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Girish N, Parashar N, Hait S. Coagulative removal of microplastics from aqueous matrices: Recent progresses and future perspectives. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 899:165723. [PMID: 37482362 DOI: 10.1016/j.scitotenv.2023.165723] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 07/06/2023] [Accepted: 07/20/2023] [Indexed: 07/25/2023]
Abstract
Coagulation-flocculation-sedimentation (CFS) system has been identified as one of the favored treatment technique in water/wastewater treatment systems and hence, it is crucial to comprehend the efficacy of different coagulants used in removing microplastics (MPs) from aqueous matrices. Henceforth, this study critically reviews the recent progress and efficacy of different coagulants used to date for MPs removal. This includes laboratory and field-scale studies on inorganic and organic coagulants, as well as laboratory-scale studies on natural coagulants. Inorganic and organic coagulants have varying MPs removal efficiencies such as: Fe/Al-salts (30 %-95 %), alum (99 %), and poly aluminum chloride (13 %-97 %), magnesium hydroxide (84 %), polyamine (99 %), organosilanes (>95 %), and polyacrylamide (85 %-98 %). Moreover, studies have highlighted the use of natural coagulants, such as chitosan, protein amyloid fibrils, and starch has shown promising results in MPs removal with sevral advantages over traditional coagulants. These natural coagulants have demonstrated high MPs removal efficiencies with chitosan-tannic acid (95 %), protein amyloid fibrils (98 %), and starch (>90 %). Moreover, the MPs removal efficiencies of natural coagulants are compared and their predominant removal mechanisms are determined. Plant-based natural coagulants can potentially remove MPs through mechanisms such as polymer bridging and charge neutralization. Further, a systematic analysis on the effect of operational parameters highlights that the pH affects particle surface charge and coagulation efficiency, while mixing speed affects particle aggregation and sedimentation. Also, the optimal mixing speed for effective MPs removal depends on coagulant type and concentration, water composition, and MPs characteristics. Moreover, this work highlights the advantages and limitations of using different coagulants for MPs removal and discusses the challenges and future prospects in scaling up these laboratory studies for real-time applications.
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Affiliation(s)
- Nandika Girish
- Department of Civil and Environmental Engineering, Indian Institute of Technology Patna, Bihar 801 106, India
| | - Neha Parashar
- Department of Civil and Environmental Engineering, Indian Institute of Technology Patna, Bihar 801 106, India
| | - Subrata Hait
- Department of Civil and Environmental Engineering, Indian Institute of Technology Patna, Bihar 801 106, India.
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2
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Mohamed Hatta NS, Lau SW, Chua HB, Takeo M, Sen TK, Mubarak NM, Khalid M, Zairin DA. Parametric and kinetic studies of activated sludge dewatering by cationic chitosan-like bioflocculant BF01314 produced from Citrobacter youngae. ENVIRONMENTAL RESEARCH 2023; 224:115527. [PMID: 36822539 DOI: 10.1016/j.envres.2023.115527] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Accepted: 02/18/2023] [Indexed: 06/18/2023]
Abstract
Bacterial strains belonging to Citrobacter spp. were reported to produce polysaccharides consisting of N-acetylglucosamine and glucosamine like chitosan, with high flocculation activity. In this work, the flocculation dewatering performance of activated sludge conditioned by a novel cationic chitosan-like bioflocculant (BF) named BF01314, produced from Citrobacter youngae GTC 01314, was evaluated under the influences of flocculant dosage, pH, and temperature. At BF dosage as low as 0.5 kg/t DS, the sludge dewaterability was significantly enhanced in comparison to the raw (untreated) sludge, featuring well-flocculated characteristic (reduction in CST from 22.0 s to 9.4 s) and good sludge filterability with reduced resistance (reduction in SRF by one order from 7.42 × 1011 to 9.59 × 1010 m/kg) and increased compactness of sludge (increase in CSC from 15.2 to 23.2%). Besides, the BF demonstrated comparable high sludge dewatering performance within the pH range between 2 and 8, and temperature range between 25 °C and 80 °C. Comparison between the BF, the pristine chitosan and the commercial cationic copolymer MF 7861 demonstrated equivalent performance with enhanced dewaterability at the dosage between 2.0 and 3.0 kg/t DS. Besides, the BF demonstrated strong flocculation activity (>99%) when added to the sludge suspension using moderate to high flocculation speeds (100-200 rpm) with at least 3-min mixing time. The BF's reaction in sludge flocculation was best fitted with a pseudo first-order kinetic model. Electrostatic charge patching and polymer bridging mechanisms are believed to be the dominant mechanistic phenomena during the BF's sludge conditioning process (coagulation-flocculation).
