Moreno J.,University of Girona |
Comas J.,University of Girona |
Rodriguez-Roda I.,University of Girona |
Rodriguez-Roda I.,Instituto Catalan Of Investigacion Del Agua Icra |
And 6 more authors.
Tecnologia del Agua | Year: 2012
A coupled MBR-RO system has been successfully evaluated in a short term period (40 days) as a potential system to treat urban wastewater for reuse purposes. The RO fouling, probably the major challenge to overcome, provokes a pressure increment, a reduction of permeate flow and a reduction of the solute rejection efficiencies. The foulants have been characterised to optimize the RO filtration process, with the final aim to propose control strategies to mitigate fouling formation (for example, addition of chemicals, etc.).
Teuler A.,Societat General dAigues de Barcelona S.A. |
Vega A.,Societat General dAigues de Barcelona S.A. |
Coma J.,ADIQUIMICA |
Vidal D.,ADIQUIMICA |
Desalination and Water Treatment | Year: 2013
To ensure correct operation of any facility that uses membrane treatment technology (ultrafiltration, reverse osmosis, etc.) requires a set of maintenance and cleaning operations, which allow correct operation and optimum duration of membranes, and also ensure the quality of water produced. In 2009, the existing drinking water treatment plant in Sant Joan Despí started operating a treatment combining ultrafiltration and reverse osmosis technologies to ensure compliance with the health limits set by the Spanish Royal Decree RD140/2003. Specific antiscalant was developed especially for controlling calcium carbonate, calcium phosphate, and barium sulfate scales, which are the most problematic insoluble species in the brine of the reverse osmosis at the water treatment plant in Sant Joan Despí. Specific software was developed to calculate the optimum dose of antiscalant based on the feedwater chemistry, the temperature, and the RO plant's conversion, thus minimizing operating costs. Furthermore, Adiconline RO was installed to measure online and in real time the concentration of antiscalant in the feed. This system analyzes the active ingredients of the antiscalant and allows controlling the dosage level of antiscalant at the required level. The operational data of the RO and the results of autopsy of different elements confirmed that actions taken had been appropriate to provide efficient operation. © 2013 Desalination Publications.
Marian I.,Adiquimica |
Adroer N.,Adiquimica |
Cortada E.,Adiquimica |
Vidal D.,Adiquimica |
Desalination and Water Treatment | Year: 2014
The aim of the study is to evaluate the effectiveness of environmentally friendly antiscalant ADIC RO-18AdicGreen in preventing the formation of scales in the reject, dispersing organic matter and inhibiting the colloidal fouling in the seawater reverse osmosis systems. The antiscalant developed is environmentally friendly because it is phosphorous and nitrogen free. Experimental tests were conducted in order to evaluate the ability of the antiscalant developed to disperse organic and colloidal matter. The results of filtration curves, operated under constant pressure (Modified Fouling Index), and the study using scanning electron microscopy with energy dispersive X-ray spectroscopy of the deposit adhered to filters, indicated that the antiscalant dosage retards filter fouling, and decreases the amount of clay retained on the filter, with respect to a filter without the presence of antiscalant. To evaluate the ability of this antiscalant developed to prevent scale formation in the reject of seawater reverse osmosis, a study in a RO pilot plant was carried out. The tests results demonstrated the antiscalant is effective in controlling inorganic scales and inhibiting the deposition of iron, aluminium, manganese and silica. A dosage of the antiscalant model and the scaling potential reduction for sparingly soluble species model were developed. The models calculate scaling potentials and recommend the minimum dosage of antiscalant to ensure the effective protection of the reverse osmosis membranes against scaling and fouling. Dosing the minimum effective antiscalant reduces operating costs for chemical treatment and minimizes treatment chemical discharge to the environment. © 2014 © 2014 Balaban Desalination Publications. All rights reserved.
Adroer N.,ADIQUIMICA |
Cortada E.,ADIQUIMICA |
Desalination and Water Treatment | Year: 2013
Water desalination plants performance and time evolution of its main operational parameters may be influenced by the presence of certain substances both in solution and in suspension in natural waters. Within these substances, humic acids, which percentage may rise up to 50% of total organic matter, could lead to film formation on membranes surface if removal treatments are not properly implemented. Moreover, contact with disinfectant agents such as chlorine can cause the formation of trihalomethanes (THMs) as undesirable reaction side products. Synthetic coagulant and flocculant dosing programs are included as pre-treatments in water desalination plants as a first stage on water processing in order to remove colloidal matter, from both organic and inorganic sources. However, coagulant and flocculant overdosing not only may be null from the treatment effectiveness point of view but also might lead to recalcitrant fouling phenomena. ADIC GR102, a natural polymer, was used as a flocculant agent in natural organic matter removal processes leading to similar organic matter removal yields and Flocculation Index values to those obtained with currently marketed products. Several assays performed at 80% of coagulant requirement to destabilize the suspension and relatively low dosage of ADIC GR102 opened the doors to a promising future water treatment strategies. © 2013 Desalination Publications. All rights reserved.