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Evaluation of activated sludge properties’ changes in industrial-wastewater pre-treatment: role of residual

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 6, doi: 10.1007/s11783-023-1675-3

Abstract:

● Medium poly Al salts dominated the PAC residual salts with a rational dosage.

Keywords： Coagulation/flocculation     Hydroxyl-aluminum     Hydrolysis reaction     Reactor performance     Activated sludgeproperty     Surface properties    

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Aggravation of membrane fouling and methane leakage by a three-phase separator in an external anaerobic ceramic membrane bioreactor

Chao Pang, Chunhua He, Zhenhu Hu, Shoujun Yuan, Wei Wang

Frontiers of Environmental Science & Engineering 2019, Volume 13, Issue 4, doi: 10.1007/s11783-019-1131-6

Abstract:

The existence of three-phase separator did not affect COD removal in the EAnCMBR.

The existence of three-phase separator aggravated methane leakage of EAnCMBR.

The existence of three-phase separator aggravated membrane fouling rate of EAnCMBR.

Start-up of EAnCMBR equipped three-phase separator was slightly delayed.

Keywords： Anaerobic membrane bioreactor     Three-phase separator     Membrane fouling     Methane leakage     Sludge property    

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A computational toolbox for molecular property prediction based on quantum mechanics and quantitativestructure-property relationship

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 2,   Pages 152-167 doi: 10.1007/s11705-021-2060-z

Abstract: During these periods, one of the most important keys is the molecular property prediction models associatingIn this paper, a framework combining quantum mechanics and quantitative structure-property relationshipis established for fast molecular property predictions, such as activity coefficient, and so forth.which are stored in a database and further provided for the developments of quantitative structure-propertyThe whole framework has been carried out within a molecular property prediction toolbox.

Keywords： molecular property     quantum mechanics     quantitative structure-property relationship     heat of reaction    

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Comparison between inhibitor and uncoupler for minimizing excess sludge production of an activated sludge

CHEN Guowei, XI Pengge, XU Deqian, YU Hanqing

Frontiers of Environmental Science & Engineering 2007, Volume 1, Issue 1,   Pages 63-66 doi: 10.1007/s11783-007-0012-6

Abstract: In order to study the minimization of excess sludge production, the reduction in the excess sludge productionThe experimental results show that such an addition could effectively reduce the production of excess sludgeestablished in this work, energy uncoupling coefficient () was used to evaluate the reduction in excess sludgepresence of dNP, and that dNP was an effective uncoupler for reducing the production of excess activated sludge

Keywords： uncoupling coefficient     Cu     minimization     presence     uncoupling    

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Co-pyrolysis of sludge and kaolin/zeolite in a rotary kiln: Analysis of stabilizing heavy metals

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 7, doi: 10.1007/s11783-021-1488-1

Abstract:

• Adding kaolin/zeolite promotes the formation of stable heavy metals.

Keywords： Co-pyrolysis     Sewage sludge     Heavy metals     Rotary kiln     Immobilization mechanism    

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Cultivation of aerobic granular sludge in a conventional, continuous flow, completely mixed activatedsludge system

Xi CHEN,Linjiang YUAN,Wenjuan LU,Yuyou LI,Pei LIU,Kun NIE

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 2,   Pages 324-333 doi: 10.1007/s11783-014-0627-3

Abstract: Aerobic granules were formed in a conventional, continuous flow, completely mixed activated sludge systemThe reactor was inoculated with seed sludge containing few filaments and fed with synthetic municipalThe settling time of the sludge and the average dissolved oxygen (DO) of the reactor were 2 h and 4.2The reactor was agitated by a stirrer, with a speed of 250 r·min , to ensure good mixing．The granular sludgehad good settleability, and the sludge volume index (SVI) was between 50 and 90 mL·g .

Keywords： aerobic granular sludge     completely mixed activated sludge system (CMAS)     continuous flow     shear force     filamentous    

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Control of sludge settleability and nitrogen removal under low dissolved oxygen condition

Zhaoxu PENG, Yongzhen PENG, Zhenbo YU, Xuliang LIU, Xiaoling LI, Randeng WANG

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 6,   Pages 884-891 doi: 10.1007/s11783-012-0408-9

Abstract: Low dissolved oxygen (DO) is an energy-saving condition in activated sludge process.and setting pre-anoxic (anaerobic) phase were effective strategies to induce and inhibit filamentous sludgeAccording to the sludge settleability, LFB could be maintained steadily by adjusting operation patternsFilamentous bacteria content and sludge volume index (SVI) were likely correlated.settleability in spite of the unstable status of activated sludge system.

