光合细菌脱氮除磷机理及应用研究

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1、光合细菌脱氮除磷机理及应用研究环境科学专业研究生：曹攀指导教师：龙炳清摘要：本文首先通过与传统活性污泥脱氮除磷效果的对比试验，论证光合细菌的脱氮除磷机理，最后试验得出：光合细菌的脱氮机质是通过好氧直接吸收分解和厌氧反硝化作用达到脱氮效果；而无论在好氧还是厌氧条件下，光合细菌的除磷机质都是通过直接吸收分解达到除磷效果。然后，本文对光合细菌进行应用试验研究，分别研究了游离光合细菌和固定化光合细菌脱氮除磷的最适宜工艺条件及其处理效果，最后通过试验得出：游离光合细菌脱氮除磷的最适宜工艺条件是水力停留时间5D、投菌量V曹

2、Ⅳ污水为1／4000、PH值7．5、温度25℃以及光照微好氧条件；固定化光合细菌脱氮除磷的最适宜运行条件是水力负荷为50．0M3／M2．D和滤塔填料层厚度为7．20M。在最适宜工艺条件下，光合细菌降解NH3-N和TP的效果最好，试验最后游离光合细菌NH3一N和TP的浓度值分别为17．9MG／L和2．98MG／L,其去除率分别为60．24％和56．71％，均达到我国城镇污水处理厂污染物排放标准(GBl8918．2002)中的二级放标准；固定化光合细菌NH3-N和TP的浓度值分别为3．62MG／L和0．85MG／L

3、，其去除率分别为90．9％和87．7％，均达到我国城镇污水处理厂污染物排放标准(GBl8918-2002)中的一级放标准。关键词：光合细菌脱氮除磷生活污水机理最适宜工艺条件StudyOnTheMechanismAndTheApplicationOfRemovalOfNitrogenAndPhosphorusOfPhotosynthetic-bacteriaMajor：EnvironmentSciencePostgraduate：CaoPanInstructorAdvisor：LongBingqingAbstra

4、ct：Firstly,thispaperdemonstratesthemechanismofphotosyntheticbacteriainthenitrogenandphosphorusremovalwiththeconventionalsludgeremovalrateofthecontrasttest，anddrawsaconclusionthatphotosyntheticbacteriaarenitrogenando玛amcmatterthroughaerobicanddecompositionoft

5、hedirectabsorptionofanti-nitfificationtonitrogenremoval．However,regardlessofaerobicoranaerobicconditions，thephotosyntheticbacteriaandphosphorusremovalisthroughdirectabsorptionoforganicmatterdecompositiontophosphorusremoval．Then，thispaperappliestotheexperimen

6、talstudyofphotosyntheticbacteria，photosyntheticbacteriawereinvesti—gatedbyfreeandimmobilizedphotosyntheticbacterianitrogenandphosphorusremovalofthemostsuitableconditionsandtreatmenteffect．Finally,throughtheexperimentshowsthatphotosyntheticbacteriafreenitroge

7、nandphosphorusremovalistheoptimumtechnologicalconditionsaresuitableconditionsarehydraulicretentiontimeandvolume5d，bacteriainoculationamount．about1／4000，．pHvalue7．5，temperature25"Candthelightmicro-aerobicconditions．Andphotosyntheticbacteriaimmobilizednitrogen

8、andphosphorusremovalisthemostsuitableoperatingconditionsandthehydraulicloadingof50．0／m3／m2．dandfiltertowerthicknessfor1IIpacking7．20m．Inthemostappropriatetechnologyconditions，photosy-nthetie’。ba