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Effects of bacterially produced precipitates on the metabolism of sulfate reducing bacteria during the bio-treatment process of copper-containing wastewater

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Science China Chemistry 2010年第12期53卷 2608-2615页

作者： sheng yuxing,cao hongbin,li yuping & zhang yi national engineering laboratory for hydrometallurgical cleaner production technology Key laboratory of Green Process and engineering,Institute of Process engineering,Chinese Academy of Sciences,Beijing 100190,China national engineering laboratory for hydrometallurgical cleaner production technology Key laboratory of Green Process and engineering Institute of Process Engineering Chinese Academy of Sciences Beijing China

A large volume of bacterially produced precipitates are generated during the bio-treatment of heavy metal *** composition of the bacterially produced precipitates and its effects on sulfate reducing bacteria (SRB) in copper-containing waste stream were evaluated in this *** elemental composition of the microbial precipitate was studied using electrodispersive X-ray spectroscopy (EDX),and it was found that the ratio of S:Cu was *** with the results of copper distribution in the SRB metabolism culture,which was analyzed by the sequential extraction procedure,copper in the precipitates was determined as covellite (CuS).The bacterially produced precipitates caused a decrease of the sulfate reduction rate,and the more precipitates were generated,the lower the sulfate reduction rate *** particle sizes of bacterially generated covellite were ranging from 0.03 to 2 m by particles size distribution (PSD) analysis,which was smaller than that of the SRB *** electron microscopy (TEM) analysis showed that the microbial covellite was deposited on the surface of the *** effects of the microbial precipitate on SRB metabolism were found to be weakened by increasing the precipitation time and adding microbial polymeric substances in later *** results provided direct evidence that the SRB activity was inhibited by the bacterially produced covellite,which enveloped the bacterium and thus affected the metabolism of SRB on mass transfer.

关键词： sulfate reducing bacteria covellite heavy metal wastewater

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Effects of sulfide on sulfate reducing bacteria in response to Cu(II), Hg(II) and Cr(VI) toxicity

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Chinese Science Bulletin 2011年第9期56卷 862-868页

作者： sheng yuxing cao hongbin li yuping zhang yi national engineering laboratory for hydrometallurgical cleaner production technology Beijing 100190China Key laboratory of Green Process and engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

Sulfate reducing bacteria (SRB) is identified as the primary organisms responsible for the treatment of heavy metal wastewater. However, most heavy metals can inhibit the growth of SRB during heavy metal treatment processes. Sulfide is a metabolic product of SRB and it can precipitate or reduce heavy metals. This study focused on the effects of sulfide on SRB resistance to Cu(II), Hg(I) and Cr(VI) toxicity. First, we considered the existence style of various heavy metals with and without sulfide addition by sequential extraction experiments. Second, the particle size distribution was evaluated and the cell structure during the metabolism of a SRB culture, containing different heavy metals, was analyzed by particle size distribution and TEM analyses. Third, the evolution of sulfate under the influence of different concentrations of heavy metals with and without sulfide addition was investigated to evaluate SRB activity. The results indicated that sulfide played an important role in alleviating and even eliminating the toxicity of Cu(II), Hg(II) and Cr(VI). We also discuss the mechanism of sulfide on SRB resistance to Cu(II), Hg(I) and Cr(VI) toxicity.

关键词：硫酸盐还原菌 Cr(VI) 汞毒性硫化铜金属硫化物铬(VI) 作者废水生物处理

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Comparison of Mg^(2+)- and Ca^(2+)-enhancing anaerobic granulation in an expanded granular sludge-bed reactor

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Science China Chemistry 2014年第11期57卷 1596-1601页

作者： cao XiaoLei sheng yuxing cao hongbin zhang yi national Key laboratory of Biochemical engineering and Key laboratory of Green Process and engineering Institute of Process Engineering Chinese Academy of Sciences national engineering laboratory for hydrometallurgical cleaner production technology Graduate University of Chinese Academy of Sciences

The mechanisms responsible for the fast granulation of anaerobic sludge caused by Mg2+ and Ca2+ addition was examined in four lab-scale expanded granular sludge bed(EGSB) reactors. Results indicated that both Mg2+ and Ca2+ accelerated the sludge-granulation process and increased the amount of polysaccharides and proteins in the sludge. Energy dispersive x-ray spectrometry(EDX) analysis revealed that, in a mature granule, both Mg2+ and Ca2+ composed as phosphate and calcium was distributed primarily in the periphery of the granule, while magnesium distributed mainly in the interior. The addition of Mg2+ was more favorable for the nuclei formation, whereas the addition of Ca2+ was more favorable for subgranule growth and maintaining the granules' rigid structure. Results showed that the addition of Mg2+ in the nuclei formation stage and Ca2+ in the granule-growth stage accelerated granulation more than adding only one of them in the granulation process.

关键词： anaerobic granulation Ca2+ augmentation EPS Mg2+ augmentation

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Heterogeneous Fenton-like degradation of 4-chlorophenol using iron/ordered mesoporous carbon catalyst

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Journal of Environmental Sciences 2014年第5期26卷 1171-1179页

作者： Feng Duan Yuezhu Yang yuping li hongbin cao yi Wang yi zhang national engineering laboratory for hydrometallurgical cleaner production technology Key laboratory of Green Process and engineering Institute of Process Engineering Chinese Academy of Sciences School of Chemical and Biological engineering Changsha University of Science and Technology

Ordered mesoporous carbon supported iron catalysts （Fe/OMC） were prepared by the incipient wetness impregnation method and investigated in Fenton-like degradation of 4-chlorophenol （4CP） in this work. XRD and TEM characterization showed that the iron oxides were well dispersed on the OMC support and grew bigger with the increasing calcination temperature. The catalyst prepared with a lower calcination temperature showed higher decomposition efficiency towards 4CP and H202, but more metals were leached. The effect of different operational parameters such as initial pH, H202 dosage, and reaction temperature on the catalytic activity was evaluated. The results showed that 96.1% of 4CP and 47.4% of TOC was removed after 270 min at 30℃, initial pH of 3 and 6.6 mmol/L H202.88% of 4CP removal efficiency was retained after three successive runs, indicating Fe/OMC a stable catalyst for Fenton reaction. 4CP was degraded predominately by the attack of hydroxyl radical formed on the catalyst surface and in the bulk solution due to iron leaching. Based on the degradation intermediates detected by high performance liquid chromatography, possible oxidation pathways were proposed during the 4CP degradation.

