Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology

Guilin, China

Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology

Guilin, China
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Gan L.,Guilin University of Technology | Gan L.,Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology | Gan L.,CAS Nanjing Institute of Soil Science | Gan L.,University of Kiel | And 3 more authors.
Soil Science | Year: 2013

To better understand the effects of different grazing intensities on soil-water dynamics and its budget in Inner Mongalia, China, five sites, under two representative vegetation types, Leymus chinensis (LC) and Stipa grandis (SG), were investigated: ungrazed sites since 1979, LCUG79 and SGUG79, a winter grazed site (LCWG), a continuously grazed site (SGCG) defined as a moderate grazing intensity, and a heavily grazed site (LCHG). Soil, plant, and meteorological data were collected for use in modeling soil-water content and its budget during growing seasons from 2008 to 2009 using the HYDRUS-1D. The soil-water content in 2010 was simulated using annually averaged values of initial and boundary conditions. Our results showed that grazing reduced total pores and saturated hydraulic conductivity but ungrazed sites benefited from natural recovery. Greater transpiration was observed at the SGCG site when compared with the LCWG and LCHG sites. At the two ungrazed sites, transpiration was greater in the SG region as compared with the LC region. Rainfall reduced the difference between potential and actual evapotranspiration through increasing plant-available water. The simulation of soil water in 2010 using annually averaged parameters was determined to be an acceptable alternative to actual on-site observation. Our data suggest that selection of an appropriate grazing intensity may be possible via simulation modeling for use in making land management decision, especially in the absence of on-site observations as often is the case from such remote regions. Copyright © 2013 by Lippincott Williams & Wilkins.


Liu B.,Chongqing University | Liu B.,Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology | Peng X.Y.,Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology | Zhao H.,Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology | Tian Q.,Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology
Applied Mechanics and Materials | Year: 2014

The biodegradability of aged landfill leachate is low, and the treatment effects of common processes are very poor. This paper explored the effects of the "Ultrasound/Ultraviolet - Aged Refuse Bioreactor" combined process on aged landfill leachate. The main results were as follows: {Circled digit one} The optimum power of ultrasound was 100 W, and the optimum wavelength of ultraviolet was 254 nm. The removal rate of COD was 27.33% and the value of BOD/COD ratio was increased from 0.1 to 0.35 after the treatment of Ultrasound/Ultraviolet process. Therefore, the biodegradability of the leachate was improved, which might meet the demand of subsequent biological treatment. {Circled Digit two} The COD removal rates of the two-stage series aged refuse bioreactor were both kept above 50% during the experiment and this process had a strong capacity of resistance to impact load. {Circled digit three} The COD removal rate of the combined process was over 80% as a whole without any pretreatment, and it has positive significance for the treatment of aged leachate. © (2014) Trans Tech Publications, Switzerland.


Liu B.,Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology | Liu B.,Chongqing University | Peng X.Y.,Chongqing University | Tian Q.,Chongqing University | Zhao H.,Chongqing University
Applied Mechanics and Materials | Year: 2014

Landfill leachate treatment is a major problem to be solved in the field of environmental protection, and ammonia nitrogen is one of the major pollutants in landfill leachate, whose processing technology needs further improvement. In this paper, ultrasound/ultraviolet co-oxidation technology was directly applied to the treatment of high concentration landfill leachate without the pretreatment operations of dilution, filter, and adjusting the pH conditions. The results showed that: ultrasonic and ultraviolet had certain effects on the ammonia nitrogen removal, and the ammonia nitrogen removing effects became better when the ultrasonic power was greater, or the ultraviolet wavelength was shorter. When the ultrasonic power was 100 W, the ammonia nitrogen removal efficiency was 25.2%, and the UV of 254 nm could decompose 20.2% of the ammonia nitrogen in landfill leathate. In the condition of aeration, ultrasonic and ultraviolet had good synergistic effect on leachate ammonia nitrogen treatment. When the ultrasonic power was 100 W, UV wavelength was 254 nm, and the aeration rate was 150 L/h, the ammonia removal efficiency of high concentration leachate (ammonia nitrogen concentration of 1800 mg/L) reached 98.5% after 6 hours. The paper's research results provide a useful reference for the removal of landfill leachate ammonia nitrogen. © (2014) Trans Tech Publications, Switzerland.


Wu X.,Guilin University of Technology | Wu X.,Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology | Zhang J.,Guilin University of Technology | Zhang J.,Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology | And 2 more authors.
Chinese Journal of Environmental Engineering | Year: 2015

Bioleaching experiments of sewage sludge were carried out in three 80 L SBR bioreactors. The contents of Zn, Cu in EPS were analyzed, and the transformation of chemical forms of Zn and Cu was researched. The results showed that the total concentration of Zn and Cu in EPS increased firstly and then decreased. The adsorption ability of LB-EPS to Zn and Cu was better than that of TB-EPS. Based on the total contents of Cu and Zn in EPS of bioleached sludge, the highest content percentages of Zn and Cu in TB were 39.95% and 58.77%, respectively. Most of Zn existed as Fe-Mn oxide form in the raw sludge, while Cu existed as the organic combination form. Residual form was the major speciation for both Zn and Cu in bioleached sludge. ©, 2015, Science Press. All right reserved.


