WangXinyu,ShenLiqing,LuChangyu,et al.Pilot-scale Study on CO2 Addition for Coagulation Optimization and Aluminum Control[J].China Water & Wastewater,2026,42(17):67-72.
投加CO2优化混凝控铝中试研究
- Title:
- Pilot-scale Study on CO2 Addition for Coagulation Optimization and Aluminum Control
- Keywords:
- carbon dioxide; pH; aluminum control; coagulation
- 摘要:
- 针对夏季湿地原水温度超过30 ℃且pH>7.8导致混凝效率显著下降的难题，提出以二氧化碳（CO2）预处理替代传统聚合氯化铝（PAC）调节pH的控铝方法，并系统探究其对混凝效果的提升机制。结果表明，CO2预处理可精准调控原水pH至7.2，在此条件下V型滤池出水余铝浓度稳定低于0.02 mg/L，同时总悬浮固体（TSS）、溶解性有机碳（DOC）及高锰酸盐指数的去除率显著提升。通过对絮体的表征和测试Zeta电位发现，投加CO2后絮体平均粒径增加，结构变得更加致密，Zeta电位升高，表明其通过增强电中和作用与絮体密实度优化了混凝过程。
- Abstract:
- To address the challenge of significantly reduced coagulation efficiency caused by wetland source water temperatures exceeding 30 ℃ and pH greater than 7.8 in summer, a method of replacing traditional polyaluminum chloride (PAC) pH adjustment with carbon dioxide (CO2) pretreatment for aluminum control was proposed, and its underlying mechanism for improving coagulation performance was investigated. The results showed that CO2 pretreatment could precisely regulate the raw water pH to 7.2. Under this condition, the residual aluminum concentration in the effluent of the V-type filter remained consistently below 0.02 mg/L, while the removal rates of total suspended solids (TSS), dissolved organic carbon (DOC), and permanganate index were significantly enhanced. Floc characterization and Zeta potential measurements revealed that after CO2 addition, the average floc particle size increased and the floc structure became denser, accompanied by a rise in Zeta potential. These findings indicated that the coagulation process was optimized through enhanced charge neutralization and improved floc compactness.
相似文献/References:
[1]陈德放,李梅,张华军,等.投加二氧化碳控制出厂水铝含量的生产性试验[J].中国给水排水,2021,37(23):9.
CHEN De-fang,LI Mei,ZHANG Hua-jun,et al.Controlling Aluminum Content in Finished Water of Waterworks by Dosing Carbon Dioxide[J].China Water & Wastewater,2021,37(17):9.
[2]张存款,丁文川,曾晓岚,等.优化电化学MAP法高效去除垃圾渗滤液中的氨氮[J].中国给水排水,2022,38(9):25.
ZHANGCun-kuan,DINGWen-chuan,ZENGXiao-lan,et al.Optimized Electrochemical Magnesium Ammonium Phosphate Method for Efficient Ammonia Nitrogen Removal from Landfill Leachate[J].China Water & Wastewater,2022,38(17):25.
[3]薛冰超,范志浩,曾浩鑫,等.聚多巴胺修复PVDF损伤膜的影响因素及性能优化[J].中国给水排水,2026,42(17):34.
XueBingchao,FanZhihao,ZengHaoxin,et al.Influencing Factors and Performance Optimization of Polydopamine Biomimetic Repair of PVDF Damaged Membrane[J].China Water & Wastewater,2026,42(17):34.