Science APAVITAL SA Iasi

Iaşi, Romania

Science APAVITAL SA Iasi

Iaşi, Romania
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Dascalescu I.G.,Science APAVITAL SA Iasi | Morosanu I.,Technical University Gheorghe Asachi | Ungureanu F.,Technical University Gheorghe Asachi | Musteret C.P.,Technical University Gheorghe Asachi | And 3 more authors.
Environmental Engineering and Management Journal | Year: 2017

Water quality index is an essential tool for water quality assessment. Considering the frequent use of automated water quality monitoring systems, their importance in generating data and information for the efficient management of water treatment plants, the design of such an index would allow the detection of point-pollution episodes, which otherwise would occur undetected and would have a significant impact on the water quality and its further treatment. In this study, a versatile weighted water quality index is presented. The proposed index is validated by using historical data recorded by the on-line monitoring system at the intake from Prut River during the period February - December 2012. The parameters selected for evaluation were: pH, temperature, turbidity, conductivity, dissolved oxygen, nitrates and total organic carbon. The weighted index is compared with the well-known Canadian water quality index. For the period under study, the scores for both indexes resulted in class IV of quality, corresponding to a medium water quality. The sensitivity analysis indicates a higher accuracy of the weighted index model as compared to the Canadian index model. The proposed index may be used as a communication tool for water quality towards the general public and various other water stakeholders, and as an operational control instrument for comparing water quality to diverse uses requirements (drinking water use in this study). © 2017, Gh. Asachi Technical University of Iasi. All rights reserved.

Teodosiu C.,Technical University Gheorghe Asachi | Barjoveanu G.,Technical University Gheorghe Asachi | Sluser B.R.,Technical University Gheorghe Asachi | Popa S.A.E.,Technical University Gheorghe Asachi | Trofin O.,Science APAVITAL SA Iasi
International Journal of Life Cycle Assessment | Year: 2016

Purpose: Wastewater treatment plants produce high environmental impacts on receiving water bodies and pose economic burdens on municipalities or industrial facilities. Their overall operational costs and achieved effluent quality depend very much on the influent type, presence of priority pollutants, treatment technology and required effluent quality (for discharge or for recycle/reuse). Life cycle assessment (LCA), environmental impact quantification (EIQ) and water footprint (WF) are important instruments for sustainability assessments applied for products, production and consumption evaluations in connection with natural resources depletion and pollution threats. This study focuses on the environmental assessment of a municipal wastewater treatment plant (MWWTP) discharges by means of these three evaluation methods with the purpose to understand their (methodological) weak and strong points in capturing the impacts. Such a comparative analysis is necessary to understand how the (individual) advantages provided by each of these instruments can be complimentarily used to improve an assessment framework for various stakeholders concerned with water use cycle management (regional water operators, water management authority, public authorities, research entities, societal organizations, etc.). Methods: The three assessment methodologies (LCA, EIQ, WF) are presented, implemented and critically analysed based on a unitary set of data concerning the MWWTP of Iasi city (a municipality of approx. 300,000 inhabitants situated in the North Eastern region of Romania), the wastewater and river water quality indicators as well as all the other relevant data being collected for the year 2012. Results and discussion: Although the three methodologies have different principles for environmental impact quantification, the results have shown that most impacts induced to surface waters due to Iasi MWWTP effluents are given by the nutrients (nitrogen and phosphorous compounds), which could induce an eutrophication impact, and to a lesser extent by pollutants responsible for toxicity impacts (such as heavy metals). Conclusions: Based on the results of this comparative study, a critical analysis of these three methods was realized by considering the data requirements, their development and integration status. Furthermore, the strong and weak points that are relevant for each method implementation and their subsequent use by decision-makers and Water Authorities are discussed, in the context of legislative requirements (including the Water Framework Directive), actual development of regional water operators and stakeholders' interests. © 2016, Springer-Verlag Berlin Heidelberg.

