Chemical treatment response to variations in non-point pollution water quality: Results of a factorial design experiment

Heiderscheidt, Elisangela; Leiviskä, Tiina; Kløve, Bjørn

doi:10.1016/j.jenvman.2014.10.021

Cited by 14 publications

(12 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, Tan2 was selected for the next stage of testing together with FS, pDMAC and Chit. The pH of peat extraction runoff water is reported to range between 4.5 and 7.0 (Heiderscheidt et al, 2015). Thus, the pH variations tested (4.5-6.5) reflected real operational conditions.…”

Section: Dosage Required and The Influence Of Ph On The Coagulation Pmentioning

confidence: 86%

“…Sample and sub-samples were stored at 5-10 °C for the 5-week testing period, during which a series of water quality analyses were periodically performed. The water quality characteristics of the collected sample (Table 1) as well as the pH variation applied (4.5-6.5) are typical of peat extraction runoff water (Heiderscheidt et al, 2015), thus the sample is representative of real operational conditions. Water quality analyses were conducted at our in-house laboratory using standard methods: Suspended SS: (1.2 µm filtration), SFS-EN 872:2005; turbidity: EN 27027:1994 (Hatch Ratio/XR Turbidity meter); colour: ISO 7887:1994 (Lovibond Nessleriser Daylight 2000); and pH: SFS-EN 13037:1994 (WTW Universal meter).…”

Section: Characteristics Of the Watermentioning

confidence: 99%

“…5-70 mg/L) typically occur at peat extraction sites where chemical purification is required (Heiderscheidt et al, 2015). It has been found that when particles are present, higher removal of NOM and turbidity can be achieved by metal salts and organic coagulants (Bolto et al, 2001).…”

Section: Overall Considerations Regarding Coagulant Performancementioning

confidence: 99%

“…Finnish environmental authorities oblige the country's peat extraction industry to purify runoff water from extraction sites and consider chemical treatment to be one of the best available technologies for this purpose (Finnish Ministry of the Environment, 2015). Cost-effective application of chemical treatment for diffuse pollution control is challenging due to the need for simple and low-cost facilities (resulting in low process control) and the recognised variations in runoff water quality (pH, dissolved organic carbon (DOC) and suspended solids (SS) concentration), temperature and discharge (Heiderscheidt, et al, 2015). Significant fluctuations in purification efficiency and increased acidity, metal and sulphate concentrations have been observed at Finnish peat extraction sites where ferric sulphate (FS) is applied (Finnish Environmental Institute, 2015).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Dosage Required and The Influence Of Ph On The Coagulation Pmentioning

confidence: 86%

Section: Characteristics Of the Watermentioning

confidence: 99%

Section: Overall Considerations Regarding Coagulant Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Self Cite

View full text Add to dashboard Cite

show abstract

“…Where Y i is the response (Y 1 , Y 2 , Y 3 and Y 4 ), b 0 the constant; b i the linear coefficient; b ij the interaction coefficients and X i is the dimensionless variables (X 1 for temperature, X 2 for the volume of solution and X 3 for PG quantity) [43,44].…”

Section: Full Factorial Designmentioning

confidence: 99%

Phosphogypsum purification for plaster production: A process optimization using full factorial design

Moalla

Gargouri

Khmiri³

et al. 2017

Environmental Engineering Research

View full text Add to dashboard Cite

The phosphogypsum (PG) is a byproduct of the phosphate fertilizers manufacture. The world production estimated to 200 million tons per year induces environmental threats and storage problems, which requires strict policies to limit pollution and encourage its valorization. This paper presents a purification process of the crude PG including treatment with a diluted sulfuric acid, floatation, filtration and washing. The purified PG is used to produce plaster. The process optimization was conducted using a full factorial design. The significant factors considered in the experimental study are temperature (X1), volume of sulfuric acid solution (X2) and PG quantity (X3). The main effects and interaction effects of these factors on the responses of the % P2O5, % F, Total Organic Carbon (TOC) (mg.kg-1) and pH were analyzed. The optimum conditions for X1, X2 and X3 were found to be 60°C, 3 L and 1 kg, respectively and the optimized pH values was found to be 6.2. Under these conditions, 60% of P2O5, 95% of Fluorine and 98% of TOC were removed from PG. The predicted values were found approximately the same as the experimental ones. The plaster produced with purified PG was found to have similar properties to that produced from natural gypsum.

show abstract

Parameter Interactions on the Adsorption Behaviour of Cobalt onto Saline Soil with Different Biosurfactants

Narimannejad,

Cai,

Zhang

et al. 2023

Springer Proceedings in Energy

View full text Add to dashboard Cite

Chemical treatment response to variations in non-point pollution water quality: Results of a factorial design experiment

Cited by 14 publications

References 32 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

Phosphogypsum purification for plaster production: A process optimization using full factorial design

Parameter Interactions on the Adsorption Behaviour of Cobalt onto Saline Soil with Different Biosurfactants

Contact Info

Product

Resources

About