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Affiliation(s)
- Nur Syahirah Mohamed Hatta
- Department of Chemical and Energy Engineering, Curtin University Malaysia, CDT 250, 98009 Miri, Sarawak, Malaysia
| | - Shiew Wei Lau
- Department of Chemical and Energy Engineering, Curtin University Malaysia, CDT 250, 98009 Miri, Sarawak, Malaysia.
| | - Han Bing Chua
- Department of Chemical and Energy Engineering, Curtin University Malaysia, CDT 250, 98009 Miri, Sarawak, Malaysia
| | - Masahiro Takeo
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan
| | - Tushar Kanti Sen
- Chemical Engineering Department, King Faisal University, Hofuf, Al-Ahsa 31982, Saudi Arabia
| | - Nabisab Mujawar Mubarak
- Petroleum and Chemical Engineering, Faculty of Engineering, Universiti Teknologi Brunei, Bandar Seri Begawan BE1410, Brunei Darussalam.
| | - Mohammad Khalid
- Graphene and Advanced 2D Materials Research Group (GAMRG), School of Engineering and Technology, Sunway University, No. 5, Jalan Universiti, Bandar Sunway, 47500 Subang Jaya, Selangor, Malaysia; Uttaranchal University, Dehradun, 248007 Uttarakhand, India
| | - Danial Aminin Zairin
- Graphene and Advanced 2D Materials Research Group (GAMRG), School of Engineering and Technology, Sunway University, No. 5, Jalan Universiti, Bandar Sunway, 47500 Subang Jaya, Selangor, Malaysia
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Bagastyo AY, Anggrainy AD, Gatneh S, Nurhayati E, Susanti D, Widodo E, Soehartanto T, Warmadewanthi I. Study on optimization of coagulation-flocculation of fish market wastewater using bittern coagulant - response surface methodological approach. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2022; 85:3072-3087. [PMID: 35638806 DOI: 10.2166/wst.2022.136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Bittern contains a high ionic strength that can be used as an alternative coagulant in wastewater treatment. The magnesium content in the bittern could promote the removal of suspended particles and nutrients as settleable precipitates. This would create a more compact and manageable sludge. This study investigates the performance of bittern as a coagulant for fish market wastewater treatment. The effectiveness of bittern was evaluated based on the efficiency of pollutants removal and the amount of residual magnesium. The experiments were performed using a standard jar test. Response surface methodology (RSM) based on a two-factor central composite design (CCD) was used to design the experiment. The parameters involved were pH (7.5, 9, and 10.5) and coagulant dose (0.5, 1.5, 2.5 mL L-1). The maximum removal efficiencies (i.e., 93.3% TSS, 87.5% COD, 37.6% ammonium, and 91.3% phosphate) were recorded at pH 10.5 and 1.5 mL L-1 dose of bittern, while the optimum results (desirability value of 0.929) may occur at pH 10.5 and a dose of 1.284 mL L-1. Approximately 51% of struvite and 48% of calcite precipitates were identified in the generated sludge, which can possibly be used as supplementary material in agrochemical industry with further treatment.
