Xiaoyuan Zhang

Nankai University | NKU

The volume reduction and subsequent solidification of soluble radionuclides have been known as the major challenges in global radioactive water management, with the urgent needs for new technology development. Thus, a novel forward osmosis (FO)-adsorption process was developed for decontamination of strontium-containing radioactive water. The FO fi...

With the speedy evolution of global climate change and water shortage, there is a growing need for the energy and carbon neutral wastewater reclamation technology. To tackle this challenge, an innovative anaerobic membrane bioreactor (AnMBR)-biochar adsorption-RO process was developed for reclaiming municipal wastewater to high-grade product water...

In current biological nitrogen removal (BNR) processes, most of ammonium in municipal wastewater is biologically transformed to nitrogen gas, making ammonium recovery impossible. Thus, this article aims to provide a holistic review with in-depth discussion on (i) current BNR processes for municipal wastewater treatment, (ii) environmental and econo...

Interactions between algae and bacteria are pivotal in transforming complex organics for microalgal-bacterial granular sludge process, but the intrinsic removal mechanisms have not been well understood. Here, we investigate the mechanisms by which complex organics are removed from municipal wastewater. Complex organics can be disposed during day-ni...

Current biological wastewater treatment processes usually have a drawback of insufficient nitrogen (N) removal, contributing to the ubiquitous eutrophication of aquatic ecosystems globally. To address such a challenging situation, this study explored an innovative microalgal-bacterial granular sludge-marimo (MBGS-MA) coupling process. The process r...

Although the hazards of zinc oxide particles (ZnO-NPs) in the field of wastewater treatment are receiving more and more attention, the responses of metabolism and migration pathways of microalgal-bacterial symbiosis to ZnO-NPs have not been well understood. Here, the distribution of ZnO-NPs along with its impact on metabolism in microalgal-bacteria...

Algae-bacteria interactions play an essential role in the transformation of complex organics in microalgal-bacterial granular sludge (MBGS), but the intrinsic removal mechanisms have not been well understood. This study thus attempted to investigate the removal performance and mechanisms of complex organics in real municipal wastewater in MBGS proc...

Sludge bed position in the reactor is one of the key parameters for microalgal-bacterial granular sludge (MBGS) process, which lacks of study. To fill this gap, this study investigated the influence of sludge bed position on MBGS. The sludge bed located closer to the bottom of the bioreactor demonstrated the optimal pollutant removal performance du...

The membrane bioreactor (MBR) with nitritation based nitrogen removal processes has attracted growing interest in recent years, although membrane fouling in the nitritation MBR is a challenging issue. In this study, the inhibitory effect of free nitrous acid (FNA) on microbial extracellular polymeric substances (EPS) production and membrane fouling...

The mainstream deammonification of municipal wastewater has been recognized as one of the greatest challenges in wastewater engineering. The conventional activated sludge process has disadvantages of high energy input and sludge production. To tackle this situation, an innovative A-B process, where an anaerobic biofilm reactor (AnBR) was functioned...

This work reported the development, performance and microbial community of microalgal-bacterial biofilms cultivated in a continuous-flow photoreactor for municipal wastewater treatment under various conditions. Results showed that microalgal-bacterial biofilms were successfully developed at a HRT of 9 h without external aeration, with a biofilm con...

As a sustainable wastewater treatment process, it is unclear whether the microalgal-bacterial granular sludge (MBGS) can adapt to the continuous light-deficiency environment, which hinders the further application of this technology under natural outdoor conditions when the sunlight is insufficient. Herein, this study investigated the performance of...

The rapidly evolving global climate change has an unprecedented impact sustainable water supply, but also challenges and water shortage global food security. In such a dynamic situation, this study explored direct recovery of ammonium from the effluent of a pilot-scale anaerobic membrane bioreactor (AnMBR) treating actual municipal wastewater via b...