Cailean D.,Technical University Gheorghe Asachi | Barjoveanu G.,Technical University Gheorghe Asachi | Teodosiu C.,Technical University Gheorghe Asachi | Pintilie L.,Technical University Gheorghe Asachi | And 3 more authors.
Desalination and Water Treatment | Year: 2014

The use of membrane separation like ultrafiltration for reuse of reclaimed water has become an increasingly attractive option, especially nowadays when water quality and water scarcity are stringent issues. In this study, a secondary effluent from Iasi municipal wastewater treatment plant (MWWTP) was treated in a laboratory-scale ultrafiltration equipment with 4 and 6 kDa membranes, in cross-flow operating mode, with complete recirculation of the concentrate, under various pressure conditions (1-2.5 bar) and time periods (1-4 h). Considering the technical performances of the ultrafiltration process, two main directions were followed: firstly, the assessment of membrane productivity in terms of permeate flux, volume reduction factor (VRF), and fouling index (It) and secondly, the evaluation of permeate quality, calculated by the removal efficiencies calculated for various water quality indicators: turbidity, Chemical Oxygen Demand (COD), Total Organic Carbon (TOC), Phenols, Total Nitrogen, Total Phosphorous (TP), Total Fe, Total Cr, Cu2+, Zn2+. The best results obtained on the EM006 membrane, (1 h test, pressure p = 1.5 bar) show removal efficiencies up to 50% in terms of organic compounds removal (COD and TOC indicators), 100% in terms of solids presence (measured by turbidity) and phenolic compounds, up to 30% reduction of TP. The permeate quality was compared with different limits of pollutants concentration, specified in the existing legislative framework for reclaimed water, in United States (US) and Spain (EU). The study indicates that ultrafiltration of the secondary municipal effluent from Iasi MWWTP, in an advanced treatment step, is a feasible option for water reclamation, but special attention is required to the compounds containing nitrogen and especially nitrates concentration which exceed the maximum admissible concentration. © 2014 © 2014 Balaban Desalination Publications. All rights reserved.

Cohl M.,Technical University Gheorghe Asachi | Cohl M.,Science APAVITAL SA Iasi | Lazar L.,Technical University Gheorghe Asachi | Balasanian I.,Technical University Gheorghe Asachi
Environmental Engineering and Management Journal | Year: 2014

Evaluation of the quality of natural waters used as sources for drinking water supply is very important for selection of the proper technological treatment system that would ensure the compliance of physical, chemical and microbiological parameters with the specific standards. The current study aims at investigating the quality of two natural waters used as sources for drinking water supply of Iasi City: Prut River (surface water) and Timisesti (groundwater). The experimental analysis of the water quality was performed by daily sampling and analysis of four of the main quality indicators that are critical for disinfection: temperature, pH value, turbidity and oxidability for both sources. Evaluation of monthly, seasonal and yearly averages and variations also has been accomplished. Based on the results of this study conducted for a period of almost five years (January 2009 – November 2013) it was found that the main quality indicators for the two natural water sources comply with the Romanian technical norm. The comparison of the average values of the analyzed parameters for the period 2009 – 2013 reveals a better quality of the Timisesti source that would require only a simple physical treatment followed by chlorination. Prut River water source, however, requires a physical and chemical treatment followed by disinfection through chlorination before being distributed to the water supply network of Iasi City. © 2014, (publisher). All rights reserved.

Cohl M.,Science APAVITAL SA Iasi | Lazar L.,Technical University Gheorghe Asachi | Cretescu I.,Technical University Gheorghe Asachi | Balasanian I.,Technical University Gheorghe Asachi
Revista de Chimie | Year: 2015

Water disinfection, using oxidants bases-chlorine in order to diminish or to eliminate in totality the microbial charge in drinking water, presents the disadvantage of the formation of trihalomethanes (THMs), which are toxic and carcinogens compounds. The studies of THMs in water during the disinfection process and the possibilities for diminishing their content in drinking water were carried out in the municipal water treatment plant of Iasi, using gaseous chlorine and chlorine dioxide, respectively. Comparative analysis of the obtained results after the water disinfection by chlorination using the above mentioned disinfection agents, indicated that chlorine dioxide leads to lower concentrations of trihalomethanes and provides better quality drinking water in terms of the main water quality indicators. These results, based on seven years (2006-2013) of monitoring for THMs and for the main water quality indicators, recommended the use of chlorine dioxide for water disinfection, when the water is provided from the surface source, such as the Prut River.