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Affiliation(s)
- Arseto Yekti Bagastyo
- Department of Environmental Engineering, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia E-mail: ; Research Centre for Infrastructure and Sustainable Environment, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia
| | - Anita Dwi Anggrainy
- Research Centre for Infrastructure and Sustainable Environment, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia
| | - Syaima Gatneh
- Department of Environmental Engineering, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia E-mail:
| | - Ervin Nurhayati
- Department of Environmental Engineering, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia E-mail:
| | - Diah Susanti
- Department of Material and Metallurgical Engineering, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia
| | - Erwin Widodo
- Department of System and Industrial Engineering, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia
| | - Totok Soehartanto
- Department of Instrumentation Engineering, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia
| | - Idaa Warmadewanthi
- Department of Environmental Engineering, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia E-mail: ; Research Centre for Infrastructure and Sustainable Environment, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia
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Du P, Li X, Yang Y, Su Z, Li H, Wang N, Guo T, Zhang T, Zhou Z. Optimized coagulation pretreatment alleviates ultrafiltration membrane fouling: The role of floc properties and slow-mixing speed on mechanisms of chitosan-assisted coagulation. J Environ Sci (China) 2019; 82:82-92. [PMID: 31133272 DOI: 10.1016/j.jes.2019.02.027] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Revised: 02/26/2019] [Accepted: 02/27/2019] [Indexed: 06/09/2023]
Abstract
To alleviate ultrafiltration (UF) membrane fouling, the pre-coagulation of poly-aluminum chloride (PACl) with the aid of chitosan (CTS) was conducted for synthetic humic acid-kaolin water treatment. Pre-coagulation of three molecular weights (MW) CTSs (50-190 kDa (CTSL), 190-310 kDa (CTSM) and 310-375 kDa (CTSH)) was optimized with slow-mixing speeds of 30, 60 and 90 r/min, respectively. The removal efficiency and floc properties as well as membrane fouling were analyzed, and were compared to results obtained by conventional coagulation with PACl. Results showed that variations in floc properties could be ascribed to the coagulation mechanisms of CTSL/CTSM/CTSH at different slow-mixing speeds, resulting in reduced UF membrane fouling. Specifically, at the low speed of 30 r/min, all three CTS types produced flocs with similar properties, while CTSL resulted in the lowest removal efficiency and aggravated irreversible fouling. At the appropriate speed of 60 r/min, CTSM generated the most compact flocs with the combined effects of bridging and path mechanisms. The compact cake layer formed could alleviate irreversible fouling, which was beneficial for prolonging the operation of the UF membrane. At the high speed of 90 r/min, CTSH formed fragile flocs and aggravated irreversible membrane fouling. We considered membrane fouling to be affected by floc properties and the resultant removal efficiency, which was governed by the MW of the CTS used and the slow-mixing speed applied as well.
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Affiliation(s)
- Peng Du
- College of Architecture and Civil engineering, Beijing University of Technology, Beijing 100124, China
| | - Xing Li
- College of Architecture and Civil engineering, Beijing University of Technology, Beijing 100124, China
| | - Yanling Yang
- College of Architecture and Civil engineering, Beijing University of Technology, Beijing 100124, China
| | - Zhaoyang Su
- College of Architecture and Civil engineering, Beijing University of Technology, Beijing 100124, China
| | - Hang Li
- College of Architecture and Civil engineering, Beijing University of Technology, Beijing 100124, China
| | - Nan Wang
- College of Architecture and Civil engineering, Beijing University of Technology, Beijing 100124, China
| | - Tingting Guo
- College of Architecture and Civil engineering, Beijing University of Technology, Beijing 100124, China
| | - Tingting Zhang
- College of Architecture and Civil engineering, Beijing University of Technology, Beijing 100124, China
| | - Zhiwei Zhou
- College of Architecture and Civil engineering, Beijing University of Technology, Beijing 100124, China.
