Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling

Hangzhou, China

Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling

Hangzhou, China
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HE S.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | YANG X.,Zhejiang University | HE Z.,University of Florida | BALIGAR V.C.,U.S. Department of Agriculture
Pedosphere | Year: 2017

Cadmium (Cd) contamination has posed an increasing challenge to environmental quality and food security. In recent years, phytoremediation has been particularly scrutinized because it is cost-effective and environmentally friendly, especially the use of metal-hyperaccumulating plants to extract or mine heavy metals from polluted soils. Under Cd stress, responses of hyperaccumulator and non-hyperaccumulator plants differ in morphological responses and physiological processes such as photosynthesis and respiration, uptake, transport, and assimilation of minerals and nitrogen, and water uptake and transport, which contribute to their ability to accumulate and detoxify Cd. This review aims to provide a brief overview of the recent progresses in the differential responses of hyperaccumulator and non-accumulator plants to Cd toxicity in terms of growth and physiological processes. Such information might be useful in developing phytoremediation technology for contaminated soils. © 2017 Soil Science Society of China


Hu L.,China Jiliang University | Du Y.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | Long Y.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling
Ecological Engineering | Year: 2017

Emissions of H2S from landfill sites have serious impacts on the health of employees and residents who work and live in the surrounding area. Two groups of simulated landfills, a conventional landfill (CL) and a landfill with leachate recirculation (RL), were designed to investigate the H2S release patterns during the initial stage of landfill stabilization. The results show that large amounts of H2S can be released with the degradation of sulfur-containing compounds. In particular, emissions of H2S can be promoted with leachate recirculation in RL due to the enhanced microbe activity. There were large amounts of sulfate and low levels of sulfide in the landfilled refuse and leachate in the initial stages of landfill stabilization. Sulfate and sulfide production in leachate depended on the volume of leachate and the temperature. Leachate recirculation means that sulfate and sulfide are retained in the landfill, thereby distributing them more evenly through the landfilled refuse, increasing the potential risk of H2S release. © 2017 Elsevier B.V.


Hu L.,China Jiliang University | Long Y.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling
Environmental Science and Pollution Research | Year: 2016

Levels of methane (CH4) oxidation in materials used for landfill cover attained in the laboratory are not often replicated in the field due to effects from the surrounding environment. This study investigates the three dominant factors affecting CH4 oxidation in the cover layer, namely, the thickness of cover layer, the methanotroph spraying manner, and the osmotic coefficient of the cover material. Results show that improved CH4 emission performance of the cover layer can be realized if methanotroph are introduced, meaning that a thinner cover layer is required. The highest CH4 emission reduction can be realized by spraying methanotroph into the top, middle, and bottom layers of a 30-cm thick cover layer with an osmotic coefficient of 7.76 × 10−5 cm s−1. Comparing results on cover layer thickness, methane monooxygenase (MMO) activity was much lower with increasing thickness meaning that the thicker cover could reduce O2 availability, thus inhibiting MMO activity. This suggests that MMO may be responsible for differences in CH4 emission reduction and/or oxidation making the osmotic coefficient an important factor for cover layer material. © 2016 Springer-Verlag Berlin Heidelberg


Feng Y.-J.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | Yang Y.-Q.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | Zhang C.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | Song E.-X.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | And 2 more authors.
Waste Management | Year: 2013

Residues from the imported wastes dismantling process create a great burden on the ambient environment. To develop appropriate strategies for the disposal of such residues, their characteristics were studied through background value analysis and toxicity leaching tests. Our results showed that the heavy metals concentrations in residues were high, particularly those of Cu (7180mgkg-1), Zn (2783mgkg-1), and Pb (1954mgkg-1). Toxicity leaching tests revealed a high metal releasing risk of such residues if they are disposed of in a landfill. However, the residues of imported wastes were also found to have some intrinsic metal recycling value. © 2013 Elsevier Ltd.


