Agriculture
August 30, 2019
Updated on August 25, 2020
·Created on August 25, 2020
An Arborloo is an ecological sanitation toilet in which trees are planted on top of the full pit while the superstructure, ring beam and slab are moved from pit to pit in a continuous cycle.
The Arborloo is a shallow pit on which a tree can be planted after it is full, while the toilet superstructure, ring beam and slab are moved to a new pit in a continuous cycle (usually moved once every 6 to 12 months). The pit should be about 1 to 1.5 m deep and should not be lined as it would prevent the tree or plant from growing properly.
The tree or plant should not be directly planted in the raw excreta. It should be planted in the soil on top of the pit, allowing its roots to penetrate the pit contents as it grows.
Arborloo designs will vary between communities but the ecological sanitation principle remains the same. It can be applied in rural, peri-urban, and denser areas if space is available.
Market Suggested Retail Price
$22.00
Distributors / Implementing Organizations
Implemented by various organisations including Catholic Relief Services in East Africa, Water, Agroforestry, Nutrition and Development Foundation (WAND) in the Philippines
Manufacturing/Building Method
The Arborloo is constructed in a series of stages involving a concrete slab, ring beam to protect the pit, and superstructure. The superstructure is most often made from local materials and will vary between the location and level of investment the household is willing to make for the superstructure (e.g. woven reeds, sticks, bricks, cement). The household generally provides the labor to dig the shallow pit and build the Arborloo, which approximately takes 2-5 hours. After the Arborloo is constructed, a layer of leaves, ash, or soil is placed in the pit prior to its use by the household. Once the pit is approximately two-thirds full, the pit is backfilled with a thick layer of soil and a tree is planted on the nutrient-rich pit. The household digs another Arborloo pit once the first one is filled, and the concrete slab and superstructure are moved to the new pit. The superstructure, ring beam and slab are moved from pit to pit in a continuous cycle.
Intellectural Property Type
Open Source
User Provision Model
The Arborloo is an open-source design. It is commonly built by the end-users with local construction support where available.
Distributions to Date Status
Unknown
Toilet type
Pit latrine
Evacuation method
Dry; a tree or plant is planted on the full pit while the structure is moved to another pit in a continuous cycle
Storage conditions
Pit
Capacity (L)
~500-700 L Based on 0.8 m pit diameter and 1-1.5 m pit depth
Time until emptying
Design Specifications
The Arborloo design is comprised of three main parts:
Technical Support
Local technicians and NGOs who are experienced in ecological sanitation in the respective country.
Replacement Components
Replacements and repairs are carried out by the end-users with local construction support where available.
Lifecycle
6-12 months prior to planting and cycling Arborloo to a new pit.
Manufacturer Specified Performance Parameters
Specified performance targets generally referred to for the Arborloo are summarised below:
Vetted Performance Status
The Arborloo is mainly assessed for its applicability in rural environments in the context of promoting sanitation noting its varied designs as an open-source solution. This assessment has been undertaken by various organisations through field trials and case studies. Common conclusions include its recommendation as a preferred solution in rural environments because of its low costs, ease of construction and quick return on investments.
Safety
Covering the pit and planting a tree reduces risk of infection due to reduced human contact with faeces contained below a layer of leaves and topsoil for separation. Users do not come into contact with faecal material reducing risk of pathogen transmission.
Complementary Technical Systems
Complementary technical systems include roofing structure to protect end-user from weather, vent pipe with fitted fly screen and pedestal for end-user comfort. Soil and ash should also be readily available to be dispatched into the pit after each use to reduce fly and odour nuisance.
Academic Research and References
Dionna, F,. et al., 2015, Adoption and sustained use of the Arborloo in rural Ethiopia: a cross-sectional study. Journal of Water, Sanitation and Hygiene for Development, Vol 5., Issue 3, pp. 412–425
Shewa, W., Geleta, B., 2010, Arborloo for household sanitation, Arba Minch, Ethiopia. Case study of sustainable sanitation projects
Morabito, P., 2014, Plastic Arborloo Bases for Haiti. Multidisciplinary Senior Design Conference.
Simpson-Hebert, M., 2007, Low-cost Arborloo offers Ethiopians health and agriculture benefits. Waterlines, Vol. 26, no. 2, pp. 12-14.
Compliance with regulations
Unknown
Other Information
None
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