Hydraulic simulation of perforated pipe systems feeding vertical flow constructed wetlands

Abstract

For successfully operating a vertical flow constructed wetland, the uniform distribution of wastewater on the surface of the soil filter is essential. In research, however, this aspect is often overlooked. This study presents a methodology for assessing discharge uniformity from perforated pipe systems via hydraulic modeling. First, the requirements and conditions for the simulation of perforated pipe systems are investigated and the model basics are explained. Then the whole process of model build-up, calibration, application and analysis is presented and discussed. The modeling is done by the software EPANET and supported by pressure measurements in the pipe system of a small wetland treating domestic sewage. A crucial factor in the modeling process is the choice of loss coefficients in dividing junctions. Different approaches for calculating such coefficients are compared. Model calibration is undertaken via the multicriterion optimization algorithm NSGA-II. By calibrating two parameters, a reasonable goodness of fit with the measured pressure values was achieved. Model results show that distribution uniformity of the pipe system in question is poor. An outlook on potential applications of hydraulic modeling of perforated pipe systems in vertical flow constructed wetlands is given.

[Retracted] Application of Computer Simulation Optimization Algorithm in Waste Treatment of Drilling Engineering

“…Drilling waste treatment methods include in situ discharge, in-pit sealing, backfill treatment, curing treatment, biodegradation, MTC conversion, injection into the wellbore annulus or safe strata, and land cultivation [11]. Among them, curing treatment is the most researched and widely used, and the process is [15]. Glass curing technology is based on glass materials as the curing substrate and the use of high-temperature calcination of waste into oxide.…”

Green walls for greywater treatment and reuse in Mediterranean countries

“…The feeding in the LWs takes place through perforated pipes only in the first of the three rows of pots in the modules, the water then passes through t h e rows below to be then collected by drainage channels. The design of the feeding system was one the most challenging aspects in the design of LWs from the hydraulic perspective, since the use of greywater does not allow the use of conventional pressure valves used in common applications of green walls; therefore, the distribution system was sized with hydraulic m o dellin g and the EPANET software was used, following the approach proposed by Paul et al (2018). The porous media was selected according to literature evidence, wit h a mixture of coconut coir, leca, and sand (B oan o et a l., 2020b; Masi et al, 2016).…”