ZHANG Li-nan,HUANG Si-nong,LAN Xin,et al.Dry Storage and Recovery of Autotrophic Nitrifying Granular Sludge[J].China Water & Wastewater,2021,37(5 5):1-9.
Dry Storage and Recovery of Autotrophic Nitrifying Granular Sludge
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
5 5
Page:
1-9
Column:
Date of publication:
2021-03-01
- Abstract:
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Autotrophic nitrifying granular sludge (ANGS) was embedded in agar and stored in a closed environment with low temperature, open environment with low temperature, closed environment with room temperature and open environment with room temperature, respectively. The effects of storage environment on the stability of ANGS were explored, and the recovery of the stored ANGS was investigated. After 40 days of storage, the shape of most ANGS was still compact and smooth, their mass were reduced by 32.5%, 31.3%, 47.5% and 39.2%, and the specific oxygen uptake rate (SOUR) decreased to 13.39 mgO2/(gMLVSS·h), 16.75 mgO2/(gMLVSS·h), 11.87 mgO2/(gMLVSS·h) and 14.64 mgO2/(gMLVSS·h), respectively. During the recovery period, breakage of some granules was observed, but no obvious disintegration occurred. The activity of ANGS returned to pre-storage levels ［18.6-28.9 mgO2/(gMLVSS·h)］ on day 22.
remained below 1 after 34 days of recovery, indicating that the activity of nitrite oxidizing bacteria (NOB) was higher than that of ammonia oxidizing bacteria (AOB). The removal efficiency of ammonia nitrogen reached about 80% after 50 days of recovery. However, the removal efficiency of total inorganic nitrogen was less than 5% due to lack of available carbon resources. The dominant genera, such as Nitrosomonas (17.27%) and Comamonas (15.2%), disappeared after storage, while Methylobacillus (40.92%) and Hyphomicrobium (11.62%) became the dominant genera after recovery.
Last Update:
2021-03-01