Co-transport of Cu2+, Pb2+, Cd2+, and Zn2+ in the columns of polyaluminium chloride and anionic polyacrylamide water treatment residuals

2022 ◽  
Vol 45 ◽  
pp. 102475
Author(s):  
Runbin Duan ◽  
Clifford B. Fedler ◽  
Xingfa Li ◽  
Xiaofei Jiao
Keyword(s):  
Water Treatment ◽  
Water Treatment Residuals ◽  
Polyaluminium Chloride ◽  
Anionic Polyacrylamide

scholarly journals Adsorption of pyridine from aqueous solutions onto polyaluminium chloride and anionic polyacrylamide water treatment residuals

2021 ◽  
Vol 83 (7) ◽  
pp. 1753-1763
Author(s):  
Runbin Duan ◽  
Clifford B. Fedler ◽  
Xiaofei Jiao
Keyword(s):  
Water Treatment ◽  
Contaminated Soils ◽  
Climatic Conditions ◽  
Maximum Adsorption Capacity ◽  
Pyridine Adsorption ◽  
Water Treatment Residuals ◽  
Adsorption Mechanisms ◽  
Non Linear ◽  
Polyaluminium Chloride ◽  
Anionic Polyacrylamide

Abstract The adsorption performance of pyridine onto polyaluminium chloride (PAC) and anionic polyacrylamide (APAM) water treatment residuals (WTRs) was investigated by batch experiments. This study confirmed the assumption that PAC–APAM WTRs had the ability to remove pyridine. The non-linear Dubinin–Radushkevich model and non-linear Freundlich model better described the isotherms, indicating that the adsorption was a chemically controlled multilayer process. The pyridine adsorption rate was simultaneously controlled by external film diffusion and intraparticle diffusion. The adsorption of pyridine was an endothermic reaction with randomness increase. The pyridine adsorption decreased with pH increase. Pyridine removal was observed to be a linear increase from 6.16% to 96.18%, with the increase of dosage from 2.5 g/L to 15 g/L. The Langmuir maximum adsorption capacity was 3.605 mg/g while the theoretical isotherm saturation capacity was 9.823 mg/g. Therefore, PAC–APAM WTRs recycled into contaminated soils for remediation is expected to be an innovative alternative disposal method. More research is recommended in the future to identify detailed adsorption mechanisms and the most appropriate mixing ratio of PAC–APAM WTRs to contaminated soils under various climatic conditions.

scholarly journals Modeling phosphorus adsorption onto polyaluminium chloride water treatment residuals

2020 ◽  
Author(s):  
Runbin Duan ◽  
Clifford B. Fedler
Keyword(s):  
Water Treatment ◽  
Water Solution ◽  
Drinking Water Treatment ◽  
Order Kinetic ◽  
Water Treatment Residuals ◽  
Phosphorus Adsorption ◽  
P Adsorption ◽  
P Concentration ◽  
Ann Models ◽  
Polyaluminium Chloride

Abstract Beneficial reuse and appropriate disposal of water treatment residuals (WTRs) are of great concern for sustainable drinking water treatment. Using WTRs to remove phosphorus (P) is widely regarded as a feasible approach. However, the information is still limited on air-dried WTRs containing polyaluminium chloride (PAC) and anionic polyacrylamide (APAM) used to adsorb P. The objectives of this study were to construct artificial neural network (ANN) models for P adsorption onto WTRs from distilled de-ionized (DDI) water solution and stormwater, to investigate the performance of ANN in predicting phosphorous adsorption, and to model isotherm adsorption, kinetics, and thermodynamics by using the index of model performance. Batch experiments were performed with different WTRs dosage, pH, initial P concentration, temperature, and time. ANN models accurately predicted the P concentration at equilibrium. Non-linearized Langmuir model fitted the isotherm data best. Pseudo second-order kinetic model provided a better fit to experimental data. The adsorption process may be at least simultaneously controlled by surface adsorption and intraparticle diffusion. The P adsorption is a homogenous monolayer adsorption that is spontaneous, endothermic, and entropy production process. WTRs were found to be favorable and effective in removing P, but the P removals had significant differences in both solutions.

scholarly journals Removing Iron and Organic Substances from Water over the Course of Its Treatment with the Application of Average and Highly Alkaline Polyaluminium Chlorides

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1367
Author(s):  
Izabela Krupińska
Keyword(s):  
Water Treatment ◽  
Human Consumption ◽  
Iron Ions ◽  
Organic Substances ◽  
Iron Compounds ◽  
Polyaluminum Chloride ◽  
Coagulation Process ◽  
Lack Of Information ◽  
Organic Complexes ◽  
Polyaluminium Chloride

In topic-related literature pertaining to the treatment of water, there is a lack of information on the influence of iron ions in highly basic polyaluminum chlorides on the efficiency of purifying water with increased contents of organic substance. The aim of this work was to determine the changes in the content of organic substances as well as iron compounds in water intended for human consumption following unit treatment processes with particular attention paid to the coagulation process. As coagulants, polyaluminium chloride PAXXL10 with an alkalinity of 70%, as well as polyaluminium chloride PAXXL1911 with an alkalinity of 85% the composition of which also contained iron, were tested. The analysis of the obtained results showed that iron compounds and organic substances were removed to the greatest extent by the coagulation process, which also had a significant influence on the final efficiency of water treatment. The effectiveness of water treatment was determined by the type of tested polyaluminum chloride, which influenced the formation of iron-organic complexes. The reason behind the formation of colored iron-organic complexes during coagulation using PAXXL1911 coagulant was the high pH (approx. 8), at which the functional groups of organic substances, due to their dissociation, are more reactive in relation to iron, and possibly the fact of introducing additional iron ions along with the coagulant.

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