Volume 14 Issue 1
Jan.  2024
Turn off MathJax
Article Contents
DAI C,HE Z Q,LI Y,et al.Research progress on the characteristics of biochar material and its application in greywater treatment[J].Journal of Environmental Engineering Technology,2024,14(1):268-277 doi: 10.12153/j.issn.1674-991X.20230301
Citation: DAI C,HE Z Q,LI Y,et al.Research progress on the characteristics of biochar material and its application in greywater treatment[J].Journal of Environmental Engineering Technology,2024,14(1):268-277 doi: 10.12153/j.issn.1674-991X.20230301

Research progress on the characteristics of biochar material and its application in greywater treatment

doi: 10.12153/j.issn.1674-991X.20230301
  • Received Date: 2023-04-17
  • Biochar has the advantages of large specific surface area, high porosity and abundant surface functional groups, and has large potential for application in greywater treatment. The water quality and quantity characteristics of greywater and common treatment technologies were introduced, the properties of biochar, modification methods and the progress of domestic and international applications of biochar substrates in greywater treatment were mainly reviewed, and the regeneration performance of biochar was analyzed. The results showed that most of the biochar currently applied in greywater treatment was wood-derived biochar which has an alkaline range of pH and the advantages of large specific surface area and high porosity, and its specific surface area and porosity were mostly in the range of 0-520 m2/g and 48%-83%. Among numerous modification methods, there were many studies on the modification of metal salt biochar. This method could improve the adsorption capacity of biochar and make it magnetized, making it convenient for later separation and recovery. The biochar matrix was mostly used in constructed wetlands, green walls and other ecological treatment systems for greywater treatment, and the removal rate of organic matter and nutrients in greywater could reach 90% under optimal operating conditions, which had good application prospects. Finally, the problems in the application of biochar in greywater treatment were summarized, and an outlook on three aspects of the research was provided, including strengthening the removal of new pollutants, the regeneration of biochar and the energy saving and consumption reduction.

     

  • loading
  • [1]
    ORON G, ADEL M, AGMON V, et al. Greywater use in Israel and worldwide: standards and prospects[J]. Water Research,2014,58:92-101. doi: 10.1016/j.watres.2014.03.032
    [2]
    PIDOU M, MEMON F A, STEPHENSON T, et al. Greywater recycling: treatment options and applications[J]. Proceedings of the Institution of Civil Engineers - Engineering Sustainability,2007,160(3):119-131. doi: 10.1680/ensu.2007.160.3.119
    [3]
    DIENER S, MOREL A. Greywater management in low and middle-income countries, review of different treatment systems for households or neighbourhoods[J]. Turkish Journal of Fisheries & Aquatic Sciences,2006,45(4/5):428-432.
    [4]
    SHAIKH I N, AHAMMED M M. Quantity and quality characteristics of greywater: a review[J]. Journal of Environmental Management,2020,261:110266. doi: 10.1016/j.jenvman.2020.110266
    [5]
    BIRUKTAWIT G. Greywater treatment using banana peel biochar and sand filtration[D]. Addis Ababa: Addis Ababa University, 2019.
    [6]
    LI Y H, ZHU S K, ZHANG Y, et al. Constructed wetland treatment of source separated washing wastewater in rural areas of Southern China[J]. Separation and Purification Technology,2021,272:118725. doi: 10.1016/j.seppur.2021.118725
    [7]
    CHRISPIM M C, NOLASCO M A. Greywater treatment using a moving bed biofilm reactor at a university campus in Brazil[J]. Journal of Cleaner Production,2017,142:290-296. doi: 10.1016/j.jclepro.2016.07.162
    [8]
    李婉妮. 过滤吸附和生物活性炭技术处理洗浴废水的研究[D]. 北京: 北京交通大学, 2017.
    [9]
    李洋涛, 陈佼, 陆一新, 等. 基于双池人工快渗系统的洗浴废水处理效果研究[J]. 成都工业学院学报,2021,24(1):60-63. doi: 10.13542/j.cnki.51-1747/tn.2021.01.014

    LI Y T, CHEN J, LU Y X, et al. Study on the treatment effect of bathing wastewater based on double pool constructed rapid infiltration systems[J]. Journal of Chengdu Technological University,2021,24(1):60-63. doi: 10.13542/j.cnki.51-1747/tn.2021.01.014
    [10]
    KIM S, PARK C. Fouling behavior and cleaning strategies of ceramic ultrafiltration membranes for the treatment and reuse of laundry wastewater[J]. Journal of Water Process Engineering,2022,48:102840. doi: 10.1016/j.jwpe.2022.102840
    [11]
    田川, 刘江, 陈诗扬, 等. 宿迁市西南片区阳台洗衣废水处理模式研究[J]. 中国给水排水,2022,38(12):68-75.

