Cause and pre-alarm control of bulking and foaming by Microthrix parvicella—A case study in triple oxidation ditch at a wastewater treatment plant

Xie, Bing; Dai, Xing-Chun; Ya-tong, XU

doi:10.1016/j.jhazmat.2006.09.006

Cited by 50 publications

(21 citation statements)

References 21 publications

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“…With a low maximum specific growth rate, high storage capacity, and low maintenance energy requirement, M. parvicella has a significant advantage over other microorganisms prevailing in the extended aeration activated sludge systems, especially under low temperature conditions. Previous studies show that M. parvicella are more hydrophobic than most other activated sludge bacteria [22], which may allow them to easily access the hydrophobic substrates such as lipids for growth at low temperature [23]. The whole sludge bulking continued for almost 5 months.…”

Section: Resultsmentioning

confidence: 99%

Sludge bulking impact on relevant bacterial populations in a full-scale municipal wastewater treatment plant

Wang

et al. 2014

Process Biochemistry

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a b s t r a c tWe have investigated the changes of microbial community structures and the concomitant performance in two biological wastewater treatment systems (conventional and inverted A 2 /O processes) over a whole cycle of sludge bulking. A low level of filament abundance was observed during non-bulking period, with types 0092 and 0041 as the dominant filamentous bacteria. With the increase of the sludge volume index values from 76 (73) to 275 (300) mg/L, the filament abundance estimated by microscopic examination increased from 1 (few) to 5 (abundant), with Microthrix parvicella becoming the dominant filament bacteria. Sludge bulking resulted in a significant shift in bacterial compositions from Proteobacteria to Actinobacteria dominance, characterized by the significant presence of filamentous M. parvicella (from not detected to higher than 60% of clones) and decrease of the dominant Betaproteobacterial population (from higher than 40% to less than 1%). Important relevant bacterial populations including polyphosphateaccumulating organism (PAO, Candidatus Accumulibacter phosphatis), ammonia-oxidizing bacteria (AOB, Nitrosomonas), nitrite-oxidizing bacteria (NOB, Nitrospira) and denitrifying bacteria (Thauera) were absent under the serious bulking condition. Accumulation of nitrite and ammonia was observed during serious bulking, while the phosphorus removal performance was not decreased because M. parvicella could behave as a PAO.

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Section: Resultsmentioning

confidence: 99%

Sludge bulking impact on relevant bacterial populations in a full-scale municipal wastewater treatment plant

Wang

et al. 2014

Process Biochemistry

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“…Many studies have demonstrated the necessity of fundamental DO levels for good ASP performance, since DO levels of\1 mg l -1 frequently cause bulking (Thompson and Forster, 2003;Xie et al 2007). It has been reported that operating at higher DO levels can control the proliferation and dominance of the filamentous bacterial species responsible for bulking, Candidatus 'Microthrix parvicella', as it is microaerophilic (Nielsen et al 2009).…”

Section: Resultsmentioning

confidence: 99%

Efficient COD removal and nitrification in an upflow microaerobic sludge blanket reactor for domestic wastewater

Zheng

Cui

2011

Biotechnol Lett

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The treatment performance of an upflow microaerobic sludge blanket reactor (UMSB) for synthetic domestic wastewater was investigated at two dissolved oxygen (DO) levels, 0.3-0.5 and 0.7-0.9 mg l(-1), focusing on nitrification performance. The higher DO level induced complete nitrification of ammonia nitrogen (NH(3)-N), achieving chemical oxygen demand and NH(3)-N removals of 97 and 92%, respectively. There were consistently significantly higher nitrate nitrogen (NO(3)-N) and nitrite nitrogen (NO(2)-N) levels in the effluent, with ~66% of newly-produced oxidised nitrogen as NO(2)-N. Despite the high nitrification efficiency, only about 23% of the removed NH(3)-N amount from the influent was ultimately transformed into oxidised nitrogen due to the simultaneous nitrification-denitrification. Sludge blanket development and granulation occurred simultaneously in the UMSB.

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“…In the north of China, the temperature is much discrepant in summer and winter, and the temperature changes sharply, when the season varies. Temperature drastically fluctuated result in negatively impact on the steady operation of the WWTPs, such as the removal rate of nitrogen and phosphorus was decreased, ammonia nitrogen nitrification was deteriorated, and sludge bulking or foaming was occurred in the WWTPs [11]. There are many researchers [12~14] investigated organic substance, nitrogen and phosphorus removal in relatively high temperature, while few researchers investigated the contaminations removal in low temperature, and the influence of varying temperature on the contaminations removal, and in simultaneous removal of nitrogen and phosphorus along with organics removal process, the microbial growth condition and characteristics of the related microorganisms are respectively different [15], so the temperature may have different affect on the contaminations removal.…”

Section: Introductionmentioning

confidence: 99%

Biological nitrogen and phosphorus removal using anoxic-anaerobic oxidation ditch under low temperature condition

Nengzi¹,

Hu²,

Wang³

et al. 2018

Proceedings of the 2018 7th International Conference on Energy, Environment and Sustainable Development (ICEESD 2018)

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Cause and pre-alarm control of bulking and foaming by Microthrix parvicella—A case study in triple oxidation ditch at a wastewater treatment plant

Cited by 50 publications

References 21 publications

Sludge bulking impact on relevant bacterial populations in a full-scale municipal wastewater treatment plant

Sludge bulking impact on relevant bacterial populations in a full-scale municipal wastewater treatment plant

Efficient COD removal and nitrification in an upflow microaerobic sludge blanket reactor for domestic wastewater

Biological nitrogen and phosphorus removal using anoxic-anaerobic oxidation ditch under low temperature condition

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