Mitigation of eutrophication through phosphate removal by aluminium pillared bentonite from aquaculture discharge water

Kumararaja, P.; Sukumaran, Suvana; Saraswathy, R.; Lalitha, N.; Muralidhar, M.

doi:10.1016/j.ocecoaman.2019.104951

Cited by 27 publications

(11 citation statements)

References 50 publications

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“…Phosphate (soluble reactive phosphorus) is a critical nutrient for the growth of phytoplankton and algae [ 2 , 3 , 4 , 5 ]. At concentrations between 0.025 and 0.03 mg L −1 [ 6 ] or higher than 0.02 mg L −1 [ 7 , 8 ], phosphate induces the eutrophication of water bodies, resulting in the deterioration of water quality [ 9 , 10 ]. Thus, controlling the phosphate concentration in effluents prior to their discharge into water bodies is imperative for reducing pollution.…”

Section: Introductionmentioning

confidence: 99%

Continuous Phosphate Removal and Recovery Using a Calcium Silicate Hydrate Composite Monolithic Cryogel Column

et al. 2023

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Toward the development of a practical and green approach for removing phosphate from water, a monolithic cryogel based on starch and calcium silicate hydrate (Cry–CSH) was employed as a phosphate adsorbent in a continuous flow system for the first time. The influence of flow rate, initial phosphate concentration, and adsorbent height on the adsorption efficiency was investigated. As the rate of flow and the initial concentration of phosphate increased, the total quantity of adsorbed phosphate dropped; however, the performance of the column was greatly enhanced by an increase in adsorbent height. The experimental data fit the Adams–Bohart model better than the Thomas and Yoon–Nelson models at the beginning of the adsorption process. To evaluate its applicability, the continuous flow system based on the monolithic Cry–CSH column was applied for the removal of phosphate from the discharge effluent of the Patong Municipality Wastewater Treatment Plant (Phuket, Thailand), achieving an excellent total adsorption of 94.61%.

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Section: Introductionmentioning

confidence: 99%

Continuous Phosphate Removal and Recovery Using a Calcium Silicate Hydrate Composite Monolithic Cryogel Column

et al. 2023

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“…This is similar to many reports using other Zr-containing adsorbents (Zhang et al, 2013, Huang et al, 2015. In acidic conditions, the protonation of surface functional groups and Zr release from the surface of clay increases the adsorption (Kumararaja et al, 2019).…”

Section: Zrmcsupporting

confidence: 91%

Characterization and modification of natural clay deposits to develop clay-based adsorbent to remove phosphorus from contaminated water

Nargis¹

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Modification of natural clays may be a useful approach to produce an effective and low-cost adsorbent to control phosphorous, which is a key factor in controlling the eutrophication of surface waters. In this study, natural clay samples were collected, characterized, modified with ZrCl4, and then their adsorption capacity for removing phosphorus from contaminated water was studied. XRD analysis showed that the natural clay consists of kaolinite, illite, and nontronite as dominant clay mineral phases. The maximum adsorption capacity of the modified clay increased from 0.493 to 11.83 mg P/g compared to the unmodified clay. The adsorption process was fast for both natural and modified samples, achieving more than 80% and 90% phosphorus removal with natural and modified samples, respectively in less than 4 hours. The adsorption data for both clays best fit the Langmuir isotherm, and the rate of phosphorus adsorption was found to follow a pseudo-secondorder kinetic model. The adsorption capacity of both adsorbents decreased with increasing pH, and for the modified clay the change was more significant. Full factorial design and response surface methodology were applied to evaluate and optimize the effects of initial P concentration, contact time, pH, and dose. From the model, the maximum P removal efficiency predicted for the synthetic solution was 91.5% and 99.9% by natural and modified clay, respectively. R2(≈0.98) indicates that the observed results fitted well with the model prediction. Similar to the batch studies, the fixed bed column study showed the developed adsorbents are efficient in removing phosphorus from water in a continuous process as well.

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“…168 Aluminium pillared bentonite is an effective absorbent for removing P from aquaculture and sewage systems because of its improved porosity and surface area. 169 The Langmuir monolayer adsorption capacity of the tested natural adsorbent varies from 0.1 to 40 g P/kg. 168,170 Some natural materials, including apatite, dolomite, gravel, laterite, limestone, sand, zeolite and gastropod shells, can also be used to trap P. 168 With a high specific surface area, clay minerals are the most commonly used absorbents for P removal.…”

Section: Chemical and Physical Phosphorus Removalmentioning

confidence: 99%

Review of waste phosphorus from aquaculture: Source, removal and recovery

Luo

2022

Reviews in Aquaculture

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The contribution of phosphorus to water body eutrophication is a global environmental problem, and rapid increases in aquaculture are considered a significant source of phosphorus discharged into the environment. The current review focuses on the source of aquaculture waste phosphorus and measures to decrease phosphorus release into the environment. Because diets are a significant source of phosphorus in fed aquaculture systems, improving the utilization efficiency of dietary phosphorus can reduce the amount of waste phosphorus at the source. A wide range of removal and recovery technologies has been identified, including adsorption, crystallization, enhanced biological phosphorus removal (EBPR), denitrifying phosphorus removal, heterotrophic nitrification aerobic denitrification (HAND) and photosynthetic organism removal. Recovery technologies were also reviewed, particularly sludge phosphorus from recirculating aquaculture systems. A new method using bacteria to immobilize waste nitrogen and phosphorus into bioflocs has been proposed as a better solution. However, most of these technologies have only been implemented at the lab scale to pilot scale. Further studies are necessary to determine the working conditions and removal capacities of related technologies on a commercial scale.Moreover, phosphorus removal methods must be selected based on a consideration of recyclability.

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Mitigation of eutrophication through phosphate removal by aluminium pillared bentonite from aquaculture discharge water

Cited by 27 publications

References 50 publications

Continuous Phosphate Removal and Recovery Using a Calcium Silicate Hydrate Composite Monolithic Cryogel Column

Continuous Phosphate Removal and Recovery Using a Calcium Silicate Hydrate Composite Monolithic Cryogel Column

Characterization and modification of natural clay deposits to develop clay-based adsorbent to remove phosphorus from contaminated water

Review of waste phosphorus from aquaculture: Source, removal and recovery

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