Ca/Fe-rich antibiotic fermentation residues (AFRs), a type of hazardous waste, can be regarded as recyclable biomass and metal resources. However, concurrent detoxification and reutilization of biomass and metals resources from AFRs have never been reported before. In this study, Ca/Fe-rich vancomycin fermentation residues were pyrolyzed into bioch...

Hydrolysis plays an imperative role in the abiotic transformation process of antibiotics in aqueous solutions. However, little information is available on the hydrolysis process of spectinomycin (an aminocyclitol antibiotic). This study systematically investigated the spectinomycin hydrolysis kinetics and mechanisms under different pH via experimen...

Manuscript Submission Deadline 30 October 2022 With the fast-evolving global climate change, increasing efforts have been devoted to the mitigation of greenhouse gases (GHGs) emission from municipal wastewater treatment plants where, in fact, they have been found to be an important source of GHGs. It should be aware that the carbon taxing and trad...

As an emerging green wastewater treatment technology, the microalgal-bacterial granular sludge (MBGS) process has attracted increasing interest under the current situation of global climate change. However, little information is available for its performance in treating municipal wastewater under outdoor conditions. Thus, this study evaluated the b...

The conventional activated sludge (CAS) process as one of the greatest engineering marvels has made irreplaceable contributions towards the human development in the past one hundred years. However, the underlying principle of CAS which is primarily based on biological oxidation has been challenged by accelerating global climate change. In such a si...

Various anaerobic processes have been explored for the energy-efficient treatment of municipal wastewater. However, dissolved methane in anaerobic effluent appears to be a barrier towards the energy and carbon neutrality of wastewater treatment. Although several dissolved methane recovery methods have been developed, their engineering feasibility a...

Recently, increasing interest has been placed in microalgal-bacterial granular sludge (MBGS) in the journey towards the energy and carbon neutrality of municipal wastewater treatment. Different from aerobic granular sludge, the performance of MBGS is mainly determined by the mutualism and symbiosis between coexisting microalgae and bacteria. It app...

Membrane distillation (MD) is a thermally driven desalination process that has excellent application prospects in seawater desalination or hypersaline wastewater treatment, while severe temperature polarization (TP) and the resulting relatively high energy consumption have become principal challenges limiting the commercial application of MD. There...

Wastewater usually contains various species of heavy metals, thus understanding of competitive adsorption kinetics of metallic ions in a multi-component system is necessary for developing an innovative adsorption process for wastewater decontamination. In this study, a novel adsorbent, namely nanostructured layered sodium vanadosilicate, was synthe...

With gradual transformation of global linear economy to circular economy, the present municipal wastewater treatment processes designed with the philosophy of take-make-dispose are facing incredible economic and environmental pressures due to high energy consumption, emission of greenhouse gases, waste generation etc. In such a situation, “we canno...

Water shortage is currently regarded as a pressing issue in urban sustainability around the world. Reclamation of municipal wastewater offers an emerging avenue for future urban water supply. In the past few decades, membrane technologies have evolved considerably, playing an increasingly important role in municipal wastewater reclamation, due to t...

With rapid global urbanization and increasing population, the water shortage is becoming a pressing issue for urban sustainability due to limited availability of natural water resource and increasing demand on fresh water. In such a situation, reclaimed municipal wastewater has been actively considered as a supplementary water source for sustaining...

Layered sodium vanadosilicates was synthesized for removing soluble strontium ion (Sr²⁺) from simulated radioactive wastewater. SEM, EDS and TEM images indicated that layered sodium vanadosilicates had a nanostructure with flake-like shape providing an extremely large surface area. XRD, FTIR and XPS analyses further revealed a framework structure o...

Radioactive waste is a byproduct of nuclear power generation and applications of various radioactive materials in many fields. This waste has been strictly regulated as a highly hazardous material to all forms of life and the environment. The technologies currently adopted for managing radioactive waste are mainly based on segregation and storage....

