Related references
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Guijiao Zhang et al.
Summary: This study proposes a novel combined dosing strategy using nitrate and calcium peroxide (CaO2) for the control of sulfide and greenhouse gases in sewer systems. The results show that the combination of nitrate and CaO2 significantly improves sulfide control and reduces greenhouse gas emissions.
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Summary: This study presents an alternative solution to reduce sulfide and methane production in sewer sediments by integrating urine source separation, rapid storage, and intermittent dosing into a sewer. The experimental results showed that the proposed urine dosing effectively reduced sulfide and methane production, and also had economic and environmental advantages compared to conventional chemical methods.
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Yufen Wang et al.
Summary: This review comprehensively outlines the recent studies and applications of potassium permanganate (KMnO4) in wastewater and sludge treatment. It summarizes the methods of enhancing KMnO4 oxidation and discusses its applications and relevant mechanisms in improving contaminants removal, sludge dewatering, and resource recovery.
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(2023)
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Haixiao Guo et al.
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CHEMICAL ENGINEERING JOURNAL
(2023)
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Anqi Wang et al.
Summary: Chemical sulfidation is effective in improving the reactivity of zero-valent iron (S-ZVI). Inspired by the biogeochemical process of sulfidation in nature, researchers explored the biogenetic sulfidation of ZVI (BS-ZVI) using sulfate-reducing bacteria (SRB). BS-ZVI showed a degradation rate of 96.3% for trichloroethylene (TCE), comparable to S-ZVI (97.0%), but with a slower degradation rate due to extracellular polymeric substances (EPS) excreted by SRB. Organic components of EPS, including polysaccharides, humic acid-like substances, and proteins, were detected in BS-ZVI. The acetylation degree of EPS increased with ZVI and S/Fe concentration, inhibiting TCE degradation. Overall, this study demonstrated the potential of biogenetic sulfidation as an alternative method for improving the reactivity of ZVI.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
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Min Zheng et al.
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Yanying He et al.
Summary: This paper comprehensively reviews the status of greenhouse gas (GHG) production and emission in wastewater treatment. It reveals that nitrous oxide (N2O) emission contributes significantly to the total GHG emissions, and emphasizes the importance of dissolved N2O and methane (CH4) in effluent for further GHG mitigation. Alternative integration systems, such as coupling denitrifying anaerobic methane oxidation with anammox process, are discussed as promising approaches for GHG mitigation. Moreover, strategies to manage N2O and CH4 as energy sources are demonstrated for offsetting carbon footprint in wastewater treatment and achieving net-zero GHG emission.
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Qianqian Wen et al.
Summary: This study evaluated the performance of sludge dewatering with different conditioners and detected the stress of the dewatered filtrate on the microbes using microbial fuel cells (MFCs). Dewatered filtrates from Fe2+/H2O2 and Fe2+/Ca(ClO)2 conditioning were recommended, with voltage inhibition ratios of only 24.28% and 31.58% when the MFC substrate was 100% filtrate. However, voltage inhibition ratios reached 70.33% and 90.33% when the MFC substrates were 50% filtrate from Fe2+/PDS and Fe3+/CaO conditioning. The high pH (>12) of the Fe3+/ CaO conditioning filtrate and the remaining oxidation reagent in the Fe2+/PDS conditioning filtrate significantly increased damaged cell ratios at anodic biofilms, indicating negative impacts on microbial activity. This study provides a reference for the impact of dewatered filtrate on wastewater treatment plants (WWTPs).
Article
Engineering, Environmental
Guijiao Zhang et al.
Summary: The combination of nitrate and sodium nitroprusside (SNP) was found to be highly synergistic for sulfide control in sewer systems, reducing chemical costs by approximately 35% and minimizing loss of organic carbon source. Nitrate combined with SNP could effectively promote the activity of autotrophic, nitrate reducing-sulfide oxidizing bacteria while reducing the abundance of heterotrophic, nitrate-reducing bacteria. This strategy also promoted the dissimilatory nitrate reduction process, utilizing sulfide as an effective electron donor.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
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Yue He et al.
Summary: A laboratory-scale sulfur autotrophic reactor (SAR) was constructed and demonstrated to have excellent bioreduction efficiency for tellurite [Te(IV)] wastewater. The study investigated the mechanism of Te(IV) bioreduction through various factors including extracellular polymeric substances (EPS) functions, microbial metabolic activity, key enzyme activity, microbial community succession and quorum sensing. The results provided insights into the Te(IV) bioreduction mechanism and suggested a promising strategy for Te(IV) wastewater treatment.
