Optimization of hybrid coagulation-ultrafiltration process for potable water treatment using response surface methodology

Arhin, Samuel Gyebi; Banadda, Noble; Komakech, Allan John; Pronk, Wouter; Marks, Sara

doi:10.2166/ws.2017.159

Cited by 12 publications

(9 citation statements)

References 21 publications

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“…RSM was applied as a statistical and mathematical method which is used mainly to design experiments, reduce the number of planned experiments and assess the relationship between input and output factors (Apostol et al ., 2011; Jung et al ., 2015; Sarrai et al ., 2016; Tassalit et al ., 2016; Watson et al ., 2016; Arhin et al ., 2018; Djerroud et al ., 2018; Dehghani et al ., 2018; Mohammadi et al ., 2018). A Box‐Behnken Design (BBD) with three independent variables was used to investigate the effect of coagulant dose, slow stirring time and slow stirring velocity on the turbidity removal efficiency and residual metal concentration.…”

Section: Methodsmentioning

confidence: 99%

Assessing desalination pretreatment conditions towards pilot scale‐up using Box‐Behnken experimental design

Hout

Salem

Tassalit

et al. 2020

Water & Environment J

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The purpose of this study is to optimize the operating conditions in batch mode using Box‐Behnken Design (BBD), for the coagulation‐flocculation line sizing prior the sand filter in the pilot scale. Three coagulants were employed to achieve a high turbidity removal with a low concentration of residual metals. The results showed that the best turbidity removal was obtained with FeCl3. Using BBD (15 experiments), the optimal parameters were: coagulant dose = 5.5 mg FeCl3/L, slow stirring time = 33 min and slow stirring velocity = 45 rpm, in these conditions, the turbidity removal reached 94.89% and the residual iron concentration was 0.449 mg/L. Regarding the model fit, the obtained R2 values were 99.67% for turbidity removal and 99.47% for residual iron concentration. The optimum conditions obtained from this study could be scaled up and applied to desalination plants. BBD approach is of great interest because it allows the prediction of the response value without performing experiments.

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Section: Methodsmentioning

confidence: 99%

Assessing desalination pretreatment conditions towards pilot scale‐up using Box‐Behnken experimental design

Hout

Salem

Tassalit

et al. 2020

Water & Environment J

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“…After coagulation (chemical mixing for 1 min, mixing speed of 200 rpm) and flocculation for 5 min, the water was settled for 15 min before being filtered by an ultrafiltration UF membrane unit (PVDF hollow fiber, pore size 0.04 µm, surface area 0.046m 2 /unit). The conditions for coagulation and settling process were referred from previous studies [4,12,24]. The membrane was backwashed every 20 min for the duration of the 30s.…”

Section: Experimental Diagram and Proceduresmentioning

confidence: 99%

“…In many previous studies, the hybrid coagulation-ultrafiltration (UF) membrane processes were often recommended since the main advantages of integrating coagulation with membrane filtration are the enhanced removal of natural organic matter and reduced membrane fouling [12][13][14]. Different coagulants were tried for organic matter control including Al2(SO4)3 [15,16], FeCl 3 [17,18], PAC/PACl [19,20], bio coagulant [11,21] or even drinking water treatment sludge [22].…”

Section: Introductionmentioning

confidence: 99%

Control of Organic Matter From Surface Water in the Coastal Areas Using a Hybrid Coagulation-Membrane System

Dat¹

2022

GEOMATE

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With the impact of climate change, it is impossible for the residents living in coastal areas to employ underground water due to the severe salinity intrusion, they switch to using surface water instead. Nevertheless, the surface water source often has high organic matter, turbidity, and occasionally gets salinity, which results in difficult and costly treatment. This paper evaluated the efficiency of using a hybrid coagulation and ultrafiltration (UF) process in treating surface water in coastal areas of Vietnam. A series of preliminary jar tests were conducted to optimize the pH condition, coagulant dose, and impact of salinity on turbidity and organic matter control. The tests with the hybrid coagulation-UF system were tried after that and fouling evidence was investigated. The jar test results rendered that pH of 6.5, Poly Aluminum Chloride (PAC) with a concentration of 10 mg/L, and pre-chlorination with 10mg/L NaOCl solution were the best conditions for UF pretreatment. Salinity influenced the coagulation process, not the membrane one. The removal efficiencies of turbidity and total organic carbon (TOC) removal were 88% and 66% after coagulation, and 95% and 67% after the hybrid processes, respectively. The presence of trihalomethanes (THMs), specifically, Chloroform, Dibromochloromethane, and Bromodichloromethane were detected in the disinfected water, but much lower than the standard. The THMs formation depended on the contacting time and chlorination doses. The proposed system initially showed some promising results in controlling the pollutants of this river source in the coastal area. Future studies would look at thoroughly the impact of salinity on THMs formation for this kind of water.

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“…RSM is recognized as a mathematical and statistical method for determining optimal operating parameters and analyzing the influence of an independent factor on the response variable (Feng et al 2017;Arhin et al 2018). It already has a wide application in experiment design and process optimization of AD (Song et al 2012).…”

Section: Rsm Parameters and Analysismentioning

confidence: 99%

Influences of Organic Loading, Feed-To-Inoculum Ratio, And Different Pretreatment Strategies On The Methane Production Performance of Eggplant Stalk

Zhu¹,

Zhang²,

Song³

et al. 2021

Preprint

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A large amount of eggplant straw (ES) is incinerated after harvesting of eggplant every year, which aggravates environmental pollution and waste of resources. Converting ES into methane through anaerobic digestion (AD) technology may be a potential treatment method, considering the low environmental impact and high energy recovery. Firstly, this study explored the effects of organic loading (OL) and feed to inoculum ratio (F/I ratio) on the AD of ES by response surface methodology (RSM). In order to achieve higher AD efficiency, various pretreatments (acid, alkali, alkaline hydrogen peroxide (AHP), microwave and ultrasound) were introduced and comprehensively assessed with regard to methane production performance, organic matter destruction and kinetic parameters. Results showed that OL had a more significant impact on AD process compared to F/I ratio and methane production was enhanced remarkably when the OL and F/I ratio were 35.0 g VS/L and 3.0, respectively. XRD, FTIR, and SEM analyses of pretreated ES showed that alkali and AHP pretreatments performed better in delignification. Under optimal conditions, the ES pretreated with 1.5% AHP (adjusted by KOH) performed the maximum methane production of 262.2 mL/g VS with a Bd of 95.0%, which increased by 334.1% than untreated ES. This paper not only provides the theoretical data about methane production performance of ES but also gives practical guidance for efficient utilization of similar vegetable straw biowastes, which is also promising for large-scale industrial applications in the future.

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Optimization of hybrid coagulation-ultrafiltration process for potable water treatment using response surface methodology

Cited by 12 publications

References 21 publications

Assessing desalination pretreatment conditions towards pilot scale‐up using Box‐Behnken experimental design

Assessing desalination pretreatment conditions towards pilot scale‐up using Box‐Behnken experimental design

Control of Organic Matter From Surface Water in the Coastal Areas Using a Hybrid Coagulation-Membrane System

Influences of Organic Loading, Feed-To-Inoculum Ratio, And Different Pretreatment Strategies On The Methane Production Performance of Eggplant Stalk

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