Due to the lack of natural water resources and the rapid growth of population and economy, China is currently facing the pressing challenge of water shortage. Current evidence suggests that the traditional water resources including surface water and groundwater could not be enough to sustain increasing water demand which has been projected to hit 8...

Online chemical cleaning of membrane bioreactor (MBR) with sodium hypochlorite (NaClO) has been extensively applied for membrane fouling mitigation. However, it was recently revealed that residual NaClO from the online cleaning of MBR caused serious microbial lysis with the subsequent formation of dissolved organic matter (DOM), in which a substant...

The operation of current biological sewage treatment processes is mainly based on the bio-oxidation principle with the input of substantial amount of energy for oxidation of sewage COD and ammonia. Meanwhile, an extremely large quantity of waste sludge is inevitably produced through biological conversion of soluble COD to biomass. With tightened ef...

A synthesis method was introduced for the large-scale preparation of a nano Cu2O/Cu-modified activated carbon composite, L-nano Cu2O/Cu–C. As the adsorbent, the synthesized composite could efficiently remove radioactive iodide ions (I⁻) from simulated water. A lab-scale integrated novel countercurrent two-stage adsorption and membrane separator sys...

为解决除碘吸附剂吸附效率较低的问题, 开发出排除吸附剂脱附干扰的新型二级逆流吸附工艺. 采用烧杯实验考察吸附剂对自来水中 I-的吸附特性, 初始 I-浓度为 2.00 mg· L-1, 90 min 达到吸附平衡, 且较好符合 Langmuir 吸附等温式. 这种吸附剂吸附 I-后会发生显著的脱附. 基于吸附剂的特性和 Langmuir 吸附等温式, 设计出新型二级逆流吸附工艺, 并提出该工艺的计算模型, 用于预测该工艺出水 I-的浓度. 结果表明, 该工艺能有效提高模拟放射性废水中 I-的去除效率, 其出水 I-的平均浓度为 0.150 mg· L-1, 去除率达到 92.5%. 计算出水 I-浓度为 0.124 mg· L-1, 去除率为 93.8%, 实测值与模型计算值接近. 与常规单...

A newly developed adsorbent nano Cu2O/Cu-modified activated carbon composite (nano Cu2O/Cu-C) was used to remove radioactive iodide ions (I-) from simulated wastewater. The emphasis of this research is to improve adsorption performance and obtain higher I- removal efficiency compared with the single-stage adsorption. To fully develop the amount of...

介绍了吸附法去除水体中放射性碘的研究进展与应用现状, 对技术特点进行了总结和分析. 叙述了活性炭, 天然无机材料, 纳米材料, 离子交换树脂和生物吸附材料处理放射性碘污染废水的研究进展. 为寻求性能优异, 选择性强, 稳定性好的新型吸附材料用于水体中放射性碘的去除, 依然是未来研究的方向; 需要采用更为先进的技术, 深入研究吸附机理; 积极研发与这些吸附材料相适应的成套水处理工艺和设备, 或与现有的成熟的放射性废水处理工艺相结合, 扩大吸附材料在水体中放射性碘处理中的应用范围, 提高应用效率.

随着核能的开发与利用,放射性污染已经成为一个严峻的环境问题,放射性废水的处理日益引起人们的重视.近年来,纳米技术飞速发展,纳米材料已成为一种新型材料.纳米材料具有独特的物理化学性质,如小尺寸效应,巨大比表面积,极高的反应活性等,这些特性使纳米材料在水处理领域展现了巨大的应用潜力.利用新颖高效的纳米材料吸附去除废水中的放射性核素已越来越受到研究者的关注.本文综述了国内外纳米材料吸附处理废水中放射性核素的研究进展,主要总结了碳纳米材料,纳米金属氧化物,钛基纳米材料,零价金属纳米颗粒对放射性废水的处理性能,简要阐述了纳米材料对放射性核素的吸附机理.最后,对纳米材料去除放射性核素污染研究的未来发展方向及待研究问题进行了展望.

