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Electrical stress and acid orange 7 synergistically clear the blockage of electron flow in the methanogenesis of low-strength wastewater

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Environmental Science and Ecotechnology 2024年第4期20卷 291-299页

作者： Ze-Chong Guo Min-Hua Cui Chun-Xue Yang Hong-Liang Dai Tong-Yi Yang Lin-Zhi Zhai Yong Chen Wen-Zong Liu Ai-Jie Wang School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang212100China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin150090China Jiangsu Key Laboratory of Anaerobic Biotechnology Jiangnan UniversityWuxi214122China School of Civil and Environmental Engineering Harbin Institute of TechnologyShenzhen518055China School of Geography and Tourism Harbin UniversityHarbin150001China School of Environmental Science and Engineering Huazhong University of Science and TechnologyWuhan430074China

Energy recovery from low-strength wastewater through anaerobic methanogenesis is constrained by limited substrate *** development of efficient methanogenic communities is critical but *** we develop a strategy to acclimate methanogenic communities using conductive carrier(CC),electrical stress(ES),and acid orange 7(AO7)in a modified *** synergistic integration of CC,ES,and AO7 precipitated a remarkable 72-fold surge in methane production rate compared to the *** increase was attributed to an altered methanogenic community function,independent of the continuous presence of AO7 and ***7 acted as an external electron acceptor,accelerating acetogenesis from fermentation intermediates,restructuring the bacterial community,and enriching electroactive bacteria(EAB).Meanwhile,CC and ES orchestrated the assembly of the archaeal community and promoted electrotrophic methanogens,enhancing acetotrophic methanogenesis electron flow via a mechanism distinct from direct electrochemical *** collective application of CC,ES,and AO7 effectively mitigated electron flow impediments in low-strength wastewater methanogenesis,achieving an additional 34%electron recovery from the *** study proposes a new method of amending anaerobic digestion systems with conductive materials to advance wastewater treatment,sustainability,and energy self-sufficiency.

关键词： Methanogenesis Conductive carrier Electrical stress acid orange 7 Electron transfer

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Regeneration of acid orange 7 Exhausted Granular Activated Carbon Using Pulsed Discharge Plasmas

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Plasma Science and Technology 2015年第10期17卷 881-886页

作者：王慧娟郭贺刘永杰依成武 School of the Environment and Safety Engineering Jiangsu University

In this paper, a pulsed discharge plasma （PDP） system with a multi-needle-to-plate electrodes geometry was set up to investigate the regeneration of acid orange 7 （AO7） exhausted granular activated carbon （GAC）. Regeneration of GAC was studied under different conditions of peak pulse discharge voltage and water pH, as well as the modification effect of GAC by the pulse discharge process, to figure out the regeneration efficiency and the change of the GAC structure by the PDP treatment. The obtained results showed that there was an appropriate peak pulse voltage and an optimal initial pH value of the solution for GAC regeneration. Analyses of scanning electron microscope （SEM）, Boehm titration, Brunauer-Emmett-Teller （BET）, Horvath-Kawazoe （HK）, and X-ray Diffraction （XRD） showed that there were more mesopore and macropore in the regenerated GAC and the structure turned smoother with the increase of discharge voltage; the amount of acidic functional groups on the GAC surface increased while the amount of basic functional groups decreased after the regeneration process. From the result of the XRD analysis, there were no new substances produced on the GAC after PDP treatment.

关键词： pulsed discharge plasma acid orange 7 granular activated carbon regeneration pore structure functional groups

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Adsorption of acid orange 7 from aqueous solutions by bottom ash

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Journal of Environmental Science and Engineering 2008年第10期2卷 1-13页

作者： QU Yan-zhi SUN Wei-ling YE Zheng-fang YU Qing NI Jin-ren The Key Laboratory of Water and Sediment Sciences Ministry of Education Department of Environmental Engineering Peking UniversityBeijing 100871China

Bottom ash. a power plant waste, was used to adsorb acid orange 7. The adsorption of acid orange 7 in aqueous solutions onto bottom ash was studied as functions of particle size. dosage, initial concentration and agitation time by batch experiments. Under conditions of bottom ash dosage of 1.5 g/50 ml and 5 g/50 ml for 〈0.074 mm and 0.074 mm-0.2 mm of bottom ash, respectively, it could achieve 99.1% and 87.6% dye removal efficiency. The adsorption isotherms for the bottom ash could be well described by both Freundlich and Langmuir isotherms. The calculated dye adsorption capacities of bottom ash for the particle size of 0.074 mm -0.2 mm and 〈0.074 mm were 2.78 mg/g and 10.21 mg/g, respectively. The results indicated that the dye uptake process fitted to the pseudo-first-order kinetic model better than the pseudo-second-order. The data were also fitted to intraparticle diffusion model by two adsorption stages, due to the difference in rate of mass transfer in the initial and final stages of adsorption. Significant variations were observed in the FTIR spectra and Stem photographs of bottom ash after adsorption. The column parameters were calculated by breakthrough curves at different flow rates and bed depths.

关键词： adsorption bottom ash acid orange 7 asotherm kinctics column operation

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Combination of adsorption and biodegradation processes for textile effluent treatment using a granular activated carbon-biofilm configured packed column system

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Journal of Environmental Sciences 2008年第8期20卷 952-956页

作者： ONG SoonAn TOORISAKA Eiichi HIRATA Makoto HANO Tadashi Department of Applied Chemistry Oita UniversityOita 870-1192Japan.School of Environmental EngineeringUniversity Malaysia PerilsPerlis 02700Malaysia Department of Applied Chemistry Oita UniversityOita 870-1192Japan

The objective of this study was to investigate the feasibility of using a granular activated carbon-biofilm configured packed column system in the deeolodzation of azo dye acid orange 7-containing *** acid orange 7-degrading microbial from anaerobic sequencing batch reactor which treating the azo dye-containing wastewater for more than 200 d was immobilized on spent granular activated carbon(GAC)through *** GAC-biofilm configured packed column system showed the ability to decolorize 10...

关键词： granular activated carbon(GAC) color removal acid orange 7 azo dye immobilization

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Phytoremediation of industrial effluent containing azo dye by model up-flow constructed wetland

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Chinese Chemical Letters 2009年第2期20卷 225-228页

作者： S.A.Ong K.Uchiyama D.Inadama Y.Ishida K.Yamagiwa Graduate School of Science and Technology Niigata UniversityNiigata 950-2181Japan

This study assessed the treatment of azo dye acid orange 7 （AO7） containing wastewater by laboratory-scale up-flow constructed wetland （UFCW） with and without supplementary aeration. The supplementary aeration could effectively control the ratio of anaerobic and aerobic zones in the UFCW reactor. The results clearly show the supplementary aeration boosted the biodegradation of organic pollutants and mineralization of intermediate aromatic amines formed by AO7 degradation.

关键词： Up-flow constructed wetland Supplementary aeration acid orange 7

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