ALLODUST augmented activated sludge single batch anaerobic reactor (AS-SBAnR) for high concentration nitrate removal from agricultural wastewater

Mohajeri, Parsa; Smith, Carol; Chau, Henry Wai; Lehto, Niklas J.

doi:10.1016/j.scitotenv.2020.141905

Cited by 10 publications

(6 citation statements)

References 57 publications

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“…Nitrate contamination may be found in wastewater generated from electroplating industries and agricultural fields, which can lead to surface water eutrophication, aquatic ecosystem devastation, and increased health threats. [257,258] Microorganisms in the gastrointestinal tract, for example, can reduce nitrate to nitrite, resulting in stomach cancer and methemoglobin, often known as Blue Baby Syndrome. [259] Although biological nitrification/denitrification processes are widely employed in the wastewater treatment industry, they have several major shortcomings.…”

Section: No3rrmentioning

confidence: 99%

Single Atom Environmental Catalysis: Influence of Supports and Coordination Environments

Xu,

Liu,

Liu

2023

Adv Funct Materials

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Single‐atom catalysts (SACs) are desirable in environmental catalysis due to environmental friendliness, structural stability, and maximum utilization of active metal sites. Extensive research has compared the catalytic performance between SACs with different single‐atom metals. However, their catalytic performance is also highly dependent on the supports, which play an important role in modulating the local coordination environment of SACs. Unfortunately, a comprehensive review that systematically discusses the relationship between supports and the coordination environment, as well as their combined effects on environmental catalysis is scare. In this review, three widely investigated environmental applications including advanced oxidation processes (AOPs), mainly Fenton and Fenton‐like reactions, and nitrate reduction reaction (NO3RR) are focused. By correlating characterization results, catalytic performances, and computational results, the combined effects of supports and coordination environments on the catalytic reactivity of SACs are examined in detail, from which the origin of the catalytic pathways of AOPs as well as NO3RR is attempted to reveal. Finally a look forward for potential opportunities and challenges of SACs for on‐demand environmental applications, is provided.

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Section: No3rrmentioning

confidence: 99%

Single Atom Environmental Catalysis: Influence of Supports and Coordination Environments

Xu,

Liu,

Liu

2023

Adv Funct Materials

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“…shown that high concentration NO3and generated NO2can harm human health (e.g., causing blue baby syndrome in infants) and animals as well as eutrophication of real water bodies (Archna et al 2012;Mohajeri et al 2021). Besides, the generation of harmful intermediate products (e.g., benzoquinone and nitrobenzene derivatives) and possible enhanced acute toxicity results should be taken into consideration.…”

Section: Acute Toxicity and Effect Of Actual Waters Componentsmentioning

confidence: 99%

“…Bisphenol A(BPA), as an important endocrine disruptor possessed estrogenic activity, is a high-volume chemical and a widespread plasticizer (Gore et al 2019;Kahn et al 2020). Food and drinking water could be contaminated through migration after BPA is released from chemical products (Newbold et al 2007). Although the BPA concentration detected in surface water and sediments are low (i.e., nd~30ng/L in surface water, 5.3~6.1 ng/g dry weight in sediments, respectively), a great danger to biological health can be presented by it (Hu et al 2019;Welshons et al 2006).…”

Section: Introductionmentioning

confidence: 99%

UV Light Combined with Nitrate Remove Bisphenol A: Kinetics, Transformation Pathways, and Acute Toxicity Assessment

