Session 43 - Water treatment

[CEST2019_00952] “LafargeHolcim's Greece (Heracles Group) journey to a Water Secure Future
by Rosario-Chan M., Koumenides C.

Water is considered a precious resource globally. It is not only a source of life, but is also essential in most manufacturing processes. The demand for water is growing and the competition for its use is intensifying. Water will require more management attention in the future as it is already considered a sustainability challenge. Although the construction material industry is not a large consumer of water compared to other industries, water is an essential resource in cement operations.

Session: 43, Room: A, at Sat, 09/07/2019 - 11:45 to 12:00
Oral presentation in Water treatment
[CEST2019_00963] Adsorption isotherm study of copper removal from aqueous solutions onto agricultural by-product.
by Kapsalaki K., Psychogiou M., Mitrogiannis D., Sgoubopoulou A.

Pollution by heavy metals is a serious global problem, both for the environment and for any form of life. There is a growing interest to find low cost agricultural by-products with high adsorption capacity for the removal of heavy metals. In the present study the adsorptive capacity of chemically modified rice husk was evaluated for the removal of copper ions from aqueous solutions. Equilibrium isothermal experiments were conducted and five mathematical models were used to investigate the adsorption isotherm.

Session: 43, Room: A, at Sat, 09/07/2019 - 12:00 to 12:15
Oral presentation in Water treatment
[CEST2019_00908] Bio-Based phosphate functionalized activated carbon from Indian gooseberry seed shells for the efficient Copper(II) adsorption
by Mondal S., Majumder S.

Preparation of an efficient activated carbon for the removal of metal pollutants is a challenging research today. The characteristic features of an efficient phosphate functionalized activated carbon, synthesized by following chemical activation process followed by subsequent functionalization from Indian gooseberry seed shells for the copper (II) adsorption are reported. Indian gooseberry seed shells based activated carbon showed the BET surface area of 1359 m2/g, the adsorption capacity of 44.84 mg/g at 30 °C and at a pH value of 9.52.

Session: 43, Room: A, at Sat, 09/07/2019 - 12:51 to 12:54
Flash presentation in Water treatment
[CEST2019_00840] Microbiological treatment of water by cold plasma at atmospheric pressure
by Cubas A.L.V., Machado M.M., Santos J.R., Moecke E.H.S

Ensuring the world's population access to drinking water is one of the millennium's challenges, for although our planet is made up of 70% of water, poor distribution and water quality are problems that concern world leaders, being among the objectives of development 2030 agenda set by the ONU. The proposed work aimed at the microbiological treatment of water through cold plasma technology at atmospheric pressure, the control to confirm the efficiency of the treatment was through the analysis of thermotolerant coliforms.

Session: 43, Room: A, at Sat, 09/07/2019 - 12:48 to 12:51
Flash presentation in Water treatment
[CEST2019_00809] Reduction of Halogenated Organic Compounds in Water: Comparison of Available Reduction Systems based on Cu, Pd and ZVI
by Shee A., Kopinke F.-D., Mackenzie K.

Catalysts on the basis of copper (Cu) and the reducing agent borohydride (BH4-) have been successfully used for reduction of chlorinated aliphatics with low substitution degree which are usually resistant to zero-valent iron (ZVI) and hydrodehalogenation catalysts, such as Pd. Reactivity screening towards a broad spectrum of halogenated organic compounds (HOCs) helped to reveal the possible application areas of the Cu/BH4- system in water treatment compared to Pd and ZVI.

Session: 43, Room: A, at Sat, 09/07/2019 - 11:30 to 11:45
Oral presentation in Water treatment
[CEST2019_00751] Improving mycoremediation of acetaminophen: Effect of pH, nitrogen limitation, and co-cultivation
by Esterhuizen-Londt M., Behnam Sani S., Wang L.,Pflugmacher S.

Untreated pharmaceutical pollution and their possibly more toxic metabolites, resulting from outdated traditional wastewater treatment processes, end up in aquatic environments and are hazards to the ecosystem homeostasis. Biological wastewater remediation could supplement traditional methods and overcome the dumping of these biologically active compounds in the environment. Mycoremediation is especially promising due to the unspecific nature of fungi to decompose compounds through exoenzymes and the uptake of compounds as nutrients.

Session: 43, Room: A, at Sat, 09/07/2019 - 11:15 to 11:30
Oral presentation in Water treatment
[CEST2019_00771] Mixed Nanostructures / PES / RO Membrane for Water Desalination
by Shalaby M.S., Abdallah H., Shaban A.M., Chetty R., Kumar M.

Different nanomaterials graphene, zinc nanorode and zinc nanosephere were used in membrane preparation. Polyethersulphone as a main polymer was blended with nano-soultions of these nanomaterials. This Support layer was coated by a composite coating layer formed of polyvinylacohol and titanium dioxide nanotubes to provide strength and enhance hydrophilicity of such membranes. M2 (using graphene) provides highest permeate flux 30.6 L/m2.h due to its highest hydrophilicity, but it was lowest salt rejection 48.9% at feed concentration of 5000 ppm.

Session: 43, Room: A, at Sat, 09/07/2019 - 12:30 to 12:45
Oral presentation in Water treatment
[CEST2019_00660] Highly efficient anti-fouling electro-conductive membranes fabricated by reduced Graphene Oxide-Polyaniline (rGO-PANI) laminates
by Kaekooti A., Rastgar M., Sadrzadeh M.

As an obstacle against the widespread application of membranes in larger scales, fouling via different materials could cause a severe decline in water permeation. Herein, we fabricated a novel mechanically-stable electro-conductive membrane by simple pressure-assisted laminating of reduced Graphene Oxide-Polyaniline (rGO-PANI) suspension on the commercial polyethersulfone (PES) support layers. Field emission scanning electron microscopy (FESEM) and water contact angle measurements were used to characterize rGO-PANI membranes.

Session: 43, Room: A, at Sat, 09/07/2019 - 11:00 to 11:15
Oral presentation in Water treatment
[CEST2019_00663] Thermodynamic model for a reversible desalination cycle using polyelectrolyte hydrogels
by Rud O., Košovan P.

We propose a novel desalination scheme which employs the hydrogels as a tool to draw salt ions from a brine with low salinity to a brine with high salinity. As a driving force we use the fact that the volume of polyelectrolyte gel does depend on the surrounding salinity. While the salinity defines the gel volume in open system, i.e. in equilibrium with big aqueous solution bath, in closed system (in equilibrium with small bath) salinity is defined by the gel volume.

Session: 43, Room: A, at Sat, 09/07/2019 - 12:15 to 12:30
Oral presentation in Water treatment
[CEST2019_00601] Radiation-induced degradation products of 2-methyl isoborneol and geosmin: the role of different reactive species
by Christophoridis C., Pestana C.J., Kaloudis T., Lawton L., Hiskia A.

Gamma radiolysis can serve as an effective method for the degradation of organic water pollutants, due to the production of reactive species, oxidative (OH•, OOH•, O2•-) or reductive (eaq-, H•). The application of scavengers enables the selective production of these species. Our aim was to explore the effects of the radiolytically produced reactive species, on commonly occuring water taste and odour compounds (T&O), 2-methyl isoborneol (MIB) and geosmin (GSM).

Session: 43, Room: A, at Sat, 09/07/2019 - 12:45 to 12:48
Flash presentation in Water treatment