The main goal of this thesis is the assessment of the clogging degree in the horizontal subsurface flow constructed wetland of Martinlongo and Barrada WWTP, included in Algarve Multi-Municipal Sanitation System Despite of constructed wetland treatment processes being natural and constructed wetlands easy to operate, clogging phenomena can be quite complex and challenging in a way that it is nec...

Urbanization results in the conversion of pervious spaces to areas of impervious (paved) surface which creates numerous problems such as erosion, flash floods, pollution of rivers and hot island in city. A sustainable solution to this problem is to use permeable pavements which only began to find application in Australia recently. Permeable pavements can facilitate biodegradation of oils from c...

Clogging of stormwater infiltration systems is an issue of major importance. Actually, it does not only lead to flow rate reduction and increased ponding but it also reduces treatment capacity when infiltration systems are equipped with bypass devices. The aim of this paper is to present the results obtained in this context. The first objective is to understand and characterize clogging evoluti...

The effect of using coarse grain in the upper layer of a gravel-based reed bed is investigated. The aim for testing the “anti-sized” arrangement of gravel media is to seek a solution for the practical problem of medium clogging in reed beds that frequently takes place during the treatment of high strength wastewaters. Results from parallel operations of an anti-sized and a conventional “monosiz...

Aerobic operation of an immersed hollow fibre membrane bioreactor, treating municipal wastewater supplemented with molasses solution, has been studied across mixed liquor suspended solids (MLSS) concentrations between 8 and 32 g L(-1), the higher concentrations being normally associated with thickening operations. Only a marginal loss in membrane permeability was noted between 8 and 18 g L(-1) ...

We report the effects of system geometry on the clogging of granular material flowing out of flat-bottomed hoppers with variable aperture size D and with variable angle θ of tilt of the hopper away from horizontal. In general, larger tilt angles make the system more susceptible to clogging. To quantify this effect for a given θ, we measure the distribution of mass discharged between clogging ev...

Infiltration systems, which are a popular method to manage stormwater, have a history of failure due to clogging within a relatively short period. As yet there is not a single method available to predict the clogging, despite the substantial amount of investments is being made in implementing these systems. Therefore, a detailed laboratory study of stormwater infiltration systems was carried ou...

The purpose of this work is to examine the interplay between hydrodynamic conditions and physicochemical interactions from filtration experiments of microparticles. Experiments are performed in microfluidic filters with real-time visualization at pore scale. Both flow rate and pressure are measured with time to analyze the dynamics of pore clogging and permeability. Flux stepping experiments ar...

Many cryptographic key exchange and management protocols involve computationally expensive operations, such as modular exponentia-tions, and are therefore vulnerable to resource clogging attacks. This paper overviews and discusses the basic principles and the rationale behind an anti-clogging mechanism that was originally designed and proposed to protect the Photuris Session Key Management Prot...