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Efficient treatment of oil sands produced water: Process integration using ion exchange regeneration wastewater as a chemical coagulant. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2019.03.070] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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6
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Effects of Mixing Conditions on Floc Properties in Magnesium Hydroxide Continuous Coagulation Process. APPLIED SCIENCES-BASEL 2019. [DOI: 10.3390/app9050973] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Magnesium hydroxide continuous coagulation process was used for treating simulated reactive orange wastewater in this study. Effects of mixing conditions and retention time on the coagulation performance and floc properties of magnesium hydroxide were based on the floc size distribution (FSD), zeta potential, and floc morphology analysis. Floc formation and growth in different reactors were also discussed. The results showed that increasing rapid mixing speed led to a decrease in the final floc size. The floc formation process was mainly carried out in a rapid mixer; a rapid mixing speed of 300 rpm was chosen according to zeta potential and removal efficiency. Reducing retention time caused a relatively small floc size in all reactors. When influent flow was 30 L/h (retention time of 2 min in rapid mixer), the average floc size reached 8.06 μm in a rapid mixer; through breakage and re-growth, the floc size remained stable in the flocculation basin. After growth, the final floc size reached 11.21 μm in a sedimentation tank. The removal efficiency of reactive orange is 89% in the magnesium hydroxide coagulation process.
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Zhao J, Wang A, Wei L, Ge W, Chi Y, Lai Y. Effect of kaolin on floc properties for reactive orange removal in continuous coagulation process. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2018; 78:571-577. [PMID: 30207998 DOI: 10.2166/wst.2018.327] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Magnesium hydroxide was used as a coagulant for treating reactive orange wastewater in a real continuous process. Effects of kaolin on coagulation performance and floc properties were investigated with controlled experiments through floc size distribution, zeta potential, scanning electron microscopy and Fourier transform infrared spectroscopy. Kaolin had significant influence on magnesium hydroxide-reactive orange floc formation and growth. The results showed that average floc size reached 16.31, 12.88 and 20.50 μm, respectively, in the rapid mixer, flocculation basin and sedimentation tank when kaolin concentration was 10 mg/L and reactive orange initial concentration was 0.25 g/L. The floc size tended to increase with the increase of kaolin suspension to 10 mg/L. All of the flocs under investigation showed that floc breakage led to decreased average floc size and remained stable in the flocculation basin. Reactive orange and kaolin could be removed effectively in the continuous coagulation process. Reactive orange was adsorbed in the surface of magnesium hydroxide through charge neutralization and adsorption.
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Affiliation(s)
- Jianhai Zhao
- Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin, 300384, China E-mail:
| | - Anmin Wang
- Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin, 300384, China E-mail:
| | - Lei Wei
- Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin, 300384, China E-mail:
| | - Wenqi Ge
- School of Control and Mechanical Engineering, Tianjin Chengjian University, Tianjin, 300384, China
| | - Yongzhi Chi
- Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin, 300384, China E-mail:
| | - Yanping Lai
- School of Energy and Safety Engineering, Tianjin Chengjian University, Tianjin, 300384, China
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Wang Z, Nan J, Ji X, Yang Y. Effect of the micro-flocculation stage on the flocculation/sedimentation process: The role of shear rate. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 633:1183-1191. [PMID: 29758870 DOI: 10.1016/j.scitotenv.2018.03.286] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2018] [Revised: 03/03/2018] [Accepted: 03/23/2018] [Indexed: 06/08/2023]
Abstract
Dynamic analysis on the variation of particle size distribution (PSD) and the fractal characteristics of PSD (Df) were investigated to better understand the continuous procedure of the floc growth and optimize the control of flocculation process. It was found that the flocculation process could be divided into three stages, i.e., the micro-flocculation stage, the growth stage and the steady (or breakage) stage. As the stage which is crucial to the morphology of micro-flocs (the building blocks of large flocs), the micro-flocculation stage plays an important role on flocculation/sedimentation process. The results showed that an increase in shear rate (11s-1<G<30s-1) during the micro-flocculation stage contributed to micro-flocs with larger size and more compact structure. As shear rate further increased (30s-1<G<55s-1), the micro-floc average size gently decreased from 13.61μm to 10.91μm, whereas two-dimension fractal dimension of micro-flocs gradually increased from 1.85 to 1.89. This indicated that further increase of shear rate during the micro-flocculation was incline to the formation of smaller micro-flocs with more compact structure. According to the results of final floc properties, the moderate shear rate (G=30s-1) benefited to the micro-floc formation to form final flocs with desired properties, further improved the treatment efficiency in the whole process. Based on the kinetics in the micro-flocculation stage, a conceptual model was proposed to describe the micro-floc growth under different shear rates, further revealed the reason for the different properties of final flocs under various shear rate during the micro-flocculation stage. Combining the results with model, it was concluded that shear rate during the micro-flocculation stage mainly affected final flocs by the domination of micro-floc structure. This research gives indications both for theoretical and actual works to improve the efficiency in the solid/liquid process.
