scholarly journals Hexavalent Chromium Removal from Model Water and Car Shock Absorber Factory Effluent by Nanofiltration and Reverse Osmosis Membrane

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Amine Mnif ◽  
Imen Bejaoui ◽  
Meral Mouelhi ◽  
Béchir Hamrouni
Keyword(s):  
Reverse Osmosis ◽  
Hexavalent Chromium ◽  
Shock Absorber ◽  
Industrial Effluent ◽  
Operating Conditions ◽  
Retention Rates ◽  
Water Recovery ◽  
Reverse Osmosis Membrane ◽  
Industry Effluent ◽  
Model Water

Nanofiltration and reverse osmosis are investigated as a possible alternative to the conventional methods of Cr(VI) removal from model water and industrial effluent. The influences of feed concentration, water recovery, pH, and the coexisting anions were studied. The results have shown that retention rates of hexavalent chromium can reach 99.7% using nanofiltration membrane (NF-HL) and vary from 85 to 99.9% using reverse osmosis membrane (RO-SG) depending upon the composition of the solution and operating conditions. This work was also extended to investigate the separation of Cr(VI) from car shock absorber factory effluent. The use of these membranes is very promising for Cr(VI) water treatment and desalting industry effluent. Spiegler-Kedem model was applied to experimental results in the aim to determine phenomenological parameters, the reflection coefficient of the membrane (σ), and the solute permeability coefficient (Ps). The convective and diffusive parts of the mass transfer were quantified with predominance of the diffusive contribution.

Treatment of organized industrial zone wastewater by microfiltration/reverse osmosis membrane process for water recovery: From lab to pilot scale

2020 ◽  
Vol 38 ◽  
pp. 101646
Author(s):  
Bahar Ozbey-Unal ◽  
Philip Isaac Omwene ◽  
Meltem Yagcioglu ◽  
Çigdem Balcik-Canbolat ◽  
Ahmet Karagunduz ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Pilot Scale ◽  
Water Recovery ◽  
Reverse Osmosis Membrane ◽  
Membrane Process ◽  
Industrial Zone

scholarly journals Performance of chemically resistant polyurea reverse osmosis membrane in the treatment of highly alkaline industrial wastewater containing sodium aluminate

2020 ◽  
Vol 82 (11) ◽  
pp. 2259-2270
Author(s):  
Shaik Nazia ◽  
Sugali Chandra Sekhar ◽  
Veeriah Jegatheesan ◽  
Suresh K. Bhargava ◽  
Sundergopal Sridhar
Keyword(s):  
Reverse Osmosis ◽  
Industrial Wastewater ◽  
Interfacial Polymerization ◽  
Industrial Effluent ◽  
Oxygen Demand ◽  
Sodium Aluminate ◽  
Water Recovery ◽  
Cross Sectional ◽  
Feed Composition ◽  
Ro Membrane

Abstract The goal of the present study is to treat industrial wastewater containing sodium aluminate using a chemically inert polyurea (PU) based thin film composite (TFC) reverse osmosis (RO) membrane to promote water reclamation and zero liquid discharge (ZLD). Pretreatment was carried out to reduce the pH of the effluent from 12.5 to 7.1. The TFC RO membrane was fabricated by coating PU on Polyethersulfone (PES) substrate by interfacial polymerization (IP). The surface and cross-sectional morphologies of the membrane were characterized using scanning electron microscopy (SEM). The indigenously synthesized membrane was effective in the removal of total dissolved solids (TDS), chemical oxygen demand (COD), colour and electrical conductivity. The experiments were conducted by varying the feed composition of the wastewater. The maximum water recovery and flux were found to be 74% and 73.9 L/m2·h. RO process using PU membrane exhibited significant potential for cost effective, safe and pollution-free treatment of sodium aluminate industrial effluent.