Long Y.-Y.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | Feng Y.-J.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | Cai S.-S.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | Ding W.-X.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | Shen D.-S.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling
Journal of Hazardous Materials | Year: 2013

The large amount of residues generated from dismantling waste electrical and electronic equipment (WEEE) results in a considerable environmental burden. We used material flow analysis to investigate heavy metal behavior in an incineration plant in China used exclusively to incinerate residues from WEEE dismantling. The heavy metals tested were enriched in the bottom and fly ashes after incineration. However, the contents of heavy metals in the bottom ash, fly ash and exhaust gas do not have a significant correlation with that of the input waste. The evaporation and recondensation behavior of heavy metals caused their contents to differ with air pollution control equipment because of the temperature difference during gas venting. Among the heavy metals tested, Cd had the strongest tendency to transfer during incineration (TCd=69.5%) because it had the lowest melting point, followed by Cu, Ni, Pb and Zn. The exchangeable and residual fractions of heavy metals increased substantially in the incineration products compared with that of the input residues. Although the mass of residues from WEEE dismantling can be reduced by 70% by incineration, the safe disposal of the metal-enriched bottom and fly ashes is still required. © 2013 Elsevier B.V.


Xiu F.-R.,Fujian University of Technology | Xiu F.-R.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | Zhang F.-S.,CAS Research Center for Eco Environmental Sciences
Journal of Hazardous Materials | Year: 2012

In this work, an effective and size-controlled process for preparing Cu2O nanomaterials from waste PCBs by supercritical water (SCW) combined with electrokinetic (EK) technique was developed. SCW was used for the pretreatment of waste PCBs, and highly uniform and monodisperse Cu2O nanoparticles with different sizes were prepared successfully from waste PCBs in EK process. Cu2O nanoparticles with average sizes of 5, 11, 25 and 40nm could be prepared in the presence of nanoparticles stabilizer (PVP) with the concentrations of 40, 30, 20 and 10g/L, respectively. The average size of Cu2O nanoparticles decreased from 49.5 to 18.2nm when current density increased from 10 to 20mA/cm2, and the size uniformity of nanoparticles was improved distinctly at a higher current density. The size of Cu2O nanoparticles increased with the increase of EK time, and agglomeration of particles was observed after 8h EK reaction. Up to 90wt% of the Cu in waste PCBs could be recovered as Cu2O nanoparticles under optimized condition. It is believed that the process developed in this study is simple and practical for size-controlled preparation of nanomaterials from waste PCBs or other Cu-rich solid wastes. © 2012 Elsevier B.V.


Xiu F.-R.,Fujian University of Technology | Xiu F.-R.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | Qi Y.,Fujian University of Technology | Zhang F.-S.,CAS Research Center for Eco Environmental Sciences
Waste Management | Year: 2013

Waste printed circuit boards (PCBs) contain a large number of metals such as Cu, Sn, Pb, Cd, Cr, Zn, and Mn. In this work, an efficient and environmentally friendly process for metals recovery from waste PCBs by supercritical water (SCW) pre-treatment combined with acid leaching was developed. In the proposed process, waste PCBs were pre-treated by SCW, then the separated solid phase product with concentrated metals was subjected to an acid leaching process for metals recovery. The effect of SCW pre-treatment on the recovery of different metals from waste PCBs was investigated. Two methods of SCW pre-treatment were studied: supercritical water oxidation (SCWO) and supercritical water depolymerization (SCWD). Experimental results indicated that SCWO and SCWD pre-treatment had significant effect on the recovery of different metals. SCWO pre-treatment was highly efficient for enhancing the recovery of Cu and Pb, and the recovery efficiency increased significantly with increasing pre-treatment temperature. The recovery efficiency of Cu and Pb for SCWO pre-treatment at 420. °C was 99.8% and 80%, respectively, whereas most of the Sn and Cr were immobilized in the residue. The recovery of all studied metals was enhanced by SCWD pre-treatment and increased along with pre-treatment temperature. Up to 90% of Sn, Zn, Cr, Cd, and Mn could be recovered for SCWD pre-treatment at 440. °C. © 2013 Elsevier Ltd.


