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Comparison of Bioleaching of Heavy Metals from sewage sludge of Different Solid Concentrations Using Two Inocula

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Agricultural Science & Technology 2017年第12期18卷 2415-2418页

作者： Guiqun PENG Ziqiang AO Shunbao LU Institute of Energy Research Jiangxi Academy of SciencesNanchang 310096China Jiangxi Normal University Nanchang 310096China

Two 10%(v/v) different inocula, iron-oxidizing bacteria and sulfur-oxidizing bacteria, were used to investigate the bioleaching of heavy metals from sewage sludge with 10-40 g/L sludge concentration in the batch experiment. The results demonstrated that most of bioleaching rates of Zn and Cu achieved above 80% and 60%, respectively, after 12 d in the sludge with different concentrations and inocula. The lower the solid concentration, the higher the removal rate of heavy metals and the quicker the removal speed in sludge. The system with iron-oxidizing bacteria had faster startup speed and was influenced by solid concentration lightly, while in the system with sulfur-oxidizing bacteria, the removal efficiency was affected by concentration seriously.

关键词： sewage sludge Heavy metals Bioleaching Solid concentration Thiobacillus

Effects of Microbial Inoculants from sewage sludge on Initial Growth of Festuca arundinacea L.

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Agricultural Biotechnology 2014年第2期3卷 58-62页

作者： Zhixu WANG Shulan ZHAO Li'an DUO Tianjin Key Laboratory of Animal and Plant Resistance College of Life SciencesTianjin Normal University

Microbial inoculants were isolated from sewage sludge and applied to turfgrass medium. Effects of microbial inoculants on seed germination and initial growth of Festuca arundinacea L. were analyzed to investigate the optimal proportion of compound microbial inoculants. Significant differences were found in various growth indices and chlorophyll content of F. arundinacea between microbial treatment and control The combination of Pseudomonas stutzeri and Trichoderma reesei exhibited the best results. Compared with the control, seed germination rate, seedling height, shoot dry weight, root weight, chlorophyll a content and chlorophyll b content of F. arundinacea treated with the combination of Pseudomonas stutzeri and Trichoderma reesei were improved by 11.60%, 43.47%, 148%, 159%, 144% and 136%, respectively. Based on comprehensive analysis of various indicators, the optimal proportion （V/V） of microbial combination was Pseudomonas stutzeri： Tfichoderma reesei = 1： 1, which was the most conducive to plant growth and development.

关键词： sewage sludge Microbial inoculants Festuca arundinacea L. Initial growth

Phosphorus Recovery from the Ash of sewage sludge Using NaOH by Heat Treatment-II—Reuse of the Alkali Water Generated by Phosphorus Recovery

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材料科学与工程（中英文B版） 2020年第4期10卷 158-162页

作者： Masaaki Takahashi Yukimasa Takemoto Seiji Iwasaki Eiji Yuuki Research Laboratory on Environmental Technology Yokkaichi UniversityKayo-cho 1200YokkaichiMie 512-8512Japan Mie Chuo Kaihatsu Co. LtdHachiya 4713YonoIgaMie 518-1152Japan

The phosphorus recovery from the incinerated ash using NaOH by the heat treatment,was *** this method,non-reacted NaOH containing alkali water was generated with the phosphorus *** order to find out the best method for reuse of the alkali water,the alkali water was mixed with new reagent of NaOH,and the phosphorus recovery was carried *** phosphorus was recovered as a sodium phosphate,and the recovery rate was almost the same even with the reuse of the alkali water.

关键词： Incinerated ash sewage sludge sodium hydroxide waste alkali phosphorus recovery

PAHs Emission during sewage sludge Combustion in a Drop Tube Furnace

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PAHs Emission during Sewage Sludge Combustion in a Drop Tube...

Effect of wastewater treatment processes on the pyrolysis properties of the pyrolysis tars from sewage sludges

2012年环境污染与大众健康学术会议

作者： Yuqi Li 1 , Jun Han 1 , Linbo Qin 1 , Zhiqiang Tu 1 , Wenjun Zhang 1 , Wei Ye 1 , Wangsheng Chen 2 1. Hubei Key Laboratory of Coal Conversion and New Materials Wuhan University of Science and Technology, Wuhan, P.R.China 2. College of Resources and Environment Engineering Wuhan university of Science and Technology Wuhan, P.R.China

The emission characteristic of Polycyclic Aromatic Hydrocarbons （PAHs） during sewage sludge combustion was investigated in a laboratory-scale drop tube furnace at a temperatures range of 950-1250 0 C. The experimental results demonstrated that FluA, BbF, BaP and DbA are dominated in flue gas. Meanwhile, the four-ring, five-ring PAHs and the total PAHs emission in flue gas during sewage sludge combustion were firstly increased and then decreased at temperature ranging from 950 to 1250 0 C. In addition, it was also found that the five-ring PAHs were the main contribution for the toxic equivalent （TEQ） concentration. The five-ring PAHs TEQ concentration accounted for more than 92.0% of total PAHs TEQ concentrations.

