Title: Simulations with numerical model PCSiWaPro® for the infiltration system of treated wastewater on Sardin village, Syria

Abdulnaser Aldarir, Peter-Wolfgang Graeber, Ian Desmond Gwiadowski, Rene Blankenburg

Technische Universität Dresden, Germany

Event: GeoKarlsruhe 2021

Date: 2021

DOI: 10.48380/dggv-h5kv-e753

The improvement of groundwater availability in arid areas by infiltration of treated wastewater will play an important role in the next few years. Small wastewater plant is a good alternative in places where central wastewater treatment is not available. Numerical models can be applied to examine the processes more closely and to examine a large number of scenarios analysing.

The study described deals with the numerical modeling of a hypothetical infiltration system at Sarden (Syria) which is supposed to infiltrate treated wastewater into the aquifer. The aim of this work was the evaluation of the infiltration of the treated wastewater and the combination of this with rainwater infiltration from small village, as well as to propose a practicable procedure a possible influence on the groundwater quality can be estimated and evaluated.

PCSiWaPro® (a software for seepage water simulation) was used to create and to simulate their influence on the saturation ratios in the unsaturated zone. In addition, scenarios with different boundary conditions were created and implemented in the model variants.

Results of the simulations carried out indicate that the treated wastewater can infiltrate according to the geofactors at the Sarden site. The distance between the groundwater level and the top of the groundlevel shows a great influence on the saturation conditions of the soil zone under consideration.

A decrease in the substance concentration over depth, according to the degradation parameters used, show the results of the simulation. The concentrations at the measuring points increase with the simulation time.

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