Long Z.,Hunan University | Yang C.,Hunan University | Yang C.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | Zeng G.,Hunan University | And 3 more authors.
Fuel | Year: 2014

In this paper, the performance of catalytic oxidative desulfurization (ODS) were studied using catalyst W/D152 which was prepared by depositing tungsten on resin D152, a macroporous polyacrylic cationic resin. Dibenzothiophene (DBT) was selected as the target compound, and oil-soluble cyclohexanone peroxide (CYHPO) as an oxidant. The effect of different reaction parameters, including reaction temperature, reaction time, the weight of catalyst W/D152 and the molar ratio of CYHPO/DBT were investigated, and the oxidation mechanisms as well as the kinetics were also examined individually. The conversion of DBT and the sulfur content reached 99.1% and 3.52 ppm, respectively at the optimal catalytic conditions of 100 °C, mass ratio of model gasoline to catalyst W/D152 of 100, molar ratio of CYHPO/DBT of 2.5 and reaction time of 40 min. The catalyst could be reused for 7 times before the total sulfur content of treated model gasoline was higher than 10 ppm. The catalytic oxidation of DBT fitted the first-order kinetic model pretty well. The catalyst W/D152 was analyzed by the scanning electron microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR), and the data show that a thin layer of active components was covered on the catalyst surface which helps explain the satisfactory catalytic performance. © 2014 Elsevier Ltd. All rights reserved.


Zhou Y.,Southwest University of Science and Technology | Deng Y.,Southwest University of Science and Technology | He P.,Southwest University of Science and Technology | Dong F.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | And 2 more authors.
RSC Advances | Year: 2014

The thermodynamic conditions of the AgOH precipitation-dissolution equilibrium were investigated by the solubility product principle and the Van't Hoff isobaric equation, and a mathematical expression was obtained about the influence of concentration, temperature and pH on the balance of AgOH precipitation-dissolution in the ion-exchange process. It was shown that the silver-loading process of zeolite had a theoretical equilibrium pH value under a certain concentration and temperature, and the optimal preparation conditions of silver-loaded antibacterial zeolite (Ag-Z) were 323.15 K, 0.50 mol L -1, 6.20, 4.00 h for temperature, concentration, pH and time, respectively. And the silver-loading content of Ag-Z was as high as 365.73 mg g-1. The minimum inhibition concentrations (MICs) of the as prepared Ag-Z to Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) were as little as 1.00 μg ml-1 and 3.50 μg ml-1, respectively, and the minimum bactericidal concentrations (MBCs) were as little as 3.50 μg ml-1 and 5.00 μg ml-1, respectively. The antibacterial mechanisms were analyzed based on the quantity of released Ag + and Na+. © 2014 The Royal Society of Chemistry.


Liu H.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | Zhang S.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | Hu X.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | Chen C.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling
Environmental Pollution | Year: 2013

The effects of the ionic liquid 1-octyl-3-methylimidazolium chloride ([OMIM]Cl) was studied in hydroponically grown rice seedlings. Observed effects included increased root length and weight at concentrations of 0.1 mg/L [OMIM]Cl, however, as concentrations increased a reversed response was observed where roots and stems grew shorter and the weight decreased. The inhibitory concentration 50 (IC50,5d) values for root length and stem length were 0.59 mg/L and 0.70 mg/L, respectively. The Hill reaction activity and root system activity in [OMIM]Cl-treated rice seedlings were observed to be lower than the controls, however, root membrane permeability increased. The antioxidant enzyme activity in roots decreased, while in leaves there was an initial stimulation followed by a decrease. Malondialdehyde (MDA) content was found to be greater in seedlings subjected to [OMIM]Cl treatment. The cellular structures, such as chloroplasts, mitochondria and rough endoplasmic reticulum in rice root and leaf cells were affected at concentrations of 0.6 mg/L [OMIM]Cl. © 2013 Elsevier Ltd. All rights reserved.

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