李志华 Likes:

Affiliation of Author(s):

环境与市政工程学院

Journal:

Environmental Technology

Key Words:

中文关键字：好氧颗粒污泥,好样颗粒，英文关键字：Aerobic granular sludge, aerobic granule, extracel

Abstract:

with airflow rates of 4 (R1) and 6 (R2) l min-1, respectively, were used to develop aerobic granules. Granules were well developed with excellent settleability in terms of SVI30 (sludge volume index,) of about 50 ml g-1 in both reactors at the beginning. With the outgrowth of rotifers, granules completely disintegrated in R1 around cycle 500 (a cycle was 3 hours). However, after the rotifers disappeared, i.e. cycle 550, granules re-appeared with a slow settling rate in R1 (SVI30: 200-300 ml g-1). The rotifers mechanically damaged the structure of granules, resulting in disintegration. However, granules developed under high shear force seem to have strong resistance to rotifers. During re-granulation, a long time lag between the improvements of morphology and settleability suggested that re-granulation resulted from entanglement more than bioattachment or bio-growth. Additionally, it was confirmed that the ratio of carbohydrate to protein extracellular polymeric substances (EPS) could well indicate the strength of granules. Protein EPS well correlated with the difference between SVI5 and SVI30 in R1, therefore, decreasing protein EPS would increase the compactness of granules.

Note:

王晓昌

First Author:

王晓昌,lizhihua

Indexed by:

Journal paper

Volume:

卷：28

Issue:

期：

Page Number:

页：235-242

Translation or Not:

no

Date of Publication:

2008-11-01