Search results for: Qi-Tang Wu

Items from 1 to 20 out of 25 results

article

Combining potassium chloride leaching with vertical electrokinetics to remediate cadmium-contaminated soils

Qiang Ma, Jun Li, Charles C. C. Lee, Xinxian Long, more

Environmental Geochemistry and Health > 2019 > 41 > 5 > 2081-2091

This study evaluated the feasibility of combining potassium chloride (KCl) leaching and electrokinetic (EK) treatment for the remediation of cadmium (Cd) and other metals from contaminated soils. KCl leaching was compared at three concentrations (0.2%, 0.5%, and 1% KCl). EK treatment was conducted separately to migrate the metals in the topsoil to the subsoil. The combined approach using KCl leaching...

article

Shift of soil bacterial community and decrease of metals bioavailability after immobilization of a multi-metal contaminated acidic soil by inorganic-organic mixed amendments: A field study

Li-min Huang, Guang-wei Yu, Fu-zhen Zou, Xin-xian Long, more

Applied Soil Ecology > 2018 > 130 > C > 104-119

A field study was conducted to evaluate the effects of inorganic-organic mixed amendments on metals bioavailability and soil bacterial community structure by Illumina high-throughput sequencing technology. One year after the application of mixed amendments, the pH of the amended soils were 1.99–3.32 unit higher than the non-remediated soil, and the extractable Cd, Pb, Cu and Zn concentrations reduced...

article

Using a high biomass plant Pennisetum hydridum to phyto-treat fresh municipal sewage sludge

Liang Hei, Charles C.C. Lee, Hui Wang, Xiao-Yan Lin, more

Bioresource Technology > 2016 > 217 > C > 252-256

The study was carried out to investigate the use of a high biomass plant, Pennisetum hydridum, to treat municipal sewage sludge (MSS). An experiment composed of plots with four treatments, soil, fresh sludge, soil-sludge mixture and phyto-treated sludge, was conducted. It showed that the plant could not survive directly in fresh MSS when cultivated from stem cuttings. The experiment transplanting...

article

Feasibility of enhanced phytoextraction of Zn contaminated soil with Zn mobilizing and plant growth promoting endophytic bacteria

Xin-xian LONG, Xue-mei CHEN, Jonathan Woon-Chung WONG, Ze-bin WEI, more

Transactions of Nonferrous Metals Society of China > 2013 > 23 > 8 > 2389-2396

Three bacterial endophytes of Sedum alfredii, VI ₈ L ₂ , II ₈ L ₄ and VI ₈ R ₂ , were examined for promoting soil Zn bioavailability and Zn accumulation in S. alfredii. Results showed that three strains were re-introduced into S. alfredii rhizosphere soils under Zn stress and resulted in better plant growth, as roots biomass increased from 80% to 525%...

chapter

Effects of Mixed Chelators on the Leaching of Zinc in Contaminated Soils under the Co-planting System

Jian-Li Zhou, Qi-Tang Wu, Ze-Bin Wei, Xiao-Fang Guo, more

2013 Third International Conference on Intelligent System Design and Engineering Applications > 682 - 687

2013 Third International Conference on Intelligent System Design and Engineering Applications (ISDEA)

To study the influence of mixed chelators (MC) on Zn leaching in two contaminated soil (acid soil with pH 4.63 and neutral soil with pH 6.51) with Pb-Zn mining wastewater under the co-planting system, a outdoor soil column (100 cm) leaching experiment was conducted with three treatments as follows: without plants and without MC (CK), co-planting of S. alfredii and Z. mays without MC (CP), and co-planting...

article

Effect of composting on the removal of semivolatile organic chemicals (SVOCs) from sewage sludge

Quan-Ying Cai, Ce-Hui Mo, Huixiong Lü, Qiao-Yun Zeng, more

Bioresource Technology > 2012 > 126 > Complete > 453-457

In order to investigate the occurrence and removal of semivolatile organic chemicals (SVOCs) in the compost of sewage sludge, three different composting treatments, including manual turned compost (MTC), intermittent aerated compost (IAC), and naturally aerated compost (NAC) were conducted. Thirty SVOCs in composts were Soxhlet-extracted and analyzed by GC/MS. After 56days of composting, the total...