关键词： sewage sludge combustion drop tube furnace PAHs

来源： cnki会议评论

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Journal of Thermal Science 2011年第2期20卷 167-172页

作者： Wu Xia Xie Li-ping Li Xin-yu Dai Xiao-hong Fei Xue-ning Yuan-guangt School of Environment ＆ Chemical Engineering Tianjin Polytechnic University Tianjin 300160 China Department of Environmental and Municipal Engineering Tianjin Institute of Urban Construction Tianjin 300384 China

The pyrolysis properties of five different pyrolysis tars, which the tars from 1# to 5# are obtained by pyrolyzing the sewage sludges of anaerobic digestion and indigestion from the A2/O wastewater treatment process, those from the activated sludge process and the indigested sludge from the continuous SBR process respectively, were studied by thermal gravimetric analysis at a heating rate of 10 ℃/min in the nitrogen atmosphere. The results show that the pyrolysis processes of the pyrolysis tars of 1#, 2#, 3# and 5# all can be divided into four stages: the stages of light organic compounds releasing, heavy polar organic compounds decomposition, heavy organic compounds decomposition and the residual organic compounds decomposition. However, the process of 4# pyrolysis tar is only divided into three stages: the stages of light organic compounds releasing, decomposition of heavy polar organic compounds and the residual heavy organic compounds respectively. Both the sludge anaerobic digestion and the "anaerobic" process in wastewater treatment processes make the content of light organic compounds in tars decrease, but make that of heavy organic compounds with complex structure increase. Besides, both make the pyrolysis properties of the tars become worse. The pyrolysis reaction mechanisms of the five pyrolysis tars have been studied with Coats-Redfern equation. It shows that there are the same mechanism functions in the first stage for the five tars and in the second and third stage for the tars of 1#, 2#, 3# and 5#, which is different with the function in the second stage for 4# tar. The five tars are easy to volatile.

关键词： sewage sludge pyrolysis tar pyrolysis wastewater treatment process anaerobic digestion

Extractable Fractions of Metals in sewage sludges from Five Typical Urban Wastewater Treatment Plants of China

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Pedosphere 2006年第6期16卷 756-761页

作者： WANG Chao LI Xiao-Chen WANG Pei-Fang ZOU Li-Min MA Hai-Tao Key Laboratory of Integrated Regulation and Resource Department on Shallow Lakes Ministry of Education Nanjing 210098 China School of Environmental Science and Engineering Hohai University Nanjing 210098 China

Metal content and bioavailability are often the limiting factors for application of sewage sludge in agricultural fields. sewage sludge samples were collected from five typical urban wastewater treatment plants in China to investigate their contents and distribution of various chemical fractions of Cu, Zn, Ni, Cr, Pb and Mo by using the BCR （Community Bureau of Reference） sequential extraction procedure. The sludges contained considerable amounts of organic matter （31.8%- 48.0%）, total N （16.3-26.4 g kg^-1） and total P （15.1-23.9 g kg^-1）, indicating high potential agricultural benefits of their practical applications. However, total Zn and Ni contents in the sludge exceeded the values permitted in China＇s control standards for pollutants in sludges from agricultural use （GB 4284-1984）. The residual fraction was the predominant fraction for Mo, Ni and Cr, the oxidizable fraction was the primary fraction for Cu and Pb, and the exchangeable and reducible fractions were principal for Zn. The distribution of different chemical fractions among the sludge samples refiected differences in their physicochemical properties, especially pH. The sludge pH was negatively correlated with the percentages of reducible fraction of Cu and exchangeable fraction of Zn. The sludges from these plants might not be suitable for agricultural applications due to their high contents of Zn, Ni and Cr, as well as high potential of mobility and bioavailability of Zn.

关键词： fractions heavy metals sequential extraction sewage sludge

Current status and developing trends of the contents of heavy metals in sewage sludges in China

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Frontiers of Environmental Science & Engineering 2014年第5期8卷 719-728页

作者： Jun YANG Mei LEI Tongbin CHEN Ding GAO Guodi ZHENG Guanghui GUO Duujong LEE Center for Environmental Remediation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Department of Chemical Engineering Taiwan University Taipei 106 China

