Project 5 - More about SIRDO
The association which invented the SIRDO
ALTERNATIVE TECHNOLOGY GROUP Civil Soc.
G.T.A. (Grupo de Tecnología Alternativa, S.C.)
workshop address (no offices):
Inventor of the decomposition process called "SIRDO" (lntegral System for Recycling Organic Waste).
With 15 years of experience in recycling liquid and solid domestic waste.
Departing from ethnobiological principles developed by the Mexican Indians, the ATG has adapted such bio-chemical principles to modern life, in order to preserve and restore the soil for the new generations of Mexico and the world.
The ATG is proud that their system are now installed and operating in 7 states in Mexico.
Arq. Josefina Mena-Abraham, M. Sc.
Alamo 8-16 Col. Los Alamos,
THE ALTERNATIVE TECHNOLOGY GROUP is an NGO created in 1978 to devolop alternate ecological systems for processing human waste into low cost primary productive components such as water for irrigation and bio-fertilizer.
Years of applied research and experimentation yield the "SIRDO", a biochemical system that decomposes waste. Its design grew out of an indigenous Mexican agricultural system known as "Chinampa" still practiced today in Xochimilco, the floating gardens on the outskirts of Mexico City.
As in the Chinampa the treatment of dark water generates sludge of such characteristics that enable its use as "inocula" for aerobic decomposition of solid orgnic waste. Solar energy and controlled environmental factors, within the system, remove pathogens. The process is a Mexican Patent able to produce high quality bio-fertilizer. It eliminates the sludge problem generated by residual water treatment, at the same time as the garbage pollution.
SIRDO can be used in rural or urban environments. The highly adaptable process ranges from an integrated system that recycles solid waste, dark and grey waters for a housing development to a sophisticated domestic solid waste processor.
Technological development of this process has generated: 2 wet and 3 dry systems, each processing different types of waste which produce several different products.
Faecal matter is the main pollutant of the environment and essentially of the water we drink, from a bacteriological and parasitical point of view. For this reason the Mexico City's authorities and the Xochimilco delegation, have joined efforts with ATG in order to implement an adequate alternative: ecological sanitation units.
It is ATG's policy to provide alternatives with leading edge technology at a low cost to respond to real social needs, in order to sustain the environment, for the new generations of Mexico and our planet.
Processes mixed water from conventional sewerage collector
networks; this system is connected to the last register. The sludge
and scum generated are transformed into
soil improvers within a dual chamber covered by a solar collector.
The effluent can be used for irrigation or
be delivered to receptive water sources.
This system combines 3 basic principles which, previously seemed impossible to combine. These are:
The grey water is processed through a slow acting biological filter generating water appropriate to irrigate crops and gardens.
This system processes human and animal excrement with solid waste in a dual compartment chamber which is used alternately for the filling and drying phases on semester cycles. It produces bio-fertilizer free of pathogens. It is a substitute for latrines and includes a dry toilet which eliminates the use of water for sewage.
Dry SIRDO type 6M
Processes only human or animal excrement. Produces fertilizer and soil improver. Includes a dry latrine and a single solar heated chamber.
CEI Chamber (induced stabilization)
Processes solid organic waste from gardens and kitchens, as well as animal excrement in a dual chamber used alternately on a semester cycle for the filling and drying phases. The "inocula" is cured early in the process by adding liquid bacteria.