Research Progress on the Role of Biochar in COD Degradation in Wastewater

Zhangyao Suo; Anrui Li; Xueyan Li; Andan Wang; Rui Fan; Jie Yang; Xurundong Kan; Jianqiang Zhang

doi:10.62051/ijnres.v5n3.26

Authors

Zhangyao Suo
Anrui Li
Xueyan Li
Andan Wang
Rui Fan
Jie Yang
Xurundong Kan
Jianqiang Zhang

DOI:

https://doi.org/10.62051/ijnres.v5n3.26

Keywords:

Biochar; COD Removal; Wastewater Treatment; Adsorption Mechanisms; Catalytic Degradation.

Abstract

Biochar has emerged as a promising eco-friendly material for addressing chemical oxygen demand (COD) in wastewater treatment, offering sustainable alternatives to conventional purification methods. This review systematically examines its multifunctional roles through physicochemical characteristics including developed surface area, porous structure, and surface functional groups that collectively enable effective COD removal via adsorption, catalytic degradation, and microbial interactions. The oxidation-reduction reactions facilitated by persistent free radicals and oxygen-containing functional groups demonstrate particular effectiveness in decomposing complex organic pollutants. Recent advances highlight optimization strategies through precursor selection, pyrolysis condition modification, and hybrid systems combining biochar with advanced oxidation processes or biological treatments, which synergistically enhance treatment efficiency and operational stability. Practical applications reveal biochar's adaptability across various wastewater types, though performance variations depend on feedstock sources, activation methods, and reactor configurations. Environmental sustainability assessments indicate reduced secondary pollution risks compared to traditional chemical treatments, with potential for resource recovery through spent biochar utilization in soil amendment. Current challenges center on long-term stability in continuous flow systems, cost-effective regeneration techniques, and standardized evaluation protocols for industrial-scale implementation. Future research directions emphasize biochar-based composite material development, artificial intelligence-assisted process optimization, and life-cycle assessment frameworks to advance circular economy applications in water pollution control.

References

[1] Dou Z , Li C, Ji X, et al. Efficient degradation of tetracycline in wastewater by novel biochar-based photocatalytic materials: performance, photocatalytic mechanism and degradation pathways[J]. Research on Chemical Intermediates, 2025, 51(1):111-134.DOI:10.1007/s11164-024-05451-x.

[2] Zhu Q, Liu X, Xiang, Jingjing Li, LikunFu, BenquanWang, YiHuang, YanjunFan, GuozhiZhang, Lei.Efficient degradation of COD from coking wastewater by corncob biochar-modified particles using a three-dimensional electrode reactor[J].Environmental science: Water research & technology, 2023, 9(6):1717-1728.

[3] Tumanyisibwe A, Nasr M, Fujii M, et al. Anaerobic Digestion of Dye Wastewater and Agricultural Waste with Bio-Energy and Biochar Recovery: A Techno-Economic and Sustainable Approach[J]. Water (20734441), 2024, 16(14).DOI:10.3390/w16142025.

[4] Manga M, Kaboggoza H C, Semiyaga S, et al. Biochar for remediation of petroleum hydrocarbons in soil, sediments, and sludge[J]. Biochar for Environmental Remediation, 2025:149-166.

[5] Mojiri A.Treatment of Water and Wastewater: Challenges and Solutions[J].Separations (2297-8739), 2023, 10(7). DOI:10.3390/separations10070385.

[6] Yu Y. The Enhancing Effect of Biochar Derived from Biogas Residues on the Anaerobic Digestion Process of Pig Manure Water[J]. Fermentation, 2024, 10.DOI:10.3390/fermentation10120644.

[7] Gvoic V, Prica M, Sekulic M T, et al. Synergistic effect of Fenton oxidation and adsorption process in treatment of azo printing dye: DSD optimization and reaction mechanism interpretation[J]. Environmental technology, 2024(9/12):45.DOI:10.1080/09593330.2022.2154082.

[8] Li Z, Deng S, An Q, et al. Application of Activated Persulfate via Red Mud-Based Catalysts for Dye Removal in Wastewater: Kinetics and Mechanism[J]. Environmental Engineering Science, 2024, 41(2). DOI:10.1089/ees.2023.0164.

[9] Zhang Y, Yao Z, Ma J, et al. A novel strategy for enhancing electron transfer by adding BC/AQS in the anaerobic digestion of agriculture waste: Focusing on the interaction between quinone/C=O and microbes[J]. Energy, 2025, 318. DOI:10.1016/j.energy.2025.134788.

[10] Yu C, Yan C, Jiyan Gu Yiran Zhang Xinxin Li Zhenhua Dang Lei WangJun Wan Jingwen Pan. In-situ Cu-loaded sludge biochar catalysts for oxidative degradation of bisphenol A from high-salinity wastewater[J].Journal of cleaner production, 2023, 427(Nov.15):139334.1-139334.10.DOI:10.1016/j.jclepro.2023.139334.

