Mg^2+、Ca^2+对厌氧消化系统中CO2的捕获和营养盐的回收

中国环境科学2019,39(7)：2804~2811ChinaEnvironmentalScienceMg2+、Ca2+对厌氧消化系统中CO2的捕获和营养盐的回收龚林林1,张衍1,2,3,姜倩倩1,崔敏华1,2,3,刘和1,2,3*,章湝1(1.江南大学环境与土木工程学院,江苏无锡214122；2.江南大学江苏省厌氧生物技术重点实验室,江苏无锡214122；3.江苏省水处理技术与材料协同创新中心,江苏苏州215009)摘要：为探究矿物碳酸化与污泥厌氧消化耦合过程中实现CO2捕获和N/P营养盐协同回收的可行性,在污泥水解液为底物的厌氧消化系统中,研究不同比例Mg2+/Ca2+离子添加对厌氧消化系统中CO2捕获和营养盐的协同回收效果的影响.结果表明,添加Mg2+/Ca2+离子为(20mmol/L)/(0mmol/L)、(10mmol/L)/(10mmol/L)和(0mmol/L)/(20mmol/L)均可促进有机质降解,使沼气产量分别提升16.97%、21.56%和23.99%,并使CO2含量由27.27%分别下降至24.81%,22.06%和21.98%.不同比例Mg2+/Ca2+离子添加可使磷酸根浓度下降63.46%~66.47%,但仅Mg2+/Ca2+离子以(20mmol/L)/(0mmol/L)和(10mmol/L)/(10mmol/L)添加的实验组中氨氮浓度得到下降.XRD分析揭示,Mg2+/Ca2+离子以(20mmol/L)/(0mmol/L)、(10mmol/L)/(10mmol/L)和(0mmol/L)/(20mmol/L)添加时分别使厌氧消化系统中形成鸟粪石和碳酸镁、鸟粪石和方解石、方解石和三斜磷钙石.Mg2+、Ca2+离子等摩尔量联合添加可实现最优的CO2捕获和营养盐协同回收效果.关键词：污泥；厌氧消化；矿物碳酸化；CO2捕获；营养盐回收中图分类号：X703文献标识码：A文章编号：1000-6923(2019)07-2804-08CO2sequestrationandnutrientsrecoveryinanaerobicdigestionwithMg2+andCa2+addition.GONGLin-lin1,ZHANGYan1,2,3,JIANGQian-qian1,CUIMin-hua1,2,3,LIUHe1,2,3*,ZHANGJie1(1.SchoolofEnvironmentandCivilEngineering,JiangnanUniversity,Wuxi214122,China；2.JiangsuKeyLaboratoryofAnaerobicBiotechnology,JiangnanUniversity,Wuxi214122,China；3.JiangsuCollaborativeInnovationCenterofWaterTreatmentTechnologyandMaterial,Suzhou215009,China).ChinaEnvironmentalScience,2019,39(7)：2804~2811Abstract：InordertoexplorethefeasibilityofsimultaneousCO2sequestrationandN/Pnutrientsrecoveryinsludgeanaerobicdigestioncoupledwithmineralcarbonation,differentratiosofMg2+/Ca2+wereaddedintheanaerobicdigestionsystemswithsludgehydrolysateassubstrate,toinvestigatetheperformanceofsimultaneousCO2sequestrationandnutrientsremoval.TheresultsshowedthattheadditionofMg2+/Ca2+of(20mmol/L)/(0mmol/L),(10mmol/L)/(10mmol/L)and(0mmol/L)/(20mmol/L)couldpromotethedegradationoforganicmatters,sothatthebiogasproductionincreasedby16.97%,21.56%and23.99%,andtheCO2contentwasreducedfrom27.27%to24.81%,22.06%and21.98%,respectively.Thephosphateconcentrationwasreducedby63.46%~66.47%withMg2+/Ca2+additionofdifferentratios.How