鸟粪石循环利用处理高氨氮废水的热解行为

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1、第7卷第7期环境工程学报Vol．7，No．72013年7月ChineseJournalofEnvironmentalEngineeringJul．2013鸟粪石循环利用处理高氨氮废水的热解行为曾庆玲王露沈春花李飞(华侨大学土木工程学院，厦门361021)摘要为了循环利用鸟粪石处理高氨氮废水，探讨了鸟粪石煅烧与加碱热解的脱氮率，利用电镜扫描(SEM)和X射线衍射(XＲD)对2种热解产物进行了分析。鸟粪石煅烧条件为:温度100～225℃，时间1～5h;加碱热解条件为:温度60～－+95℃，时间0.5～4h，加碱量OH∶NH4摩尔比值0.4～1.5。结果表明，虽然XＲD分析显示2种热

2、解产物都已失去鸟粪石－+的特征峰，但是鸟粪石加碱热解效果更好，最佳热解条件为:加碱量OH∶NH4摩尔比值1，温度90℃，时间2h，鸟粪石脱氮率95%以上;加碱热解产物表面为多孔状，完全失去了晶体结构;煅烧热解鸟粪石脱氮率仅为80%左右，热解产物晶体结构破坏不完全。鸟粪石在最佳条件下热解循环处理高氨氮废水，可循环使用6次，氨氮去除率80%以上，出水磷浓度小于8mg/L。关键词鸟粪石热解脱氮率电镜扫描X射线衍射中图分类号X703文献标识码A文章编号1673-9108(2013)07-2541-06Thermaldecompositionbehaviorofstruviteinrec

3、yclingtreatmentofhighammonia-nitrogenwastewaterZengQinglingWangLuShenChunhuaLiFei(CollegeofCivilEngineering，HuaqiaoUniversity，Xiamen361021，China)AbstractInordertotreathighammonia-nitrogenwastewaterbystruvitereuse，thethermaldecompositionofstruvitewasstudied．Thedenitrificationratesofstruvitewe

4、restudiedbycalcinationandheatunderalkalicon-ditionsseparately．Thethermaldecompositionresidueswereanalyzedbyscanningelectronmicroscope(SEM)andX-raydiffraction(XＲD)．Thetemperatureforstruvitecalcinationwasbetween100～225℃;calcinationtimerangedfrom1～5hours．Whenthestruvitewasheatedunderalkalicondi

5、tions，thetemperaturewasbe-－+tween60～95℃;themolarratioofOH∶NH4was0.4～1.5;andheatedtimewas0.5～4hours．AnalysiswithXＲDshowedthatthecharacteristicpeaksofstruvitewereabsentinboththetwokindsofthermaldecomposi-tionresidues，butthealkalimethodwasbetter．Thedenitrificationrateofstruvitecouldreach95%unde

6、ralkali－+conditions，whenOH∶NH4molarratiowas1，temperaturewas90℃andbeingheatedfor2hours．SEManaly-sisshowedthatthethermaldecompositionresidueswasporoussurfaceandlostcrystalstructurecompletelyunderalkaliconditions，butthecrystalstructurewasnotdestroyedcompletelywhenstruvitewascalcinedwithadenitri

7、-ficationrateof80%only．Thestruvitecouldbereusedforsixtimesforthehighammonia-nitrogenwastewatertreatmentunderbestcondition，witharemovalrateofammonia-nitrogenover80%，andtheconcentrationofphosphatewaslowerthan8mg/L．Keywordsstruvite;thermaldecompositio