Article
Agricultural Engineering
Baoyong Zhang et al.
Summary: This study investigated the effect of nitrogen-doped graphene (N-G) on anammox microbial guild through metagenomics. The results showed that adding N-G significantly improved the nitrogen removal efficiency and promoted the growth of dominant anammox bacteria. Metagenomic analysis revealed that N-G enriched the abundance of genes involved in nitrogen metabolism and also upregulated genes related to microbial functionality and sludge settleability. This study provides a novel perspective for the enrichment of anammox biomass and has practical implications for anammox engineering applications.
BIORESOURCE TECHNOLOGY
(2022)
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Zigeng Zhang et al.
Summary: This study explores the molecular mechanism of biopolymer enhancing anti-erosion by using the environmentally-friendly oxidant potassium ferrate (PF) to treat sediments. The results show that PF treatment improves sediment erosion capability and weakens adhesion, thereby enhancing the anti-erosion properties of sediments.
CHEMICAL ENGINEERING JOURNAL
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Shihai Deng et al.
Summary: The accumulation of nitrous oxide (N2O) and nitrite (NO2-) in iron-driven autotrophic denitrification (ADN) processes remains unclear. This research systematically characterized the N2O/NO2- accumulation in Fe(0)-/Fe(II)-ADN processes through investigating the mechanisms, impact factors, and molecular biological characteristics.
CHEMICAL ENGINEERING JOURNAL
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Haixiao Guo et al.
Summary: This study explores a new pretreatment strategy using beta-CD to enhance methane production and improve dewaterability of waste activated sludge in two-phase anaerobic digestion. Results show that beta-CD significantly increases methane yield and improves the solubilization and acidification processes of the sludge, as well as methane fermentation.
JOURNAL OF CLEANER PRODUCTION
(2022)
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Daheng Ren et al.
Summary: This study proposes a novel physical control approach called intermittent surface sediment flushing to address multiple issues caused by sewer sediments. The results show that flushing the surface sediments immediately reduces sulfide and methane production, and it takes about a week for the activities to recover to 50% of the maximum. Compared to chemical dosing methods, this approach greatly reduces operating costs and environmental impact.
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Engineering, Environmental
Lili Tian et al.
Summary: This study demonstrated the feasibility of recycling magnetite nanoparticles (MNPs) produced from Fe-rich sludge under anaerobic conditions using indigenous microorganisms. The biosynthesized MNPs showed similar catalytic performance to commercialized MNPs, but with high reusability after multiple cycles.
RESOURCES CONSERVATION AND RECYCLING
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Kyohei Kuroda et al.
Summary: This study investigated the performance of an upflow anaerobic sludge blanket reactor in the co-treatment of high organic loading PTA and DMT wastewaters. Microbiome analysis revealed the microbial interactions and metabolic functions within the reactor. The findings provide insights into the degradation pathways of aromatic compounds in the complex wastewaters.
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Yue Lu et al.
Summary: This study demonstrated that pretreatment with ferric chloride (FC) and nitrite increased the production of short-chain fatty acids (SCFAs) from waste activated sludge (WAS). The combined system with 4 mmol/L FC and 250 mg/L nitrite achieved the highest SCFAs production on day 5, which was 4.1-fold higher than the blank control. The proportion of acetic acid in the combined system was higher, while other SCFAs were lower, indicating the effectiveness of the treatment. Fluorescence spectrum analysis and microbial community structure analysis supported these findings.
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Mei Tang et al.
Summary: The stress responses of sulfate-reducing bacteria (SRB) sludge to polyethylene (PE) microplastic exposure were studied. Low levels of PE microplastics had limited effect on SRB consortia, whereas higher levels imposed physiological stresses. However, the overall reactor performance was less affected. Additionally, SRB consortia promoted the production of extracellular polymeric substances in response to higher concentrations of PE microplastics, providing protective effects.
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Qizi Fu et al.
Summary: This study found that Rhamnolipid (RL) promotes the generation of hydrogen sulfide (H2S) in anaerobic fermentation of waste activated sludge (WAS) by reducing surface tension, altering the structure of sulfotransferases, and increasing the expression of key genes involved in dissimilatory sulfate reduction.
