dr. heike hoffmann photos / images: eawag/sandec … · 2012. 12. 14. · reuse aspect (ecosan) is...
TRANSCRIPT
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Photos / images:
EAWAG/SANDEC
http://www.rotaria.net/peru3/
SuSanA website
Dr. Heike Hoffmann
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• Needs always a minimum density for urbanization
• Needs always significant investments in order to get started
• Needs always a wastewater treatment plant
with it´s necessity of operation and maintenance and needs
destination of the “products” – treated water, sludge, biogas
• Needs a consolidated settling structure in order to justify the investment,
therefore sanitation almost always comes to late
it is not a solution for settlements, slums or camps
• Needs always water for proper functioning of the sanitation system
Limitation of conventional waterborne sanitation = Flush toilet with sewer and treatment plant
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The poorest people pay the highest prices for drinking water
in almost all over the world.
Limitation of conventional waterborne santiation
UNO: 45% of population worldwide will live
with less than 20 L drinking water / day in 2050.
Flush toilets use up to 50% of the
daily drinking water of a family.
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The poorest population in settlements, rural areas, slums, camps does not have
access to improved sanitary facilities, affected are:
- Regions without (drinking) water supply
- Regions without access to sewage system
- People without sufficient sanitary education
People who do not have access to hygienic sanitary facilities
are socially stigmatized.
Limitation of conventional waterborne santiation
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People who have toilets do not have automatically sanitation
Only 10% of the sewage in the world is treated,
Lack of sanitation always afects the whole society!
Photo: P. Blunier, 2004Photo: P. Blunier, 2004
And
especially
for the
poorest:
Diseases
and lack of
drinking
water
Eutrofization
Contamination Waterborne sanitation created
the culture of “flush and forget”
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The treatment process of fecal material must be adequate to the local situation.
Natural decomposition of feces is limited and not always possible.
Dry latrines (without flush) with pits for urine infiltration are only recommended
- in situations with enough area for new pits
- in situations with enough soil capacity for infiltration
- in situations without high groundwater levels and storm water infiltration
On site sanitation traditional: Arboloo and Fossa Alterna
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Advantage: Water flush and odor trap with small amounts of water.
Disadvantage: relatively high operation necessity and certain contamination risks.
On site sanitation systems – Low flush:
Blackwater Treatment
Sulabh
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Effluent; on site infiltration or treatment (Activated sludge)
Nightsoil/sludge: treatment
Condition: water for flushing, larger wastewater volumes, centralized treatment
Disadvantage: operation necessity for sludge and effluent, contamination risks.
On site sanitation systems:
Flush Toilet with Septic Tank and centralized nightsoil treatment
2. Sludge treatment
1. Effluent treatment
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The new opportunity for onsite sanitation:
Economic Dry Toilet with Urine Separation seats
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Principle:
• Urine separation without flush guarantees totally dry excrements,
• Fecal material (with ash or soil) is mineralized in the soil
• Urine is infiltrated in the soil or can be used as a fertilizer
Recommendations:
• Arid situation without storm water, without high groundwater level.
Experiences:
• Better solution than VIP-Latrine or other Latrine,
• more hygienic, without flies and odor
• Opportunity to use a clean toilet
is necessary for sanitary education.
EcoPit /ARA (Adapted to the reality of Africa): Urine Separation for hygienic conditions
On site sanitation - improved: Pit with separation of urine
Pro
ble
m o
f la
trin
e:
liq
uid
fe
ca
l s
lud
ge
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11
UDDT is the most natural, hygienic and economic solution to treat fecal material
with the opportunity to use the separated sterile urine as fertilizer.
UDDT doesn‟t suppose people to reuse, but reuse is possible (ecosan)
UDDT- Urine Diversion Dehydration Toilet
Most common solution: 2 chamber for fecal dehydration
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UDDT - Container Solution (60L) Filling in 2 - 8 weeks, Feces need further treatment
More simplified installation, more complicate treatment:
Frequent transport of not stabilized fecal material;
treatment: heat compost, biogas, terra preta, mineralization.School in Lima/Peru
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The situation in urban areas as slums and settlements is different: difficult
access, unorganized construction, high fluctuation, unclear ownership of areas,
people are not able or willing to invest in own toilet, have no time left to care for an
proper treatment and no area to onsite reuse or disposal of fecal material.
Limitation: On Site Sanitation tecnologies have been developed for rural situations
Urban situations always need controlled treatment and disposal of sewage/ fecal
material in order to protect the public health and the environment.
Who has the responsibility for urban sanitation?