Palladium-loaded (Pd-loaded) anatase TiO2 with dominant {0 0 1} facets used as photocatalysts was prepared by a two-step process. Three dimensional flower-like structures of anatase TiO2 with exposed {0 0 1} facets were synthesized by solvothermal method, and then Pd nanoparticles were photodeposited onto the {1 0 1} surface of TiO2 by UV reduction...

Semiconductor photocatalytic technology is an effective approach to solve the problem of environment pollution and energy crisis. Titanium dioxide (TiO2) is currently the most extensively used semiconductor photocatalyst . However, the applications of TiO2 are limited by some of its disadvantages. In this regard, combining TiO2 with GR is an effect...

采用二步水热法和光照还原法制备了银负载TiO2纳米线/石墨烯(GR/TiO2NW/Ag)复合材料,并对其进行了表征,结果表明:Ag纳米颗粒修饰的TiO2NW分布于石墨烯表面,TiO2NW为锐钛矿晶型,光生电子和空穴复合效率降低.并研究了GR/TiO2NW/Ag复合材料在紫外光下降解双酚A废水的光催化性能,实验结果表明,GR/TiO2NW/Ag对双酚A的降解效果明显优于TiO2.40min内,GR/TiO2NW/Ag在紫外光照下对双酚A降解率达到100%.

Nitrogen-doped lanthanum titanate decorated on graphene sheets (GR/N-doped La2Ti2O7) used as photocatalyst was prepared by a two-step process. To synthesize GR/N-doped La2Ti2O7, La2Ti2O7 was initially developed under heat treatment in NH3 and subsequently decorated on GR by hydrothermal processing. The resulting GR/N-doped La2Ti2O7 was characterize...

双酚 A 污染问题日益严峻, 已经威胁到人类的健康. 半导体光催化技术可以有效去除水体中双酚 A 污染. 近年来, 二氧化钛/石墨烯复合材料, 因其优越的光催化性能受到广泛关注. 尤其石墨烯等新型纳米碳基材料, 有较大的比表面积和丰富的官能团, 为二氧化钛的负载创造了良好的条件, 其表面可以形成化学键, 为双酚 A 的吸附降解提供了更多的活性位点. 本文重点介绍了国内外二氧化钛/石墨烯复合材料的制备方法及各种制备方法的优缺点; 讨论了二氧化钛/石墨烯复合材料对双酚 A 的降解效果及其降解机理; 分析了二氧化钛/石墨烯复合材料的再生性能. 最后总结这种材料在实际应用中存在的问题及其前景展望.

We prepared nano-zero-valent iron (nZVI) and N co-modified TiO2 (nZVI/N-TiO2) nanotube arrays as an enhanced visible-light photocatalyst. The TiO2 nanotube arrays were synthesized by electrochemical anodization of Ti foil in a two-electrode system. Amorphous TiO2 nanotube arrays were immersed in ammonia and then annealed to produce crystalline N-do...

Different graphene (GR)-modified morphologies of TiO2 including nanoparticles, nanorods and nanowires were prepared by a simple and efficient electrostatic self-assembly method followed by a hydrothermal reduction process. Characterisations reveal that different morphologies of TiO2 are distributed on GR and that they decrease the electron-hole rec...

A new method for the degradation of bisphenol A (BPA) in aqueous solution was developed. The oxidative degradation characteristics of BPA in a heterogeneous Fenton reaction catalyzed by Fe3O4/graphite oxide (GO) were studied. Transmission electron microscopic images showed that the Fe3O4 nanoparticles were evenly distributed and were ∼6 nm in diame...

An electrochemical sensor for the sensitive and convenient determination of 4-chlorophenol (4-Cp) was developed based on TiO2-modified graphene nanoparticle casting onto screen-printed carbon electrodes (TiO2-graphene oxide (GO)/SPE). A facile hydrothermal method was performed to prepare the novel TiO2-GO nanoparticles. Scanning electron microscopy...