FCDI中利用ZnCl<sub>2</sub>改性沼渣生物炭去除餐厨垃圾沼液中氮磷研究

孙慧敏; 吴宇彪; 黄胜杰; 张学东

doi:10.13205/j.hjgc.202605021

FCDI中利用ZnCl₂改性沼渣生物炭去除餐厨垃圾沼液中氮磷研究

doi: 10.13205/j.hjgc.202605021

1. 江南大学环境与生态学院, 江苏无锡 214122;
2. 江苏鹏鹞环保集团有限公司, 江苏宜兴 214124

基金项目:

国家重点研发计划项目（2024YFC3810200）；江苏省双创计划项目-江苏省“双创博士”项目（JSSCBS20221049）

详细信息

作者简介:
孙慧敏(1993—),女,博士研究生,主要研究方向为固废资源化利用。sunhuimin5@126.com

通讯作者:
张学东(1980—),男,教授,主要研究方向为固废处理技术。xuedong.zhang@jiangnan.edu.cn

计量
- 文章访问数: 1
- HTML全文浏览量: 0
- PDF下载量: 0
- 被引次数: 0
出版历程
- 收稿日期: 2025-05-06
- 网络出版日期: 2026-06-06

Nitrogen and phosphorus removal from kitchen waste biogas slurry by ZnCl₂-modified biogas residue biochar in FCDI

1. School of Environment and Ecology, Jiangnan University, Wuxi 214122, China;
2. Pen Yao Environmental Protection Company, Yixin 214214, China

摘要

摘要: 餐厨垃圾厌氧消化的消化液经过初步分离形成沼渣和沼液。沼渣中仍有大量营养物质且碳含量高，具备资源化利用的可行性，特别是将沼渣热解转化为生物炭进行二次利用，近年来受到广泛关注。制备了餐厨垃圾沼渣生物炭，并将其作为流动电极电容去离子（flow-electrode capacitive deionization， FCDI）体系中的电极活性材料，并以活性炭为对照组，考察其对餐厨垃圾沼液中氮磷的去除性能。研究结果表明：生物炭经ZnCl₂改性后，比表面积、吸附性能、电容、电阻等理化特性均得到显著提升。改性生物炭在电极液中的最佳质量分数为7.5%，且FCDI体系运行12 h，合成消化液中NH₄⁺-N和磷酸盐（reactive phosphorus， RP）的去除率分别为47.7%和55.2%。电极活性材料分别为活性炭、ZnCl₂改性生物炭和生物炭时，FCDI体系的脱氮除磷效果依次减弱。FCDI体系中连续运行餐厨垃圾厌氧消化液的处理结果表明，NH₄⁺-N和RP的去除率最高分别为32.2%和26.2%。此外，在实际消化液中，多肽、氨基酸等有机污垢易堵塞离子交换膜的通道并增大膜电阻，进而影响离子转移和电荷传输，降低FCDI体系的去离子性能。
- 流动电极电容去离子体系 /
- 共存离子 /
- 餐厨垃圾沼液 /
- 氨氮 /
- 磷酸盐
Abstract: The digestate of anaerobic digestion of food waste can be separated into residues and filtrate. The filtrate still contains a high content of nutrients and carbon， making it a feasible resource for utilization. The pyrolysis of the residues into biochar for secondary use has gained widespread attention. This study prepared biochar from food waste digestate as an electrode active material for the flow-electrode capacitive deionization （FCDI） system， and investigated its nitrogen and phosporus removal performance， with activated carbon as a control group. The results showed that biochar modified with zinc chloride significantly improved its surface area， adsorption properties， capacitance， and resistance. The optimal mass fraction of the modified biochar in the electrode liquid was 7.5%， and the removal efficiencies of NH₄⁺-N and reactive phosphorus （RP） in the simulated digestate were 47.7% and 55.2%， respectively， when the FCDI system ran for 12 h. The results indicated the performances of the FCDI systems with activated carbon， modified biochar in nitrogen and phosphorus removal were evidently better than the system with unmodified biochar. The continuous operation of the FCDI system with digestate filtrate derived from anaerobic digestion of food waste showed the highest removal efficiencies of NH₄⁺-N and RP at 32.2% and 26.2%， respectively， which were poorer than that of the system with simulated digestate filtrate. The undermined performance might be related to the presence of peptides and amino acids in the actual digestate， which were prone to block the ion-exchange membrane channels and increase resistance， subsequently mitigating ion transfer， charge transport， and reducing the deionization performance of the FCDI system.
- flow-electrode capacitive deionization （FCDI） system /
- co-existing anions /
- kitchen waste biogas slurry /
- ammonia /
- phosphorus

HTML全文

参考文献(37)

