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高效降解苯胺好氧颗粒污泥的形成及动力学研究

发表时间:2009-12-31  浏览量:2026  下载量:892
全部作者: 朱亮,徐向阳,田志娟,罗伟国
作者单位: 浙江大学环境与资源学院;浙江省天正设计工程有限公司
摘 要: 实验以苯胺(aniline,AN)为唯一碳源与能源,以普通城市污水处理厂曝气池活性污泥为接种物,通过表面气速、污泥沉降时间、进水AN负荷等工艺参数的联合调控创造合适的选择压,序批式气提生物反应器(sequencing airlift bioreactor,SABR)连续运行2个月,SABR内污泥颗粒化明显,进水AN负荷1.2 kg·m-3·d-1条件下AN的化学需氧量(chemical oxygen demand, COD)和去除率分别稳定在99%和95%以上;获得成熟好氧颗粒结构致密,平均粒径为(1.22±0.17)mm,最小沉降速度为(35.0±1.8)m·h-1,污泥体积指数(sludge volume index, SVI)为(45.5±2.5)mL·g-1,比耗氧速率(specific oxygen uptake rate, SOUR)为91.5 mgDO·gVSS-1·h-1,苯胺比降解速率达(0.41±0.08)g·gVSS-1·d-1;颗粒内外分布有丰富的类球菌、类短杆菌,与胞外多聚物(extracellular polymeric substances, EPS)交织共存;好氧颗粒降解苯胺动力学与Haldane方程拟合良好,Vmax为(1.40±0.42) g·gVSS-1·d-1,Ks为(124.87±34.69) mg·L-1,Ki为(1 428.5±53.1) mg·L-1.
关 键 词: 环境微生物学;好氧颗粒污泥;苯胺;序批式气提生物反应器;动力学
Title: Formation and degradation kinetics of aerobic aniline-degrading granular sludge
Author: ZHU Liang, XU Xiangyang, TIAN Zhijuan, LUO Weiguo
Organization: College of Environmental and Resource Sciences, Zhejiang University;Zhejiang Titan Design & Engineering Co., Ltd.
Abstract: This study demonstrates that aerobically grown microbial granules fed with aniline (AN) as the sole carbon source and energy can be developed to achieve high aniline loading rate in a sequencing airlift bioreactor (SABR). The SABR was started with fresh activated sludge as inoculum. During the granulation stage, the surficial gas velocity, settling time and the influent loading were contronled. The aerobic granules were first appeared on day 47 after startup. The aniline loading rate was then adjusted stepwise to a final value of 1.2 kg·-3·d-1. At this high loading rate, the chemical oxygen demand(COD) and removal rate of the AN were respectively above 99% and 95%. The mature aerobic granules had compact structure, mean size of (1.22±0.17) mm, minimal settling velocity of (35.0±1.8) m·h-1, sludge volume index (SVI) of (45.5±2.5) mL·g-1, specific oxygen uptake rate (SOUR) of 91.5 mgDO·gVSS-1·h-1 and specific aniline degradation rate of (0.41±0.08) g·gVSS-1·d-1. The microbial granules consisted of bacterial rods and cocci embedded in an extracellular polymeric substances (EPS). Degradation kinetics for all tests were well described by the typical substrate inhibition pattern as predicted by the Haldane equation, and the corresponding kinetic coefficients of Vmax, Ks and Ki were (1.40±0.42) g·gVSS-1·d-1, (124.87±34.69) mg·L-1 and (1 428.5±53.1) mg·L-1, respectively.
Key words: environmental microbiology; aerobic granule; aniline; sequential airlift bioreactor; kinetics
发表期数: 2009年12月第24期
引用格式: 朱亮,徐向阳,田志娟,等. 高效降解苯胺好氧颗粒污泥的形成及动力学研究[J]. 中国科技论文在线精品论文,2009,2(24):2605-2612.
 
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