Synthesis and coagulation performance of composite poly-aluminum-ferric-silicate-chloride coagulants in water and wastewater

Tolkou, Athanasia K.; Zouboulis, Anastasios

doi:10.1080/19443994.2014.933614

Cited by 28 publications

(24 citation statements)

References 18 publications

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“…According to Assou et al [90], the most suitable coagulant is FeCl 3 at the concentration of 3000 mg/L with a sludge production of 700 ml/L. Recently, relatively new types of coagulation reagents were developed in order to increase the efficiency of the coagulation-flocculation process, such as pre-polymerized coagulants and an alternative mixture of aluminum, ferric, and silicate salts incorporated together in a new product [113], which exhibited better coagulation efficiency [114]. According to other studies, the addition of ferric or aluminum coagulants to fresh leachates resulted in a 25%-38% reduction of COD values while higher removal capacities were obtained for the partially stabilized leachates and the corresponding reduction exceeded 75% when the pH value was adjusted to 10.…”

Section: Flocculation-coagulationmentioning

confidence: 99%

Novel and Conventional Technologies for Landfill Leachates Treatment: A Review

et al. 2016

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Abstract:Municipal solid waste final disposal represents an environmental burden worldwide since landfilling, or open dumping, is still the preferred solution for the end of life of solid discarded materials. This study aims to review the technological innovations applied for landfill leachate treatment, taking into consideration the experiences obtained during the past years and the solutions which have been implemented. The review showed that both biological and physiochemical treatments are not able to achieve the requested water quality level, according to the limits established by regulations, whether applied in a single treatment or multiple treatments. In order to respect sustainable release limits to guarantee environmental protection, the construction of depuration systems and combining biological and physiochemical treatment methods is considered of the utmost importance. The review looks at possible joint applications of different treatment techniques reviewed by other studies and considers the state of the art of current research. Combined technical solutions suggested within the 2016 peer-reviewed papers are presented and discussed as a sustainable way to effectively treat landfill leachate, giving particular attention to feasible solutions for developing countries.

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Section: Flocculation-coagulationmentioning

confidence: 99%

Novel and Conventional Technologies for Landfill Leachates Treatment: A Review

et al. 2016

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“…The AMD-PAFS coagulant not only compared favourably with PFS coagulants but also with other synthetic coagulants. For example, a poly-aluminium-silicate-chloride coagulant (PSiFAC) was synthesized and tested in the treatment of simulated surface water [45]. A 99% turbidity removal was obtained at a PSiFAC concentration of 100 mg/L.…”

Section: Coagulant Production and Testingmentioning

confidence: 99%

Synthesis of Poly-Alumino-Ferric Sulphate Coagulant from Acid Mine Drainage by Precipitation

Mwewa

Stopić

Ndlovu

et al. 2019

Metals

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The wastes generated from both operational and abandoned coal and metal mining are an environmental concern. These wastes, including acid mine drainage (AMD), are treated to abate the devastating effects they have on the environment before disposal. However, AMD contains valuable resources that can be recovered to subsidize treatment costs. Two of the major constituents of coal AMD are iron and aluminium, which can be recovered and engineered to function as coagulants. This work examines the potential of producing a poly-alumino-ferric sulphate (AMD-PAFS) coagulant from coal acidic drainage solutions. The co-precipitation of iron and aluminium is conducted at pH values of 5.0, 6.0 and 7.0 using sodium hydroxide in order to evaluate the recovery of iron and aluminium as hydroxide precipitates while minimizing the co-precipitation of the other heavy metals. The precipitation at pH 5.0 yields iron and aluminium recovery of 99.9 and 94.7%, respectively. An increase in the pH from 5.0 to 7.0 increases the recovery of aluminium to 99.1%, while the recovery of iron remains the same. The precipitate formed at pH 5.0 is used to produce a coagulant consisting of 89.5% and 10.0% iron and aluminium, respectively. The production of the coagulant is carried out by dissolving the precipitate in 5.0% (w/w) sulphuric acid. Subsequently, the treatment of the brewery wastewater shows that the AMD-PAFS coagulant is as efficient as the conventional poly ferric sulphate (PFS) coagulant. The turbidity removal is 91.9 and 87.8%, while the chemical oxygen demand (COD) removal is 56.0 and 64.0% for AMD-PAFS and PFS coagulants, respectively. The developed process, which can easily be incorporated into existing AMD treatment plants, not only reduces the sludge disposal problems but also creates revenue from waste.

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“…In recent decades, people have produced various types of polymer composite coagulants like poly-silicic-cation (PSiCs), 4,5 polymeric aluminum ferric sulfate (PAFS), 6 polyaluminum ferric silicate chloride (PAFSC) 7,8 and polyaluminum chloridechitosan (PACC) 9 etc. The efficiency of these new coagulants is higher than those without complex substances.…”

Section: Introductionmentioning

confidence: 99%