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Wenbo Yu et al.
Summary: This study proposes an optimal integrated strategy for recovery and carbon sink in anaerobically digested sludge management by considering low-valued recyclables recycling and non-recyclables reduction. Acid-elutriation effectively reduces the water content and volume of the sludge, improves its stability, and enhances the quality by removing metals. The study suggests potential opportunities for combining acid-elutriation with other treatment technologies to achieve enhanced dewatering performance.
RESOURCES CONSERVATION AND RECYCLING
(2022)
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Agricultural Engineering
Zhiqiang Huang et al.
Summary: This study investigated the enhancement of anaerobic digestion of phenol in high salinity wastewater using granular activated carbon (GAC) and exogenous hydrogen (H2). The results showed that the GAC/H2 group had significantly increased methane production, coenzyme F420 concentration, and interspecies electron transfer system activity compared to the control group. Additionally, the relative abundance of syntrophic acetate-oxidizing bacteria and methanogens was significantly higher in the GAC/H2 group.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Wei Lin et al.
Summary: This study explores the application of sodium chloride for sludge dewatering and compares its effects with calcium chloride and ferric chloride. Results show that sodium chloride can significantly improve the dewaterability of sludge by disrupting the structure of EPS and reducing its hydrophilicity and water-holding capacity.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Xiaochen Liu et al.
Summary: The removal behavior of organic pollutants, such as lignin, in cotton pulp black liquor was investigated using precipitation followed by electrochemical oxidation (EO) with different iron salts as the precipitants, electrolyte, and catalysts. FeCl3 showed the highest removal efficiency, and the complexation of iron cations with lignin was identified as the main mechanism in the precipitation process. Molecular dynamics simulations provided insight into the formation of complexes between iron cations and lignin. The combined process of precipitation and EO using FeCl3 showed significant advantages in removing organic pollutants from cotton pulp black liquor.
Article
Engineering, Environmental
Mariella Chislett et al.
Summary: This study evaluated the chemical interactions and reaction mechanisms between FNA and molecules representative of key EPS in biofilm and sludge flocs, demonstrating that FNA can break down large EPS molecules into smaller ones. Two potential mechanisms have been proposed, including electrophilic substitution and oxidative radical reactions. Larger, more complex organic molecules required higher FNA concentrations for breakdown compared to smaller molecules.
Article
Engineering, Environmental
Angelica Guerrero Calderon et al.
Summary: The study introduced a new pretreatment method using ferric chloride and nitrite to enhance anaerobic digestion of thickened waste activated sludge, resulting in improved degradability, methane yield, digestate disposal, and phosphorus recovery. The dosing of FeCl3 reduced the pH of the sludge and led to the formation of free nitrous acid, which significantly increased methane production and reduced polymer requirements for further digestate dewatering. Additionally, the dosed Fe(III) precipitated sulfide and phosphorus, decreasing hydrogen sulfide concentration in biogas and increasing vivianite content in digested sludge.
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Engineering, Environmental
Zhetai Hu et al.
Summary: A new approach of dosing FeCl3 into returned sludge was proposed to achieve nitrogen removal via the nitrite pathway and reduce biomass production. By increasing iron concentration, sludge acidification and nitrite accumulation were induced, leading to enhanced sludge treatment efficiency.
Article
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Feixiang Zan et al.
Summary: This study revealed that diverting food waste into sulfate-laden sewer can significantly influence the production of methane and sulfide in sewers. The addition of food waste was found to enhance both sulfide and methane production, but the impact on methane production was more significant than on sulfide production. Sulfate concentration and food waste-to-sewage ratios were found to play a crucial role in microbial electron utilization for sulfide and methane production. These findings suggest that diverting food waste into sulfate-laden sewer may have negative impacts on sewer management and the environment.
Article
Environmental Sciences
Wei Wei et al.
Summary: The study found that CuO nanoparticles can significantly enhance hydrogen production from waste-activated sludge at environmentally relevant concentrations, while having little impact at higher concentrations. The toxicity of CuO nanoparticles is primarily mediated by oxidative stress induced by reactive oxygen species.
Review
Engineering, Environmental
Tove A. Larsen et al.
Summary: Over the last 15 years, urine treatment technologies have evolved from lab studies to a promising innovation, attracting interest from process engineers. Biological processes are favored for urine stabilization, while physical-chemical treatment technologies show potential at bathroom scale.
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