Preparation of polyaluminum zirconium silicate coagulant and its performance in water treatment

Zhuang, Jiayan; Qi, Yaohui; Yang, Huizhu; Li, Haoyu; Shi, Taihong

doi:10.1016/j.jwpe.2021.102023

Cited by 26 publications

(12 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The use of chemical coagulants in the coagulation/flocculation of suspended particles in various types of wastewaters has been widely reported by multiple sources [ 7 , 8 , 9 , 10 ]. However, the attendant negative effects of chemical coagulants, such as the production of high volumes of toxic sludge and precipitation of metal ions, have become a major concern to environmentalists, hence the introduction of biopolymer coagulants [ 10 , 11 , 12 ]. Biopolymer substances such as chitosan have been reported to possess the properties of both coagulant and flocculant.…”

Section: Introductionmentioning

confidence: 99%

Response Surface Methodology (RSM) Approach to Optimization of Coagulation-Flocculation of Aquaculture Wastewater Treatment Using Chitosan from Carapace of Giant Freshwater Prawn Macrobrachium rosenbergii

et al. 2023

View full text Add to dashboard Cite

The major sources of waste from aquaculture operations emanates from fish or shellfish processing and wastewater generation. A simple technique called coagulation/flocculation utilizes biowaste from aquaculture to produce chitosan coagulant for wastewater treatment. A chemical method was applied in the present study for chitin and chitosan extraction from carapace of Macrobrachium rosenbergii and subsequent application for removal of turbidity and salinity from shrimp aquaculture wastewater. Box-Behnken in RSM was used to determine the optimum operating conditions of chitosan dosage, pH, and settling time, after which quadratic models were developed and validated. Results show that 80 g of raw powder carapace yielded chitin and chitosan of 23.79% and 20.21%, respectively. The low moisture (0.38%) and ash (12.58%) content were an indication of good quality chitosan, while other properties such as water-binding capacity (WBC), fat-binding capacity (FBC), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscope (SEM) confirmed the structure and the α-group, as well as the rough morphology of chitosan. In addition, the high solubility (71.23%) and DDA (85.20%) suggested good coagulant potentials. It was recorded in this study that 87.67% turbidity was successfully removed at 20 mg/L of chitosan dosage and 6.25 pH after 30 min settling time, while 21.43% salinity was removed at 5 mg/L of chitosan dosage, 7.5pH, and 30 min settling time. Therefore, the process conditions adopted in this study yielded chitosan of good quality, suitable as biopolymer coagulant for aquaculture wastewater treatment.

show abstract

Section: Introductionmentioning

confidence: 99%

Response Surface Methodology (RSM) Approach to Optimization of Coagulation-Flocculation of Aquaculture Wastewater Treatment Using Chitosan from Carapace of Giant Freshwater Prawn Macrobrachium rosenbergii

et al. 2023

View full text Add to dashboard Cite

show abstract

“…The parameters of thermodynamic study such as Gibbs free energy (ΔG, J/mol), entropy change (ΔS, J/K mol) and enthalpy change (ΔH, J/mol) use van't Hoff Eqs. (11,12,13) [78]:…”

Section: Referencesmentioning

confidence: 99%

Composite fabrication and characterization of crosslinked polyaniline/Pterocladia capillacea-activated carbon for adsorption of direct blue-86 dye from water

et al. 2022

View full text Add to dashboard Cite

The fabrication of crosslinked polyaniline/Pterocladia capillacea-activated carbon composite (CrossPANI/P-AC) at different ratios (1:0, 1:0.2, 1:0.6, and 1:1) was studied. CrossPANI/P-AC composites were fabricated by the in situ polymerization of aniline using hydrogen chloride as an acidic dopant, and ammonium persulfate as initiator, while Pterocladia capillacea-activated carbon was synthesized by the chemical activation method and incorporated into the polymer matrix. The samples were characterized by the terms such as Fourier transform infrared (FTIR) spectroscopy, Brunauer–Emmett–Teller, X-ray diffraction (XRD), thermogravimetric analysis, scanning electron microscopy, and energy-dispersive X-ray spectroscopy (EDX). FTIR spectroscopy showed the main characteristic peak positions of CrossPANI/P-AC; XRD showed low crystallinity of CrossPANI/P-AC. A high specific surface area for CrossPANI/P-AC was achieved at a ratio of 1:0.2 where Brunauer–Emmett–Teller surface area, total pore volume, and mean pore diameter values were 166.10 m2/g, 0.0141 cm3/g, and 3.40 nm, respectively. The capability of CrossPANI/P-AC (1:0.2) composite as adsorbent for Direct blue-86 (DB-86) dye from aqueous solution was investigated. The impact of initial dye concentration, temperature, pH, and contact time on the DB-86 dye adsorption from its water solution was examined. The equilibrium adsorption data were well represented by the Langmuir isotherm achieving maximum monolayer capacity (Qm) of 163.93 mg/g at a dose of 0.5 g/L. In contrast, the kinetic adsorption data were well fit by the pseudo-second-order model. Thermodynamic analysis demonstrated that DB-86 dye adsorption occurs spontaneously, endothermically, and physically in nature. The results demonstrated that these composites effectively removed DB-86 dye from aqueous solutions and could be recycled. Graphical abstract