Performance of low pressure reverse osmosis membrane (LPROM) for separating mono- and divalent ions

1998 ◽  
Vol 38 (4-5) ◽  
pp. 521-528 ◽  
Author(s):  
Zaini Ujang ◽  
G. K. Anderson
Keyword(s):  
Heavy Metals ◽  
Reverse Osmosis ◽  
Metal Removal ◽  
Feed Solution ◽  
Low Pressure ◽  
Operating Conditions ◽  
Operating Pressure ◽  
Reverse Osmosis Membrane ◽  
Permeate Flux ◽  
Feed Concentration

This paper describes an investigation on the rejection of the divalent anions from ZnSO4 using LPROMs, and to establish the effect of operating pressure, feed concentration and temperature on metal removal, then to compare with the monovalent anions, ZnCl2. A bench-scale spiral wound configuration of sulphonated polysulphone low pressure reverse osmosis membrane (LPROM) was used to remove heavy metals at various operating conditions, i.e. operating conditions, solute concentrations and temperature. The results show that the higher the operating pressure the greater will be the permeate flux for heavy metals from both mono- and divalent anions. At low operating pressure however, metals from the divalent anions give a higher permeate flux than did the monovalent anions. Permeate flux in both mono- and divalent anions is shown to be subsequently increased by a decrease of the concentration of feed solution. Regarding metal removal, metals from divalent anions were rejected more effectively than monovalent anions at all levels of feed concentration.

scholarly journals Parametric study to enhance performance of wastewater treatment process, by reverse osmosis-photovoltaic system

2020 ◽  
Vol 10 (10) ◽  
Author(s):  
Yousra Jbari ◽  
Souad Abderafi
Keyword(s):  
Wastewater Treatment ◽  
Energy Consumption ◽  
Reverse Osmosis ◽  
Desirability Function ◽  
Operating Conditions ◽  
Parameters Optimization ◽  
Physical Models ◽  
Photovoltaic System ◽  
Water Recovery ◽  
Battery Capacity

Abstract The presence of certain toxic pollutants in water and wastewater such as chlorophenol must be eliminated, as they have negative effects on human health and the environment. Based on the state of the art, the reverse osmosis (RO) coupled with photovoltaic (PV) was chosen for wastewater treatment. The aim of this article is to evaluate the optimal operating conditions of RO-PV system that maximize chlorophenol rejection with minimal energy consumption. Two complementary approaches were followed combining physical models with statistical ones. The physical model used for the simulation is based on the equations of diffusion and matter balance. After demonstrating the reliability of this model, it was used for parametric sensitivity analysis, performing numerical experiments using a program developed under Python. The data obtained were used for operating parameters optimization, using artificial neural network method coupled with the desirability function. The results showed that the optimal values obtained, relating to feed pressure of 9.713 atm, water recovery rate of 40%, operating flow rate of 10−4 m3/s and temperature of 40 °C could remove 91% of chlorophenol with an energy consumption of 0.8 kWh/m3. This consumption allowed us to deduce that photovoltaic solar panel with a peak power of 280 Wp and a battery capacity of 9.22 kWh is sufficient to produce 1 m3/day.

scholarly journals Impact of operating conditions on performance of capacitive deionisation for reverse osmosis brine recovery

2013 ◽  
Vol 4 (2) ◽  
pp. 59-64 ◽  
Author(s):  
Jing Yu ◽  
Jianjun Qin ◽  
Kiran A. Kekre ◽  
Balakrishnan Viswanath ◽  
Guihe Tao ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Operation Time ◽  
Low Ph ◽  
Operating Conditions ◽  
Water Recovery ◽  
Membrane Area ◽  
Cell Efficiency ◽  
Fouling Control ◽  
Sustainable Operation

The study aimed at further developing an integrated capacitive deionisation (CDI)-based process to treat reverse osmosis (RO) brine from a water reclamation facility to increase the overall water recovery to more than 90% and to achieve a sustainable operation of the process with optimised conditions. The normalised treatment capacity of CDI membranes and voltage was optimised at 24.8 L/m2/h and 1.1–1.5 V, respectively. The operation time of CDI cell with membrane area of 0.8 m2 was able to be extended to more than 1,000 h from the initial 72 h. Cleaning with both HCl at low pH and salt solution was good in removing foulants but cleaning with citric acid was not effective, as expected. The initiative cleaning strategy was found to be more effective in CDI fouling control and is recommended for long-term CDI operation. CDI cell efficiency for removal of ions reduced with operation time due to cleaning with surfactants at pH 10.5 which should be avoided in a future study.

scholarly journals The concentrating of alizarin using a reverse osmosis process

2005 ◽  
Vol 70 (1) ◽  
pp. 107-114 ◽  
Author(s):  
S.S. Madaeni ◽  
H. Daneshvar
Keyword(s):  
Flow Velocity ◽  
Reverse Osmosis ◽  
Cross Flow ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Transmembrane Pressure ◽  
Reverse Osmosis Membrane ◽  
Cross Flow Velocity ◽  
Membrane Technologies ◽  
Madder Root

