Evaluating the suitability of synthetic organic polymers to replace iron salts in the purification of humic and sediment-rich runoff

Heiderscheidt, Elisangela; Leiviskä, Tiina; Ronkanen, Anna‐Kaisa; Kløve, Bjørn

doi:10.1080/19443994.2015.1043954

Cited by 6 publications

(12 citation statements)

References 35 publications

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“…Natural water samples were used and five commercially available coagulants were tested. The synthetic organic polymer pDMAC and the iron based coagulant FS were selected based on results from previous studies (Heiderscheidt et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Coagulation of humic waters for diffused pollution control and the influence of coagulant type on DOC fractions removed

Heiderscheidt

Leiviskä

Kløve

2016

Journal of Environmental Management

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This study examined the suitability of organic coagulants for treatment of typically humic peat extraction runoff water by comparing their performance with that of ferric sulphate (FS). The influence of coagulant type on dissolved organic carbon (DOC) fractions removed was analysed in detail using LC-OCD-OND (size exclusion liquid chromatography coupled with organic carbon and organic nitrogen detection) fractionation techniques. In general, lower coagulant dosage was needed under acidic (pH 4.5) than neutral (pH 6.5) conditions. Chitosan (Chit) and poly(diallyldimethyl) ammonium chloride (pDMAC) required significantly lower dosage (40-55%) than FS for acceptable purification, while a tannin-based coagulant (Tan2) required substantially higher dosage (55-75%) independent of water pH. FS demonstrated the best removal of DOC (<81%) and phosphorus (<93%) followed by pDMAC, while Chit and Tan2 achieved the highest removal of suspended solids (SS) (<58%), with flocs formed by Tan2 presenting the best settling properties. Higher molecular weight (MW) DOC fractions were more efficiently removed by all coagulants, with FS being the most efficient (biopolymers 69% and humic substances 91%), followed by Tan2. FS also displayed satisfactory removal of lower MW fractions (building blocks ~46% and low MW neutrals 62%). Overall, FS was the best performing coagulant.Nevertheless, the organic polymers demonstrated satisfactory overall performance, achieving purification rates mostly inside the requirements set by Finnish environmental authorities.

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Section: Introductionmentioning

confidence: 99%

Coagulation of humic waters for diffused pollution control and the influence of coagulant type on DOC fractions removed

Heiderscheidt

Leiviskä

Kløve

2016

Journal of Environmental Management

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“…Precisely, while treating aquaculture water with dissolved organic carbon in terms of humic acids, charge neutralization and precipitation are dominant mechanisms of the coagulation process. Metal salts usually have more excellent neutralization capability over organic polymers, and hence, the efficiency of inorganic coagulants for treatment of these wastewaters is supposed to be high (Heiderscheidt et al 2016;Sillanpää et al 2018). Moreover, it is understood that the production of insoluble compounds from metal salts tends to improve coagulation/flocculation by enhancing particles' availability in the suspension, increasing reaction kinetics leading to floc aggregation (Heiderscheidt et al 2020;Sun et al 2019).…”

Section: Discussionmentioning

confidence: 99%

Blend of natural coagulants as a sustainable solution for challenges of pollution from aquaculture wastewater

et al. 2022

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Dependency on sea food has increased owing to its nutrition as well as being complete food. As the production of seafood is enhanced through aquaculture, wastewater release has also improved. The composition of wastewater from aquaculture production has been a concern as it has oil and grease, organic content, etc., which makes its treatment challenging. The present study aims at treating aquaculture wastewater using two natural coagulants—chitin and seeds of Moringa oleifera. The efficiency of the natural coagulants was compared against inorganic chemical coagulant ferric chloride. A blended coagulant with two natural coagulants seeds of Moringa oleifera and chitin was also tested. Jar test apparatus was used in the current experiments, and four coagulant doses were tested against 3 pH ranges, from 6 to 8. The study results showed that the coagulants showed a 30–50% reduction in various physicochemical parameters. Further, the most promising result was obtained with the blended coagulants (di-blend) with 70–81% removal of total nitrogen and total phosphorus and the highest reduction of chloride with 95%. The Fourier-transform infrared spectroscopy showed functionalized groups responsible for coagulation, and X-ray powder diffraction analysis of the blended coagulant indicated the crystallinity and amorphous nature of the compounds. Scanning electron microscope analysis presented a firm and dense structure indicating adsorption of impurities onto the coagulant. Thus, it is evident that natural coagulants can be the solution for the challenges of aquaculture wastewater and specifically the di-blend used in the present is ascertained to be a promising solution.

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“…Five coagulants were selected for testing, based on the literature (e.g. Ebeling et al, 2004Ebeling et al, , 2005Rishel and Ebeling, 2006;Guerdat et al, 2013), previous studies by our research group (Heiderscheidt et al, 2016) and commercial availability. In Phase 2, the effect of chemical treatment process parameters on performance of the best-performing organic and inorganic coagulants from phase 1 was investigated.…”

Section: Methodsmentioning

confidence: 99%

“…The selected response variables were the residual concentrations of PO4-P, SS and turbidity in the treated samples. The magnitude and direction of the factor effects and their interactions were determined using an orthogonal contrast approach (Montgomery, 2006;Heiderscheidt et al, 2016).…”

Section: Phase 2: Effect Of Process Parametersmentioning

confidence: 99%

“…Use of synthetic (Rishel and Ebeling, 2006;Guerdat;2013) and (semi)-natural (Rishel and Ebeling, 2006) organic polymers in RAS has been investigated in a few studies, mostly as a flocculant aid (aiming at improving particle aggregation) added together with a metal salt coagulant. In municipal water and wastewater treatment, organic coagulants (synthetic and natural) have been found to require lower doses than metal salt coagulants and to produce less sludge with better dewatering characteristics (Heiderscheidt et al, 2016;Hameed et al, 2018;Xue et al, 2019). Moreover, natural organic polymers (produced or extracted from animal or plant tissues or microorganisms) have additional benefits such as non-toxicity and high biodegradability (Oladoja, 2015;Xue et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Solids management in freshwater-recirculating aquaculture systems: Effectivity of inorganic and organic coagulants and the impact of operating parameters

Heiderscheidt

Tesfamariam

Pulkkinen

et al. 2020

Science of The Total Environment

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Evaluating the suitability of synthetic organic polymers to replace iron salts in the purification of humic and sediment-rich runoff

Cited by 6 publications

References 35 publications

Coagulation of humic waters for diffused pollution control and the influence of coagulant type on DOC fractions removed

Coagulation of humic waters for diffused pollution control and the influence of coagulant type on DOC fractions removed

Blend of natural coagulants as a sustainable solution for challenges of pollution from aquaculture wastewater

Solids management in freshwater-recirculating aquaculture systems: Effectivity of inorganic and organic coagulants and the impact of operating parameters

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