[11] Chen X , Zhou Y , He J ,et al.Elevated efficiency in tartrazine removal from wastewater through boron-doped biochar: enhanced adsorption and persulfate activation[J].Biochar, 2024, 6(1):1-22.DOI:10.1007/s42773-024-00377-4.

[12] Pan F , Huang F , Wang Y ,et al.Effects of Rice Husk Biochar Attachment Biofilm with Microorganisms on Nitrogen Removal of Digested Swine Wastewater[J].BioResources, 2024, 19(3).DOI:10.15376/biores.19.3.6264-6280.

[13] Mishra S R , Gadore V , Ahmaruzzaman M .Advances in Sustainable Water Treatment: Photocatalytic Removal of Pharmaceuticals from Wastewater with Biochar-Based Nanocomposites[C]//International Conference on Water Resources, Ocean and Environmental Engineering.Springer, Singapore, 2025.DOI:10.1007/978-981-97-7502-6_11.

[14] Akaniro I R , Zhang R , Tsang C H M ,et al.Engineered digestate-derived biochar mediated peroxymonosulfate activation for oxytetracycline removal in sustainable wastewater remediation[J].Environmental Pollution, 2024(Nov.):360.DOI:10.1016/j.envpol.2024.124640.

[15] Yao C, Wang B, Zhang J, et al. Formation mechanisms and degradation methods of polycyclic aromatic hydrocarbons in biochar: A review[J].Journal of Environmental Management, 2024, 357(000):14.DOI:10.1016/j.jenvman.2024.120610.

[16] Amdeha E .Biochar-based nanocomposites for industrial wastewater treatment via adsorption and photocatalytic degradation and the parameters affecting these processes[J].Biomass Conversion and Biorefinery, 2024, 14(19):23293-23318.DOI:10.1007/s13399-023-04512-2.

[17] Dudziak M , Bhatia R , Dey R ,et al.Wastewater phosphorus enriched algae as a sustainable flame retardant in polylactide[J].Polymer Degradation and Stability, 2024:227.

[18] Wang W , Kong F , Wu H ,et al.Enhanced Removal of Dissolved Effluent Organic Matter in Wastewater Using Lignin-Based Biochar Supported Fe–Cu Bimetallic Oxide Catalyst[J].Journal of Marine Science and Engineering, 2024, 12(1):20.DOI:10.3390/jmse12010183.

[19] Ding J , Zhen F , Kong X ,et al.Effect of Biochar in Modulating Anaerobic Digestion Performance and Microbial Structure Community of Different Inoculum Sources[J]. Fermentation-Basel, 2024, 10(3):16.DOI:10.3390/fermentation10030151.

[20] Twagirayezu G , Cheng H , Wu Y ,et al.Insights into the influences of biochar on the fate and transport of pesticides in the soil environment: a critical review[J].Biochar, 2024, 6(1).DOI:10.1007/s42773-024-00301-w.

[21] Anonymous.Degradation of tetracycline wastewater by suspended biochar as carriers in moving bed biofilm reactor(vol 86, page 1578, year 2022)[J].Water Science and Technology, 2023(1/3):87.

[22] Singh A K, Giannakoudakis D A A, Arkas, Michael Triantafyllidis, Konstantinos S. S. Nair, Vaishakh. Composites of Lignin-Based Biochar with BiOCl for Photocatalytic Water Treatment: RSM Studies for Process Optimization[J]. nanomaterials, 2023, 13(4).DOI:10.3390/nano13040735.

[23] Improved remediation of amoxicillin-contaminated water by floating treatment wetlands intensified with biochar, nutrients, aeration, and antibiotic-degrading bacteria[J]. Bioengineered, 2023, 14(1): -.DOI:10.1080/21655979.2023.2252207.

[24] Milivojevi M .Biochar as an Enzyme Immobilization Support and Its Application for Dye Degradation[J]. Processes, 2024, 12.DOI:10.3390/pr12112418.

[25] Kahkeci J , Aoudi B ,Isaac Sánchez-Montes,et al.Engineered biochar supported bismuth tungstate: Unveiling the influence of precursor concentrations and biochar dosage for the solar photocatalysis of 1,3-diphenylguanidine in secondary municipal effluent[J].Chemical Engineering Journal, 2024, 483(000):13.DOI:10.1016/j.cej.2024.149142.

[26] Ioannidi A A , Frigana A , Vakros J ,et al.Persulfate Activation Using Biochar from Pomegranate Peel for the Degradation of Antihypertensive Losartan in Water: The Effects of Pyrolysis Temperature, Operational Parameters, and a Continuous Flow Reactor[J].Catalysts (2073-4344), 2024, 14(2).DOI:10.3390/catal14020127.