近日，宁波诺丁汉大学邵媛媛团队实现了熔融混合碳源颗粒在低碳氮比废水中同步反硝化的可调碳释放。该研究于2025年11月6日发表在《颗粒学报》杂志上。

在低碳氮比废水处理中，实现同步碳释放与反硝化（SCRD）仍是固体碳源（SCSs）面临的关键挑战。

研究组通过结构设计开发了组分可调的熔融共混高级碳源（MB-ACSs），以玉米芯（CC）和聚羟基丁酸酯（PHB）在聚乙烯（PE）基体中形成不同组分构成的互穿网络，实现对孔隙率与扩散速率的精确调控。其中MB-433（PE 40 wt.%，PHB 30 wt.%，CC 30 wt.%）展现出最均衡的结构特性，整合了CC的快速溶出、PHB的缓释功能及PE的骨架支撑优势。所有MB-ACSs均呈现双相释放模式——初始表面溶解与后续内部扩散协同作用，而MB-433能维持与微生物需求理想匹配的稳定碳供应。

在不同硝酸盐负荷（25-1000 mg NO₃^--N/L）和碳氮比（0, 1.5, 3）条件下的反硝化实验表明：MB-433在中等负荷（25-50 mg NO₃^--N/L）下持续实现60-80%的硝酸盐去除率；在高负荷高碳氮比条件（1000 mg NO₃^--N/L，C/N=3）下无抑制现象；即便无外加碳源（C/N=0）仍能维持完全反硝化。逻辑斯蒂与指数拟合证实MB-433具有优异的SCRD能力，莫诺模型进一步揭示其具备高反硝化潜力（V_max=0.172 mg/L·d）与强硝酸盐亲和性（K_s=8.42 mg/L）。

附：英文原文

Title: Tunable carbon release from melt-blended carbon source particles for simultaneous denitrification in low-C/N wastewater

Author: Yuanyuan Shao c

Issue&Volume: 2025/11/06

Abstract: Achieving simultaneous carbon release and denitrification (SCRD) remains a key challenge for solid carbon sources (SCSs) in low-C/N wastewater treatment. In this project, novel melt-blended advanced carbon sources (MB-ACSs) with tunable compositions were developed to regulate SCRD through structural design, where MB-ACSs were engineered to form interpenetrating networks with controllable porosity and diffusivity based on the different compositions of corn cob (CC) and polyhydroxybutyrate (PHB) within a polyethylene (PE) matrix. Among them, MB-433 (40 wt.% PE, 30 wt.% PHB, 30 wt.% CC) exhibited the most balanced structure, integrating rapid CC-derived dissolution, PHB-mediated sustained release, and PE-supported stability. All MB-ACSs displayed a biphasic release pattern – initial surface dissolution followed by internal diffusion – whereas MB-433 maintained a steady carbon supply ideally synchronized with microbial demand. Denitrification assays conducted across a wide range of nitrate loads (25-1000 mg NO3--N/L) and C/N (0, 1.5, 3) showed that MB-433 consistently achieved 60-80% nitrate removal under moderate conditions (25-50 mg NO3--N/L), avoided inhibition under high-loading and high-carbon conditions (1000 mg NO3--N/L, C/N=3), and maintained complete denitrification even in the absence of external carbon (C/N=0). Logistic and exponential fittings confirmed MB-433’s superior capacity on SCRD, while Monod modeling revealed high denitrification potential (Vmax=0.172 mg/L d) and strong nitrate affinity (Ks=8.42 mg/L).

DOI: 10.1016/j.partic.2025.10.021

Source: https://www.sciencedirect.com/science/article/abs/pii/S1674200125002949