Li H.,Guilin University of Technology | Xie Q.,Guilin University of Technology | Xie Q.,Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology | Chen N.,Guilin University of Technology | And 2 more authors.
Key Engineering Materials | Year: 2016

Pollution of heavy metals has become a serious environmental problem and it needs to be solved as soon as possible. Diatomite is a kind of biogenic rock and it is siliceous and sedimentary. There is abundant diatomite resource in China. Diatomite has distinctive structure of diatom monoblock. It has strong adsorbability, its specific area is large and it has high porosity. Its surface adheres a lot of active groups and negative charge. Diatomite with proper modification would show outstanding absorption effect of heavy metal ions. This paper reviewed the absorption efficiency of heavy metal ions on diatomite modified by metallic oxide, acids and bases, acticarbon, calcium carbonate and organics, the results would offer references for related researches. At last, this paper takes the outlook for the modified methods and application prospects of diatomite in wastewater treatment of heavy metals. © 2016 Trans Tech Publications, Switzerland.


Song B.,Guilin University of Technology | Song B.,Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology | Zeng W.,Guilin University of Technology
Chinese Journal of Environmental Engineering | Year: 2016

The transform and stabilization process of external lead in red and gray soil of southern part of China were studied through 60 days of soil incubation. The results show that after the additions of high concentrations of external lead, soil available Pb showed a tendency of decrease at first and stable at last during soil incubation and soil DTPA-Pb showed a stable trend during the first 30 days. The results of the Form-BAC risk evaluation method show that the concentrations of Pb significantly decreased in the exchangeable and carbonate fractions lowering the risk of human health and ecology in tested soil under natural conditions, and provide the scientific basis for the engineering application of remediation of lead contaminated soil. © 2016, Science Press. All right reserved.


Wu X.H.,Guilin University of Technology | Wu X.H.,Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology | Zhang J.,Guilin University of Technology
Applied Mechanics and Materials | Year: 2014

overmuch heavy metal is one major restrictive factor for land application of sewage sludge. The environmental behavior of heavy metals depends strongly on their specific chemical fraction or binding state in sludge. The present paper gives an overview of recent researches about the chemical speciation of heavy metals in sludge. A detailed discussion was also made on the various problems associated with the distribution of chemical fractions of heavy metals in sewage sludge, which need to be addressed while exploring more efficient treatment of removing heavy metal. © (2014) Trans Tech Publications, Switzerland.


Zeng L.,East China University of Science and Technology | Zhang H.,East China University of Science and Technology | Zhang H.,Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology | Mo M.,Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology | And 2 more authors.
Chinese Journal of Environmental Engineering | Year: 2016

In this study, chestnut shell modified by citric acid was used as adsorbent to remover Cr(III) from aqueous solution. Effects of various parameters, including the pH, the dose of adsorbent, the initial metal concentration, models for adsorption isothermal process and adsorption kinetics/thermodynamic were investigated to determine the optimal conditions for Cr(III) removal. The result indicated that under the conditions of pH 4.0 and modified chestnut shell dosage of 1 g/L, adsorption capacities of CACS reached 33.4 mg/g. Compared with the unmodified chestnut shell CS, adsorption capacity of CACS on Cr(III) increased by 49.5%. The adsorption process could be fitted with the pseudo-second kinetic model and isothermal adsorption behavior can be described by Langmuir equation, which implying that the adsorption rate was controlled by chemical adsorption and surface adsorption occurred. Based on the FTIR and SEM spectrum, it is found that surface adsorption, electrostatic attraction, complexation and ion exchange between the CACS and Cr(III) contributed to the adsorption, the main reason for improving the Cr(III) adsorption quantity by CACS may be the coordination effect between hydroxyl, carboxylic groups and Cr(III). © 2016, Science Press. All right reserved.


Yang B.W.,Guilin University of Technology | Yang B.W.,Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology | Zhang J.,Guilin University of Technology | Zhang J.,Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology
Applied Mechanics and Materials | Year: 2014

As one of major environmental endocrine disruptors (EEDs), bisphenol A (BPA) has been drawn increasingly lots of people in the world, which is also widely identified as an indispensable raw chemical in plastics production, food cans and dental composites. With increasing demand and production capacity of BPA, more BPA will enter into and contaminate the environment. So it has become a challenge that excess BPA jeopardizes the health of human being. Considering a pretty low dose of BPA existing in the environment, some advanced analysis techniques have been carried out to analysis BPA, such as HLPC, GC-MS, LC-MS. Compared with other physical and chemical treatment technology, biological treatment technology has the advantage of low cost and high efficiency. © (2014) Trans Tech Publications, Switzerland.


Song B.,Guilin University of Technology | Song B.,Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology | Zeng W.,Guilin University of Technology | Lu S.,Guilin University of Technology | Yu Y.,Guilin University of Technology
Chinese Journal of Environmental Engineering | Year: 2015

As a scattered toxic metal and not a essential elements of organisms in the world, low concentration of lead is insidious with negative health effects on individuals, particularly pre-school aged children. Lead phytotoxicity is closely related to lead bioavailability. How to reduce lead bioavailability is an important key of lead-contaminated soil remediation. The use of phosphate as a stabilizing agent that is widely accepted and capable of lead-contaminated soil remediation. The principal mechanism of Pb stabilization by different types of phosphorus materials through adsorption, precipitation, ion exchange action with Pb2+ to form highly insoluble mineral pyromorphite [Pb5(PO4)3X; X=F, Cl, Br or OH]. Phosphorus materials are present: calcium dihydrogen phosphate (Ca(H2PO4)2·H2O), calcium hydrogen phosphate (CaHPO4), sodium phosphate (Na3PO4), hydroxyl apatite (hydroxyapatite), orthophosphate (orthophosphate), phosphate rock (phosphate rock), superphosphate (single-superphosphate) and a mixture of hydroxyapatite and calcium phosphate. This review article comprehensively discusses the background, concepts and the phosphorus materials molecular mechanism of lead-contaminated soil, effects on impact factors of the remediation and outlines the future trends in application of phosphorus materials in remediation of lead-contaminated soil. © 2015, Science Press. All right reserved.

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