Simple urine diversion solution Simple VIP Latrine Simple urine collection UDDT vault emptying
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CAPTURE: Dry Toilet with one or two chambers, Urine separation, grey water separation
STORAGE: 2 Ventilated vaults (dehydration) or one vault with 2 containers (60L)
TRANSPORT: Fecal Material: truck, Urine: container (25L) or pipe, greywater: pipe
TREATMENT: Fecal material: Compost, mineralization, urine: storage, greywater: wetland
DISPOSAL or REUSE: Composted or dried feces, fertilizer and treated greywater
Solution: Centralized treatment of Site Sanitation in urban and peri- urban situation
BOLIVIA
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South Africa Durban: World biggest UDDT Project
75.000 UDDT applied and operated in urban settlements
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Efecto del riego con orín:
Dry Urine Separation Toilet
an Urinal (recycled PVC)
Bucket with ash
Covered hole of second
chamber (toilet change)
Untill now 75.000 UDDT
constructed and operated by the
Public Water Company
Families get the Toilet for free
and 200 L dayly drinking water
supply for very economic fee
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- Offer hygienic sanitary condition, no odor, no flies – LOW COSTS
- Sanitary solution without water use and without blackwater production
- Provide a permanent toilet installation: inside the house, with shower
Rotária del Perú – PPP Project with German Cooperation (GIZ) to introduce UDDT in the sanitation market
Until now: 500 UDDT built with the owners, designs adapted on the
traditional construction and economic conditions in the Peruvian areas.
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Peru: > 40% of people without flush toilet; that fact can be seen as oportunity
Dispersed communities in Amazon area
Informal settlements on the dry cost area
Dispersed communities in mountain area
Lima, settlements 4 Mio people
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Vaults with bench and all sanitary installation
was made in different materials by qualified local
persons.
Walls, door, roof were in the responsibility of the
owners.
Construction of
double vault bench UDDT - 1
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Bench in concrete, wood or adobe as well. The bench
is with 2 holes for the toilet seat and 2 for the
ventilation pipe (10 cm) with urine diversion, inside is
the urine pipe (5cm)
Construction of
double vault bench UDDT - 2
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Construction of
double vault bench UDDT - 3
The vaults have are 80 to 100 cm high and
need 1 -3 stair to sit down (38 cm). The area
for shower can be integrated.
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Construction of
double vault bench UDDT - 4
Walls are from different local materials, it is
made bay the owner. The installation can be
integrated in the house, it doesn’t smell.
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Important for the people is to have a toilet, bus the
reuse aspect (ecosan) is secondary:
• Separated Urine is sterile an can be reuse as fertilizer, -
high concentration of Nitrogen, Phosphor and Potassium
• The indigene population use urine for more things like
medicine or for textile fixation of natural plant colors.
• Important: only 25% of people (500 toilets) are willing
and able to reuse the urine, the only other let infiltrate
it in the soil, the organized reuse, especially in urban
settlements will need a collection service.
Lima school garden
Amaru,
Cusco
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Organization:
• Rural situation: two chamber system, total
dehydration, reuse with the community
• Peri-urban situation: two chamber system,
recollection twice a year and reuse or one
chamber system recollection twice a week
and centralized compost with municipal waste
• Public Toilet: always one chamber with
container and recollection with heat compost.
Public toilet in National Park Transportation of fezes and urine Heat compost
Economics:
• Family toilet with shower 250-1000
USD (depend on the participation)
• Public service by wastewater company
is 30-70% more economic than
conventional wastewater treatment
• Each family is economizing 50% de of
drinking water (compared with flush
toilet system ).
Management models for Dry Sanitation
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Greywater is without fecal bacteria„s - treatment is
easy, reuse is economicly, as treatment unit can
be used for instant Constructed Wetland, in the
project were constructed different wetlands:
• Parques de Carabayllo: social housing by
Peruvian Goverment, treatment of greywater and
reuse for irrigation of 16.000 m² green areas .
• Casa de Retiro, Cienaguilla: treatment of
15 m³/d greywater and reuse for flush in all
120 toilets of the hotel.
• Colegio San Christoferus, Lima, treatment of
2 m³ greywater and 4 m³/d blackwater and reuse
for irrigation of green and productive areas .
• Casa de Ancianos en Chincha: Treatment of
7,5 m³ wastewater, irrigation of productive areas
• Different houses with dry toilets are reusing the
treated greywater in their own garden
Participation in “Technology Review of Constructed Wetlands” with GIZ,
see SuSanA website
Chorrillus, Lima
Dry Toilet Sanitation only produces greywater
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Organization of workshop, manual for self construction and for right use and maintenance,
Capacitation is fundamental for sanitation