Dascalescu I.G.,Science APAVITAL SA Iasi | Cohl M.,Science APAVITAL SA Iasi | Teodosiu C.,Technical University Gheorghe Asachi
Environmental Engineering and Management Journal | Year: 2011

Drinking water produced in water treatment plants almost invariably fulfils the water quality requirements set, for example by the European Union Drinking Water Directive 98/83/EC (EU DWD) and national legislation. However, EU DWD requires that water quality should also meet the requirements at the consumers' tap. The quality of drinking water changes due to the transportation through the distribution networks and the time spent in the reservoirs until the last point of consumption. Water companies face major problems related to the quality of the drinking water at consumers' tap, even if they invest important financial resources for catchments, treatment and disinfection. Aesthetic and organoleptic problems are the main reasons for customers to complain about the water quality supplied. Turbidity is one of the quality indicators causing most of the water quality problems. Nowadays, modern water management must tackle in an integrated way the law requirements and the new technologies and instruments which help water companies identify the cause of any events occurring in the supply networks, in terms of real-time monitoring. These problems are also valid for Iasi County, situated in the North-Eastern part of Romania, where water supply and wastewater treatment are managed by SC Apavital SA, a county-wide public-owned company which has the task of providing high-quality water and related services for customers, while complying with strict regulations. This study presents the application of an on-line monitoring system for real-time, continuous monitoring of turbidity in the Iasi city distribution network, as well as the efficiency of on-line turbidimeters for water quality monitoring in the effluent of the treatment plant and for water quality changes in the distribution system. By evaluating the data gathered during the on-line monitoring of turbidity for this case study, it is possible to detect abrupt changes in water quality and thus to react to any disturbances in the system by adequate corrections in the treatment stages.

Lacatusu R.,National Research and Development Institute for Soil Science | Lacatusu R.,Al. I. Cuza University | Lacatusu A.-R.,National Research and Development Institute for Soil Science | Stanciuburileanu M.M.,National Research and Development Institute for Soil Science | And 4 more authors.
Carpathian Journal of Earth and Environmental Sciences | Year: 2012

It is presented the possibility to reduce contents of heavy metals (cadmium, zinc) in a sludge proceeded from the wastewater treatment plant of Iaşi Municipality. The sludge was deposited, for over 10 years, in a mud pond with a surface about 15 ha, placed on a calcareous and salinised alluvial soil. For this purpose, it is proposed using the spontaneous flora, which has been settled in a period of four years after closure of the deposit. The flora has been predominantly composed of Phragmytes australis, and also other species such as Rumex acetosela, Chenopodium album, Aster panonicum, Solanum nigrum and others. These plants accumulated in their roots and in the aerial part cadmium (Cd) quantities, which exceed up to 60, respectively 14 times the normal values. Similarly, zinc (Zn) has been concentrated in the roots and aerial parts 33 times, 18 times respectively. The transfer (TF) and bioaccumulation (BAF) factors' values highlight the plants' feature to accumulate heavy metals from the sludge. The plants can be arranged in a decreasing series of the accumulated heavy metals (cadmium, copper, lead, zinc), thus Rumex acetosela, Solanum nigrum, Chenopodium album, Aster panonicum and Phragmytes australis. Applying phytoextraction of polluting heavy metals only by annual harvesting of aerial part of the spontaneous flora now existing, will bring the sewage sludge to a normal content level of these heavy metals in a period of up to 450 years. If the harvest will include also the roots, the time necessary to decontaminate the sludge could be reduced with 50-60 %. In addition, the change of floristic composition so that Rumex and Solanum genus are becoming dominant, could lead to a significant reducing of phytoremediation period.

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