show abstract

“…The deterioration of water quality is becoming more and more serious with rapid economic growth. The traditional process of wastewater treatment cannot ensure a qualified and safe effluent. , The addition of flocculants is a key step in the wastewater treatment process, among which inorganic flocculants have been widely used due to their simple preparation and convenient use. , So far, many researchers have proposed a variety of inorganic polymer flocculants, such as polyaluminum chloride, polyaluminum sulfate, polyaluminum phosphate, polyaluminum ferric silicate (PAFSi), polyaluminum silicate, and other inorganic polymer flocculants, as well as polyaluminum composite flocculants doped with organic polymers. − With the development of the times, many researchers began to prepare the flocculant of PAF by using some solid wastes. − The principle of this method is to extract the iron, aluminum, and silicon into a leaching solution from the solid wastes, and then, the leaching solution could react and polymerize under certain conditions. The investigations have achieved great success; for example, Ding et al studied the preparation of high-efficiency coagulant PAFCaC with coal gangue as a raw material, which was used to treat industrial wastewater.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Application of Polyaluminum Ferric Sulfate from Red Mud: Behaviors of Leaching, Polymerizing, and Coagulation

Li,

Zhang,

Zhu

2024

ACS Omega

View full text Add to dashboard Cite

Red mud is a solid waste containing valuable components, such as aluminum and iron. This paper aims to recover aluminum and iron from red mud by acid leaching and prepare polyaluminum ferric sulfate (PAFS) to apply for the turbidity reduction treatment of coal slurry water. The behaviors of leaching, polymerizing, and coagulation were analyzed by leaching thermodynamics and advanced micro-detection methods. More than 90% of aluminum and 60% of iron in red mud were dissolved into the leaching solution by using 50% sulfuric acid (v/v) with 7 mL/g at 100 °C for 2 h, where the crystal lattice of cancrinite was significantly destroyed to promote the dissolution of aluminum. The low polymerization (Al + Fe) a , medium polymerization (Al + Fe) b , and high polymerization (Al + Fe) c could be generated in PAFS by adjusting the basicity of the leaching solution with 0.7−0.9. The removal efficiency of turbidity of wastewater could reach more than 95% by using PAFS at 25 mg/L in the pH range of 6.0−7.0. The turbidity reduction mechanism included not only the electric neutralization of (Al + Fe) a but also the adsorption of (Al + Fe) b and the entrapment effect of (Al + Fe) c . This current study contributes to the future development of red mud based on flocculants containing aluminum and iron for wastewater treatment.

show abstract

Preparation of polyaluminum zirconium silicate coagulant and its performance in water treatment

Cited by 26 publications

References 45 publications

Response Surface Methodology (RSM) Approach to Optimization of Coagulation-Flocculation of Aquaculture Wastewater Treatment Using Chitosan from Carapace of Giant Freshwater Prawn Macrobrachium rosenbergii

Response Surface Methodology (RSM) Approach to Optimization of Coagulation-Flocculation of Aquaculture Wastewater Treatment Using Chitosan from Carapace of Giant Freshwater Prawn Macrobrachium rosenbergii

Composite fabrication and characterization of crosslinked polyaniline/Pterocladia capillacea-activated carbon for adsorption of direct blue-86 dye from water

Preparation and Application of Polyaluminum Ferric Sulfate from Red Mud: Behaviors of Leaching, Polymerizing, and Coagulation

Contact Info

Product

Resources

About