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Affiliation(s)
- Zhenbei Wang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China
| | - Jun Nan
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China.
| | - Xiaoyu Ji
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China
| | - Yueming Yang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China
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Ayoub GM, Korban L, Al-Hindi M, Zayyat R. Removal of fouling species from brackish water reverse osmosis reject stream. ENVIRONMENTAL TECHNOLOGY 2018; 39:804-813. [PMID: 28345484 DOI: 10.1080/09593330.2017.1311946] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Accepted: 03/22/2017] [Indexed: 06/06/2023]
Abstract
Brine disposal from reverse osmosis (RO) systems remains a major challenge for the desalination industry especially in inland areas where discharge options are very limited. Solutions will entail the introduction of economic treatment processes that will alleviate the brine's negative impact on the environment and reduce its discharge volume. Such processes could act as an intermediary treatment process for the recycling of the brine through an additional RO stage which, for brackish water (BW) desalination, could lead to saving valuable water while reducing the amount of brine discharge. In this context, the study at hand attempts to evaluate the effectiveness of a one-step chemical process for the treatment of BWRO brine. This study seeks to determine optimal operating conditions relative to type, ratio, and dosage of alkalizing chemicals, pH and temperature, for substantially reducing the concentrations of scaling parameters such as calcium, magnesium, silica, and strontium. The results indicate that precipitation softening at pH = 11.5 using combined chemical dosages of NaOH and Na2CO3 in a ratio of 2:1 leads to substantial removal of calcium and magnesium (>95%) and moderately high removal of strontium and silica (>71%).
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Affiliation(s)
- G M Ayoub
- a Department of Civil and Environmental Engineering , American University of Beirut , Beirut , Lebanon
| | - L Korban
- a Department of Civil and Environmental Engineering , American University of Beirut , Beirut , Lebanon
| | - M Al-Hindi
- b Department of Chemical and Petroleum Engineering , American University of Beirut , Beirut , Lebanon
| | - R Zayyat
- a Department of Civil and Environmental Engineering , American University of Beirut , Beirut , Lebanon
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Zhao J, Shi H, Liu M, Lu J, Li W. Coagulation-adsorption of reactive orange from aqueous solution by freshly formed magnesium hydroxide: mixing time and mechanistic study. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2017; 75:1776-1783. [PMID: 28452769 DOI: 10.2166/wst.2017.037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The utilization of magnesium hydroxide was successfully carried out to remove reactive orange by coagulation-adsorption from aqueous solution. The coagulation-adsorption mechanisms and magnesium hydroxide-reactive orange floc property were analyzed through zeta potential, scanning electron microscope (SEM), X-ray diffraction and Fourier transform infrared spectroscopy (FT-IR). Flocculation Index was then discussed with controlled experiments using intelligent Particle Dispersion Analyzer (iPDA) and optimum rapid mixing time of 90 s was obtained for pH 12. The results of this study indicate that charge neutralization and adsorption are proposed to be the main coagulation mechanisms. The FT-IR spectra and SEM showed that reactive orange was adsorbed on the magnesium hydroxide surface during coagulation and adsorption. Freshly generated magnesium hydroxide can effectively remove reactive orange and the removal efficiency can reach 96.7% and 46.3% for coagulation and adsorption, respectively. Adsorption process accounts for 48% of the whole coagulation experiment. The removal efficiency decreased significantly with increasing magnesium hydroxide formation time.