    TIAN C, LIU J, CHEN S Y, et al. Research on treatment mode of balcony laundry wastewater in southwest downtown of Suqian[J]. China Water & Wastewater,2022,38(12):68-75.
    [12]
    NICOLA D F, CHIARA D M, ANDRES G M, et al. Green walls to treat kitchen greywater in urban areas: performance from a pilot-scale experiment[J]. Science of the Total Environment,2021,757:144189. doi: 10.1016/j.scitotenv.2020.144189
    [13]
    SHEKHAR B R, ZAKARIA BASEM S, RANJAN D B, et al. Effect of salinity and surfactant on volatile fatty acids production from kitchen wastewater fermentation[J]. Bioresource Technology Reports,2022,18:101017. doi: 10.1016/j.biteb.2022.101017
    [14]
    FOUNTOULAKIS M S, MARKAKIS N, PETOUSI I, et al. Single house on-site grey water treatment using a submerged membrane bioreactor for toilet flushing[J]. Science of the Total Environment,2016,551/552:706-711. doi: 10.1016/j.scitotenv.2016.02.057
    [15]
    PATEL P, MUTEEN A, MONDAL P. Treatment of greywater using waste biomass derived activated carbons and integrated sand column[J]. Science of the Total Environment,2020,711:134586. doi: 10.1016/j.scitotenv.2019.134586
    [16]
    陈欢欢. 农村灰水污染特性及吸附-生物处理系统对其净化效能研究[D]. 重庆: 重庆大学, 2021.
    [17]
    WINWARD G P, AVERY L M, STEPHENSON T, et al. Chlorine disinfection of grey water for reuse: effect of organics and particles[J]. Water Research,2008,42(1/2):483-491.
    [18]
    EKEREN K M, HODGSON B A, SHARVELLE S E, et al. Investigation of pathogen disinfection and regrowth in a simple graywater recycling system for toilet flushing[J]. Desalination and Water Treatment,2016,57(54):26174-26186. doi: 10.1080/19443994.2016.1159992
    [19]
    DING A, LIANG H, LI G B, et al. A low energy gravity-driven membrane bioreactor system for grey water treatment: permeability and removal performance of organics[J]. Journal of Membrane Science,2017,542:408-417. doi: 10.1016/j.memsci.2017.08.037
    [20]
    MAHMOUDI A, MOUSAVI S A, DARVISHI P. Greywater as a sustainable source for development of green roofs: characteristics, treatment technologies, reuse, case studies and future developments[J]. Journal of Environmental Management,2021,295:112991. doi: 10.1016/j.jenvman.2021.112991
    [21]
    NAUTIYAL R, ULIANA S, RAJ I, et al. Decentralized treatment of grey water by natural coagulants in the presence of coagulation aid[C]//Proceedings of the 2nd World Congress on Civil, Structural, and Environmental Engineering", "World Congress on Civil, Structural, and Environmental Engineering. April 2-4, 2017. Avestia Publishing, 2017.
    [22]
    PRIYANKA K, REMYA N, BEHERA M. Greywater treatment using modified solar photocatalyst- degradation, kinetics, pathway and toxicity analysis[J]. Separation and Purification Technology,2020,251:117319. doi: 10.1016/j.seppur.2020.117319
    [23]
    KHALIL M, LIU Y. Greywater biodegradability and biological treatment technologies: a critical review[J]. International Biodeterioration & Biodegradation,2021,161:105211.
    [24]
    何志琴, 陈盛, 李云. MBR技术在农村生活污水处理中的研究进展[J]. 环境工程技术学报,2022,12(1):137-144. doi: 10.12153/j.issn.1674-991X.20210177