It is essential to determine the heavy metal concentrations in sewage sludge to select appropriate disposal methods. We conducted a national survey of heavy metal concentrations of sewage sludge samples from 107 municipal sewage treatment plants located in 48 cities covering the 31 provinces and autonomous regions, as well as Hong Kong, Macao and Taiwan by Xinjiang Production and Construction Corps in 2006, and identified the temporal trends of heavy metal contents in sewage sludge by comparison with surveys conducted in 1994-2001. In 2006, the average concentrations of As, Cd, Cr, Cu, Hg, Ni, Pb, and Zn in sewage sludge were 20.2, 1.97, 93.1, 218.8, 2.13, 48.7, 72.3, and ***-1, respectively. Because of the decreased discharge of heavy metals into industrial wastewater in China and the increasingly stringent regulations governing the content of industrial wastes entering sewers, the average concentrations of Cd, Cr, Cu, Hg, Ni, Pb, and Zn have decreased by 32.3%, 49.7%, 54.9%, 25.0%, 37.2%, 44.8%, and 27.0%, respectively, during the past 12 years. The concentrations of Cd, Cr, Cu, Ni, and Zn in the samples exceeded the heavy metal limits of the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant in China （GB 18918-2002） by 6.5%, 3.7%, 6.5%, 6.5%, and 11.2%, respectively. From these results, 85 of the 107 municipal sludges analyzed would be considered suitable for land application.

关键词： sewage sludge heavy metals temporal variation national survey environmental policies

Changes in Soil Solution Cu and Zn Following Application of Alkaline Stab ilisedsewagesludgeand GammaIrradiation *1

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Pedosphere 1998年第2期8卷 134-142页

作者： YAN WEIDONG 1, LUO YONGMING 2 and P. CHRISTIE 2 1 Institute of Soil Science, the Chinese Academy of Sciences, P.O Box 821, Nanjing 210008 (China) 2 Agricultural and Environmental Science Department, the Queen’s University of Belfast, Ne

A glasshouse pot experiment was conducted to study changes in the solubility of copper and zinc in the soil plant system following heavy application of sewage sludge and partial sterilisation of the sludge/soil mixture. A slightly acid sandy loam was mixed with alkaline stabilised and composted urban sewage sludge solids (`Agri Soil', 180 t hm -2 ), and the soil/sludge mixture was γ irradiated (10 kGy). The contrasts without the application of sewage sludge and γ irradiation were also included in the experiment. Perennial ryegrass (Lolium perenne cv. Magella) was grown on irradiated and unirradiated soils for 50 days. Soil solution samples were obtained using soil suction samplers immediately before plant transplantation and every ten days thereafter. The soil solution samples were used directly for determination of Cu and Zn, together with pH, electrical conductivity (EC) and absorbance at wavelength 360 nm (A 360 ). Application of Agri Soil led to a substantial increase in dissolved Cu and a significant decrease in dissolved Zn in the soil solution and these effects were accompanied by increased soil solution pH, EC and A 360 . The alkaline sludge product (Agri Soil) in combination with γ irradiation also led to a pronounced elevation of Cu and A 360 but a marked decline in EC, indicating an increase in dissolved organic compounds and a decrease in the ionic strength of the soil solution. The dissolved Cu and Zn, EC and A 360 usually decreased while the pH increased after plant growth for 50 days.

关键词： copper γ irradiation sewage sludge soil solution zinc

A “Seawater-in-sludge” approach for capacitive biochar production via the alkaline and alkaline earth metals activation

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Frontiers of Environmental Science & Engineering 2021年第1期15卷 63-76页

作者： Xiling Li Tianwei Hao Yuxin Tang Guanghao Chen Department of Civil&Environmental Engineering The Hong Kong University of Science and TechnologyHong Kong 999077China Department of Civil and Environmental Engineering Faculty of Science and TechnologyUniversity of MacaoMacao 999078China Institute of Applied Physics and Materials Engineering University of MacaoMacao 999078China Water Technology Center The Hong Kong University of Science and TechnologyHong Kong 999077China Hong Kong Branch of Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution The Hong Kong University of Science and TechnologyHong Kong 999077China Wastewater Treatment Laboratory FYT Graduate SchoolThe Hong Kong University of Science and TechnologyGuangzhou 511458China

sewage sludge is a potential precursor for biochar production,but its effective utilization involves costly activation *** modify biochar properties while ensuring cost-effectiveness,we examined the feasibility of using seawater as an agent to activate biochar produced from sewage *** our proof-of-concept study,seawater was proven to be an effective activation agent for biochar production,achieving a surface area of 480.3 m^(2)/g with hierarchical porosity *** from our design,the catalytic effect of seawater increased not only the surface area but also the graphitization degree of biochar when comparing the pyrolysis of sewage sludge without *** leads to seawater activated biochar electrodes with lower resistance,higher capacitance of 113.9 F/g comparing with control groups without *** the global increase in the salinity of groundwater,especially in coastal areas,these findings provide an opportunity for recovering a valuable carbon resource from sludge.

关键词： sewage sludge Biochar Seawater Recourse recovery Capacitor