Simplified residence time prediction models for constructed wetland water recycling systems

Abstract

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Multi-variable approach to determine treatment efficiency of wetland: size effect and electro-kinetic effects

“…In this way, the specific volume of water under consideration becomes a dilute solution with increasing concentration of contaminants with time. This is also the case in FCWS wetland discussed by Wei et al [10], but not discussed or thought about. The measurement of pH, electrical conductivity, total dissolved solids, and turbidity will help in ascertaining the extent of contamination or contaminant removal too from these wetlands.…”

“…The efficiency of treatment is dependent on impurity occurrences, time of interaction between the pollutants within a specific volume, and the microbial processes if any [8]. To maximize treatment, it is pertinent to minimize short circuiting [9,10]. The existence of preferential flow paths within the wetland is known as short circuiting [8].…”

“…Wetland reservoir sub-irrigation systems (WRSIS) and farmland channel wetland system (FCWS) are systems which work in tandem with recycling agricultural wastewater; thus, encouraging waste water reuse [11]. Further work through theoretical approach on improving the efficiency of the wetland within the FCWS was performed by Wei et al [10]. In this, the shape of the existing wetland was changes keeping the surface area constant.…”

Comparative analysis of hydrodynamics of treatment wetlands using finite volume models with empirical data

“…In Guilin, China, experimental farmland-channel-wetlandsystems (FCWS) have been developed for small farms which are based on wetland water reuse systems in Midwest USA [10]. Wei et al [10] performed simulations on various two-dimensional shapes of these FCWS wetlands and modelled an approach in which residence time can be written as a function of shape, mass inflow and inlet geometry [10,11].…”

“…Constructed wetlands used for the treatment of produced water from oil wells and shales only cost a minimum of 0.006 $/m 3 [6]. The hydraulic efficiency of wetlands depends upon wetland shape, water height or head, wastewater inflow rate and climatic and soil conditions [2][3][4][5][6][7][8][9][10]. In this paper, only hydraulic conditions are taken into account, and parameters like evapotranspiration, rainfall and infiltration are neglected.…”