    HE Z Q, CHEN S, LI Y. Research progress of MBR in rural domestic wastewater treatment[J]. Journal of Environmental Engineering Technology,2022,12(1):137-144. doi: 10.12153/j.issn.1674-991X.20210177
    [25]
    ZHOU Y, JI B H, JIANG M, et al. Performance and microbial community features of tidal-flow biochar-amended constructed wetlands treating sodium dodecyl sulfate (SDS)-containing greywater[J]. Journal of Cleaner Production,2023,396:136545. doi: 10.1016/j.jclepro.2023.136545
    [26]
    BARRON N J, HATT B, JUNG J, et al. Seasonal operation of dual-mode biofilters: the influence of plant species on stormwater and greywater treatment[J]. Science of the Total Environment,2020,715:136680. doi: 10.1016/j.scitotenv.2020.136680
    [27]
    BOANO F, COSTAMAGNA E, CARUSO A, et al. Evaluation of the influence of filter medium composition on treatment performances in an open-air green wall fed with greywater[J]. Journal of Environmental Management,2021,300:113646. doi: 10.1016/j.jenvman.2021.113646
    [28]
    李云, 何志琴, 夏训峰, 等. 国内外灰水处理技术研究进展[J]. 环境工程技术学报,2021,11(5):935-941. doi: 10.12153/j.issn.1674-991X.20200301

    LI Y, HE Z Q, XIA X F, et al. Research progress of greywater treatment technology at home and abroad[J]. Journal of Environmental Engineering Technology,2021,11(5):935-941. doi: 10.12153/j.issn.1674-991X.20200301
    [29]
    WANG H X, XU J L, SHENG L X, et al. A review of research on substrate materials for constructed wetlands[J]. Materials Science Forum,2018,913:917-929. doi: 10.4028/www.scientific.net/MSF.913.917
    [30]
    YAASHIKAA P R, KUMAR P S, VARJANI S, et al. A critical review on the biochar production techniques, characterization, stability and applications for circular bioeconomy[J]. Biotechnology Reports,2020,28:e00570. doi: 10.1016/j.btre.2020.e00570
    [31]
    郭彦秀, 李旭光, 侯太磊, 等. 生物炭基材料活化过一硫酸盐降解有机污染物的研究进展[J]. 环境科学研究,2021,34(4):936-944. doi: 10.13198/j.issn.1001-6929.2021.01.12

    GUO Y X, LI X G, HOU T L, et al. Review of biochar-based materials for catalyzing peroxymonosulfate degradation of organic pollutants[J]. Research of Environmental Sciences,2021,34(4):936-944. doi: 10.13198/j.issn.1001-6929.2021.01.12
    [32]
    ENAIME G, BAÇAOUI A, YAACOUBI A, et al. Biochar for wastewater treatment: conversion technologies and applications[J]. Applied Sciences,2020,10(10):3492. doi: 10.3390/app10103492
    [33]
    彭成法, 肖汀璇, 李志建. 热解温度对污泥基生物炭结构特性及对重金属吸附性能的影响[J]. 环境科学研究,2017,30(10):1637-1644. doi: 10.13198/j.issn.1001-6929.2017.02.95

    PENG C F, XIAO T X, LI Z J. Effects of pyrolysis temperature on structural properties of sludge-based biochar and its adsorption for heavy metals[J]. Research of Environmental Sciences,2017,30(10):1637-1644. doi: 10.13198/j.issn.1001-6929.2017.02.95
    [34]
    洪亚军, 徐祖信, 冯承莲, 等. 水葫芦/污泥共热解法制备生物炭粒及其对Cr3+的吸附特性[J]. 环境科学研究,2020,33(4):1052-1061.

    HONG Y J, XU Z X, FENG C L, et al. Co-pyrolysis of water hyacinth and sewage sludge for preparation of biochar particles and its adsorption properties for Cr3+[J]. Research of Environmental Sciences,2020,33(4):1052-1061.
    [35]
    郑永昕, 魏东宁, 余学, 等. 氧化石墨烯改性污泥基生物炭对培氟沙星的去除机理研究[J]. 环境科学研究,2020,33(12):2879-2887. doi: 10.13198/j.issn.1001-6929.2020.06.19

