氮源对气相生物滴滤床净化效果的影响_刘强

氮源对气相生物滴滤床净化效果的影响刘　强　汪凤诞　马广大　王艳芳(西安建筑科技大学,西安710055)摘　要　氮源对于气相生物滴滤床的净化效果有显著的影响。由于喷淋液体在生物滴滤床中分布不均匀,导致床层中局部氮源不充足,从而使滤床的去除效果降低。提高喷淋液中氮源的浓度,可以较大幅度提高净化效率。采用NH-4-N会导致滤床中硝化细菌的生长和累积,使得异养菌和硝化细菌在溶解氧、氮源和填料空间上形成竞争,并致使氮源分布不均匀,而采用NO3-N作为氮源可以改善这种状况。关键词　气相生物滴滤床　氮源的浓度　氮源的种类　净化效果Thenitrogensource'seffectsontheperformanceofairphasetricklingbiofilterLiuQiang　WangFengdan　MaGuangda　WangYanfang(Xi'anUniversityofArchitecture&Technology,Xi'an710055)Abstract　Thenitrogensource'seffectsonthepurificationperformanceofairphasetricklingbiofilteraresignifi-cant.Becauseoftheunevendistributionofnutrientliquidinthefilter,thenitrogensourcesareinaccessibletobacteri-umatsomepartsofthesolidmediathatcausethedecreaseofpurificationefficiency.Increasingthemassdensityofni-trogensourcesinthenutrientliquidcanlargelyenhancetheperformanceoffilter.UsetheNH-4-Nasthesolenitrogennutrientsourceresultsinunevendistributionofnutrientsourceandthedevelopmentandaccumulationofnitrifyingbac-teria,whichwillcompetewithVOCdegradatorinthedissolve