The selenium removal efficiency in the methanogenic reactor also improved after 58 ... as well as future directions for the recovery of selenium nanoparticles from reactor effluents are also ...

Selenium is difficult to remove from groundwater and industrial effluents because selenium is often present in complex polycontaminated mixtures, thus inducing competition issues with other anions.

The discharge of selenium contaminated water into the environment from industrial processes is a topic of regulatory (WHO – 40 μg/L, EU – 10 μg/L), environmental and health concern. The removal of selenium from water is complex, determined by its speciation and often expensive due to the characteristics of the wastewater and the …

Common physicochemical treatment of industrial wastewater is not very efficient regarding the removal of the oxyanion forming elements selenium, molybdenum and antimony. An industrial case is described where effluents from the wet treatment of flue gases from a rotary kiln for the incineration of industrial waste, contain variable amounts of ...

Speciation of selenium in groundwater or in a raw effluents plays an essential role in the effectiveness of treatment methods used for Se removal, especially …

removal of residual mill organics; O A two-stage EBR system each with a 6 -hour HRT to remove the total selenium and other metals; O An anaerobic post-treatment system with a 6-hour HRT to polish the EBR system effluents and remove the residual nutrients prior to discharge; and O A 24-hour holding pond prior to discharge – site specified.

Abstract. Selenium (Se) discharge into the environment is becoming a matter of increasing concern because it induces toxic effects to biota at low concentrations (several micrograms per liter). Industrial activities that include energy generation, metal and oil refining, mining, and agriculture irrigation generate effluents contaminated with ...

Selenium in sour water stripper bottoms appears to be in reduced forms such as selenide (Se2-). The bottoms are discharged to the refinery wastewater treatment system, where some selenium is removed by biological treatment. The remaining selenium gets oxidized to selenite (SeO32-) and selenate (SeO42-). Selenium discharged to receiving waters ...

Selenium (Se) removal from synthetic solutions and from real Flue Gas Desulfurization (FGD) wastewater generated by a coal-fired power plant was studied for …

Abstract and Figures. This book features the reduction and removal of selenium in wastewater via bioremediation. Arranged over five chapters, this book provides information regarding the ...

... Examples of physical treatment are membrane separation technologies such as nanofiltration (NF) and reverse osmosis (RO) (Ali and Shrivastava …

However, for mine effluents having a predominance of selenate (almost 90%), the iron ratio was increased to 2% to reach a final selenium concentration inferior to 0.0005 mg/L. Low temperature (4 ...

ranges applicable to biological selenium treatment effluents, photocataly tic oxidation was able to remove 193 s elenomethionine to <0.01 µg- Se/L and covert it to the less bioavailable selenate ...

sampling stations. Se concentrations in end pit lakes, rock dump springs, and settling pond effluents averaged 19.8, 115, and 42.7 µg/L, respectively, well above the water quality guidelines. Long-term temporal trends for selenium loadings or subsequent selenium concentrations in water bodies influenced by the mines is not currently known.

The current density was the most important parameter for the removal of selenium and higher removal efficiency was achieved within a short time (Hansen et al., 2019). ...

Summary of Selenium Removal Technologies. A summary of treatment technologies that are applicable or may be applicable for selenium removal from wastewater is presented in Table 1. Because of the large number of publications on selenium only a very brief summary for each technology will be discussed in this presentation.

Speciation of selenium in groundwater or in a raw effluents plays an essential role in the effectiveness of treatment methods used for Se removal, especially because selenium is often present at low concentrations, less than 1 mg/L (Fernández-Martínez and Charlet 2009; BRGM 2011; Santos et al. 2015). Most of the current …

Methods for selenium removal from contaminated waters: a review Selenate removal by zero-valent iron. Zero-valent iron has been used to treat wastewater and groundwater contaminated by... Adsorption of selenium species by iron-oxy …

20 Jun. 2022 Removal of Selenium by Reduction to Selenite and Surface Complexation Abstract Selenium is by now a well-known pollutant, present in various coal and hard …

Selenium (Se) is distributed into different environmental compartments by natural and anthropogenic activities, and generally discharged in the form of selenate [ S …

There was competitive adsorption in the process of selenium removal, as the in-situ generated flocs effectively removed 35.6% of humic acid-like (HA-like) substance in FP wastewater after 90 min treatment. The FTIR results showed that HA-like substance mainly contained the protein water hydrogen bond, ...

The efficiencies of selenium removal from wastewater for different periods of EC treatment are presented in Fig. 2. A selenium removal efficiency of 90% was obtained for 360 min of treatment with a current density close to 153 A m −2. The removal efficiencies using the same current density, but 60 and 240 min of EC treatment were 33.3% and 83 ...

Why Must Selenium Be Removed From Wastewater? Selenium is essential for organic life. However, too much of it can cause adverse effects. Selenium is present in various coal and hard-rock mines and some thermal power plant effluents throughout the world. Selenium in wastewater effluent can be a major issue due to the complexity of its removal as well as …

Biological reduction of selenium oxyanions is widely used for selenium removal from wastewater. The process is, however, limited by the availability of a suitable, efficient and low cost electron donor. In this study, selenite and selenate reduction by waste activated sludge using hydrogen as the electron donor was investigated.

8 rowsRemoval of the trace inorganic and organic selenium compounds from the biological treatment ...

The removal of selenium from complex industrial wastewaters such as the FGD effluents by adsorption is a promising process provided efficient pre-treatment steps are deployed. Because of the structural similarity of various chemical species (e.g., sulfate and selenate), ion exchange resins could be easily exhausted, thus limiting their ...

This review explores the most frequently used methods for selenium removal from mining and process wastewaters in order to give an extensive overview of the possibilities to …

This is the first work showing baryte recovery and metal removal from industrial FGD effluents in a one-step process. [1] Staicu et al. (2017) Chemosphere 117, 111-19. [2] ... Research on selenium ...

While existing regulations limit selenium concentrations in water to 50 parts-per-billion, industrial effluents (e.g. flue gas desulfurization, mining wastewater, coal power plants) are often required to achieve levels below 10 parts-per-billion. ... This is the first time that a technology for selenium removal combines novel methods in ...

Selenium removal is becoming increasingly important given the fact that this element is a very common impurity in metallurgical feedstocks and is increasingly regulated. For example copper and zinc refineries generate acidic solution effluents that contain variable amounts of selenium (typically as Se(IV)) ranging from a few to hundreds of …