article

Designing Cropping Systems for Metal-Contaminated Sites: A Review

Ye-Tao TANG, Teng-Hao-Bo DENG, Qi-Hang WU, Shi-Zhong WANG, more

Pedosphere > 2012 > 22 > 4 > 470-488

Considering that even contaminated soils are a potential resource for agricultural production, it is essential to develop a set of cropping systems to allow a safe and sustainable agriculture on contaminated lands while avoiding any transfer of toxic trace elements to the food chain. In this review, three main strategies, i.e., phytoexclusion, phytostabilization, and phytoextraction, are proposed...

article

Cadmium and Zinc Accumulation in Maize Grain as Affected by Cultivars and Chemical Fixation Amendments

Xiao-Fang GUO, Ze-Bin WEI, Qi-Tang WU, Jin-Rong QIU, more

Pedosphere > 2011 > 21 > 5 > 650-656

A field experiment was conducted to investigate the effects of soil amendments (lime, nano-Si foliar solution and used diatomite) on the growth and metal uptake of three maize (Zea mays L.) cultivars grown in a Cd and Zn-contaminated acidic soil. The addition of lime significantly increased the maize grain yields and decreased the concentrations of Zn and Cd in the grains and shoots of maize when...

article

Co-planting can phytoextract similar amounts of cadmium and zinc to mono-cropping from contaminated soils

Cheng-ai Jiang, Qi-Tang Wu, Thibault Sterckeman, Christophe Schwartz, more

Ecological Engineering > 2010 > 36 > 4 > 391-395

Co-planting crops normally decreases the main crop yield due to the reduced soil surface area occupied by the main crop. However, in our previous experiments, co-planting Sedum alfredii, a shade-requiring, Cd and Zn-hyperaccumulating plant, with corn increased the biomass and metal phytoextraction of S. alfredii. This experiment was conducted to verify if co-planting another hyperaccumulator, Thlaspi...

article

Polycyclic Aromatic Hydrocarbons and Phthalic Acid Esters in Vegetables from Nine Farms of the Pearl River Delta, South China

Ce-Hui Mo, Quan-Ying Cai, Shi-Rong Tang, Qiao-Yun Zeng, more

Archives of Environmental Contamination and Toxicology > 2009 > 56 > 2 > 181-189

This study investigated the occurrence of 16 polycyclic aromatic hydrocarbons (PAHs) and 6 phthalic acid esters (PAEs) in 11 vegetable species collected from nine farms of the Pearl River Delta, South China. Twelve PAH compounds and all PAE compounds were detected by gas chromatography coupled with mass spectrometry (GC-MS) in vegetables. The total concentrations of PAHs (Σ_PAHs) and PAEs (Σ_PAEs) ranged...

article

Potential of Ipomoea aquatica cultivars in phytoremediation of soils contaminated with di-n-butyl phthalate

Quan-Ying Cai, Ce-Hui Mo, Qiao-Yun Zeng, Qi-Tang Wu, more

Environmental and Experimental Botany > 2008 > 62 > 3 > 205-211

Five different genotypic cultivars of Ipomoea aquatica commonly grown in Southeast Asia were cultivated to investigate their accumulation variation of di-n-butyl phthalate (DBP) and their potential for phytoremediation of three soils contaminated with DBP (4.5, 10.3 and 22.5mgkg ⁻¹ ). The results indicated different cultivar tolerance to DBP. DBP concentration in the shoots of the cultivars...

article

Polycyclic aromatic hydrocarbons and phthalic acid esters in the soil–radish (Raphanus sativus) system with sewage sludge and compost application