Keywords： limited filamentous bulking     sequencing batch reactor     sludge settleability     sludge volume index     simultaneous    

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High-solid anaerobic digestion of sewage sludge: achievements and perspectives

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 4, doi: 10.1007/s11783-020-1364-4

Abstract:

• High-solid anaerobic digestion (HS-AD) of sewage sludge (SS) is overviewed

Keywords： High-solid effect     Anaerobic fermentation     Methane production     Biodegradability     Sludge treatment    

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A review on sustainable reuse applications of Fenton sludge during wastewater treatment

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 6, doi: 10.1007/s11783-021-1511-6

Abstract:

• The sustainable approaches related to Fenton sludge reuse systems

Keywords： Fenton sludge     Heavy metals     Coagulant     Iron source     Heterogeneous catalyst    

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Properties and effect of forming sewage sludge into lightweight ceramics

Min YUE, Qinyan YUE, Yuanfeng QI, Baoyu GAO, Hui YU

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 1,   Pages 117-124 doi: 10.1007/s11783-010-0220-3

Abstract: In this work we investigated the chemical, thermal and toxic properties of dried sewage sludge (DSS),the preparation and properties of lightweight sludge ceramic (LSC) and the mechanisms of action of the

Keywords： sludge     foaming agents     ceramics     preheating process    

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Effect of wastewater composition on the calcium carbonate precipitation in upflow anaerobic sludge blanket

Shucheng YANG, Yanling HE, Charles CHOU, Pengxiang ZHANG, Dongqi WANG, Yonghong LIU,

Frontiers of Environmental Science & Engineering 2010, Volume 4, Issue 2,   Pages 142-149 doi: 10.1007/s11783-010-0026-3

Abstract: to study the effect of wastewater composition on calcium carbonate precipitation in upflow anaerobic sludgehad significant influence on the location of calcium carbonate precipitation in anaerobic granular sludgewhich was expected due to the different methanogens distribution and pH gradient within the granular sludgecarbonate precipitation substantially affected the specific methanogenic activity (SMA) of the granular sludge

Keywords： calcium carbonate     precipitation     anaerobic granular sludge     wastewater composition     microstructure     upflowanaerobic sludge blanket (UASB)    

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Convective heat transfer in helical coils for constant-property and variable-property flows with high

Yufei MAO, Liejin GUO, Bofeng BAI, Ximin ZHANG

Frontiers in Energy 2010, Volume 4, Issue 4,   Pages 546-552 doi: 10.1007/s11708-010-0116-8

Abstract: Both constant-property flows at normal pressure and variable-property flows at supercritical pressure

Keywords： convective heat transfer     helical coils     high Reynolds number     supercritical pressure     variable property    

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A review on the application of nanofluids in enhanced oil recovery

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 8,   Pages 1165-1197 doi: 10.1007/s11705-021-2120-4

Abstract: Enhanced oil recovery (EOR) has been widely used to recover residual oil after the primary or secondary oil recovery processes. Compared to conventional methods, chemical EOR has demonstrated high oil recovery and low operational costs. Nanofluids have received extensive attention owing to their advantages of low cost, high oil recovery, and wide applicability. In recent years, nanofluids have been widely used in EOR processes. Moreover, several studies have focused on the role of nanofluids in the nanofluid EOR (N-EOR) process. However, the mechanisms related to N-EOR are unclear, and several of the mechanisms established are chaotic and contradictory. This review was conducted by considering heavy oil molecules/particle/surface micromechanics; nanofluid-assisted EOR methods; multiscale, multiphase pore/core displacement experiments; and multiphase flow fluid-solid coupling simulations. Nanofluids can alter the wettability of minerals (particle/surface micromechanics), oil/water interfacial tension (heavy oil molecules/water micromechanics), and structural disjoining pressure (heavy oil molecules/particle/surface micromechanics). They can also cause viscosity reduction (micromechanics of heavy oil molecules). Nanofoam technology, nanoemulsion technology, and injected fluids were used during the EOR process. The mechanism of N-EOR is based on the nanoparticle adsorption effect. Nanoparticles can be adsorbed on mineral surfaces and alter the wettability of minerals from oil-wet to water-wet conditions. Nanoparticles can also be adsorbed on the oil/water surface, which alters the oil/water interfacial tension, resulting in the formation of emulsions. Asphaltenes are also adsorbed on the surface of nanoparticles, which reduces the asphaltene content in heavy oil, resulting in a decrease in the viscosity of oil, which helps in oil recovery. In previous studies, most researchers only focused on the results, and the nanoparticle adsorption properties have been ignored. This review presents the relationship between the adsorption properties of nanoparticles and the N-EOR mechanisms. The nanofluid behaviour during a multiphase core displacement process is also discussed, and the corresponding simulation is analysed. Finally, potential mechanisms and future directions of N-EOR are proposed. The findings of this study can further the understanding of N-EOR mechanisms from the perspective of heavy oil molecules/particle/surface micromechanics, as well as clarify the role of nanofluids in multiphase core displacement experiments and simulations. This review also presents limitations and bottlenecks, guiding researchers to develop methods to synthesise novel nanoparticles and conduct further research.

