Wastewater treatment-POSTER SESSION

[CEST2019_00870] Removal of heavy metals from sewage sludge using combined hydrothermal pretreatment and chelate extraction
by Usťak S., Muňoz J.

The removal of heavy metals from sewage sludge using the combined influence of hydrothermal pretreatment and chelate extraction was tested. The classical method of batch extraction with chelates and the advanced hydrothermal pretreatment (HTP) extraction process with chelates were compared. Both experiments with removal of selected HMs were performed with 0.1 M solutions of 5 different chelating agents: citric acid (CA), S-carboxymethyl-L-cysteine (SCLC), ethylenediamine disuccinic acid (EDDS), methylglycine diacetic acid (MGDA) and ethylenediaminetetraacetic acid (EDTA). The sequential order of potential extraction efficiency at chelates was found as EDDS > EDTA > MGDA >>> SCLC > KC. The mixture of sewage sludge with high sand content soil (A) had in all cases the higher removal efficiency in comparison to the sewage sludge mixture with clay soil (B). The removal of the tested HMs from mixture A and B was better than from the sewage sludge alone. HTP extraction method showed better removal efficiency and significantly shorter time of the process. Also, this extraction method had the higher potential of efficiency in the mixture of soils and sewage sludge. More detailed research on this topic is desirable.

Friday
Poster presentation in Wastewater treatment-POSTER SESSION
[CEST2019_00951] The importance of water for life on the planet: Education for Global Citizenship
by Tzaberis N.

The water shortage observed is due to the fact that the environment has undergone significant interventions that led to a qualitative degradation of water resources, overexploitation, pollution, the dropping of water level, salivation of aquifers, etc. The prevailing situation seems to be perpetuated possibly due to the interests involved, attitudes, perceptions, and lack of awareness of the seriousness of the problem. In order to solve the problem through Education for Sustainable Development, this paper is an exploratory tool of a broader research aiming to record the knowledge and views of the sample in order to develop the appropriate educational programme on issues related to the environment, water pollution, tackling water pollution, water scarcity and wastewater recovery systems. The results of the survey show that students have poor knowledge of water scarcity, water pollution, and how to deal with them, as well as the role of wastewater treatment in integrated water management.

Friday
Poster presentation in Wastewater treatment-POSTER SESSION
[CEST2019_00468] Optimization of decentralized treatment and sanitation of domestic wastewaters via constructed wetlands: The DOMUS_CW project
by Ntaikou I., Antonopoulou G., Drakopoulos V., Dailianis S., Lyberatos G.

Two free surface flow CWs constructed in one Greek and one Cypriot community, were upgraded in order to serve as case studies to be further optimized via modeling. Through the systematic and detailed monitoring of the two CWs their operational efficiency was evaluated, and the response to operational factors that have not been extensively studied yet, such as supply variations and recirculation, were recorded and incorporated into the model. In addition, the effect and fate of xenobiotics, the interactions among plants and microorganisms, the toxic potency of effluents an the cropping frequency were evaluated aiming to the better understanding and thus further improvement of the operation of the systems. An exploitation plan for CW effluents and plant biomass is also proposed investigated, aiming at the recovery of water and nutrients, contributing thus to the European goals for Sustainable Development. The main outcome of the project is the creation of a generic assessment tool, a model platform via which the feasibility of CW technology application in different sites could be evaluated based on minimal initial data.

Thursday
Poster presentation in Wastewater treatment-POSTER SESSION
[CEST2019_00475] Wastewater disinfection applying solar energy
by Zkeri E., Vourdoubas I., Katsivela E.

Solar Water Disinfection Process (SODIS) is a simple technology using solar UV-A radiation (wavelength 320-400 nm) and elevated water temperature to inactivate pathogens. In the present survey, the effect of solar radiation on the disinfection of domestic secondary treated wastewater from the Wastewater Treatment Plant (WWTP) of the Municipality of Chania (Crete, Greece) was investigated during the day hours in summer. The used secondary treated wastewater samples had initial turbidity of 6 ΝΤU, BOD5 of 23 mgO2/L, and concentration of 4.6 × 104 and 2.6 × 104 CFU/100ml for the total heterotrophic bacteria cultivated at 37οC and at 22οC respectively, 5.5 × 105 CFU/100ml for the total coliforms, 1.5 × 105 CFU/100ml for the fecal coliforms, and 2 × 104 CFU/100ml for the fecal Enterococcus. The experiments were carried out in transparent Polyethylene Terephthalate plastic bottles during the months July, August and September. An average reduction of 97-99% of the concentration of the total heterotrophic bacteria, and of 99.5-99.9% of the total and fecal coliforms, as well as of the fecal Enterococcus was obtained after 6 hours of exposition in solar radiation with intensity ranging from 500 to 1,280 W/m2 and temperature from 33οC to 49οC in the wastewater.

Thursday
Poster presentation in Wastewater treatment-POSTER SESSION
[CEST2019_00981] Modeling and optimization of two-phase olive-oil washing wastewater phenolic compounds recovery and treatment by novel weak-base ion exchange resins
by Ochando-Pulido Javier M., Rubén González-H., Martínez-Férez A.

In the present work, the concentration and recovery of high-added value phenolic compounds from two-phase olive mill wastewater (OMW) and the simultaneous effluent treatment by a ‘green process’ based on resins adsorption/ion exchange was studied. Olive oil is produced by a technological procedure based on physical operations, without use of chemicals. This industry is concerned to make the whole process environmentally friendly, which includes the treatment of the wastewater produced in the mills. The proposed weak-based IE process was statistically optimized and modelled. Results showed the resin performance was optimal at the raw effluent pH and ambient temperature conditions, which means no acidification or basification, nor cooling or heating would be needed. This would imply important savings for the scale-up of the process in real mills. The examined resin ensured minimum 72.4% phenols adsorption after 2 h contact time. The effluent could be partially discharged on suitable terrains or disposed to biological treatments, avoiding phytotoxicity or inhibition due to the phenolic content. The obtention of this concentrated pool of added-value antioxidant compounds for food, cosmetics, pharmaceutical and biotechnological industrial sectors could help counter-balance the economic feasibility of the reclamation process.

Thursday
Poster presentation in Wastewater treatment-POSTER SESSION