Water treatment-POSTER SESSION

[CEST2019_00835] Phase Diagram Modeling of a Multicomponent Aqueous Solution of Katwe Salt Lake, Uganda
by Lwanyaga J.D., Kasedde H., Kirabira J.B.

A methodology is developed to compute the phase diagram of a hexary system and to determine the mineral precipitation sequence upon removal of water. The methodology is applied to construct the phase diagram and precipitation sequence of the system (〖Na〗^+,K^+)(〖Cl〗^-,〖SO〗_4^(2-),〖CO〗_3^(2-) & 〖HCO〗_3^-) in water. The thermodynamic model chosen is the Extended UNIQUAC. A 3D grid is constructed in order to solve this model in MATLAB. On the basis of this grid, a 3D phase diagram is calculated and a Jänecke projection is obtained. The precipitation sequence due to evaporation is calculated thus obtaining the coordinates of the solution along this path as well as the order of precipitation. The numerical model is also able to calculate all these steps for temperatures 0-110°C. In addition, the number of ions and the composition of the system can be varied in order to model other elective systems. The obtained results are well suited to be used for the design of sustainable salt extraction processes for both Sea and Lake brines.

Saturday
Poster presentation in Water treatment-POSTER SESSION
[CEST2019_00286] 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. The reduction was 93.33% for thermotolerant coliforms and cold plasma technology reduces the time of microbiological treatment of water by 90% over traditional methods due to high energy density, ozone generation and ultraviolet radiation, thus reducing costs because the energy expenditure was low and there is no need to add chemicals.

Saturday
Poster presentation in Water treatment-POSTER SESSION
[CEST2019_00706] Arsenic Removal Using Electrocoagulation Process
by Vaiyakone P.,Soriano R., Morales-Corpuz M.V.A., De Sales L.

Contamination of water resources with Arsenic poses serious health concerns because of its toxic and carcinogenic nature. Detection of Arsenic at concentrations higher than 10 parts per billion (ppb) in some Philippine water resources confirmed the need for further studies on the contamination and for the investigation of potential treatment technologies.
This study examined the removal of Arsenic from synthetic contaminated water, with initial concentrations of 100 ppb and 300 ppb, using electrocoagulation process. The electrocoagulation batch reactor utilised combined iron and aluminum electrodes, in parallel configuration. Employing a Box-Behnken experiment design for response surface modeling (RSM), three factors were investigated with each factor varied at three levels – pH of the wastewater solution current density and reaction time.
Results showed that at optimum parameters of pH 7, 25 A/m2 current density and 40 minutes reaction time, the electro coagulation reactor is able to reduce the 100 ppb Arsenic in water by 99.20%. At optimum parameters of pH 7, 20 A/m2 current density, and 40 minutes reaction time, the reactor is cable to reduce 300 ppb Arsenic in water by 98.23%.

Saturday
Poster presentation in Water treatment-POSTER SESSION
[CEST2019_00773] Feasibility of reuse filter backwash water as primary/aid coagulant in coagulation-sedimentation process for synthetic effluent
by Mazari L., Abdessemed D.

The purpose of this study is to evaluate the feasibility of reusing filter backwash water (FBWW) from the water treatment plant (WTP)as a substitute for the conventional coagulants (primary coagulant) in the coagulation-sedimentation process applied for synthetic effluent.The coagulation effect on the elimination of the turbidity and UV254 was investigated by treating synthetic effluent using FBWW as a substitute for conventional coagulants.

Saturday
Poster presentation in Water treatment-POSTER SESSION
[CEST2019_00852] Biosorption of Mn(II) ions from water solutions by natural sorbent: equilibrium study
by Mustafa E., Aliu F., Atkovska K., Kuvendziev S., Dimitrovski D., Bozhinovski Z., Marinkovski M., Lisichkov K.

In the modern society, the problem of the treatment of natural and wastewater resources and their management, is becoming very important.
Of particular interest is the definition of adequate and sophisticated procedures for the treatment of natural and wastewater resources, regardless of whether the source of pollution is of geogenic or anthropogenic origin.
Sustainable development of separation processes has recently been increasingly imposed by the need to develop modern, non-conventional bioseparation processes for the elimination of toxic metals from wastewater, by applying low cost unconventional sorbents.
The purpose of this paper is to remove Mn (II) ions from aqueous solutions by applying a natural adsorbent (grape branches - agricultural waste). To accomplish the established goal, the experiments were carried out with model solutions with known initial concentrations of Mn(II) ions in a laboratory batch reactor, with the purpose of studying the effect of adsorption time on adsorbate concentration and on the adsorbed amount of Mn(II) ions.
The raw material was characterized in terms of its chemical composition and particle size distribution.
The obtained results were applied to model the adsorption equilibrium using several adsorption isotherms such as Langmuir, Freundlich, Langmuir-Freundlich and Redlich-Peterson, using the MATLAB/Curve fitting toolbox software package.

Saturday
Poster presentation in Water treatment-POSTER SESSION
[CEST2019_00270] Water resources management in education for sustainable development
by Tzaberis N., Paraskeva D., Tatarakis N.

Issues relating to water resources are included among the most serious environmental problems. Pollution and deterioration of the receiving surface water and groundwater, mainly from human activities, pose an immediate threat to natural ecosystems and the functions of biosphere reserves, the balance of which is a prerequisite for the survival of every life form on the planet. In this light, the aim of the current study is to record second grade high school Rhodes students’ knowledge of matters concerning water. For the purposes of the investigation, a questionnaire was used consisting of 19 main questions, which was distributed to 292 students. The survey results indicate a general lack of adequate knowledge in matters relating to pollution and water scarcity, as well as ways of dealing with them, and managing water resources. These data require the development of appropriate teaching interventions in education for sustainable development. This teaching procedure can contribute to the formation of active citizens, with knowledge, sensitivity and willingness to defend the right to life by preserving and maintaining healthy aquatic systems for the present and the future of humanity.

Saturday
Poster presentation in Water treatment-POSTER SESSION
[CEST2019_00257] Successful use of UV light driven photocatalytic oxidation for the removal of an emergent water contaminant
by Sescu A.M., Favier L., Lutic D., Ciobanu G., Harja M.

The degradation of a new anti-epileptic drug, named levetiracetam in aqueous solution has been investigated by heterogeneous photocatalysis, under UV light irradiation. For the photocatalytic assays, the photocatalytic activity of two different commercial catalysts (TiO2 Aeroxide® P25 and TiO2 Kronos uvlp 7500) was compared. The influence of some operating conditions (catalyst dosage, UV light irradiation, initial pollutant concentration, pH and water matrix was studied) and the main kinetic parameters were determined. For optimal degradation conditions an elimination yield of 99% was achieved. Kinetic studies have shown that the degradation of target molecule can be described by the Langmuir-Hinshelwood model. Toxicity tests were also carried out to evaluate the potential of detoxification of the considered oxidation process.

Saturday
Poster presentation in Water treatment-POSTER SESSION