Qiulai He

Qiulai He
Hunan University · Department of Water Science and Engineering

Doctor of Engineering

About

63
Publications
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Introduction

Publications

Publications (63)
Article
Filamentous sludge bulking poses great threats to operational stability of aerobic granular sludge. Exploration of the microbial community aids knowledge of the causative factors to sludge bulking and guides directions for corresponding actions for prevention and controlling. Detailed changes of bacterial community within the non-bulking and bulkin...
Article
A simultaneous nitrification-denitrification and phosphorus removal (SNDPR) system operated in an alternating anaerobic/aerobic/anoxic (A/O/A) mode was revisited from new perspectives of sludge reduction and potential phosphorus recovery. Reliable and robust removal performance was obtained even under winter temperatures, with average removal effic...
Article
Full-text available
An anaerobic/aerobic/anoxic mode simultaneous nitrification, denitrification, and phosphorus removal system was visited for enhanced low-strength wastewater treatment and dramatic in situ sludge reduction. Results showed that rapid start-up was achieved with conventional activated sludge after 15 days, with effluent ammonia nitrogen, total nitrogen...
Article
Full-text available
Caproate production from volatile fatty acids (VFAs) through chain elongation processes in electro-fermentation is a sustainable and promising technique for organic waste recycling and resources recovery. However, the small surface area of working electrode is one of the main factors impeding the improvement of performance. Therefore, fluidized cat...
Article
Full-text available
Bioretention is a promising approach for rainwater runoff treatment, while effective performances can hardly be expected from traditional systems. Several amended bioretention columns were configured for enhanced pollutants removal with different media designs and submerged depths. Results revealed that amended media largely stimulated simultaneous...
Article
Zero-valent copper particles (Cu⁰) used to degrade pollutant due to its in-site generation and activation of hydrogen peroxide (H2O2), while the disproportionation of Cu⁺ limited the efficacy. In this study, spiking chloride ion (Cl⁻) into zero-valent copper (Cu⁰) system (Cl⁻/Cu⁰ system) enhanced greatly acetaminophen degradation. The addition of C...
Article
Full-text available
The black-odor water in urban water bodies is increasingly found, resulting in serious atrophy of water bodies and degradation of water ecosystems. At present, the pollution status of the sediments as an internal source still remains much unknown. In order to assess the pollution status of black-odor water sediments, the content of total nitrogen,...
Article
Full-text available
The nutrients availability determined efficiency of biological treatment systems, along with the structure and metabolism of microbiota. Herein nutrients deficiencies on aerobic granular sludge were comparatively evaluated, treating wastewater with mass ratios of chemical oxygen demand to nitrogen to phosphorus being 200:20:4, 200:2:4, and 200:20:0...
Article
Herein, alginate-based porous nanocomposite hydrogel (CPGA) was produced using alginate as entrapment agent, polyaniline-polypyrrole-modified graphene oxide (GPP) as functional filler, and CaCO3 as pore-former for enhanced Cu(II) removal from water. Synergism among tri-components help to 3D network formation and Cu(II) removal. The parameters of co...
Article
Preferable biocarrier is vital for start-up and operation of moving bed biofilm reactor (MBBR). Effects of three separate biocarriers - PPC, PU, and PP on MBBRs were systematically investigated including nutrients removal performances, biomass attachment, microbial community, and relevant functional genes. Results showed that three biocarriers achi...
Article
Here we reported a novel xanthated chitosan-entrapped gamma-alumina (XCSA) composite sorbent that presents effective removal toward toxic hexavalent chromium ions [Cr(VI)] from water. The samples were characterized by FTIR, SEM-EDS, XRD, TGA, and XPS. Batch sorption experiments were performed to investigate the influences of component ratio, initia...
Article