Quan-Ying Cai, Ce-Hui Mo, Qi-Tang Wu, Qiao-Yun Zeng

Bioresource Technology > 2008 > 99 > 6 > 1830-1836

We studied the accumulation of polycyclic aromatic hydrocarbons (PAHs) and phthalic acid esters (PAEs) in a latosolic red soil and radish (Raphanus sativus) with application of sewage sludge at rates of 10, 20 and 40gkg ⁻¹ soil or compost at rate of 10gkg ⁻¹ soil. In radish the concentrations of individual PAHs and PAEs varied from non-detectable to 803μgkg ⁻¹ dry weight (d...

article

Nitrogen and Phosphorus Runoff Losses from Orchard Soils in South China as Affected by Fertilization Depths and Rates

Shu-Cai ZENG, Zhi-Yao SU, Bei-Guang CHEN, Qi-Tang WU, more

Pedosphere > 2008 > 18 > 1 > 45-53

Fertilizers are heavily applied in orchards of the hilly and mountainous topography of South China and may increase nutrient loadings to receiving waters. A simple runoff collecting system was used to measure the effects of different fertilization treatments on total N and P concentrations of surface runoff in a Chinese chestnut (Castanea mollissima Blume) orchard in Dongyuan County, Guangdong Province,...

article

The status of soil contamination by semivolatile organic chemicals (SVOCs) in China: A review

Quan-Ying Cai, Ce-Hui Mo, Qi-Tang Wu, Athanasios Katsoyiannis, more

Science of the Total Environment > 2008 > 389 > 2-3 > 209-224

This paper summarizes the published scientific data on the soil contamination by semivolatile organic chemicals (SVOCs) in China. Data has been found for more than 150 organic compounds which were grouped into six classes, namely, polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), polychlorinated biphenyls (PCBs), organochlorine pesticides (OCPs), polycyclic aromatic hydrocarbons (PAHs),...

article

Concentration and speciation of heavy metals in six different sewage sludge-composts

Quan-Ying Cai, Ce-Hui Mo, Qi-Tang Wu, Qiao-Yun Zeng, more

Journal of Hazardous Materials > 2007 > 147 > 3 > 1063-1072

This study presents the concentrations and speciation of heavy metals (HMs) in six different composts of sewage sludges deriving from two wastewater treatment plants in China. After 56 days of sludge composting with rice straw at a low C/N ratio (13:1), cadmium (Cd), copper (Cu), lead (Pb) and zinc (Zn) were enriched in sludge composts, exhibiting concentrations that varied from 0.75 to 2.0, 416 to...

article

Co-cropping for phyto-separation of zinc and potassium from sewage sludge

Qi-Tang Wu, Liang Hei, J.W.C. Wong, Christophe Schwartz, more

Chemosphere > 2007 > 68 > 10 > 1954-1960

The use of sewage sludge as a fertilizer and soil amendment has resulted in high concentrations of heavy metals in the soil limiting its use. The present study was carried out to find the possibility of phyto-separating toxic and beneficial elements from the sludge using suitable plants. Of the five plants tested the hyperaccumulator Sedum alfredii H achieved the greatest removal of Zn, while shoots...

article

Occurrence of organic contaminants in sewage sludges from eleven wastewater treatment plants, China

Quan-Ying Cai, Ce-Hui Mo, Qi-Tang Wu, Qiao-Yun Zeng, more

Chemosphere > 2007 > 68 > 9 > 1751-1762

This study presents the occurrence of 43 semi-volatile organic compounds (SVOCs) listed as priority pollutants by both China and the United States Environmental Protection Agency, in sewage sludges collected from eleven wastewater treatment plants (WWTPs) of mainland and Hong Kong, China. Thirty-six SVOCs were detected by gas chromatography coupled with mass spectrometer (GC–MS) and at least 14 in...

article

Chemical Composition of Root and Stem Saps in Relation to Cadmium Resistance and Accumulation in Brassica parachinensis1 1 Project supported by the National Natural Science Foundation of China (No. 40571141) and the Natural Science Foundation of Guangdong Province (No. 021007) and the Key Teachers Foundation of the Ministry of Education of China (No. 2000-143-39).

