CAJ | 학술논문

高效性是厌氧氨氧化(anaerobic ammonium oxidation, anammox)生物脱氮工艺的优势,污泥颗粒化则是生物反应器高效性的重要原因.控制进水亚硝酸盐浓度为360 mg·L~(-1),回流比为0.5,经过230 d的连续运行,逐步将厌氧氨氧化膨胀颗粒污泥床(expanded-granular sludge bed, EGSB)反应器(1.1 L)的水力停留时间由6.9 h缩短至0.30 h,获得的容积基质氮去除速率为50.75 kg·m-3·d~(-1),是原有世界最高水平的2倍.在此工况下获得的高负荷厌氧氨氧化颗粒污泥的平均粒径为(2.51±0.91)mm,比污泥厌氧氨氧化活性为1.899 kg·(kg VSS)~(-1)·d~(-1),胞外多聚物(extracellular polymers, ECP)总含量达143.00 mg·(g VSS)~(-1).随着反应器容积基质氮去除速率的提高,反应器内厌氧氨氧化颗粒污泥胞外多聚物含量增加,其中蛋白质含量增加更快,蛋白质的"超量产生"致使颗粒污泥的PN/PS增大,易随水流失.
고효성시염양안양화(anaerobic ammonium oxidation, anammox)생물탈담공예적우세,오니과립화칙시생물반응기고효성적중요원인.공제진수아초산염농도위360 mg·L~(-1),회류비위0.5,경과230 d적련속운행,축보장염양안양화팽창과립오니상(expanded-granular sludge bed, EGSB)반응기(1.1 L)적수력정류시간유6.9 h축단지0.30 h,획득적용적기질담거제속솔위50.75 kg·m-3·d~(-1),시원유세계최고수평적2배.재차공황하획득적고부하염양안양화과립오니적평균립경위(2.51±0.91)mm,비오니염양안양화활성위1.899 kg·(kg VSS)~(-1)·d~(-1),포외다취물(extracellular polymers, ECP)총함량체143.00 mg·(g VSS)~(-1).수착반응기용적기질담거제속솔적제고,반응기내염양안양화과립오니포외다취물함량증가,기중단백질함량증가경쾌,단백질적"초양산생"치사과립오니적PN/PS증대,역수수류실.
High effectiveness is one of the most attractive advantages of the anaerobic ammonium oxidation (anammox) process for nitrogen removal from ammonium-rich wastewater.Granulation is considered to play a vital role in development of high-load bioreactors.The hydraulic retention time (HRT) of the 1.1 L anammox EGSB (expanded-granular sludge bed) reactor was progressively shortened from 6.9 h to 0.30 h; while the influent nitrite concentration was fixed at 360 mg·L~(-1) and the effluent recycling was maintained at 0.5 constantly.A super high nitrogen removal rate, 50.75 kg·m-3·d~(-1) was recorded, which was 2 times of the highest value reported before.Granulation of the anammox microorganisms occurred in the high-load anammox EGSB reactor.The average diameter of the high-load anammox granules was (2.51±0.91)mm and the specific anammox activity reached 1.899 kg·(g VSS)~(-1)·d~(-1).The extracellular polymers (ECP) content was 143.00 mg·(g VSS)~(-1), which was amazingly high when compared to heterotrophic microbial granules.The extracellular proteins increased at a higher rate along with the increase of hydrodynamic shear stress, resulting in over-production of extracellular proteins.Thus the stability of the anammox granules decreased and sludge washout became inevitable.