Zero−valent copper activated peroxymonosulfate (Cu(0)/PMS) system had widely studied for degrading contaminant due to being highly efficient. However, the weak reactivity and easy dismutation of Cu(I) in acid condition restrained its efficiency. In our study, ferric ion (Fe(III)) significantly enhanced Cu(0)/PMS system for acetaminophen degradation...
Article
Zero-valent copper activated peroxymonosulfate (ZVC/PMS) system was widely used to degrade refractory contaminants due to being highly effective. However, the low reactivity and easy dismutation of cuprous species (Cu(I)) in acid condition limited its efficiency. In our study, ZVC coupled with ferrous ion (Fe(II)) promoted PMS to degrade orange II....
Article
Novel porous alginate-based nanocomposite hydrogels were prepared by incorporating polyaniline-polypyrrole modified graphene oxide ([email protected]) as reinforcing fillers into the alginate matrix ([email protected]/SA) for Cr(VI) and Cu(II) removal from water. Different in-situ co-polymerization functionalized GO with Py-to-An mass ratios of mon...
Article
The objective of this study was to understand how lactate-to-butyrate ratio and substrates concentrations affect the caproate production and product structure. The results showed that a higher butyrate-to-lactate ratio is beneficial to caproate production at low initial lactate concentration. Low pH (5.0) and low substrate concentration (20 mM and...
Article
Aerobic granular sludge as a promising technology showed great resistance to adverse conditions. However, the interaction between oxytetracycline (OTC) and granular sludge was not studied sufficiently. This study therefore investigated OTC-tolerance ability of incomplete and complete granulation sludge from aspects of simultaneous nutrients removal...
Article
A novel strategy to intensify the degradation of ofloxacin with simultaneous production of renewable electrical energy was achieved in photo-assisted microbial fuel cell with LiNbO3/CF photocatalytic cathode. The system exhibited a maximum open circuit potential and power output of 0.806 V and 0.546 W/m² respectively, with the calculated internal r...
Article
Microbial fuel cell is an energy-saving bioelectrochemical method for degrading organic pollutants, but it has some limitations in practical application due to the high cathode overpotential, low power output and slow degradation efficiency. Here, a novel photo-catalytic microbial fuel cell (Photo-MFC) coupling with a bioanode and a photocatalytic...
Article
Salinity stress during anaerobic digestion is known to cause extensive changes in biogas production and microbial community structure. Thus, our study sought to characterize the adaptation response of bacteria when challenged with increased salinity. Firstly, experiments were conducted at eight salinity levels at a constant kitchen waste/inoculum r...
Article
Aerobic granular sludge-based simultaneous nitrification, denitrification and phosphorus removal (SNDPR) systems were configured for the treatment of low-strength municipal wastewater. Granular characteristics, process performance, and the corresponding microbial ecology dynamics were comprehensively explored with sodium acetate and succinate as mi...
Article
Novel biochar/pectin/alginate hydrogel beads (BPA) derived from grapefruit peel were synthesized and used for Cu(II) removal from aqueous solution. FTIR, SEM-EDS, XRD, TGA and XPS, etc. were applied for characterization analysis. The synergistic reinforcing effect of polymer matrix and biochar fillers improved the adsorptive, mechanical and thermos...
Article
Effects of additional alkalinity on the performance of aerobic granular sludge (AGS) in sequencing batch reactors (SBR) performing simultaneous nitrification, denitrification, and phosphorus removal (SNDPR) were evaluated. Results showed that COD and ammonia-N (NH4+-N) were slightly stimulated and remained high and stable with the increase of alkal...
Article
In this work, a pilot-scale low dissolved oxygen (DO) composite biological system (LDOCBS) composed of an anoxic rotating biological contactor (RBC) and four aeration tanks with gradient aeration was used to treat landfill leachate for 88 d. The maximum removals of 85.65%, 99.92% and 84.06% for chemical oxygen demand (COD), ammonia (NH4+-N) and tot...
Article
