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Stability of aerobic granular sludge in a pilot scale sequencing batch reactor enhanced by granular particle size control.

Journal:
Chemosphere


Issue Date:
2019


Abstract(summary):

Aerobic granulation was successfully achieved in a pilot scale sequencing batch reactor within 40 days. Then, stability of different particle size granules was explored according to their activity and resistance to ultrasonic crushing. Different particle size granules (0.3-0.6=E2=80=AFmm, 0.6-1=E2=80=AFmm, 1-1.43=E2=80=AFmm, 1.43-2=E2=80=AFmm, 2-3=E2=80=AFmm and 3-4=E2=80=AFmm) were exposed under different ultrasonic power separately. It was found that the granules with 2-3=E2=80=AFmm always had the maximum granulation rates after ultrasonic crushing. Meanwhile, activity data showed that the 2-3=E2=80=AFmm granules had the lowest specific oxygen utilization rates, which indicated that they were easier to maintain stability as the increase of their particle sizes was the slowest. So, 500=E2=80=AFmL mixed liquid of the reactor were taken out and sieved to obtain the 2-3=E2=80=AFmm granules, which were subsequently returned to the reactor to increase their proportion. Through the manual regulation, the proportion of 2-3=E2=80=AFmm granules kept increasing which gradually became dominant in the reactor. Under the strategy of 86 days of operation, the aerobic granules were regular and compact, which had good removal effects of the real wastewater. The results indicated that the stability of the system could be greatly enhanced by the method, which provided a new strategy to maintain the granular stability. Copyright =C2=A9 2019 Elsevier Ltd. All rights reserved.


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