Effect of seed sludge on characteristics and microbial community of
aerobic granular sludge |
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Authors: | Zhiwei Song Yuejun Pan Kun Zhang Nanqi Ren and Aijie Wang |
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Institution: | 1. School of Resource and Environmental Engineering,Heilongjiang Institute of Science and Technology,Harbin 150027,China 2. School of Municipal and Environmental Engineering,Harbin Institute of Technology,Harbin 150001,China |
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Abstract: | Aerobic granular sludge was cultivated by using di erent kinds of seed sludge in sequencing batch airlift reactor. The influence of
seed sludge on physical and chemical properties of granular sludge was studied; the microbial community structure was probed by using
scanning electron microscope and polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE). The results showed
that seed sludge played an important role on the formation of aerobic granules. Seed sludge taken from beer wastewater treatment
plant (inoculum A) was more suitable for cultivating aerobic granules than that of sludge from municipal wastewater treatment plant
(inoculum B). Cultivated with inoculum A, large amount of mature granules formed after 35 days operation, its SVI reached 32.75
mL/g, and SOUR of granular sludge was beyond 1.10 mg/(g min). By contrast, it needed 56 days obtaining mature granules using
inoculum B. DGGE profiles indicated that the dominant microbial species in mature granules were 18 and 11 OTU when inoculum A
and B were respectively employed as seed sludge. The sequencing results suggested that dominant species in mature granules cultivated
by inoculum A were Paracoccus sp., Devosia hwasunensi, Pseudoxanthomonas sp., while the dominant species were Lactococcus
ra nolactis and Pseudomonas sp. in granules developed from inoculum B. |
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Keywords: | aerobic granular sludge seed sludge microbial community PCR-DGGE |
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