The lab-scale system combined bioelectrochemical and sulfur autotrophic denitrification (CBSAD) was established to evaluate the effects of currents (50-300 mA) on both the performances and microbial communities. Results showed that the nitrate removal rate increased significantly when the current increased from 50 to 200 mA, while it slightly decre...
Article
Full-text available
In this work, a novel biochar was prepared from the Artemisia argyi stem at 300 °C (AS300), 450 °C (AS450), and 600 °C (AS600). The structural properties of these biochars were characterized with various tools. The sorption kinetic processes of Cr(VI) and Cu(II) onto these biochars were better described by the pseudo-second order. The sorption isot...
Article
Simultaneous nitrification, denitrification and phosphorus removal (SNDPR) using aerobic granules is a promising approach in water treatment. The present work investigated the effects of influent carbon to nitrogen (N) ratios (20, 10, and 4) on the SNDPR performance in aerobic granular sequencing batch reactors (AGSBR) under high aeration rate. Res...
Article
Wastewater treatment by means of algal-bacterial granules has become a hot topic worldwide recently. Rapid granulation of algal-bacterial granules was achieved in an aerobic bacterial granular sequencing batch reactor (SBR) under natural sunlight exposure. Occurrence of abundant filamentous bacteria bridging the water-born algae, and overproduction...
Article
The lab-scale aerobic granules process was applied for low carbon to nitrogen (C/N < 4) wastewater treatment under different hydrodynamic shear forces. Results revealed that aerobic granules exhibited strong adaptability and stability. The aerobic granules might adopt an extracellular polymeric substances (EPS) regulating mechanism to address the c...
Article
A novel bioelectrochemical system (BES) was established to investigate the feasibility of simultaneous autotrophic denitrification and chromium removal under different pH conditions in terms of the removal performance and dominant microbial community. Reliable nitrate and hexavalent chromium (Cr (VI)) removal was obtained, and the optimum pH was 7....
Article
A new operating approach by reducing the aeration time while keeping high intensity was evaluated for enhanced nutrients removal and maintenance of granular stability. Three aerobic granular sequencing batch reactors (SBR) performing simultaneous nitrification, denitrification and phosphorus removal (SNDPR) were run at different aeration time (120,...
Article
A bacterial strain (designated as YP1) was isolated from an aerobic granular sequence batch reactor (SBR) performing simultaneous nitrogen and phosphorus removal. Based on the morphological, biochemical characteristics, and phylogenetic analysis of 16S rRNA gene sequence, YP1 was identified as Pseudoxanthomonas sp. strain. Strain YP1 was confirmed...
Article
In this study, we prepared a novel hybrid functionalized chitosan-Al2O3@SiO2composite (FCAS) for removing hexavalent chromium [Cr(VI)] from aqueous system. Spectroscopic studies like Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and energy dispersive spectroscope (EDS)...
Article
Development of simultaneous nitrification, denitrification and phosphorus removal (SNDPR) is a promising approach for domestic wastewater treatment. Mixed carbon sources by sodium acetate and glucose at various ratios (3:1, 1:1, and 1:3) were investigated to evaluate the effects on the sequencing batch reactors (SBR) based on aerobic granules. Resu...
Article
Abstract An aerobic granular simultaneous nitrification, endogenous denitrification and phosphorus removal (SNDPR) system was configured for simultaneous carbon and nutrients removal fed with low-strength synthetic wastewater (0.3 kg COD/(m3·d)). The SNDPR system was operated on an anaerobic/oxic/anoxic (AOA) mode with a gradually dropping superfic...
Article
Full-text available
This paper presents the synthesis of a novel core–shell covalently functionalized Fe3O4 coated SiO2 decorated graphene oxides (Fe3O4@SiO2–GO) adsorbent. The prepared Fe3O4@SiO2–GO was characterized by fourier transform infrared spectrum, X-ray diffraction(XRD), X-ray photoelectron spectroscopy (XPS), and magnetic measurements. And the adsorption...
Article