[1]	LI Y S，LIANG Y，YAN Y Y，et al. Design of biogas slurry treatment for co-anaerobic digestion of kitchen waste/municipal sludge/urban manure［J］. China Water & Wastewater，2021，37（14）：56- 62. 李义烁，梁远，颜莹莹，等. 餐厨垃圾/市政污泥/城市粪便联合厌氧消化沼液处理设计［J］. 中国给水排水，2021，37（14）：56- 62.
[2]	SHI S S，GAO M，WANG Q H，et al. Study on biofuel butanol production by fermentation of kitchen waste［J］. Environmental Engineering，2017，35（2）：117- 121. 石姗姗，高明，汪群慧，等. 餐厨垃圾发酵制备生物燃料丁醇的研究［J］. 环境工程，2017，35（2）：117- 121.
[3]	XI J，MEI Z L，LI S L，et al. Research progress on effects of pretreatment on anaerobic digestion of kitchen waste［J］. Environmental Engineering，2016，34（6）：140- 145. 席江，梅自力，李淑兰，等. 预处理对餐厨垃圾厌氧消化的影响研究进展［J］. 环境工程，2016，34（6）：140- 145.
[4]	PRAMANIK S K，SUIA F B，ZAIN S M，et al. The anaerobic digestion process of biogas production from food waste：prospects and constraints［J］. Bioresource Technology Reports，2019，8：100323.
[5]	KE L，LIU X，DU B，et al. Component analysis and risk assessment of biogas slurry from biogas plants［J］. Chinese Journal of Chemical Engineering，2022，44：182- 191.
[6]	LIU J X，HUANG S M，CHEN K，et al. Preparation of biochar from food waste digestate：pyrolysis behavior and product properties［J］. Bioresource Technology，2020，302：122906.
[7]	YONG T Z，LI Y，LU J G，et al. Research progress on flow-electrode capacitive deionization［J］. Industrial Water Treatment，2023，43（1）：17- 25. 雍天智，李阳，陆建刚，等. 流动电极电容去离子技术研究进展［J］. 工业水处理，2023，43（1）：17- 25.
[8]	ZHANG C，MA J，WU L，et al. Flow electrode capacitive deionization（FCDI）：recent developments，environmental applications，and future perspectives［J］. Environmental Science & Technology，2021，55（8）：4243- 4267.
[9]	ZHANG J，TANG L，TANG W，et al. Removal and recovery of phosphorus from low-strength wastewaters by flow-electrode capacitive deionization［J］. Separation and Purification Technology，2020，237：116318.
[10]	FANG K，GONG H，HE W，et al. Recovering ammonia from municipal wastewater by flow-electrode capacitive deionization［J］. Chemical Engineering Journal，2018，348：301- 309.
[11]	HAN S，JEON S I，LEE J，et al. Efficient bicarbonate removal and recovery of ammonium bicarbonate as CO₂ utilization using flow-electrode capacitive deionization［J］. Chemical Engineering Journal，2022，431：133961.
[12]	DOORNBUSCH G J，DYKSTRA J E，BIESHEUVEL P M，et al. Fluidized bed electrodes with high carbon loading for water desalination by capacitive deionization［J］. Journal of Materials Chemistry A，2016，4（10）：3642- 3647.
[13]	PARK H R，CHOI J，YANG S，et al. Surface-modified spherical activated carbon for high carbon loading and its desalting performance in flow-electrode capacitive deionization［J］. RSC Advances，2016，6（74）：69720- 69727.
[14]	ZHANG C，MA J，WU L，et al. Flow electrode capacitive deionization（FCDI）：recent developments，environmental applications，and future perspectives［J］. Environmental Science & Technology，2021，55（8）：4243- 4267.
[15]	CHO Y，YOO C Y，LEE S W，et al. Flow-electrode capacitive deionization with highly enhanced salt removal performance utilizing high-aspect ratio functionalized carbon nanotubes［J］. Water Research，2019，151：252- 259.
[16]	CAI Y M，ZHAO X T，WANG Y，et al. Enhanced desalination performance utilizing sulfonated carbon nanotube in the flow-electrode capacitive deionization process［J］. Separation and Purification Technology，2020，237：116330.
[17]	SASI S，MURALI A，NAIR S V，et al. The effect of graphene on the performance of an electrochemical flow capacitor［J］. Journal of Materials Chemistry A，2015，3（6）：2717- 2725.
[18]	TANG K X，YIACOUMI S，LI Y P，et al. Enhanced water desalination by increasing the electroconductivity of carbon powders for high-performance flow-electrode capacitive deionization［J］. ACS Sustainable Chemistry & Engineering，2019，7（1）：1085- 1094.
[19]	ZHANG J，XU B，WANG Z，et al. Efficient phosphorus removal from ultra-low concentration wastewater by flow-electrode capacitive deionization［J］. Separation and Purification Technology，2024，341：125521.
