[1]牛云峰,孔海霞,聂守田,等.钙离子对短程反硝化污泥膨胀与脱氮性能影响[J].中国给水排水,2026,42(19):11-18.
　NiuYunfeng,KongHaixia,NieShoutian,et al.Calcium Addition for Sludge Bulking Control and Enhanced Nitrogen Removal in Partial Denitrification[J].China Water & Wastewater,2026,42(19):11-18.

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钙离子对短程反硝化污泥膨胀与脱氮性能影响

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第42卷期数: 2026年第19期页码: 11-18 栏目: 出版日期: 2026-10-01

Title:: Calcium Addition for Sludge Bulking Control and Enhanced Nitrogen Removal in Partial Denitrification

作者:: 牛云峰¹，孔海霞²，聂守田²，杜喜燕³，吕永涛³; （1.鄂尔多斯市东胜区水务投资建设集团有限公司，内蒙古鄂尔多斯 017099；2.中国市政工程华北设计研究总院有限公司西安分公司，陕西西安 710018；3.西安建筑科技大学环境与市政工程学院，陕西西安 710055）

Author(s):: Niu　Yunfeng¹， Kong　Haixia²， Nie　Shoutian²， Du　Xiyan³， Lü　Yongtao³; （1. Ordos Dongsheng District Water Investment and Construction Group Co. Ltd.， Ordos 017099， China； 2. Xi’an Branch， North China Municipal Engineering Design & Research Institute Co. Ltd.， Xi’an 710018， China； 3. School of Environmental and Municipal Engineering， Xi’an University of Architecture and Technology， Xi’an 710055， China）

关键词:: 关键词：短程反硝化; 钙离子; 胞外聚合物; 污泥膨胀; 反硝化菌

Keywords:: partial denitrification; calcium ion; extracellular polymeric substances; sludge bulking; denitrifying bacteria

摘要:: 短程反硝化（PD）可为厌氧氨氧化提供稳定的电子受体亚硝酸盐，但其絮体污泥易发生膨胀，导致污泥流失与处理性能下降。本研究通过投加钙离子（Ca²⁺），考察其对PD系统污泥特性、胞外聚合物（EPS）结构与组分、微生物群落及脱氮性能的影响。结果表明，投加Ca²⁺并提高浓度至100 mg/L，可使EPS中蛋白质与多糖比值（PN/PS）由1.24升至1.97，污泥中值粒径由31.3 μm增至62.2 μm，污泥体积指数（SVI）由260 mL/g降至165 mL/g，有效缓解污泥膨胀。同时，Ca²⁺投加使PD系统亚硝酸盐转化率由51.5%升至58.7%，系统消耗的碳氮比（C/N）由6.1±1.0降至5.3±0.9，碳源消耗减少可能驱动了EPS组分变化与SVI下降。高通量测序显示，Ca²⁺浓度提升增加了Ferruginibacter丰度，其分泌的EPS与Ca²⁺形成桥接作用，有利于构建致密絮体，这可能是引起SVI降低的关键功能菌。另一方面，Terrimonas丰度下降，系统仍维持较高的硝酸盐去除率，表明微生物群落演替未对整体硝酸盐还原功能造成明显不利影响。这为PD工艺的稳定运行提供了理论依据与技术支撑。

Abstract:: Partial denitrification (PD) can provide a stable nitrite electron acceptor for anaerobic ammonia oxidation, but its floc sludge is prone to bulking, leading to sludge loss and decreased treatment performance. This study investigated the effects of calcium ion (Ca²⁺) addition on sludge characteristics, structure and composition of extracellular polymeric substances (EPS), microbial community, and nitrogen removal performance in a PD system. The results showed that Ca²⁺ addition at a concentration of 100 mg/L could increase the protein-to-polysaccharide ratio (PN/PS) in EPS from 1.24 to 1.97 and increase the median sludge particle size from 31.3 μm to 62.2 μm, while decrease the sludge volume index (SVI) from 260 mL/g to 165 mL/g, thereby effectively alleviating sludge bulking. Concurrently, Ca²⁺ addition enhanced the nitrite transformation rate in the PD system from 51.5% to 58.7%, while the system’s consumed carbon-to-nitrogen ratio (C/N) decreased from 6.1±1.0 to 5.3±0.9. The reduction in carbon source consumption may have driven changes in EPS composition and the decrease in SVI. Furthermore, high-throughput sequencing analysis revealed that increased Ca²⁺ concentration elevated the abundance of Ferruginibacter, and its secreted EPS formed bridging interactions with Ca²⁺, which was beneficial for the formation of dense flocs. This genus may serve as a key functional microorganism in reducing SVI. On the other hand, despite the decline in the relative abundance of Terrimonas, the system maintained a high nitrate removal efficiency, indicating that microbial community succession did not exert an obvious adverse effect on the overall nitrate reduction function. This study provides theoretical and technical support for the stable operation of the PD process.

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更新日期/Last Update: 2026-10-01