    ZHENG Y X, WEI D N, YU X, et al. Removal mechanism of pefloxacin by graphene oxide modified sludge biochar[J]. Research of Environmental Sciences,2020,33(12):2879-2887. doi: 10.13198/j.issn.1001-6929.2020.06.19
    [36]
    GAYATHRI R, GOPINATH K P, KUMAR P S. Adsorptive separation of toxic metals from aquatic environment using agro waste biochar: application in electroplating industrial wastewater[J]. Chemosphere,2021,262:128031. doi: 10.1016/j.chemosphere.2020.128031
    [37]
    SILBER A, LEVKOVITCH I, GRABER E R. pH-dependent mineral release and surface properties of cornstraw biochar: agronomic implications[J]. Environmental Science & Technology,2010,44(24):9318-9323.
    [38]
    BAUTISTA QUISPE J I, CAMPOS L C, MAŠEK O, et al. Use of biochar-based column filtration systems for greywater treatment: a systematic literature review[J]. Journal of Water Process Engineering,2022,48:102908. doi: 10.1016/j.jwpe.2022.102908
    [39]
    袁帅, 赵立欣, 孟海波, 等. 生物炭主要类型、理化性质及其研究展望[J]. 植物营养与肥料学报,2016,22(5):1402-1417. doi: 10.11674/zwyf.14539

    YUAN S, ZHAO L X, MENG H B, et al. The main types of biochar and their properties and expectative researches[J]. Journal of Plant Nutrition and Fertilizer,2016,22(5):1402-1417. doi: 10.11674/zwyf.14539
    [40]
    DALAHMEH S S. Capacity of biochar filters for wastewater treatment in onsite systems[D]. Uppsala: Swedish University of Agricultural Sciences, 2016.
    [41]
    SULIMAN W, HARSH J B, ABU-LAIL N I, et al. Influence of feedstock source and pyrolysis temperature on biochar bulk and surface properties[J]. Biomass and Bioenergy,2016,84:37-48. doi: 10.1016/j.biombioe.2015.11.010
    [42]
    BERGER C M. Biochar and activated carbon filters for greywater treatment: comparison of organic matter and nutrients removal [D]. Uppsala: Swedish University of Agricultural Sciences, 2012.
    [43]
    SIDIBÉ M. Comparative study of bark, bio-char, activated charcoal filters for upgrading grey-water from a hygiene aspect[D]. Uppsala: Swedish University of Agricultural Sciences, 2014.
    [44]
    PEREZ-MERCADO L F, LALANDER C, JOEL A, et al. Biochar filters as an on-farm treatment to reduce pathogens when irrigating with wastewater-polluted sources[J]. Journal of Environmental Management,2019,248:109295. doi: 10.1016/j.jenvman.2019.109295
    [45]
    BASNET M. Application of ferric enriched biochar to capture N and P from greywater[D]. Helsinki: Helsinki Metropolia University of Applied Sciences, 2015.
    [46]
    操家顺, 赵宇杰, 薛朝霞, 等. 吸附-催化材料的制备及对生活洗衣废水的处理[J]. 水处理技术,2019,45(5):116-120. doi: 10.16796/j.cnki.1000-3770.2019.05.026

    CAO J S, ZHAO Y J, XUE Z X, et al. Preparation of adsorption-catalytic material and its performance on laundry wastewater treatment[J]. Technology of Water Treatment,2019,45(5):116-120. doi: 10.16796/j.cnki.1000-3770.2019.05.026
    [47]
    SAMUEL S W. Comparative studies of the performance of filter media made using biochar and activated carbon in greywater remediation[D]. Zaria: Ahmadu Bello University, 2017.
    [48]
    DALAHMEH S S, LALANDER C, PELL M, et al. Quality of greywater treated in biochar filter and risk assessment of gastroenteritis due to household exposure during maintenance and irrigation[J]. Journal of Applied Microbiology,2016,121(5):1427-1443. doi: 10.1111/jam.13273
    [49]
    MOLAEI R. Pathogen and indicator organisms removal in artificial greywater subjected to aerobic treatment[D]. Uppsala: Swedish University of Agricultural Sciences, 2014.
    [50]
    孙建财, 周丹丹, 王薇, 等. 生物炭改性及其对污染物吸附与降解行为的研究进展[J]. 环境化学,2021,40(5):1503-1513. doi: 10.7524/j.issn.0254-6108.2020102106