An aerobic granules simultaneous nitrification, denitrification and phosphorus removal (SNDPR) system was evaluated in terms of the reactor performance and microbial population dynamics with decreasing C/P ratios from 50 to 16. The effects of C/P ratios on organic carbon and nutrients removal were investigated, as well as the alpha diversity of the...
Article
The evolution of removal performance and bacterial population dynamics of an aerobic granular sequencing batch reactor were investigated during stable operation and reactivation after prolonged storage. The system was run for a period of 130 days including the stable condition phase, storage period and the subsequent reactivation process. Excellent...
Article
Bench and pilot scale experiments were conducted to investigate and compare the preoxidation effects of potassium permanganate (KMnO4) and ozone (O3) for odor removal in drinking water. The effects of dosage, contact time, pH, as well as couple treatment with a granular activated carbon (GAC) filter were examined using bench experiments, while the...
Article
The increasing use of zinc oxide nanoparticles (ZnO NPs) has raised concerns about the environmental threats to the wastewater treatment systems. Shock loading of 10, 50 and 100 mg/L ZnO NPs was conducted to evaluate impacts on reactor performance, microbial activities and extracellular polymeric substances (EPS) in parent aerobic/oxic/anoxic (A/O/...
Article
The adsorption of methylene blue (MB) by low cost biomass lotus seedpod (LSP) was optimized by a central composite design combined with response surface methodology in aqueous solution. Solution pH, initial dye concentration and adsorbent dosage were studied as independent variables at five levels each, respectively. Analysis of variance suggested...
Article
Full-text available
Carbon and nutrients as well as suspended solids (SS) removal by chemically enhanced primary treatment (CEPT) were conducted in the Qingshan wastewater treatment plant in Huangshi, Hubei Province. Feasibility of this process for wastewater treatment were investigated in detail by comparing the removal performance of three inorganic chemical coagula...
Article
An aerobic granular sequencing batch reactor (SBR) on an aerobic/oxic/anoxic (AOA) mode was operated for 50days with acetate sodium as the sole carbon source for simultaneous carbon, nitrogen and phosphorus removal. Excellent removal efficiencies for chemical oxygen demand (COD) (94.46±3.59%), nitrogen (96.56±3.44% for ammonia nitrogen (NH4(+)-N) a...
Conference Paper
Full-text available
Enhanced formation of aerobic granulation was investigated by adding yellow earth as a nucleating agent in a sequencing batch reactor with a constant setting time of 10 min. As a result, granules with an average diameter over 1 mm were obtained on the 4th day. The mature granules behaved better than the seed sludge in the water content, specific gr...
Article
The potential of powdered activated carbon (PAC) adsorption for odor removal in low turbidity drinking water was investigated. The batch experiments were conducted under various conditions including PAC species, dosage, contact time, dosing point. Effect of pre-chlorination and PAC dosage on turbidity were also studied. Results showed that adsorpti...
Article
Fed with three different kinds of influent, i.e. sodium acetate-based synthetic wastewater, synthetic wastewater with 10-mg L−1 Ca2+ ions, and raw domestic wastewater, respectively, compact of different influent wastewater on aerobic granulation was investigated in three sequencing batch reactors (corresponding to R1–R3) operating in an alternating...
Article
Effects of some key factors on hydrogenotrophic denitrification were investigated in lab-scale bioreactors. Results indicated that optimum biomass loading, pH value, temperature, nitrate loading, and C/N ratio in this study were optical density at 600 nm (OD600) of 0.173, 6.0∼7.0, 35 °C, 105 mg L(-1), and 30, respectively. To obtain a better unders...
Article
Static experiments were conducted to investigate the effects of environmental factors on nitrate (NO3−-N)-removal efficiency, such as NO3−-N loading, pH value, C/N ratio and temperature in activated sludge using Fe (II) as electron donor. The results demonstrated that the average denitrification rate increased from 1.25 to 2.23 mg NO3−-N/(L·h) with...

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