|M.Sc Student||Khanakhis Boris|
|Subject||Comparison of Aquatic Plants Based Systems for Wastewater|
|Department||Department of Civil and Environmental Engineering||Supervisor||Professor Emeritus Michal Green|
The thesis is
focused on aquatic plants systems for wastewater treatment. The objectives of
this project were: A.A survey of existing knowledge about Aquatic
plant system around the world. B. Comparison between Constructed wetland
- emergent plants and Aquatic floating plants system for wastewater treatment. C.
Design considerations of Aquatic plants system for the treatment of wastewater
from the KKL visitor center in Hula valley.
Aquatic plant systems are extensive facilities, simple to operate and therefore low cost alternative for the treatment of municipal, industrial and agricultural effluents. These facilities of wastewater treatment systems consist of shallow ponds or channels, planted with aquatic plants and rely upon natural microbial, biological, physical and chemical processes for the treatment of the wastewater. Aquatic floating plant systems: These systems are shallow ponds with floating or submerged aquatic plants. Because of many problems in Aquatic floating plants system, (mortality of the plants from pest and cold weather, mosquitoes, odor, biomass removal), the utilization of these system was reduced dramatically since 1990 around the world. Constructed Wetlands - emergent plants System: Wetlands are transitional areas between land and water. A constructed wetland is a shallow basin filled with some sort of media: usually soil or gravel and planted with vegetation tolerant of saturated conditions. The two basic types of wetland treatment systems include free water surface flow wetland (FWS) and subsurface horizontal (SSF-H) or vertical (SSF-V) flow wetlands. FWS wetland consists of a shallow basin, soil or other medium to support the roots of vegetation, and water control structure that maintains a shallow depth. SSF consist usually of gravel as a medium for growth of rooted wetland plants. An additional objective of this project was to design an aquatic plant facility for wastewater treatment of KKL visitor center of Hula Project in the newly flooded area in Hula valley. The design of the system was based on a comparison of 3 types of Aquatic system: FWS; SSF-H and Aquatic Floating Plants System. Because of the advantages of SSF-H system concerning the environmental nuisance odors and mosquitoes, the SSF-H system was selected as the design model.