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PROJECTS EXAMPLES OF LAGOON ECOSYSTEM RESTORATION PROJECT LAC DE TUNIS - 1984-1988; 1996-2003 Extreme blooms of macro-algae Ulva characterised the poor water quality of the lagoons; nutrient release was reduced by dredging muddy sediments; water quality was further improved by a better water circulation via sluices that open with the incoming and outgoing tidal waters. A hydrological/ecological model was used to design operating scenarios. PROJECT JEDDAH CITY CENTRE REDEVELOPMENT - 2001 - 2006+ AE3 contributed to a plan of action to improve the water quality in the inner city lagoons onto which wastewater was discharged. The effect of improved water movement and circulation on recovery of the lagoon/bay ecosystem was calculated with and ecological model designed by AE3, that was using input from a hydrological model of Alkyon. EXAMPLES OF ECO-ENGINEERING PROJECTS SEPARATION OF BIOMASS AND NUTRIENTS IN WATER: A PERIPHYTON REACTOR - 2006+ On solid surfaces submerged in illuminated nutrient-rich water phototrophic biofilms develop; these may become several mm thick. These so-called periphyton algae also grow on reed in artificial wetlands fed with wastewater effluent; in a project with a water board the growth of biofilms grown on plates and rods was measured in order to calculate the storage capacity of nutrients and metals. Based on that principle AE3 developed the STACK FBR©, a basic type of a phototrophic biofilm reactor. Periphyton, growing at a rate of 40 g/m2/d, removed up to 0.25 g P/m2/d and 0.40 g N/m2/d from effluents; it served as food for cultured animals (periwinkles, worms). This periphyton contained 11% fatty acids (3% omega-3 fatty acids) on a dry-weight basis; it also produced valuable exopolymers (polysaccharides) that provide the cohesion of the filamentous diatoms. Until 2013, AE3 developed a demo-reactor (with Van Antwerpen Milieutechniek BV) that is fully automated (biomass sensing/harvesting). Water (effluents) of potential end-users of the periphyton reactor will be used to produce algae for biobased applications. The periphyton reactor can be scaled up and be used in aquaculture, agriculture and related industries for a separation of nutrient-rich biomass and cleaned recyclable water. OTHER RUNNING PROJECTS:   INFLUENCE OF LOW-ENERGY ULTRASONIC: UPON ALGAL CULTURES UPON ZOOPLANKTON UPON HARMFUL ALGAE SALINE GROUNDWATER FOR AQUACULTURE: MODIFICATION OF COMPOSITION FOR BALANCED ALGAL GROWTH BIO-ASSAYS TO ESTABLISH LIMITATION AND EXCESS OF ELEMENTS Details of these running projects are available on request...