关键词： ordered mesoporous carbon calcination temperature hydrogen peroxide hydroxyl radical heterogeneous Fenton

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Whole-Process Pollution Control for Cost-Effective and cleaner Chemical production A Case Study of the Tungsten Industry in China

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engineering 2019年第4期5卷 768-776页

作者： hongbin cao He Zhao Di zhang Chenming liu Xiao lin yuping li Pengge Ning Jiajun Sun yi zhang Zhi Sun Beijing engineering Research Center of Process Pollution Control and national engineering laboratory for hydrometallurgical cleaner production technology Division of Environment Technology and EngineeringInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China

In this research,a methodology named whole-process pollution control(WPPC)is demonstrated that improves the effectiveness of process *** methodology considers waste/emission treatment as a step of the whole production process with respect to the minimization of cost and environmental impact for the whole *** following procedures are introduced in a WPPC process optimization:①a material and energy flow investigation and optimization based on a systematic understanding of the distribution and physiochemical properties of potential pollutants;②a process optimization to increase the utilization efficiency of different elements and minimize pollutant emissions;and③an evaluation to reveal the effectiveness of the optimization *** production of ammonium paratungstate was chosen for the case *** factors of the different optimization schemes-namely the cost-effectiveness factor and the environmental impact indicator-were evaluated and *** research demonstrates that by considering the nature of potential pollutants,technological innovations,economic viability,environmental impacts,and regulation requirements,WPPC can efficiently optimize a metal production process.

关键词： Whole-process pollution control Process optimization Industrial pollution Tungsten

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A novel process for the recovery of iron,titanium,and vanadium from vanadium-bearing titanomagnetite:sodium modification–direct reduction coupled process

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International Journal of Minerals,Metallurgy and Materials 2017年第5期24卷 504-511页

作者： yi-min zhang ling-yun yi li-na Wang De-sheng Chen Wei-jing Wang Ya-hui liu Hong-xin Zhao Tao Qi University of Chinese Academy of Sciences national engineering laboratory for hydrometallurgical cleaner production technology Key laboratory of Green Process and engineering Institute of Process EngineeringChinese Academy of Sciences

A sodium modification–direct reduction coupled process was proposed for the simultaneous extraction of V and Fe from vanadium- bearing titanomagnetite. The sodium oxidation of vanadium oxides to water-soluble sodium vanadate and the transformation of iron oxides to metallic iron were accomplished in a single-step high-temperature process. The increase in roasting temperature favors the reduction of iron oxides but disfavors the oxidation of vanadium oxides. The recoveries of vanadium, iron, and titanium reached 84.52%, 89.37%, and 95.59%, respectively. Moreover, the acid decomposition efficiency of titanium slag reached 96.45%. Compared with traditional processes, the novel process provides several advantages, including a shorter flow, a lower energy consumption, and a higher utilization efficiency of vanadium-bearing titanomagnetite resources. © 2017, University of Science and technology Beijing and Springer-Verlag Berlin Heidelberg.

关键词： Energy utilization Iron Leaching Magnetic separation Metal recovery Metallic compounds Oxides Slags Sodium Titanium Vanadium

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A method for recovery of iron,titanium,and vanadium from vanadium-bearing titanomagnetite

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International Journal of Minerals,Metallurgy and Materials 2018年第2期25卷 131-144页

作者： yi-min zhang li-na Wang De-sheng Chen Wei-jing Wang Ya-hui liu Hong-xin Zhao Tao Qi University of Chinese Academy of Sciences Beijing 100049China national engineering laboratory for hydrometallurgical cleaner production technology Beijing 100190China Key laboratory of Green Process and engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

An innovative method for recovering valuable elements from vanadium-bearing titanomagnetite is proposed. This method involves two procedures： low-temperature roasting of vanadium-bearing titanomagnetite and water leaching of roasting slag. During the roasting process, the reduction of iron oxides to metallic iron, the sodium oxidation of vanadium oxides to water-soluble sodium vanadate, and the smelting separation of metallic iron and slag were accomplished simultaneously. Optimal roasting conditions for iron/slag separation were achieved with a mixture thickness of 42.5 mm, a roasting temperature of 1200°C, a residence time of 2 h, a molar ratio of C/O of 1.7, and a sodium carbonate addition of 70 wt%, as well as with the use of anthracite as a reductant. Under the optimal conditions, 93.67% iron from the raw ore was recovered in the form of iron nugget with 95.44% iron grade. After a water leaching process, 85.61% of the vanadium from the roasting slag was leached, confirming the sodium oxidation of most of the vanadium oxides to water-soluble sodium vanadate during the roasting process. The total recoveries of iron, vanadium, and titanium were 93.67%, 72.68%, and 99.72%, respectively.

关键词： recovery vanadium titanomagnetite direct reduction sodium oxidation smelting separation water leaching

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