Keywords： nanofluid     EOR mechanism     nanoparticle adsorption     interface property     internal property    

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New insights into different surfactants’ impacts on sludge fermentation: Focusing on the particular metabolic

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 8, doi: 10.1007/s11783-022-1527-6

Abstract:

• The promoting effects for VFA generation follow the order of APG>SDBS>HTAB.

Keywords： Waste activated sludge (WAS)     Volatile fatty acids (VFA)     Surfactant types     Functional microorganisms    

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Fate of proteins of waste activated sludge during thermal alkali pretreatment in terms of sludge protein

Xiaoli Song, Zhenghua Shi, Xiufen Li, Xinhua Wang, Yueping Ren

Frontiers of Environmental Science & Engineering 2019, Volume 13, Issue 2, doi: 10.1007/s11783-019-1114-7

Abstract: itemcontent>

Over 90 min of TAH at the optimal condition, 67.59% sludge

Keywords： Sludge flocs     Microbial cells     Hydrolysate     Protein breakdown     Melanoidin    

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Title Author Date Type Operation

Evaluation of activated sludge properties’ changes in industrial-wastewater pre-treatment: role of residual

Journal Article

Aggravation of membrane fouling and methane leakage by a three-phase separator in an external anaerobic ceramic membrane bioreactor

Chao Pang, Chunhua He, Zhenhu Hu, Shoujun Yuan, Wei Wang

Journal Article

A computational toolbox for molecular property prediction based on quantum mechanics and quantitativestructure-property relationship

Journal Article

Comparison between inhibitor and uncoupler for minimizing excess sludge production of an activated sludge

CHEN Guowei, XI Pengge, XU Deqian, YU Hanqing

Journal Article

Co-pyrolysis of sludge and kaolin/zeolite in a rotary kiln: Analysis of stabilizing heavy metals

Journal Article

Cultivation of aerobic granular sludge in a conventional, continuous flow, completely mixed activatedsludge system

Xi CHEN,Linjiang YUAN,Wenjuan LU,Yuyou LI,Pei LIU,Kun NIE

Journal Article

Control of sludge settleability and nitrogen removal under low dissolved oxygen condition

Zhaoxu PENG, Yongzhen PENG, Zhenbo YU, Xuliang LIU, Xiaoling LI, Randeng WANG

Journal Article

High-solid anaerobic digestion of sewage sludge: achievements and perspectives

Journal Article

A review on sustainable reuse applications of Fenton sludge during wastewater treatment

Journal Article

Properties and effect of forming sewage sludge into lightweight ceramics

Min YUE, Qinyan YUE, Yuanfeng QI, Baoyu GAO, Hui YU

Journal Article

Effect of wastewater composition on the calcium carbonate precipitation in upflow anaerobic sludge blanket

Shucheng YANG, Yanling HE, Charles CHOU, Pengxiang ZHANG, Dongqi WANG, Yonghong LIU,

Journal Article

Convective heat transfer in helical coils for constant-property and variable-property flows with high

Yufei MAO, Liejin GUO, Bofeng BAI, Ximin ZHANG

Journal Article

A review on the application of nanofluids in enhanced oil recovery

Journal Article

New insights into different surfactants’ impacts on sludge fermentation: Focusing on the particular metabolic

Journal Article

Fate of proteins of waste activated sludge during thermal alkali pretreatment in terms of sludge protein

Xiaoli Song, Zhenghua Shi, Xiufen Li, Xinhua Wang, Yueping Ren

Journal Article