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Thermal behaviors and heavy metal vaporization of phosphatized tannery sludge in incineration process

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Journal of Environmental Sciences 2008年第9期20卷 1146-1152页

作者： TANG, Ping ZHAO, Youcai XIA, Fengyi State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science and Engineering Tongji University Shanghai 200092 China Department of Life and Environmental Science Wenzhou University Wenzhou Zhejiang 325007 China

The high concentration of heavy metal (Cu, Cr, Zn, Pb) in tannery sludge causes severe heavy metal emissions in the process of incineration. In the present investigation, the tannery sludge was treated with 85% phosphoric acid before the incineration process in the tube furnace to control the heavy metal emissions. The thermal behavior and heavy metal vaporization of pre-treated tannery sludge were investigated, and X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis were also implemente...

关键词： tannery sludge thermal behavior heavy metal vaporization phosphatation

Transformation of ammonium nitrogen and response characteristics of nitrifying functional genes in tannery sludge contaminated soil

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Journal of Groundwater Science and Engineering 2022年第3期10卷 223-232页

作者： Xiang-ke Kong Zi-xuan Zhang Ping Wang Yan-yan Wang Zhao-ji Zhang Zhan-tao Han Li-sha Ma Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological SciencesShijiazhuang 050061China Key Laboratory of Groundwater Remediation of Hebei Province and China Geological Survey Shijiazhuang 050061China School of Water Resources and Environment China University of Geosciences(Beijing)Beijing 100083China Technical Centre for Soil Agriculture and Rural Ecology and EnvironmentMinistry of Ecology and EnvironmentBeijing 100012China

High concentrations of ammonium nitrogen released from tannery sludge during storage in open air may cause nitrogen pollution to soil and *** study the transformation mechanism of NH_(4)^(+)-N by nitrifying functional bacteria in tannery sludge contaminated soils,a series of contaminated soil culture experiments were conducted in this *** contents of ammonium nitrogen(as NH_(4)^(+)-N),nitrite nitrogen(as NO_(2)^(−)-N)and nitrate nitrogen(as NO_(3)^(−)-N)were analyzed during the culture period under different conditions of pollution load,soil particle and redox *** equation was used to interpret the change of NO_(3)^(−)-N with time in contaminated *** abundance variations of nitrifying functional genes(amoA and nxrA)were also detected using the real-time quantitative fluorescence PCR *** results show that the nitrification of NH_(4)^(+)-N was aggravated in the contaminated silt soil and fine sand under the condition of lower pollution load,finer particle size and more oxidizing *** sigmodial equation well fitted the dynamic accumulation curve of the NO_(3)^(−)-N content in the tannery sludge contaminated *** Cr(III)content increased with increasing pollution load,which inhibited the reproduction and activity of nitrifying bacteria in the soils,especially in coarse-grained *** accumulation of NO_(2)^(−)-N contents became more obvious with the increase of pollution load in the fine sand,and only 41.5%of the NH_(4)^(+)-N was transformed to NO_(3)^(−)-*** redox environment was the main factor affecting nitrification process in the *** to the aerobic soil environment,the transformation of NH_(4)^(+)-N was significantly inhibited under anaerobic incubation condition,and the NO_(3)^(−)-N contents decreased by 37.2%,61.9%and 91.9%under low,medium and high pollution loads,*** was stronger in the silt soil since its copy number of amoA and nxrA genes was two times larger t

关键词： tannery sludge Transformation of ammonium nitrogen Cr(III)aging Fluorescence quantitative PCR Functional gene

Immobilization of heavy metals in sludge using phosphoric acid and monobasic calcium phosphate

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第3期14卷 177-186页

作者： Ping TANG Yong-chao ZHOU Zhen-miao XIE College of Environment and Material Engineering Hangzhou Dianzi University College of Civil Engineering and Architecture Zhejiang University