    SUN J C, ZHOU D D, WANG W, et al. Research progress on modification of biochar and its adsorption and degradation behavior[J]. Environmental Chemistry,2021,40(5):1503-1513. doi: 10.7524/j.issn.0254-6108.2020102106
    [51]
    JIN J, LI S W, PENG X Q, et al. HNO3 modified biochars for uranium (Ⅵ) removal from aqueous solution[J]. Bioresource Technology,2018,256:247-253. doi: 10.1016/j.biortech.2018.02.022
    [52]
    FENG Z J, ZHU L Z. Sorption of phenanthrene to biochar modified by base[J]. Frontiers of Environmental Science & Engineering,2018,12(2):1.
    [53]
    BANERJEE S, MUKHERJEE S, LAMINKA-OT A, et al. Biosorptive uptake of Fe2+, Cu2+ and As5+ by activated biochar derived from Colocasia esculenta: Isotherm, kinetics, thermodynamics, and cost estimation[J]. Journal of Advanced Research,2016,7(5):597-610. doi: 10.1016/j.jare.2016.06.002
    [54]
    SIZMUR T, FRESNO T, AKGÜL G, et al. Biochar modification to enhance sorption of inorganics from water[J]. Bioresource Technology,2017,246:34-47. doi: 10.1016/j.biortech.2017.07.082
    [55]
    BAO Z J, SHI C Z, TU W Y, et al. Recent developments in modification of biochar and its application in soil pollution control and ecoregulation[J]. Environmental Pollution,2022,313:120184. doi: 10.1016/j.envpol.2022.120184
    [56]
    PATEL P, GUPTA S, MONDAL P. Modeling of continuous adsorption of greywater pollutants onto sawdust activated carbon bed integrated with sand column[J]. Journal of Environmental Chemical Engineering,2022,10(2):107155. doi: 10.1016/j.jece.2022.107155
    [57]
    CAROLINA R, FERNANDA C, RAFAEL S, et al. Performance and treatment assessment of a pilot-scale decentralized greywater reuse system in rural schools of north-central Chile[J]. Ecological Engineering,2022,174:106460. doi: 10.1016/j.ecoleng.2021.106460
    [58]
    SUN Y B, WU Z Y, WANG X X, et al. Macroscopic and microscopic investigation of U(Ⅵ) and Eu(Ⅲ) adsorption on carbonaceous nanofibers[J]. Environmental Science & Technology,2016,50(8):4459-4467.
    [59]
    ZHAO L, ZHENG W, MAŠEK O, et al. Roles of phosphoric acid in biochar formation: synchronously improving carbon retention and sorption capacity[J]. Journal Of Environmental Quality, 2017, 46(2): 393-401.
    [60]
    DING Z H, HU X, WAN Y S, et al. Removal of lead, copper, cadmium, zinc, and nickel from aqueous solutions by alkali-modified biochar: batch and column tests[J]. Journal of Industrial and Engineering Chemistry,2016,33:239-245. doi: 10.1016/j.jiec.2015.10.007
    [61]
    AbdURREHMAN H M, DELETIC A, ZHANG K, et al. The comparative performance of lightweight green wall media for the removal of xenobiotic organic compounds from domestic greywater[J]. Water Research,2022,221:118774. doi: 10.1016/j.watres.2022.118774
    [62]
    JING X R, WANG Y Y, LIU W J, et al. Enhanced adsorption performance of tetracycline in aqueous solutions by methanol-modified biochar[J]. Chemical Engineering Journal,2014,248:168-174. doi: 10.1016/j.cej.2014.03.006
    [63]
    LIAO Y, JIANG L, CAO X K, et al. Efficient removal mechanism and microbial characteristics of tidal flow constructed wetland based on in situ biochar regeneration (BR-TFCW) for rural gray water[J]. Chemical Engineering Journal,2022,431:134185. doi: 10.1016/j.cej.2021.134185
    [64]
    兰淑澄. 过滤-生物活性炭技术处理洗浴废水[J]. 环境保护,2002,30(8):16-17. doi: 10.3969/j.issn.0253-9705.2002.08.005

