Application study of biocarbon-enhanced Fenton technology for treating refractory organic wastewater

doi:10.19965/j.cnki.iwt.2025-0243

Abstract

Abstract:

In order to solve the problem of removing refractory organic matter in the deep treatment of industrial wastewater, self-made biochar(BAC) applied as a co-catalyst into the traditional Fenton system, and the treatment efficiency of secondary biochemical effluent in a pharmaceutical industrial park in Sichuan was investigated. The results showed that the addition of self-made BAC significantly increased the COD removal rate from 34.0% in the traditional Fenton method to 78.5%, and COD in the effluent was reduced from 130-150 mg/L initially to less than 30 mg/L, meeting the standard of Class Ⅳ water in Environmental Quality Standard for Surface Water (GB 3838—2002). The introduction of BAC not only promoted the generation of ·OH, but also improved the agulation sedimentation performance of the system. Correlation analysis showed that the reinforcement of Fenton reaction by BAC was mainly due to its C $̿$ O, carbon defects and conductivity. In addition, the optimized BAC/Fe²⁺/H₂O₂ system could effectively reduce the COD in water over a wide pH range (3-7). BAC could be reused for 4 times without regeneration. Therefore, BAC was an ideal environmental friendly co-catalyst material for Fenton reaction, which had engineering application prospects in the field of deep treatment of industrial wastewater.

Key words: biochar, Fenton reaction, co-catalyst, refractory organic matter

摘要：

为解决工业废水深度处理中难降解有机物去除的难题，将自制生物炭（BAC）作为助催化剂应用于传统Fenton体系中，考察体系对四川某制药工业园区二级生化出水的处理效能。结果表明，自制BAC的投加使COD去除率从传统Fenton法的34.0%显著提升至78.5%，出水COD由初始的130~150 mg/L降至30 mg/L以下，达到《地表水环境质量标准》（GB 3838—2002）Ⅳ类水标准。BAC的引入不仅促进了·OH的生成，还改善了体系的混凝沉降性能。相关性分析表明，BAC对Fenton反应的强化作用主要源于其C $̿$ O、碳缺陷及良好的导电性。此外，优化后的BAC/Fe²⁺/H₂O₂体系在较宽的pH范围（3~7）内均能有效降低水中的COD，且BAC在不经再生的情况下可重复使用4次。因此，BAC作为Fenton反应的理想环保型助催化剂材料，在工业废水深度处理领域具有广阔的工程应用前景。

关键词: 生物炭, Fenton反应, 助催化剂, 难降解有机物

CLC Number:

X703.1

Qian WANG, Kunming HUANG, Runyun FENG, Huaimin ZHANG, Jiangrong LI, Siqiang LIU. Application study of biocarbon-enhanced Fenton technology for treating refractory organic wastewater[J]. Industrial Water Treatment, 2026, 46(2): 142-149.

王倩, 黄昆明, 冯润芸, 张怀民, 李江荣, 刘思强. 生物炭强化Fenton技术处理难降解有机废水的应用研究[J]. 工业水处理, 2026, 46(2): 142-149.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2025-0243

https://www.iwt.cn/EN/Y2026/V46/I2/142

Figures/Tables 12

Table 1 Physical and chemical parameters of self-made BAC

样品	比表面积/（m²·g^-1）	粒径/nm	C $̿$ O/%	O—C—O/%	缺陷密度/cm^-2	电导率/（S·m^-1）
BAC	857	2.55	16.29	11.96	2.65×10¹¹	2.53

Table 1 Physical and chemical parameters of self-made BAC

样品	比表面积/（m²·g^-1）	粒径/nm	C $̿$ O/%	O—C—O/%	缺陷密度/cm^-2	电导率/（S·m^-1）
BAC	857	2.55	16.29	11.96	2.65×10¹¹	2.53

Fig.1 The removal effect of COD in different systems

Fig.2 The effect of free radical scavenger on the degradation efficiency of BAC/Fe²⁺/H₂O₂

Fig.3 ESR spectra of BAC/H₂O₂ system and BAC/Fe²⁺/H₂O₂ system

Fig.4 Sedimentation performance（a）and effluent comparison（b）of Fe²⁺/H₂O₂ and BAC/Fe²⁺/H₂O₂ systems

Fig.5 Analysis of the correlation between BAC index and degradation performance of enhanced Fenton system

Fig.6 The concentration changes of Fe²⁺ and Fe³⁺ in Fe²⁺/H₂O₂ system （a） and BAC/Fe²⁺/H₂O₂ system （b）

Fig.7 The influence of H₂O₂ dosage on the degradation efficiency of BAC/Fe²⁺/H₂O₂ system

Fig.8 The influence of FeSO₄·7H₂O dosage on the degradation efficiency of BAC/Fe²⁺/H₂O₂ system

Fig.9 The influence of BAC dosage on the degradation efficiency of BAC/Fe²⁺/H₂O₂ system

Fig.10 The influence of pH on the degradation efficiency of BAC/Fe²⁺/H₂O₂ system

Fig.11 The reuse performance of BAC

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