环境工程学报2026，Vol.20Issue(4)：1091-1100,10.DOI:10.12030/j.cjee.202508036
新型复合缓释碳源制备条件优化及其脱氮性能分析
Preparation Optimization and Denitrification Performance Analysis of a Novel Composite Slow-Release Carbon Source
摘要
Abstract
To tackle the shortage of carbon sources and poor denitrification efficiency in rural domestic wastewater,a composite slow-release carbon source was developed and optimized using corn cob,rice husk,reed stalk,polyvinyl alcohol(PVA),and sodium alginate(SA).Preparation conditions and material ratios were systematically optimized through Plackett-Burman(PB)design,Box-Behnken design(BBD),and mixture-optimal design(MOD).The carbon release characteristics and denitrification performance of the composite carbon source were subsequently evaluated in batch and dynamic experiments.The optimal preparation conditions were determined as PVA 8.64 g,SA 2.41 g,rice husk 3.82 g,corncob 4.47 g,reed stem 6.06 g,freezing time 19.11 h,and crosslinking time 12 h.The cumulative carbon release reached 43.38±1.3 mg·g-1.The release profiles fitted well with first-order,Higuchi,Ritger-Peppas,and Weibull kinetic models,indicating that carbon diffusion and matrix erosion jointly governed the release process,resulting in stable slow-release performance.In denitrification experiments with an influent NO3--N concentration of 50 mg·L-1,the composite slow-release carbon source(RCR-PVA-SA)achieved a maximum removal efficiency of 90.8％and a removal rate of 0.079 mg·(g·h)-1after 10 days.Under dynamic conditions,when the hydraulic retention time(HRT)was 3 h,the average NO3--N removal efficiency remained as high as 87.9％.The RCR-PVA-SA exhibits stable carbon-release characteristics and excellent denitrification performance,serving as an efficient electron donor for the denitrification.This study provides valuable guidance for the preparation of natural slow-release carbon sources and the resource utilization of agricultural wastes.关键词
农村生活污水/缓释碳源/骨架材料/释碳动力学/反硝化脱氮Key words
rural domestic sewage/slow-release carbon source/skeleton material/carbon release kinetics/denitrifying nitrogen removal分类
资源环境引用本文复制引用
陈潇楠,顾佳艳,何国富,郭林睿,张瑞瑞..新型复合缓释碳源制备条件优化及其脱氮性能分析[J].环境工程学报,2026,20(4):1091-1100,10.基金项目
上海市崇明区水务局资助项目(2021FWR0083) （2021FWR0083）
