Decentralised WWTP for productive purposes

Laurent Stravato - Friday 12 May 2006

Dear Colleagues,
My name is Laurent Stravato and I am currently working for Studio Galli Ingegneria (Italy). I have also worked previously with IRC in the Netherlands and developped some action research projects on low cost technology for household wastewater treatmnent plant.
I am presenting below some comparative data between microphytes, macrophytes lagoons with information such as cost of realization.
Those information describe mainly the sanitation aspect and the water treated with such technologies can't be used for drinking purposes (only productive activities)

Type of lagoon Microphytes Macrophytes

Average Flow
(m3/day) 45 45

Wastewater
origin Household Household

Cost of
realization 8,350 US$ 15,340 US$

Network type Separate Separate

Material of
canalisation PVC PVC +concrete

Length (meter) 548 3400

Different studies elaborated with EIER or CREPA http://www.reseaucrepa.org/ demonstarte that duckweed Microphytes or Macrophytes systems are able to generate
sufficient income for the maintenance and operating of treatment facilities starting already at 1000 habitant equivalents. Once the treatment facilities set up, the maintenance can be financed by means of urban agriculture and inland fisheries bringing important benefits for livelihoods.
Ref:http://www.irc.nl/page/24568

Cordiali Saluti,
Laurent