化工进展2018，Vol.37Issue(4)：1623-1630,8.DOI:10.16085/j.issn.1000-6613.2017-1517
曝气深度对好氧颗粒污泥稳定性的影响
Influence of aeration depth on the stability of aerobic granular sludge
摘要
Abstract
Principle of shallow aeration was applied to aerobic granular sludge(AGS) technology in a sequencing batch airlift reactor(SBAR),and its feasibility was explored. Location of aerator under water surface was gradually decreased(130—30cm). It was found that aeration depth had an important influence on the flow field of the SBAR,which characterized by increase of aeration rate(400—500L/h)and decrease of dissolved oxygen(DO,8.00—5.88mg/L)and circulation velocity (27.25—11.39cm/s). Stability of AGS could be maintained when the aeration depth was more than 70cm. During these periods,sludge volume index(SVI)was between 16.19mL/g and 43.13mL/g, extracellular polymeric substance(EPS)was between 181.65mg/gMLSS and 262.46mg/gMLSS, granulation rate was between 80% and 88% and specific oxygen uptake rate(SOUR)was between 42.42mgO2/(gMLVSS·h) and 49.54mgO2/(gMLVSS·h),and removal rates of COD,total inorganic nitrogen(TIN)and total phosphorus(TP)were over 87%,94% and 86% respectively. However, when the aeration depth was less than 50cm,the granulation rate and the EPS rapidly decreased to 46% and 111.65mg/gMLSS,and the removal rates of COD,TIN,and TP eventually reduced to 43%,70% and 47%. The reason included greatly decrease of hydraulic shear force and significantly increase of oxygen mass transfer resistance in the SBAR. Additionally,obvious disintegration of AGS was observed,which eventually led to instability of the system. Compared with bottom aeration of sequencing batch reactor(SBR),the flow field of SBAR based on the principle of inka aeration was more uniform,which had the potential to reduce aeration energy consumption of AGS reactor.关键词
好氧颗粒污泥/气提式序批反应器/曝气/流场/稳定性/传质Key words
aerobic granular sludge/sequencing batch airlift reactor(SBAR)/aeration/flow field/stability/mass transfer分类
资源环境引用本文复制引用
赵珏,程媛媛,宣鑫鹏,张立楠,郑洋洋,龙焙..曝气深度对好氧颗粒污泥稳定性的影响[J].化工进展,2018,37(4):1623-1630,8.基金项目
江西省教育厅科技项目(GJJ150627)及江西理工大学大学生创新创业训练计划项目(XZG-16-08-08). （GJJ150627）
