Improve on some of the past water team’s projects-gravity feed system, irrigation, septic system
• Water-related issues with tilapia pond• More effective communication method between
OSU and MdL so that redundant/unnecessary projects don’t happen, OSU group is familiar with what MdL is doing, max benefit for MdL
GardenGoal: Improve Agriculture at MdL
FoodIncome
Problem: WeatherExtreme heatHard rain
Solution: Protect the plantsRoof already in progressShade netting addition
Already in progress Shade netting addition
Future RecommendationsAssessment
How well is the shade roof working?How well is the shade roof holding up?
Put up more shade netting to cover the rest of the garden or more areas if necessary
Compost
Goal: develop a good system for compostingWet vs. dry, greens vs. browns, oxygen
Problem: MdL’s compost area was too full and appeared to be only wet waste
Our solution: Share proper composting techniques with staffUtilize more bins for compostingFill new bins with proper mix of waste
Our Solution
Better SolutionBiodigester
Converts organic waste into biogas and nutrient rich liquid fertilizer, or what could commonly be referred to as compost
Future RecommendationsBiodigester
Talk to Dr. Jay Martin from the Dept. of FABEFigure out what needs to be done in order to
maximize production of both gas and compost Complete installationDevelop clear yet comprehensive notes for
sustainability
Tilapia Culture
Tilapia culture is found throughout the world because it can turn unproductive land into a source of income and nutrition. Can it work for MDL?
Goal: Determine feasibility and provide recommendations on operation and management of tilapia culture at Montaña de Luz
Tilapia pond benefits
• Sustainable – locally available inputs• Nutrition• Economic value• Integration with chickens/garden
Tilapia pond potential issues
• Pond placement/Construction• Oxygen content/Water quality• Feeding• Operating costs
Existing Pond• Active for 6 months• 7 fish/m2 (about 300 fish)
• 95% of fish sterile
• Design Issues• Unnecessary depth
• High cost to aerate• Small Surface Area
• Limited population
Not enough fish – project was not cost effective
Pond Construction
There is space next to the chicken coopClose to the garden
Space for one pond of about 130 m2 (or multiple ponds)1m depthMore smaller harvests or
fewer big harvests?Must use concreteDrain required – should be
connected to garden
13.6m
8.3m
15.6m
12.6m
For tilapia culture to be successful at MDL, new ponds must be built
Problem - Large initial cost
Water Quality
*Bocek, Alex. An introduction to aquaculture. http://www.ag.auburn.edu/fish/international//publications.htm
A technique to measure algae content in the pond.*
• Tilapias are hardy fish • Dissolved oxygen is the major concern
• Tilapia can survive at relatively low oxygen levels
• A shallow pond incorporates oxygen through contact with air
• Algae photosynthesize during the day creating O2
• At night, algae respire and use oxygen
• Algae content must be closely monitored and night time aerators must be used
• 10% of pond water should be replaced every week
FeedingCould be the most expensive part of upkeep• Tilapia will eat a wide variety of food
• Additional sources:- Chicken/garden/meal scraps- Algae - algae growth in the pond can be
stimulated by addition of compost or manure
- Possibility for sustainability• There may be a tradeoff between cost and
growth rate• Concentrate costs 500 Lempira for a 6 pound
bag – Can get very expensive
Bocek, Alex. An introduction to aquaculture. http://www.ag.auburn.edu/fish/international//publications.htm
Tilapia eat naturally occurring organisms in the pond which can be stimulated by addition of manure or chemical fertilizers
Cost Analysis
Fish Value Stocking Cost Electricity Cost Feeding Cost Net
24,570 772 850 13,000 + 9,948 L
Looks promising. Note, however, how much it changes if 1 full bag of feed is needed per week instead of ½ bag.
Fish Value Stocking Cost Electricity Cost Feeding Cost Net
24,570 772 850 26,000 - 3,052 L
Cost analysis based on information received from Universidad Zamorano• Fish @ 27 L/lb• Stocking fry: 85 centimos/fish• Electricity: 18 cents/hr (180 Watt pump for 4 hours a day)• Food: 500 L/6lb
Recommendations• Use old pond for test
• If things go well, build 2 or 3 small concrete ponds next to the chicken coop
• Connect ponds to garden to make use of waste water
• Carefully monitor algae growth• If not enough, add chicken manure
• Experiment with different types of feed to try to minimize costs • Try using scraps from chicken processing
• Determine change in growth rate, if any
The End