Generation and properties of aerobic granular sludge

被引:152
作者
Etterer, T [1 ]
Wilderer, PA [1 ]
机构
[1] Tech Univ Munich, Inst Water Qual Control & Waste Management, D-85748 Garching, Germany
关键词
granular sludge; aerobic SBR; density measurement; porosity; settling velocity;
D O I
10.2166/wst.2001.0114
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A sequencing batch reactor (SBR) was used to investigate the generation of different granules cultured under aerobic and alternating anaerobic/aerobic conditions. The reactor was fed with synthetic wastewater. A substrate loading rate of 3.6 kg COD/ (m(3) day) was applied. Granules of heterotrophic microorganisms were formed. After the first experimental period of 8 weeks the average granule diameter was 3.2 mm. In the second period, alternating anaerobic/aerobic conditions were applied to form granular sludge with an average diameter of 3.0 mm. An isopycnic centrifugation procedure was used to determine the characteristic density of the aerobic granular sludge. The average density of the granular sludge was 1.044 g/ml and 1.048 g/ml, respectively. In free-settling tests the final settling velocity of single aggregates was examined to estimate porosity. Settling velocities up to 2.0 cm/s could be measured. Calculations based on the experimental results showed an average granula porosity of 72% for the first run and 65% average porosity for the second run. This paper indicates the validity of general assumptions in free-settling tests.
引用
收藏
页码:19 / 26
页数:8
相关论文
共 22 条
[1]  
[Anonymous], WATER POLLUT RES J C
[2]   Aerobic granulation in a sequencing batch reactor [J].
Beun, JJ ;
Hendriks, A ;
Van Loosdrecht, MCM ;
Morgenroth, E ;
Wilderer, PA ;
Heijnen, JJ .
WATER RESEARCH, 1999, 33 (10) :2283-2290
[3]   DENSITY OF ACTIVATED-SLUDGE SOLIDS [J].
DAMMEL, EE ;
SCHROEDER, ED .
WATER RESEARCH, 1991, 25 (07) :841-846
[4]   A RATIONAL APPROACH TO DRAG PREDICTION OF SPHERICAL AND NONSPHERICAL PARTICLES [J].
GANSER, GH .
POWDER TECHNOLOGY, 1993, 77 (02) :143-152
[5]   The density of particle aggregates [J].
Gregory, J .
WATER SCIENCE AND TECHNOLOGY, 1997, 36 (04) :1-13
[6]   POROSITY-SIZE RELATIONSHIP OF DRILLING MUD FLOCS - FRACTAL STRUCTURE [J].
HUANG, HN .
CLAYS AND CLAY MINERALS, 1993, 41 (03) :373-379
[7]   MEASUREMENT OF CHEMICAL SLUDGE FLOC DENSITY AND IMPLICATIONS RELATED TO SLUDGE DEWATERING [J].
KNOCKE, WR ;
DISHMAN, CM ;
MILLER, GF .
WATER ENVIRONMENT RESEARCH, 1993, 65 (06) :735-743
[8]  
LAGVANKAR AL, 1968, J AM WATER WORKS ASS, V60, P1040
[9]   PHYSICAL-CHEMICAL CHARACTERIZATION OF PERCOLL .2. SIZE AND INTERACTION OF COLLOIDAL PARTICLES [J].
LAURENT, TC ;
OGSTON, AG ;
PERTOFT, H ;
CARLSSON, B .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1980, 76 (01) :133-141
[10]   PHYSICAL-CHEMICAL CHARACTERIZATION OF PERCOLL .1. PARTICLE WEIGHT OF THE COLLOID [J].
LAURENT, TC ;
PERTOFT, H ;
NORDLI, O .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1980, 76 (01) :124-132