Treatment of Arctic wastewater by chemical coagulation, UV and peracetic acid disinfection

Chhetri, Ravi Kumar; Klupsch, Ewa; Andersen, Henrik Rasmus; Jensen, Pernille Erland

doi:10.1007/s11356-017-8585-5

Cited by 15 publications

(10 citation statements)

References 23 publications

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“…The mean reduction values of the faecal indicators at specific PAA doses are reported in Figure 1. During the monitoring, high concentrations [2,28] of faecal coliforms and E. coli, as well as enterococci and C. perfringens were observed in raw sewage ( Table 4). The concentrations of the four bacterial indicators were similar in the summer, autumn, and spring (range: 2.91 to 4.42 log MPN/100 mL or CFU/100 mL), whereas a major contamination was observed during the winter (range: 4.21 to 5.74 log CFU-MPN/100 mL or CFU/100 mL).…”

Section: Salmonella E Coli O157:h7 Campylobactermentioning

confidence: 99%

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Peracetic Acid (PAA) Disinfection: Inactivation of Microbial Indicators and Pathogenic Bacteria in a Municipal Wastewater Plant

Bonetta¹,

Pignata²,

Lorenzi

et al. 2017

Water

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Abstract:Several studies have noted that treated and untreated wastewaters are primary contributors of a variety of pathogenic microorganisms to the aquatic ecosystem. Conventional wastewater treatment may not be sufficient to achieve microbiologically safe effluent to be discharged into natural waters or reused, thus requiring wastewater effluents to be disinfected. In recent years, peracetic acid (PAA) has been adopted as a disinfectant for wastewater effluents. The aim of this study was to evaluate the disinfection efficiency of PAA at low doses (range 0.99-2.10 mg/L) against microbial indicators and pathogenic bacteria in a municipal wastewater plant. Samples of untreated sewage and effluents before and after PAA treatment were collected seasonally for 1 year and were analysed for pathogenic Campylobacter, Salmonella spp., E. coli O157:H7 and E. coli virulence genes using molecular methods; moreover, the detection of specific microbial indicators (E. coli, faecal coliforms, enterococci, C. perfringens) and Salmonella spp. were carried out using culturing methods. Salmonella spp. DNA was found in all untreated sewage and effluent before PAA treatment, whereas it was recovered in 50% of the samples collected after PAA treatment. Although E. coli O157:H7 was never identified, the occurrence of Shiga-like toxin I amplicons was identified in 75% of the untreated sewage samples, in 50% of the effluents assayed before PAA treatment, and in 25% of the effluents assayed after PAA treatment, whereas the stx2 gene was never found. Campylobacter coli was only detected in one effluent sample before PAA treatment. In the effluents after PAA treatment, a lower load of indicator bacteria was observed compared to the effluents before treatment. The results of this study highlight that the use of low doses of PAA seems to lead to an improvement of the microbiological quality of the effluent, although it is not sufficient to guarantee its suitability for irrigation. These results underscore the need for additional studies to further assess the efficiency of PAA disinfection in municipal wastewater plants.

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Section: Salmonella E Coli O157:h7 Campylobactermentioning

confidence: 99%

“…Several studies have noted that treated and untreated wastewaters are primary contributors of a variety of pathogenic microorganisms, pollutants, and chemicals to the aquatic ecosystem [1,2]. Numerous studies have indicated that primary and secondary wastewater treatment typically achieves 90-99% reductions of enteric microbial numbers.…”

Section: Introductionmentioning

confidence: 99%

Peracetic Acid (PAA) Disinfection: Inactivation of Microbial Indicators and Pathogenic Bacteria in a Municipal Wastewater Plant

Bonetta¹,

Pignata²,

Lorenzi

et al. 2017

Water

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“…For this reason, an additional conclusive step of effluent disinfection must generally be performed [4,5]. An ideal disinfectant for this step should efficiently remove the pathogenic microorganism's maximum, avoiding the neoproduction of dangerous and undesirable by-products, and should be inexpensive and technologically compatible [6]. The chlorination is the most widely used method for the disinfection of wastewater, because it showed high effectiveness and low residual effect and cost [7].…”

Section: Introductionmentioning

confidence: 99%

Comparison of UV, Peracetic Acid and Sodium Hypochlorite Treatment in the Disinfection of Urban Wastewater

et al. 2021

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One source of water contamination is the release of wastewater that has not undergone efficient treatment. The aim of this study was to evaluate the reduction obtained with sodium hypochlorite (NaClO), UV and peracetic acid disinfection treatment of Salmonella spp., pathogenic Campylobacter, STEC and bacterial indicators in three full-scale municipal wastewater plants. A general reduction in Salmonella was observed after disinfection, but these bacteria were detected in one UV-treated sample (culture method) and in 33%, 50% and 17% of samples collected after NaClO, UV and PAA disinfection treatments, respectively (PCR method). A better reduction was also observed under NaClO disinfection for the microbial indicators. Independent of the disinfection treatment, E. coli O157:H7 was not detected in the disinfected samples, whereas some samples treated with UV and PAA showed the presence of the stx1 gene. No reduction in the presence of stx2 genes was verified for any of the disinfection treatments. Campylobacter was not detected in any of the analysed samples. The overall results highlight a better reduction in microbiological parameters with a NaClO disinfection treatment in a full-scale municipal wastewater plant compared with UV and PAA. However, the results indicate that a complete and specific monitoring program is necessary to prevent a possible risk to public health.

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“…Research has shown that the phosphate can replace part of the hydroxyl that combines with Fe 3+ . The formation of an alkali-type iron phosphate compound complex can change the hydrolysis paths of Fe 3+ (An et al 2019;Chhetri et al 2018). Iron hydroxide gels and various types of iron oxide could form binuclear complexes after adsorbing a mass of phosphate, which suggests that PO 4 3− can replace two adjacent OH − functional groups and form a bridge between the two Fe 3+ ions.…”

Section: Introductionmentioning

confidence: 99%

Application of chemical coagulation to phosphorus removal from glyphosate wastewater

Liu

Zhou

2021

Int. J. Environ. Sci. Technol.

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Glyphosate, the most widely used herbicide in the world, is routinely applied to control weeds in both agricultural and urban settings. Glyphosate wastewater that has been treated with Fenton's reagent has a high phosphorus content and has the potential to cause environmental pollution. However, the high phosphorus concentration means that it may be possible to recover phosphorus from the glyphosate-rich wastewater. To date there have been relatively few studies on phosphorus removal from glyphosate wastewater. We therefore carried out a pilot scale study to investigate phosphorus recovery from this wastewater using chemical coagulation and evaluated the effect of various parameters, such as the initial pH, reaction time, coagulant dosage and type of coagulant. The experimental results demonstrate that a total phosphorus removal efficiency of about 68% was achieved for glycine wastewater and that total phosphorus removal efficiencies from N-(Phosphonomethyl) iminodiacetic acid wastewater and wastewater containing 6% glyphosate exceeded 90% under optimal reaction conditions.

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Treatment of Arctic wastewater by chemical coagulation, UV and peracetic acid disinfection

Cited by 15 publications

References 23 publications

Peracetic Acid (PAA) Disinfection: Inactivation of Microbial Indicators and Pathogenic Bacteria in a Municipal Wastewater Plant

Peracetic Acid (PAA) Disinfection: Inactivation of Microbial Indicators and Pathogenic Bacteria in a Municipal Wastewater Plant

Comparison of UV, Peracetic Acid and Sodium Hypochlorite Treatment in the Disinfection of Urban Wastewater

Application of chemical coagulation to phosphorus removal from glyphosate wastewater

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