The purpose of this research is to investigate the potential of pre-treatment with phosphoric acid(PA) and monobasic calcium phosphate(MCP) for the stabilization of heavy metals in sludge and its bottom *** tannery sludge samples were collected in Wenzhou,China and heavily contaminated with heavy metals,such as Pb,Cr and so *** samples were pre-treated with PA or *** XRD and TCLP tests were adopted as the evaluating methods to characterize the Pb,Cr,Cu,Zn and Cd immobilization in the pre-treated sludge and its bottom *** results showed that this treatment effectively immobilized Pb and Cd in the sludge,lightly stabilized the metal Cu,and adversely,enhanced the leachability of *** incineration at 900℃,Pb and Cr in the bottom ash of pre-treated sludge were significantly stabilized due to the formation of their highly thermostable phosphates and pyromorphite-like minerals during the incineration ***,an increase of Cu and Zn solubility was observed which might be attributable to the acidification of sludge due to the addition of PA or MCP.

关键词： tannery sludge Bottom ash Heavy metals Phosphate Stabilization

Environmental Factors Affecting Chromium-Manganese Oxidation-Reduction Reactions in Soil

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Pedosphere 2011年第1期21卷 84-89页

作者： D.O.P.TREBIEN L.BORTOLON M.J.TEDESCO C.A.BISSANI F.A.O.CAMARGO Department of Agricultural Engineering Federal University of Santa Catarina Department of Soil Science Federal University of Rio Grande do Sul

Disposal of chromium （Cr） hexavalent form, Cr（Ⅵ）, in soils as additions in organic fertilizers, liming materials or plant nutrient sources can be dangerous since Cr（Ⅵ） can be highly toxic to plants, animals, and humans. In order to explore soil conditions that lead to Cr（Ⅵ） generation, this study were performed using a Paleudult （Dystic Nitosol） from a region that has a high concentration of tannery operations in the Rio Crande do Sul State, southern Brazil. Three laboratory incubation experiments were carried out to examine the influences of soil moisture content and concentration of cobalt and organic matter additions on soil Cr（Ⅵ） formation and release and manganese （Mn） oxide reduction with a salt of chromium chloride （CrCl3） and tannery sludge as inorganic and organic sources of Cr（Ⅲ）, respectively. The amount of Cr（Ⅲ） oxidation depended on the concentration of easily reducible Mn oxides and the oxidation was more intense at the soil water contents in which Mn（Ⅲ/Ⅳ） oxides were more stable. Soluble organic compounds in soil decreased Cr（Ⅵ） formation due to Cr（Ⅲ） complexation. This mechanism also resulted in the decrease in the oxidation of Cr（Ⅲ） due to the tannery sludge additions. Chromium（Ⅲ） oxidation to Cr（Ⅵ） at the solid/solution interface involved the following mechanisms： the formation of a precursor complex on manganese （Mn） oxide surfaces, followed by electron transfer from Cr（Ⅲ） to Mn（Ⅲ or Ⅳ）, the formation of a successor complex with Mn（Ⅱ） and Cr（Ⅵ）, and the breakdown of the successor complex and release of Mn（Ⅱ） and Cr（Ⅵ） into the soil solution.

关键词： cobalt Cr(VI) oxidation Mn oxides soil moisture tannery sludge

Research progress on resource utilization of leather solid waste

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Journal of Leather Science and Engineering 2019年第1期1卷 68-84页

作者： Yanchun Li Ruijun Guo Wenhui Lu Deyi Zhu School of Light Industry and Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China

Leather making is the process of converting raw hides into *** of solid waste containing hazardous and high value components are generated during this ***,the elimination of the potential pollution and resource utilization of leather solid waste are the primary research ***,we comprehensively review the recent advances in the resource utilization of leather solid waste generated from chrome tanning including the utilization of tannery hair waste,untanned solid waste,chrome-containing leather solid waste,tannery sludge and finished leather waste,emphasizing on the general and novel utilization ***,the remaining challenges and perspectives were summarized,in order to accelerate the development of resource utilization of leather solid waste.

关键词： Leather solid waste tannery hair waste Untanned solid waste Chrome-containing leather solid waste tannery sludge Finished leather waste