Qi-Tang WU, Zhao-Li XU, Hui YE, J.W.C. WONG

Pedosphere > 2007 > 17 > 3 > 352-359

Sap mixtures of the xylem, phloem, and vacuoles from low and high Cd accumulator varieties of Brassica parachinensis L. H. Bailey were analyzed under Cd stress to understand the biochemical mechanisms of Cd accumulation in plants. Low Cd accumulator (‘Teqing-60’) and high Cd accumulator (‘Chixin-2’) plants were grown in Cd-treated soil in pots in a greenhouse. Percentage of cell wall-bound Cd was...

article

Occurrence and assessment of polycyclic aromatic hydrocarbons in soils from vegetable fields of the Pearl River Delta, South China

Quan-Ying Cai, Ce-Hui Mo, Yun-Hui Li, Qiao-Yun Zeng, more

Chemosphere > 2007 > 68 > 1 > 159-168

Surface soil (0–20cm) samples from nine representative vegetable fields located in Guangzhou, Shenzhen, Zengcheng and Huadu within the Pearl River Delta, South China were collected and analyzed for 16 USEPA priority polycyclic aromatic hydrocarbons (PAHs) using gas chromatography coupled to mass spectrometry (GC–MS). Total concentrations of 16 PAHs (Σ _PAHs ) ranged from 160 to 3700μgkg ...

article

Bioremediation of polycyclic aromatic hydrocarbons (PAHs)-contaminated sewage sludge by different composting processes

Quan-Ying Cai, Ce-Hui Mo, Qi-Tang Wu, Qiao-Yun Zeng, more

Journal of Hazardous Materials > 2007 > 142 > 1-2 > 535-542

The efficiency of four different composting processes to bioremediate polycyclic aromatic hydrocarbons (PAHs)-contaminated sewage sludge was investigated. Prior to composting, sewage sludge coming from the Datansha wastewater treatment plant, Guangzhou, China, was mixed with rice straw to obtain a C/N ratio of 13:1. After 56 days of composting, the total concentrations of 16 PAHs (Σ _PAHs )...

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Search results for: Qi-Tang Wu

Combining potassium chloride leaching with vertical electrokinetics to remediate cadmium-contaminated soils

Shift of soil bacterial community and decrease of metals bioavailability after immobilization of a multi-metal contaminated acidic soil by inorganic-organic mixed amendments: A field study

Using a high biomass plant Pennisetum hydridum to phyto-treat fresh municipal sewage sludge

Feasibility of enhanced phytoextraction of Zn contaminated soil with Zn mobilizing and plant growth promoting endophytic bacteria

Effects of Mixed Chelators on the Leaching of Zinc in Contaminated Soils under the Co-planting System

Effect of composting on the removal of semivolatile organic chemicals (SVOCs) from sewage sludge

Designing Cropping Systems for Metal-Contaminated Sites: A Review

Cadmium and Zinc Accumulation in Maize Grain as Affected by Cultivars and Chemical Fixation Amendments

Co-planting can phytoextract similar amounts of cadmium and zinc to mono-cropping from contaminated soils

Polycyclic Aromatic Hydrocarbons and Phthalic Acid Esters in Vegetables from Nine Farms of the Pearl River Delta, South China

Potential of Ipomoea aquatica cultivars in phytoremediation of soils contaminated with di-n-butyl phthalate

Polycyclic aromatic hydrocarbons and phthalic acid esters in the soil–radish (Raphanus sativus) system with sewage sludge and compost application

Nitrogen and Phosphorus Runoff Losses from Orchard Soils in South China as Affected by Fertilization Depths and Rates

The status of soil contamination by semivolatile organic chemicals (SVOCs) in China: A review

Concentration and speciation of heavy metals in six different sewage sludge-composts

Co-cropping for phyto-separation of zinc and potassium from sewage sludge

Occurrence of organic contaminants in sewage sludges from eleven wastewater treatment plants, China

Occurrence and assessment of polycyclic aromatic hydrocarbons in soils from vegetable fields of the Pearl River Delta, South China

Bioremediation of polycyclic aromatic hydrocarbons (PAHs)-contaminated sewage sludge by different composting processes

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