Abstract：In this study, the structure-activity mechanism between the degree of aromatization, degree of defect, surface functional groups and the electrical conductivity of sludge-based biochar was explored through the regulation of preparation process parameters. The results showed that higher the degree of aromatization of sludge-based biochar, the better the π-π conjugated structure was for electron transfer and thus the stronger the conductivity. Meanwhile, contrary to the law of pure biochar, the degree of defects of biochar increased with the increase of pyrolysis temperature. Combined with XRD analysis of the composition of sludge based biochar, this law may be related to the distribution of refractory substances in sludge on the surface of biochar. When the pyrolysis temperature was 900℃ and the pyrolysis time was 30min, the resistivity of biochar prepared was only 6.834 Ω· cm, which is very close to that of pure biochar. Electrochemical tests showed that biochar prepared at low temperature (≤600℃) may mainly complete electron transfer through redox groups or metals on the surface, while biochar prepared at high temperature (>600℃) may depend on its graphitization structure to complete electron conduction.
戴晓虎,张 辰,章林伟,等.碳中和背景下污泥处理处置与资源化发展方向思考[J]. 给水排水, 2021,57(3):1-5. Dai X H, Zhang C, Zhang L W, et al.Thoughts on the development direction of sludge treatment and resource recovery under the background of carbon neutrality[J]. Water & Wastewater Engineering, 2021,47(3):1-5.
[2]
章华荣,芦 佳,叶兴联,等.污泥热干化技术应用综述[J]. 中国环保产业, 2020,(1):56-59. Zhang H R, Lu J, Ye X L, et al. Application and characteristic analysis on sludge thermal dewatering technology[J]. China Environmental Protection Industry, 2020,(1):56-59.
[3]
郭松林,陈同斌,高 定,等.城市污泥生物干化的研究进展与展望[J]. 中国给水排水, 2010,26(15):102-105. Guo S L, Chen T B, Gao D, et al. Research progress and prospect of sewage sludge biodrying[J]. China Water & Wastewater, 2010,26(15):102-105.
[4]
张 晨,李杨杨,董黎明,等.预加热对柠檬酸脱水污泥冬季生物干化的影响[J]. 中国环境科学, 2019,39(7):2928-2937. Zhang C, Li Y Y, Dong L M, et al. Effect of pre-heating on bio-drying of citric acid dewatered sludge in winter[J]. China Environmental Science, 2019,39(7):2928-2937
[5]
蒋建国,杨 勇,贾 莹,等.调理剂和通风方式对污泥生物干化效果的影响[J]. 环境工程学报, 2010,4(5):1167-1170. Jiang J G, Yang Y, Jia Y, et al. Effect of amendments and air-flow on biodrying of dehydrated sewage sludge[J]. Chinese Journal of Environmental Engineering, 2010,4(5):1167-1170.
[6]
温如海.小麦生物炭对污泥好氧堆肥腐殖化及电子转移的影响研究[D]. 桂林:桂林理工大学, 2020. Wen R H. Study on the effect of wheat biochar on the humification and electron transfer of sludge aerobic composting[D]. Guilin:Guilin university of technology, 2020.
[7]
袁浩然,鲁 涛,黄宏宇,等.市政污泥热解制备生物炭实验研究[J]. 化工学报, 2012,63(10):3310-3315. Yuan H R, Lu T, Huang H Y, et al. Experimental study for preparing biochar by pyrolysis of municipal sludge[J]. CIESC Journal, 2012, 63(10):3310-3315.
[8]
Ge J, Huang G, Huang J, et al. Particle-scale modeling of methane emission during pig manure/wheat straw aerobic composting[J]. Environmental Science & Technology, 2016,50(8):4374-4383.
[9]
Fu T, Shangguan H, Wu J, et al. Insight into the synergistic effects of conductive biochar for accelerating maturation during electric field-assisted aerobic composting[J]. Bioresource Technology, 2021:125359.
[10]
李 坚,汤 佳,庄 莉,等.导电性生物炭促进Geobacter和Methanosarcina共培养体系互营产甲烷过程[J]. 生态环境学报, 2018,27(7):1260-1268. Li J, Tang J, Zhuang L, et al. Conductive biochar stimulates acetate conversion to methane by syntrophic interaction between Geobacter and Methanosarcina[J]. Ecology and Environmental Sciences, 2018, 27(7):1260-1268.
[11]
Liu L, Liu G, Zhou J, et al. Cotransport of biochar and Shewanella oneidensis MR-1in saturated porous media:Impacts of electrostatic interaction, extracellular electron transfer and microbial taxis[J]. Science of the Total Environment, 2019,(658):95-104.
