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J. Hefei Univ. Tech. (Nat. Sci.)

合肥工业大学学报(自然科学版)

JOURNAL OF HEFEI UNIVERSITY OF TECHNOLOGY (NATURAL SCIENCE)

Competent Authorities: Ministry of Education of the People's Republic of China

Sponsor by: Hefei University of Technology

ISSN 1000-1646, CN 34-1001/N

Study on the treatment of waste activated sludge by microbial fuel cell coupled with struvite crystallization

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MFC 耦合鸟粪石结晶工艺处理剩余污泥的研究

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Oct.2025, Vol.48 No.10: 1309-1316

DOI: 10.3969/j.issn.1003-5060.2025.10.003

Authors

LI Ziyue, WEI Lin, TANG Yiming, JI Junjie, KONG Jianyu, DING Xiaoke

(School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: Microbial fuel cell(MFC) coupled with struvite crystallization can simultaneously recover the abundant nutrients such as nitrogen and phosphorus from waste activated sludge(WAS) in municipal sewage treatment plants, thereby presenting promising application prospects in the WAS resource utilization. In this study, the effects of different cathodic electron acceptors on the electricity production performance of MFC were investigated. Through Box-Behnken based response surface methodology, the maximum power output of MFC under different initial pH values, temperatures and sludge inoculation ratios in the anolyte was simulated and predicted, and the optimal anode operating conditions were also obtained. Meanwhile, the recovery efficiency of nitrogen and phosphorus from the sludge supernatant after MFC operation by struvite crystallization and the properties of crystallization products were discussed. The results show that when potassium ferricyanide( $ K_{3}[Fe(CN)_{6}] $) is used as cathodic electron acceptor, the output voltage and maximum power density of MFC are 0.64 V and 2.66 W/m $ ^{3} $, respectively, which are 3.0 and 2.5 times higher than that of MFC with oxygen as cathodic electron acceptor. The optimal anode operating conditions are 55 °C, initial pH value of 9.8, and sludge inoculation ratio of 0.37, under which MFC achieves a maximum power density of 6.82 W/m $ ^{3} $. After MFC operation, the removal rate of phosphorus from the sludge supernatant by struvite crystal-

Keywords: waste activated sludge(WAS); microbial fuel cell(MFC); cathodic electron acceptor; Box-Behnken model; struvite crystallization

作者信息

李子越，韦林，汤一鸣，纪俊杰，孔建宇，丁晓可

（合肥工业大学资源与环境工程学院，安徽合肥230009）

摘要和关键词

摘要: 微生物燃料电池（microbial fuel cell，MFC）和鸟粪石结晶工艺同时回收城市生活污水厂剩余污泥中丰富的有机质氮、磷等营养物质，在剩余污泥资源化方面具有很好的应用前景。文章探究不同阴极电子受体对MFC产电性能的影响；基于Box-Behnken设计的响应面法，模拟和预测了不同阳极初始pH值、温度和污泥接种比的工作条件下MFC的最大功率输出，获取了阳极操作条件的优化参数；探讨鸟粪石结晶法回收MFC产电后污泥上清液中氮、磷的效率和结晶产物性质。结果表明：以 $ K_{3}[Fe(CN)_{6}] $作为MFC阴极电子受体时，MFC的输出电压和最大功率密度分别为0.64 V和2.66 W/m $ ^{3} $，是以氧气为MFC阴极电子受体时的3.0、2.5倍；MFC阳极操作条件的优化参数为55℃、初始pH值为9.8、污泥接种比为0.37时，MFC的最大功率密度为6.82 W/m $ ^{3} $，此时当pH值为9.0时鸟粪石结晶法对MFC产电后污泥上清液中磷的去除率高达94%以上。该研究成果为剩余污泥的资源化提供了一定的借鉴作用，有利于推动其工业化应用。

关键词: 剩余污泥；微生物燃料电池（MFC）；阴极电子受体；Box-Behnken模型；鸟粪石结晶

Funding

安徽省自然科学基金资助项目（2308085MD117）

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