[20]	HATZELL K B，HATZELL M C，COOK K M，et al. Effect of oxidation of carbon material on suspension electrodes for flow electrode capacitive deionization［J］. Environmental Science & Technology，2015，49（5）：3040- 3047.
[21]	WU Q Y. Research on preparation of biochar from pharmaceutical sludge for adsorption and catalytic degradation of levofloxacin［D］. Wuxi：Jiangnan University，2022. 吴钦岳. 制药污泥制备生物炭吸附和催化降解左氧氟沙星的研究［D］. 无锡：江南大学，2022.
[22]	LIU Y L，YIN H H，WANG X，et al. Main hydrochemical characteristics and ion sources of Yongding River［J］. Environmental Engineering，2025，43（2）：87- 95. 刘烨凌，尹慧慧，王璇，等. 永定河主要水化学特征及离子来源［J］. 环境工程，2025，43（2）：87- 95.
[23]	CHENG L L. Comparative study on adsorption performance of biochar by KOH activation［D］. Dalian：Dalian Maritime University，2017. 程璐璐. KOH 活化法对生物炭吸附性能的比较研究［D］. 大连：大连海事大学，2017.
[24]	CHU M，TIAN W，ZHAO J，et al. A comprehensive review of capacitive deionization technology with biochar-based electrodes:biochar-based electrode preparation，deionization mechanism and applications［J］. Chemosphere，2022，307：135908.
[25]	YANG R，XU X，TENG J，et al. Porous carbon flow-electrode derived from modified MOF-5 for capacitive deionization［J］. Desalination，2024，569：117242.
[26]	LIANG D，ZHANG H Z，MA X C，et al. MOFs-derived core-shell Co₃Fe₇@Fe₂N nanoparticles supported on rGO as high-performance bifunctional electrocatalyst for oxygen reduction and oxygen evolution reactions［J］. Materials Today Energy，2020，17：100490.
[27]	SARAC A S，ATES M，KILIC B. Electrochemical impedance spectroscopic study of polyaniline on platinum，glassy carbon and carbon fiber microelectrodes［J］. International Journal of Electrochemical Science，2008，3（7）：777- 786.
[28]	QIAN T，WANG Y，FAN T，et al. A new insight into the immobilization mechanism of Zn on biochar：the role of anions dissolved from ash［J］. Scientific Reports，2016，6：33630.
[29]	ZHANG C，CHENG X，WANG M，et al. Phosphate recovery as vivianite using a flow-electrode capacitive desalination（FCDI）and fluidized bed crystallization（FBC）coupled system［J］. Water Research，2021，194：116918.
[30]	WANG L，ZHANG Z J，WANG T Y，et al. Effect of pore size distribution of carbon black flow electrode on desalination performance of flow-electrode capacitive deionization［J］. Chinese Journal of Environmental Engineering，2023，17（3）：795- 805. 王亮，张子健，王天玉，等. 炭黑流动电极的孔径分布对流动电极电容去离子脱盐性能的影响［J］. 环境工程学报，2023，17（3）：795- 805.
[31]	ZHANG C，WANG M，XIAO W，et al. Phosphate selective recovery by magnetic iron oxide impregnated carbon flow-electrode capacitive deionization（FCDI）［J］. Water Research，2021，189：116648.
[32]	HASSANYAND A，CHEN G Q，WEBLEY P A，et al. An investigation of the impact of fouling agents in capacitive and membrane capacitive deionisation［J］. Desalination，2019，457：96- 102.
[33]	SUWAL S，DOYEN A，BAZINET L. Characterization of protein，peptide and amino acid fouling on ion-exchange and filtration membranes:review of current and recently developed methods［J］. Journal of Membrane Science，2015，496：267- 283.
[34]	DAMMAK L，FOUILOUX J，BDIRI M，et al. A review on ion-exchange membrane fouling during the electrodialysis process in the food industry，part 1：types，effects，characterization methods，fouling mechanisms and interactions［J］. Membranes，2021，11（10）：761.
[35]	JING G L，WANG X Y，ZHAO H. Influence of polymer-containing wastewater on ion-exchange membrane fouling［J］. Journal of Harbin Institute of Technology，2007，39（8）：1249- 1252. 荆国林，王晓玉，赵海. 含聚污水对离子交换膜污染的影响［J］. 哈尔滨工业大学学报，2007，39（8）：1249- 1252.
[36]	CIFUENTES-ARAYA N，POURCELLY G，BAZINET L. Impact of pulsed electric field on electrodialysis process performance and membrane fouling during consecutive demineralization of a model salt solution containing a high magnesium/calcium ratio［J］. Journal of Colloid and Interface Science，2011，361（1）：79- 89.
[37]	BDIRI M，LARCHET C，DAMMAK L. A review on ion-exchange membranes fouling and antifouling during electrodialysis used in food industry cleanings and strategies of prevention［J］. Chemistry Africa，2020（3）：609- 633.