岩石矿物学杂志2026，Vol.45Issue(1)：147-156,10.DOI:10.20086/j.cnki.yskw.2026.5045
镁钙比对有机废物厌氧消化液中生物矿化产物的制约
The influence of Mg/Ca ratio on biomineralization products in anaerobic digestion liquor of organic waste
摘要
Abstract
Anaerobic digestate from organic waste typically exhibits high concentrations of chemical oxygen demand(COD),phosphate and ammonia nitrogen,classifying it as recalcitrant high-strength organic wastewater.This study proposes supplementing digestate with sulfate as an electron acceptor for sulfate-reducing bacteria,aiming to rapidly degrade organic matter while inducing biomineralization to fix carbon,nitrogen,and phosphorus.To investigate the influence of magnesium and calcium ions on COD removal,biomineralization products,and carbon fixation in anae-robic digestate,batch biomineralization experiments were conducted using anaerobic systems with varying magnesi-um and calcium ion concentrations.The results show that under a total salinity of 10 g/L and a Mg2+/Ca2+molar ra-tio ranging from 0.5 to 10,increasing the Mg2+concentration from 0.12 g/L to 2.4 g/L boosted total organic car-bon(TOC)degradation rates initially,but then caused them to decline.The optimal degradation rate was achieved at a Mg2+/Ca2+molar ratio of 5,corresponding to 1.2 g/L of Mg2+.Furthermore,when the Mg2+/Ca2+molar ratio was less than 1,calcite and struvite were the primary mineralization products,whereas monohydrocalcite and stru-vite prevailed for ratios above 1.These findings suggest that Ca2+mainly facilitates carbon capture,while Mg2+is crucial for immobilizing nitrogen and phosphorus.Consequently,the Mg2+/Ca2+molar ratio serves as a key regula-tor of controlling both the types and proportions of carbonate and phosphate phases.关键词
硫酸盐还原菌/有机废物/厌氧消化/固碳/单水方解石/鸟粪石Key words
sulfate reducing bacteria/organic waste/anaerobic digestion/carbon sequestration/struvite/mono-hydrocalcite分类
天文与地球科学引用本文复制引用
严默涵,陈天虎,李雅倩,李静茹,周跃飞,谢巧勤..镁钙比对有机废物厌氧消化液中生物矿化产物的制约[J].岩石矿物学杂志,2026,45(1):147-156,10.基金项目
国家自然科学基金项目(42372050) （42372050）
合肥市揭榜挂帅项目(GJ2022SH12) National Natural Science Foundation of China(42372050) （GJ2022SH12）
Open Bidding for Selecting the Best Candidates of Hefei(GJ2022SH12) （GJ2022SH12）