    LAN S C. Wash-bath wastewater treatd by filtration-biological activated carbon technology[J]. Environmental Protection,2002,30(8):16-17. doi: 10.3969/j.issn.0253-9705.2002.08.005
    [65]
    ADDO-BANKAS O, ZHAO Y Q, VYMAZAL J, et al. Green walls: a form of constructed wetland in green buildings[J]. Ecological Engineering,2021,169:106321. doi: 10.1016/j.ecoleng.2021.106321
    [66]
    LAKHO F H, VERGOTE J, KHAN H I U H, et al. Total value wall: full scale demonstration of a green wall for grey water treatment and recycling[J]. Journal of Environmental Management,2021,298:113489. doi: 10.1016/j.jenvman.2021.113489
    [67]
    NIWAGABA C B, DINNO P, WAMALA I, et al. Experiences on the implementation of a pilot grey water treatment and reuse based system at a household in the slum of Kyebando-Kisalosalo, Kampala[J]. Journal of Water Reuse and Desalination,2014,4(4):294-307. doi: 10.2166/wrd.2014.016
    [68]
    WUROCHEKKE A A, HARUN N A, MOHAMED R M S R, et al. Constructed wetland of Lepironia articulata for household greywater treatment[J]. APCBEE Procedia,2014,10:103-109. doi: 10.1016/j.apcbee.2014.10.025
    [69]
    SUSILAWATI, SIHOMBING Y A, RAHAYU S U, et al. Filter material based on zeolite-activated charcoal from cocoa shells as ammonium adsorbent in greywater treatment[J]. South African Journal of Chemical Engineering,2023,43:266-272. doi: 10.1016/j.sajce.2022.11.006
    [70]
    DENG S J, CHEN J Q, CHANG J J. Application of biochar as an innovative substrate in constructed wetlands/biofilters for wastewater treatment: performance and ecological benefits[J]. Journal of Cleaner Production,2021,293:126156. doi: 10.1016/j.jclepro.2021.126156
    [71]
    KAETZL K, LÜBKEN M, UZUN G, et al. On-farm wastewater treatment using biochar from local agroresidues reduces pathogens from irrigation water for safer food production in developing countries[J]. Science of the Total Environment,2019,682:601-610. doi: 10.1016/j.scitotenv.2019.05.142
    [72]
    ODEGA C A, AYODELE O O, OGUTUGA S O, et al. Potential application and regeneration of bamboo biochar for wastewater treatment: a review[J]. Advances in Bamboo Science,2023,2:100012. doi: 10.1016/j.bamboo.2022.100012
    [73]
    叶华明, 王孝青, 王红萍. 活性炭的循环再生[J]. 染料与染色,2018,55(3):56-57.

    YE H M, WANG X Q, WANG H P. The recycling method of activated carbon[J]. Dyestuffs and Coloration,2018,55(3):56-57.
    [74]
    SALVADOR F, MARTIN-SANCHEZ N, SANCHEZ-HERNANDEZ R, et al. Regeneration of carbonaceous adsorbents: part Ⅱ. chemical, microbiological and vacuum regeneration[J]. Microporous and Mesoporous Materials,2015,202:277-296. doi: 10.1016/j.micromeso.2014.08.019
    [75]
    ZENG S Q, KAN E. Adsorption and regeneration on iron-activated biochar for removal of microcystin-LR[J]. Chemosphere,2021,273:129649. doi: 10.1016/j.chemosphere.2021.129649
    [76]
    HUANG A X, BAI W L, YANG S L, et al. Adsorption characteristics of chitosan-modified bamboo biochar in Cd(Ⅱ) contaminated water[J]. Journal of Chemistry,2022,2022:1-10.
    [77]
    HU H, SUN L L, JIANG B Q, et al. Low concentration Re(Ⅶ) recovery from acidic solution by Cu-biochar composite prepared from bamboo ( Acidosasa longiligula) shoot shell[J]. Minerals Engineering,2018,124:123-136. doi: 10.1016/j.mineng.2018.05.021
    [78]
    SHEN T Y, WANG P, HU L M, et al. Adsorption of 4-chlorophenol by wheat straw biochar and its regeneration with persulfate under microwave irradiation[J]. Journal of Environmental Chemical Engineering,2021,9(4):105353. ⊗ doi: 10.1016/j.jece.2021.105353
  • 加载中

Catalog

    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

    1. 本站搜索
    2. 百度学术搜索
    3. 万方数据库搜索
    4. CNKI搜索

    Tables(5)

    Article Metrics

    Article Views(138) PDF Downloads(54) Cited by()
    Proportional views
    Related

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return