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Affiliation(s)
- Jianhai Zhao
- Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China E-mail:
| | - Huanhuan Shi
- Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China E-mail:
| | - Meile Liu
- Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China E-mail:
| | - Jingfang Lu
- Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China E-mail:
| | - Wenpu Li
- Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China E-mail:
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Wei Y, Ji Q, Chen L, Hao J, Yao C, Dong X. Preparation of an inorganic coagulant-polysilicate–magnesium for dyeing wastewater treatment: Effect of acid medium on the characterization and coagulation performance. J Taiwan Inst Chem Eng 2017. [DOI: 10.1016/j.jtice.2017.01.020] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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Removal of reactive dyes from wastewater assisted with kaolin clay by magnesium hydroxide coagulation process. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2016.01.048] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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13
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Wang Z, Nan J, Yao M, Ren P, Yang Y. Evaluation of kaolin floc characteristics during coagulation process: a case study with a continuous flow device. RSC Adv 2016. [DOI: 10.1039/c6ra06046c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This work investigates the influence of decreasing shear rate on temporal evolution of floc properties in continuous flow device.
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Affiliation(s)
- Zhenbei Wang
- State Key Laboratory of Urban Water Resource and Environment
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin 150090
- PR China
| | - Jun Nan
- State Key Laboratory of Urban Water Resource and Environment
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin 150090
- PR China
| | - Meng Yao
- State Key Laboratory of Urban Water Resource and Environment
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin 150090
- PR China
| | - Pengfei Ren
- State Key Laboratory of Urban Water Resource and Environment
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin 150090
- PR China
| | - Yueming Yang
- State Key Laboratory of Urban Water Resource and Environment
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin 150090
- PR China
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Kee YL, Mukherjee S, Pariatamby A. Effective remediation of phenol,2,4-bis(1,1-dimethylethyl) and bis(2-ethylhexyl) phthalate in farm effluent using Guar gum--A plant based biopolymer. CHEMOSPHERE 2015; 136:111-117. [PMID: 25966329 DOI: 10.1016/j.chemosphere.2015.04.074] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Revised: 04/07/2015] [Accepted: 04/24/2015] [Indexed: 06/04/2023]
Abstract
This study was carried out to evaluate the efficiency of Guar gum in removing Persistent Organic Pollutants (POPs), viz. phenol,2,4-bis(1,1-dimethylethyl) and bis(2-ethylhexyl) phthalate (DEHP), from farm effluent. The removal efficiency was compared with alum. The results indicated that 4.0 mg L(-1) of Guar gum at pH 7 could remove 99.70% and 99.99% of phenol,2,4-bis(1,1-dimethylethyl) and DEHP, respectively. Box Behnken design was used for optimization of the operating parameters for optimal POPs removal. Scanning Electron Microscopy (SEM) and Fourier Transform Infrared (FTIR) spectroscopy studies were conducted on the flocs. SEM micrographs showed numerous void spaces in the flocs produced by Guar gum as opposed to those produced by alum. This indicated why Guar gum was more effective in capturing and removal of suspended particles and POPs as compared to alum. FTIR spectra indicated a shift in the bonding of functional groups in the flocs produced by Guar gum as compared to raw Guar gum powder signifying chemical attachment of the organics present in the effluent to the coagulant resulting in their removal. Guar gum is highly recommended as a substitute to chemical coagulant in treating POPs due to its non-toxic and biodegradable characteristics.
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Affiliation(s)
- Yang Ling Kee
- Institute of Biological Sciences, University of Malaya, 50603 Kuala Lumpur, Malaysia.
| | - Sumona Mukherjee
- Institute of Biological Sciences, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Agamuthu Pariatamby
- Institute of Biological Sciences, University of Malaya, 50603 Kuala Lumpur, Malaysia
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