Characterization of water treatment sludge and its reuse as coagulant

Tauheed, A.; Ahmad, Kafeel; Ahad, Abdul; Alam, Mehtab

doi:10.1016/j.jenvman.2016.08.010

Cited by 114 publications

(42 citation statements)

References 25 publications

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“…Aluminum salts are preferred for water treatment. They hydrolyze in water to aluminum hydroxide and then the colloidal and suspended contaminants are removed by charge neutralization, sweep floc mechanism, and adsorption onto hydroxide precipitates [63]. Sludges generated from surface water treatments are called post-coagulation residuals and their composition depends on the coagulant used-iron (Fe-SWTRs) or aluminum (Al-SWTRs) [59].…”

Section: Post-coagulation Residualsmentioning

confidence: 99%

Removal of Heavy Metals and Metalloids from Water Using Drinking Water Treatment Residuals as Adsorbents: A Review

et al. 2019

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Heavy metal contamination is one of the most important environmental issues. Therefore, appropriate steps need to be taken to reduce heavy metals and metalloids in water to acceptable levels. Several treatment methods have been developed recently to adsorb these pollutants. This paper reviews the ability of residuals generated as a by-product from the water treatment plants to adsorb heavy metals and metalloids from water. Water treatment residuals have great sorption capacities due to their large specific surface area and chemical composition. Sorption capacity is also affected by sorption conditions. A survey of the literature shows that water treatment residuals may be a suitable material for developing an efficient adsorbent for the removal of heavy metals and metalloids from water.

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Section: Post-coagulation Residualsmentioning

confidence: 99%

Removal of Heavy Metals and Metalloids from Water Using Drinking Water Treatment Residuals as Adsorbents: A Review

et al. 2019

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“…; Ahmad et al . ). One can cite their usage as coagulant or coagulant aid for the treatment of different polluted effluents.…”

Section: Introductionmentioning

confidence: 97%

“…Huge amounts of water treatment sludge-based coagulants are daily generated from water and wastewater treatment plants (Babatunde & Zhao 2007). To evaluate these enormous quantities, several applications have been identified in recent years (Dassanayake et al 2015;Ahmad et al 2016). One can cite their usage as coagulant or coagulant aid for the treatment of different polluted effluents.…”

Section: Introductionmentioning

confidence: 99%

Assessment of coagulation‐ultrafiltration performance for the treatment of primary wastewater using alum sludge

Mazari

Abdessemed

Szymczyk

et al. 2018

Water & Environment J

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The main purpose of this research was to develop an effective and inexpensive pretreatment for ultrafiltration (UF) membrane process in order to treat a primary effluent for its reuse in several applications by avoiding biological treatment. For that the impacts of reuse alum sludge liquid recovered by the drinking water treatment plant of Boudouaou (Algiers area) has been examined on the water quality in coagulation–sedimentation processes. The tests were carried out on a primary effluent of wastewater treatment plant. The elemental analysis by x‐ray fluorescence showed that the tested sludge is composed mainly of Al2O3 (41%) and SiO2 (44%). The efficiency of alum sludge as primary coagulant was compared with a conventional metal‐ion coagulant (fresh alum) using a jar test apparatus for simultaneous removals of turbidity, UV254 and chemical oxygen demand (COD). For dose of 30 mg Al/L, the sludge was effective as primary coagulant for removing the turbidity, COD and UV254.

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“…In meeting the potable water usage demand, AWTR is also expected to increase. It is therefore not feasible to continuously deposit AWTR in landfills, hydric and lagoons as they are deposited without any treatment [14,15]. Therefore, efficient and sustainable management of generated AWTR in an eco-friendly and economical way is essential for the water sector and the environment.…”

Section: Introductionmentioning

confidence: 99%

Effect of ion exchange dialysis process variables on aluminium permeation using response surface methodology

Asante-Sackey

Rathilal

Pillay

et al. 2019

Environmental Engineering Research

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This study investigated aluminum permeation using a counter flow ion exchange dialysis (IED) system. The optimum conditions for permeation were investigated using response surface methodology (RSM). Effect of four factors- feed concentration (100-2,000 ppm, A), feed flow rate (25-85%, B), sweep concentration (0.25-1 N HCl, C) and sweep flow rate (25-85%, D) were studied using face centered central composite (FC-CCD) statistical experimental design. A RSM model was developed based on the experimental permeation data and the response plot was developed. The FC-CCD model predicted permeation correlated with the experimental data. The regression coefficient (R<sup>2</sup>) was found to be 0.9568. The experiment showed the ascending order of the effect of the variables is D < B < C < A. In a counter flow IED for Al permeation, the sweep flow rate is insignificant (p > 0.05). Experimental validation demonstrated for target permeation of 70% was 68.8% ± 2.22%. This suggested that the RSM was a suitable tool in optimizing Al-permeation.

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Characterization of water treatment sludge and its reuse as coagulant

Cited by 114 publications

References 25 publications

Removal of Heavy Metals and Metalloids from Water Using Drinking Water Treatment Residuals as Adsorbents: A Review

Removal of Heavy Metals and Metalloids from Water Using Drinking Water Treatment Residuals as Adsorbents: A Review

Assessment of coagulation‐ultrafiltration performance for the treatment of primary wastewater using alum sludge

Effect of ion exchange dialysis process variables on aluminium permeation using response surface methodology

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