Sustainable Safe Water solutions for Haiti

Safe and Sustainable Treatment Methods for Haiti.

Providing safe and sustainable water in Haiti is complicated by geologic, ecologic, sociologic, and economic factors.   Those seeking to help provide clean water to Haiti must consider and address these factors to provide safe and sustainable water for Haiti.  These four factors are interrelated in complex ways that make solutions complex, and by their nature interdisciplinary and transdisciplinary. 

Geologic Factors

The geology of Haiti consists of a core of igneous rocks which forms the backbone of the island of Hispaniola and the border between Haiti and the Dominican republic.  This core is surrounded in much of the mountains by sedimentary rocks consisting of limestones and shales.  Limestones have fissures and fractures which have been enlarged by dissolution in a process referred to as karstification or simply karst.  The karst aquifers are particularly prone to contamination with water-borne pathogens.  Near major rivers and in the large basin occupied by Port au Prince sufficient alluvium has accumulated to form alluvial fans and alluvial aquifers.  These aquifers, although more effective at filtering pathogens than karst limestone are prone to contamination from long term sanitation and industrial practices.

Ecologic Factors

One of the most common things people think of when someone mentions Haiti is poverty, but running a close second is deforestation, soil erosion, and a generally devastated ecosystem.  What people may not think of is the microbiotic ecosystem which is an integral part of the macrobiotic ecosystem which has also been devastated.  Both the microbiotic and macrobiotic (trees and plants) provide a first line of defense for protecting groundwater in Haiti from contamination.

Sociologic Factors

Attitudes and perceptions of water in Haiti are affected by religious attitudes, historic practices, and the general educational level of most rural Haitians.  Many Haitians who practice Voodoo view water as sacred.  Waterfalls and springs are generally viewed as sacred places in Voodoo for their natural beauty and provision.  Catholicism also views water as sacred but in a way more connected to God and the cleansing power of water.  Both of these viewpoints are predisposed to view water as clean and sacred even when it is contaminated with pathogens that can kill, especially when those pathogens are not visible and the water appears clean.

Economic Factors

Haiti is a very impoverished country with many people living close to the edge of survival.  Water in large cities is often provided by central systems of fountains.  Many also buy water that has been treated in bottles and bags.  In the mountains of Haiti central water systems and bottled water are not available so many drink untreated water from springs.  A simple solution for ensuring the safety of this water would be to boil all water but many do not have the money to buy fuel for sterilizing water and cooking their meals.  Many are also unaware that the water is unsafe because it looks clean and may be collected from a spring emerging from a rock.

Table 1 below is a summary of treatment methods applied in Haiti and other countries.  This list is continually evolving so if you have suggestions or additional methods please e-mail me at wamplerp@gvsu.edu.

Method

Pros

Cons

Cost

Sustainability

Links

SODIS

Passive Solar Disinfection

Cheap; reuse bottles; simple

Water is warm; have to wait for water; turbidity sensitive

$

High

http://www.sodis.ch/methode/anwendung/index_EN 

Plastic Biosand Filters

Effective; once primed provide quick water treatment

Time needed to develop biofilm; skill required to maintain; support needed; turbidity sensitive

$$$$$

Moderate

http://www.hydraid.org/

Concrete Biosand Filters

Effective; once primed provide quick water; can usually be built in country with local materials

Heavy and difficult to transport and move; skill required; turbidity sensitive

$$$$

Moderate

Biosand Filter.org Fact Sheet

Chlorine

Very effective when used properly; cheap

Bad taste to water; skill required; potential negative health impacts; doses vary depending on product being used

$

High

http://www.ag.ndsu.edu/pubs/h2oqual/watsys/ae1046w.htm

Boiling

Rolling Boil for 1-3 minutes

Very effective at killing most pathogens

Expensive; contributes to deforestation; have to cool water before drinking

$$$

Moderate

http://wwwnc.cdc.gov/travel/page/water-treatment.htm

Reverse Osmosis

Very effective at removing all pathogens

Very expensive; requires consistent fuel or power; skill required; maintenance required

$$$$$$

Low

Water Treatment Notes from Cornell University

Sawyer Filters

Very effective;

Easy to use when proper education materials are provided

Expensive; may have to sterilize filters regularly; not well suited for areas with turbid water; backwashing can cause contamination

$$$

Moderate

http://www.sawyer.com/water.htm

http://whconference.unc.edu/files/2014/10/murray.pdf 

Clay Filters

Cheap and can be made from local materials

Clay quality can affect treatment; skill required; may not be effective for some viruses and bacteria

$

High

http://pottersforpeace.com/?page_id=63

Ultraviolet Disinfection

Very effective; power requirements low (~ 200 watts for 40 gpm)

Flow rates low; can be complicated to install; maintenance required for bulbs

$$$$

High/Moderate

http://www.freshwatersystems.com/c-616-atlantic-ultraviolet-sanitron.aspx

http://www.ultraviolet.com/water/minipu01.htm

Slow sand filtration

Can be scaled to larger water sources for schools and communities

Initial costs are high and require materials which may not be available on-site

$$$$

High/Moderate

Tech Brief from the National Environmental Services Center

Ozone Disinfection

Does not create harmful byproducts; does not alter taste; no residual chemicals

On-site equipment required is expensive and requires maintenance; ozone is reactive and corrosive

$$$$$$

Low

EPA fact sheet on Ozone Disinfection

In-Situ Filtration (ISF) wells

Can be constructed from local materials with local labor; can provide long term source of clean water with minimal maintenance

Some support and maintenance is required by local community members

$$

High

GSA Abstract about ISF wells presented in 2014

For more information also contact Dr. Peter Wampler



Page last modified April 27, 2017