Mechanism of zero valent iron and anaerobic mesophilic digestion combined with hydrogen peroxide pretreatment to enhance sludge dewaterability: Relationship between soluble EPS and rheological behavior

Chemosphere ◽  
2020 ◽  
Vol 247 ◽  
pp. 125859 ◽  
Author(s):  
Jialin Liang ◽  
Siwei Zhang ◽  
Jinjia Huang ◽  
Maoyou Ye ◽  
Xian Yang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Rheological Behavior ◽  
Zero Valent Iron ◽  
Mesophilic Digestion ◽  
Sludge Dewaterability

scholarly journals Heterogeneous Fenton-Like Catalytic Degradation of 2,4-Dichlorophenoxyacetic Acid by Nano-Scale Zero-Valent Iron Assembled on Magnetite Nanoparticles

Water ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2909 ◽  
Author(s):  
Xiaofan Lv ◽  
Yiyang Ma ◽  
Yangyang Li ◽  
Qi Yang
Keyword(s):  
Hydrogen Peroxide ◽  
Synergistic Effects ◽  
Degradation Process ◽  
Zero Valent Iron ◽  
Dichlorophenoxyacetic Acid ◽  
Heterogeneous Fenton ◽  
Reaction Conditions ◽  
Nano Zero Valent Iron ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Better Than

Fe0@Fe3O4 nanoparticles with dispersibility and stability better than single nano zero-valent iron (nZVI) were synthesized and combined with hydrogen peroxide to constitute a heterogeneous Fenton-like system, which was creatively applied in the degradation of 2,4-dichlorophenoxyacetic acid (2,4-D). The effects of different reaction conditions like pH, hydrogen peroxide concentration, temperature, and catalyst dosage on the removal of 2,4-D were evaluated. The target pollutant was completely removed in 90min; nearly 66% of them could be mineralized, and the main intermediate product was 2,4-dichlorophenol. Synergistic effects between nZVI and Fe3O4 made the 2,4-D degradation efficiency in the Fe0@Fe3O4/H2O2 system greater than in either of them alone. More than a supporter, Fe3O4 could facilitate the degradation process by releasing ferrous and ferric ions from the inner structure. The reduction of 2,4-D was mainly attributed to hydroxyl radicals including surface-bound ∙OH and free ∙OH in solution and was dominated by the former. The possible mechanism of this Fe0@Fe3O4 activated Fenton-like system was proposed.

Phenol degradation using hydroxyl radicals generated from zero-valent iron and hydrogen peroxide

2006 ◽  
Vol 63 (1-2) ◽  
pp. 15-19 ◽  
Author(s):  
David H. Bremner ◽  
Arthur E. Burgess ◽  
Didier Houllemare ◽  
Kyu-Cheol Namkung
Keyword(s):  
Hydrogen Peroxide ◽  
Hydroxyl Radicals ◽  
Phenol Degradation ◽  
Zero Valent Iron

scholarly journals Hydrogen Peroxide/Zero Valent Iron/Persulfate Approach for Dye Degradation: Key Operating Parameter and Synergistic Effect

2021 ◽  
Author(s):  
Mehdi Ahmadi ◽  
rozhan feizi
Keyword(s):  
Hydrogen Peroxide ◽  
Dye Degradation ◽  
Operating Parameter ◽  
Zero Valent Iron ◽  
Reusable Catalyst ◽  
Aqueous Environment ◽  
Order Kinetic ◽  
Operational Parameters ◽  
Sunset Yellow ◽  
Solution Ph

Abstract Azo dyes due to the presence of benzene ring, toxicity, mutagenicity, carcinogenicity and low biodegradability have become a major problem in the aqueous environment. In this study, Zero Valent Iron (ZVI) was employed as a catalyst to activate persulfate (PS) and hydrogen peroxide (H2O2) for removal of Sunset Yellow (SY) from aqueous solutions using integrated H2O2/ZVI/PS process. The effects of operational parameters (solution pH, H2O2 concentration, PS concentration, and ZVI dose) were studied on SY removal. According to the results, about 100% efficiency was obtained by the H2O2/ZVI/PS for dye removal at: pH = 3, ZVI 50 mg/L, 1 mM H2O2 concentration, 1 mM PS concentration, and 30 min reaction time. The kinetic study implied that the H2O2/ZVI/PS process followed the first-order kinetic model. The total organic carbon (TOC) test showed that about 65% of mineralization was achieved after 30 min. Moreover, the ZVI particles showed a suitable efficiency after five cycles, and hence, it can be used as an eco-friendly, cost effective and reusable catalyst for the treatment of wastewaters contaminated with such dyes.

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