Luo

Tan

et al. 2021

Preprint

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As a powerful endocrine disruptor, bisphenol A (BPA) is a serious threat to human health. In this study, low-pressure UV lamp (LP-UV) photolysis nitrate was used to degrade BPA in different aqueous solutions. Results showed that BPA could be decomposed efficiently in the UV/nitrate process. ·OH played a significant role in the UV/nitrate process, and the steady-state concentration of ·OH ([·OH]ss) was calculated to be 5.26×10-15 M under control conditions. Moreover, the contributions of UV irradiation (4.1%), ·OH (52.7%), and reactive nitrogen species (43.2%) were obtained. The observed rate constant of BPA degradation (kobs) increased with nitrate concentration since more activity species were generated in high nitrate concentration. BPA degradation rate significantly accelerated as the pH value rose, it was ascribed to the increase of the molar absorption coefficient and the portion of ionic BPA. However, kobs declined with increasing BPA concentration result from the inner filter effect and the competition of more generated intermediate products. The increasing decomposition of BPA with the addition of HCO3-/CO32- (0~10 mM), which could be explained as HCO3-/CO32- scavenged ·OH resulting in the accumulation of ·NO2. The effect of Cl- (0~20 mM) can be ignored, which suggested reactive chlorine radicals degraded BPA effectively. The kobs reduced acutely when NOM (0~5mg-C/L) existed in the solution, this could be ascribed to the dual role of NOM inner filter effect and reactive radicals scavenging effect. Further, several degradation products were detected and possible transformation pathways were put forward. Remarkably, the acute toxicity of BPA was slightly enhanced then decayed in the UV/nitrate process.

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“…− and NH 4 + bear a negative impact on aquatic environments, such as eutrophication and the occurrence of algal blooms [3]. Therefore, advanced treatment methods are required to reduce the TN content of sewage.…”

Section: Introductionmentioning

confidence: 99%

“…In sewage wastewater, TN is mainly composed of NO 3 − , with a small amount of NH 3 /NH 4 + [ 2 ]. It has been well established that NO 3 − and NH 4 + bear a negative impact on aquatic environments, such as eutrophication and the occurrence of algal blooms [ 3 ]. Therefore, advanced treatment methods are required to reduce the TN content of sewage.…”

Section: Introductionmentioning

confidence: 99%

Removal of Ammonia Using Persulfate during the Nitrate Electro-Reduction Process

Yang

You

et al. 2022

IJERPH

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NH4+ is often produced during the electro-reduction of NO3−, which results in inadequate total nitrogen (TN) removal during advanced sewage treatment. In this study, the electro-reduction byproduct NH4+ was oxidized and removed using sulfate radical (SO4•−)-based advanced oxidation. Persulfate (PS) was activated by electrocatalysis, using Co/AC0.9-AB0.1 particle electrodes to produce SO4•−. Results showed that when the influent concentration of NO3−-N was 20 mg/L, a PS dosage of 5.0 mM could completely oxidize NH4+ at 0.1 A (nondetectable in effluent) reducing the TN concentration from 9.22 to 0.55 mg/L. The presence of coexisting PO43−, CO32− and humic acid suppressed the oxidation and removal of NH4+. Electron spin resonance (ESR) spectra and quenching experiments revealed SO4•− as the dominant radical in the process of indirect NH4+ oxidation, while •OH radicals only had an assisting role, and the surface accumulated free radicals were responsible for the indirect oxidation of NH4+. Cyclic voltammetry (CV) curves indicated that NO3− was primarily reduced via atomic H*-mediated indirect reduction. Therefore, the activation of PS using Co/AC0.9-AB0.1 particle electrodes might be a promising alternative method for oxidizing byproduct NH4+ in the electro-reduction of NO3− and reduce TN concentration in advanced sewage treatment.

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ALLODUST augmented activated sludge single batch anaerobic reactor (AS-SBAnR) for high concentration nitrate removal from agricultural wastewater

Cited by 10 publications

References 57 publications

Single Atom Environmental Catalysis: Influence of Supports and Coordination Environments

Single Atom Environmental Catalysis: Influence of Supports and Coordination Environments

UV Light Combined with Nitrate Remove Bisphenol A: Kinetics, Transformation Pathways, and Acute Toxicity Assessment

Removal of Ammonia Using Persulfate during the Nitrate Electro-Reduction Process

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