Apparent diffusion coefficients in sewer force main biofilms treated with iron salts

Kiilerich, Bruno; Wagner, Michael; Nielsen, Asbjørn Haaning; Vollertsen, Jes

doi:10.1039/c8ew00258d

Cited by 1 publication

(2 citation statements)

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“…If the flow velocity in a pressure main frequently exceeds 0.8-1 m s −1 , the corresponding biofilm is relatively smooth and thin, typically 100-300 µm (USEPA, 1974). However, high flow velocities also reduce the diffusion layer at the biofilm-water interface and thereby the resistance against transport of substrates and products (Kiilerich et al, 2018a). In total, a high flow velocity will normallyconsidering constant residence timereduce the potential for sulfide formation in pressure mains.…”

Section: Flow Velocitymentioning

confidence: 99%

“…The reactions are, in practice, complex and dependent on pH, concentrations of iron and sulfide, redox potential and the microbial composition of the wastewater (Kiilerich et al, 2018b;Nielsen et al, 2005aNielsen et al, , 2008. It has furthermore been observed that the use of iron salts may reduce the diffusion of the sewer biofilm (Kiilerich et al, 2018a). In spite of the complex nature of the reaction kinetics, in practice the use of iron salts for sulfide control is rather simple, efficient and relatively cheap.…”

Section: Iron Salt Additionmentioning

confidence: 99%

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Sulfur transformations in sewer networks: effects, prediction and mitigation of impacts

Hvitved-Jacobsen¹

2020

Environmental Technologies to Treat Sulphur Pollution: Principles and Engineering

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Sulfur transformations in sewer networks are predominantly of importance because of the formation and occurrence of hydrogen sulfide. Hydrogen sulfide related to wastewater in sewers is a worldwide problem as it leads to concrete and metal corrosion, odor nuisance and human health impacts. The solution to these problems has its starting point in an understanding of the sewer network as a reactor for physical, chemical and biological sulfur processes that govern the formation of hydrogen sulfide and its control. In this respect, it becomes important to predict the interacting sulfur processes in terms of both simple empirical equations and more advanced models that are based on a conceptual understanding of the sulfur processes, the latter is of particular importance when applied to the complex constructed and functioning sewers of today. Problems related to sewer gases have been known for centuries. However, no more than about 100 years ago, based on sound scientific and technical knowledge, it was recognized that corrosion and odor problems in wastewater collection systems are closely related to anaerobic conditions and a corresponding formation of hydrogen sulfide. In brief, sulfide formation takes place by the activity of anaerobic sulfate-reducing bacteria that are mainly found in sewer biofilms from where sulfide penetrates the wastewater phase (see also Chapter 5). It is the subsequent emission of hydrogen sulfide into the sewer atmosphere that

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Section: Flow Velocitymentioning

confidence: 99%

Section: Iron Salt Additionmentioning

confidence: 99%

Sulfur transformations in sewer networks: effects, prediction and mitigation of impacts

Hvitved-Jacobsen¹

2020

Environmental Technologies to Treat Sulphur Pollution: Principles and Engineering

View full text Add to dashboard Cite

show abstract

Apparent diffusion coefficients in sewer force main biofilms treated with iron salts

Abstract: Iron treatment of wastewater in sewer force mains for sulfide abatement reduces biofilm diffusivity.

Cited by 1 publication

References 39 publications

Sulfur transformations in sewer networks: effects, prediction and mitigation of impacts

Sulfur transformations in sewer networks: effects, prediction and mitigation of impacts

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