Membrane technologies in general and reverse osmosis in particular have been employed for the concentrating of solutions. In this study, the concentrating of a heat sensitive alizarin extracted from madder root was realized using an FT30 reverse osmosis membrane. The effects of cross flow velocity, transmembrane pressure and pH on the flux and rejection were studied. Increasing the transmembrane pressure increased the flux while the rejection was constant. At pH 7-8, the highest flux was achieved. This study showed that reverse osmosis is the process of choice for the concentrating of alizarin solutions. The optimum operating conditions were 1.0 m/s cross flow velocity, 16 bars transmembrane pressure and pH 7. The system was tested for 12 h without severe fouling problems.

scholarly journals Temperature Impact on Reverse Osmosis Permeate Flux in the Remediation of Hexavalent Chromium

Water ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 44
Author(s):  
Ihab Shigidi ◽  
Ali E. Anqi ◽  
Abubakar Elkhaleefa ◽  
Azam Mohamed ◽  
Ismat H. Ali ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Hexavalent Chromium ◽  
Applied Pressure ◽  
High Sensitivity ◽  
Operating Conditions ◽  
Operating Pressure ◽  
Permeate Flux ◽  
Membrane Pore ◽  
Flow Rates ◽  
Membrane Pore Size

Reverse osmosis technique was applied in removing hexavalent chromium ions from artificial wastewater. Different operating conditions were studied to monitor the separation process using commercial Reverse Osmosis BW30XFR membrane. Different concentrations of hexavalent chromium; 5, 30, and 100 ppm were tested. Samples were subjected to incrementally increasing operating pressure; 10, 30, and 45 bar and flow rates; 2.2, 3.4, and 4.5 L/min under various temperatures; 25, 35, 45, and 55 °C. Collected permeate and concentrations were measured after each experiment using a UV spectrophotometer. Results obtained presented a higher rejection percentage at lower feed concentrations with a value up to 99.8% for 5 ppm in comparison to 94.3% for 30 ppm and 77.2% for 100 ppm concentration due to concentration polarization; however, it showed no effect of increasing operating flow rates. Moreover, the increase in feed temperature from 25 to 55 °C had positively increased permeate flux to more than 300 times. The permeate flux at 25 °C is recorded for all tested samples in the range of 30 to 158 kg/h·m2, this range has risen at 55 °C under the same conditions to the range of 70 to 226 kg/h·m2, indicating alteration within the membrane pore size due to temperature increase and high applied pressure concluding high sensitivity of polymeric membranes towards changing permeate flow rate with increasing temperatures.

scholarly journals ECOTOXICOLOGICAL EVALUATION THROUGH ALLIUM CEPA OF FOOD INDUSTRY EFFLUENT TREATED BY PROCESS USING MEMBRANES

2018 ◽  
Vol 15 (30) ◽  
pp. 305-312
Author(s):  
L. KERBER ◽  
P. MARIOTTI ◽  
L. VOGNACH ◽  
J. A. TASSINARY ◽  
S. STULP
Keyword(s):  
Reverse Osmosis ◽  
Allium Cepa ◽  
Industrial Effluent ◽  
Toxicological Evaluation ◽  
Technical Application ◽  
Chemical Evaluation ◽  
Treated Effluent ◽  
Resource Degradation ◽  
Ecotoxicological Evaluation ◽  
Industry Effluent

Due to population growth, there is an increase in the tendency of water resource degradation. One of the biggest polluters is the practice of dumping industrial and domestic effluents without any treatment on the watercourse. The utilization of effluents is an alternative to minimize the inadequate waste dump, thus avoiding the overload on the treatment system as well as cutting down costs and expenses. This work’s objective is to evaluate the application of reverse osmosis in a food industrial effluent, in physicochemical and toxicological terms. A reverse osmosis technical application was conducted and then the effluent was examined, before and afterward, in terms of pH, Turbidity, Colouring, Conductivity, Dissolved Oxygen, Total Organic Carbon, and Total Nitrogen as well as a toxicological evaluation (Allium cepa). According to the obtained result, it can be identified that the technique of reverse osmosis showed treatment efficiency when applied to the effluent containing coloring and soy isoflavones, with regards to the physicals and chemical evaluation. In terms of toxicological evaluation, with respect to the radicular development, the treated effluent (permeate) showed a radicular growth, once the raw effluent did not develop any root.

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