[12]
唐琳钦,宿程远,赵力剑,等.不同基质生物炭对厌氧处理餐厨垃圾效能及微生态的影响[J]. 中国环境科学, 2020,40(11):4831-4840. Tang L Q, Su C Y, Zhao L J, et al. Effects of different substrate biochar on the performance and microecology of anaerobic biological treating food waste[J]. China Environmental Science, 2020,40(11):4831-4840.
[13]
巫 丹,范方宇,王昌命,等.温度对澳洲坚果壳生物炭特性影响[J]. 应用化工, 2021,50(5):1282-1286,1291. Wu D, Fan F Y, Wang C M, et al. Effects of temperature on the characteristics of Macadamia nut shell biochar[J]. Applied Chemical Industry, 2021,50(5):1282-1286,1291.
[14]
Gabhi R S, Kirk D W, Jia C Q. Preliminary investigation of electrical conductivity of monolithic biochar[J]. Carbon, 2017,116:435-442.
[15]
胡晓虹,马建锋,杨 喜,等.热解温度对黄藤炭导电性能影响研究[J]. 林产工业, 2018,(5):24-30. Hu X H, Ma J F, Yang X, et al. Effects of pyrolysis temperature on the conductivity property of rattan char[J]. China Forest Products Industry, 2018,(5):24-30.
[16]
张文标,叶良明.竹炭导电机理的研究[J]. 南京林业大学学报(自然科学版), 2002,26(4):47-50. Zhang W B, Ye L M. A study on mechanism of electric conduction of bamboo charcoal[J]. Journal of Nanjing Forestry University(Natural Sciences Edition), 2002,26(4):47-50.
[17]
赵迎新,麻泽浩,杨知凡,等.污泥生物炭催化高级氧化过程进展[J]. 化工进展, 2021,40(7):3984-3994. Zhao Y X, Ma Z H, Yang Z F, et al. Progress of advanced oxidation process catalyzed by sludge biochar[J]. Chemical Industry and Engineering Progress, 2021,40(7):3984-3994.
[18]
Liu G, Mba Wright M, Zhao Q, et al. Hydrocarbon and ammonia production from catalytic pyrolysis of sewage sludge with acid pretreatment[J]. ACS Sustainable Chemistry Engineering, 2016,4(3):1819-1826.
[19]
Smith K, Fowler G, Pullket S, et al. Sewage sludge-based adsorbents:a review of their production, properties and use in water treatment applications[J]. Water Research, 2009,43(10):2569-2594.
[20]
刘总堂,邵 江,李 艳,等.碱改性小麦秸秆生物炭对水中四环素的吸附性能[J]. 中国环境科学, 2022,42(8):3736-3743. Liu Z T, Shao J, Li Y, et al. Adsorption performance of tetracycline in water by alkali-modified wheat straw biochars[J]. China Environmental Science, 2022,42(8):3736-3743.
[21]
马志强,胥思勤,姬江浩,等.改性水稻生物炭对水体中Sb(Ⅲ)的吸附[J]. 中国环境科学, 2021,41(6):2706-2716. Ma Z Q, Xu S Q, Ji J H, et al. Adsorption of SB(Ⅲ) in water by modified rice straw biochar[J]. China Environmental Science, 2021, 41(6):2706-2716.
[22]
Hadi P, Xu M, Ning C, et al. A critical review on preparation, characterization and utilization of sludge-derived activated carbons for wastewater treatment[J]. Chemistry Engineering Journal, 2015,(260):895-906.
[23]
Li J, Pan L, Yu G, et al. The synthesis of heterogeneous Fenton-like catalyst using sewage sludge biochar and its application for ciprofloxacin degradation[J]. Science of the Total Environment, 2019, (654):1284-1292.
[24]
Sanchis R, Dejoz A, Vázquez I, et al. Ferric sludge derived from the process of water purification as an efficient catalyst and/or support for the removal of volatile organic compounds[J]. Chemosphere, 2019, (219):286-295.
[25]
Kluepfel L, Keiluweit M, Kleber M, et al. Redox Properties of Plant Biomass-Derived Black Carbon (Biochar)[J]. Environmental Science Technology, 2014,2014,48(10):5601-5611.
[26]
刘 婷.基于电活性生物膜的生物电化学系统及环境效应研究[D]. 长沙:湖南农业大学, 2015. Liu T. Electricity generation and application of electroactive biofilms in the bioelectrochemical systems[D]. Changsha:Hunan agricultural university, 2015.
[27]
黄 婷,张 山,苏明雪,等.污泥基生物炭结构的共焦显微拉曼技术应用[J]. 中国环境科学, 2022,42(7):3378-3384. Huang T, Zhang S, Su M X, et al. Application of confocal Raman microscopy on the structure of sludge-based biochar. China Environmental Science, 2022,42(7):3378-3384.
