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Showing 3 results for Polyacrylamide
Sorption of Cd from Aqueous Solutions by Natural and Polyacrylamide-Modified Montmorillonite
S. Farahi, M. Hamidpour, H. Shirani, H. Dashti, M. Heshmati,
Volume 17, Issue 66 (2-2014)
Abstract
This research was conducted to study the effect of natural and polyacrylamide-modified montmorillonite on the sorption of Cd from aqueous solutions. The sorption of Cd on the sorbents was studied as a function of pH (Cd concentration: 10 mg L-1) in the range of 4-8.5, and as a function of metal concentration (Cd concentration in the range of 1-10 mgL-1) using a 24h batch equilibration. Experimental and modeling data from equilibrium investigations revealed that the Koble–Corrigan sorption model describes the interaction between Cd and the two sorbents better than the Freundlich and Langmuir models. The values of KF constant of Freundlich and KL constant of Langmuir models were higher for sorption of Cd onto the modified montmorillonite than for those of natural montmorillonite. Maximum sorption capacity calculated from the Langmuir model was 0.6 and 0.7 mg g-1 for natural and modified montmorillonite, respectively. These values are indications of high sorption affinity of Cd to montmorillonite in the presence of polyacrylamide. The amount of Cd sorbed by modified montmorillonite decreased by increasing solution pH while Cd sorption by natural montmorillonite increased by increasing the solution pH.
The Effect of Polyacrylamide on Erosion, Runoff and Infiltration of a Silty Loam Soil
N. Rashidi, M. Naderi, Sh. Ghorbani Dashtaki,
Volume 21, Issue 4 (2-2018)
Abstract
Nowadays application of soil conditioners for mitigation and reduction of runoff is a current method. Considering the advantages of Polyacrylamide (PAM), this study was arranged to evaluate impacts of this soil conditioner on soil infiltration rate, runoff and erosion control. To fulfill the goal, a factorial experiment in a completely randomized design was carried out with four PAM treatments (0, 6, 10, 20 kgha-1), three slope levels (3, 6 and 9 %), three irrigation treatments and three replications. Surficial (0-10 cm) soil samples were collected from Shahrekord University campus and poured into square plots (55×55cm) with 15 cm depth, after pretreatments. The plots were treated with a simulated rainfall intensity of 36 mm.h-1 for 15 minutes and the attributed runoff, sediment load and drained water were collected and measured. The results showed significant differences among the runoff and soil erosion of control and of PAM treated soils. PAM minimized the raindrop negative impacts on soils and improved water infiltration and diminished the attributed runoff. Soil treatment with PAM as a soil conditioner significantly reduced soil erosion and sediment yield in all treatments.

Optimum Dose Identification of Organic and Inorganic Coagulants for Stone Quarrying Industries' Wastewater Treatment
Narges Sobhani-Malekabadi, Mohammad Nemati Varnosfaderany, Nourollah Mirghaffari, Monire Sadeghi-Rad,
Volume 30, Issue 3 (10-2026)
Abstract
The application of coagulation processes for the treatment of stone quarrying wastewater has increased considerably in recent years. However, limited information is available regarding the appropriate coagulant type, optimum dosage, and pollutant removal efficiency. This study aimed to evaluate the performance of several organic and inorganic coagulants, including polyaluminum chloride (PAC), aluminum sulfate (alum), ferric chloride, zeolite, anionic polyacrylamide (APAM), and cationic polyacrylamide (CPAM), for the treatment of wastewater generated from different stone-processing industries (granite, marble, and travertine) located in Mahmoudabad Industrial Town, Isfahan, Iran. In this experimental study, the effects of coagulant dosage and mixing conditions on the treatment of four types of raw wastewater were investigated using the Response Surface Methodology (RSM). The results indicated that the optimum dosages of zeolite, ferric chloride, and PAC were 200 mg/L, while the optimum dosage of aluminum sulfate was 100 mg/L. For both anionic and cationic polyacrylamide, the optimum dosage was 0.5 mg/L. APAM, CPAM, and PAC exhibited the highest treatment performance among the tested coagulants, respectively. Zeolite showed the lowest removal efficiency (16.5%) for white travertine wastewater, whereas APAM achieved the highest removal efficiency (98.1%) for marble wastewater. Furthermore, analysis of the operational parameters demonstrated that mixing speed and coagulant dosage had the greatest influence on turbidity removal, whereas mixing time showed a comparatively lower effect. Overall, polymer-based coagulants, particularly APAM and CPAM, proved to be highly effective for the treatment of stone-processing wastewater
 

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