The role of sludge retention time in the hydrolysis and acidification of lipids, carbohydrates and proteins during digestion of primary sludge in CSTR systems

One of reasons of non-effective biological nutrient removal from wastewater is lack of readily biodegradable organic matter. This problem could be solved by application of sludge hydrolysis process. The conditions for hydrolysis of primary sludge could be created performing the recirculation of the primary sludge and ensuring the required sludge retention time. In the period of preliminary investigation, the following conditions were created in the primary sedimen-tation tank of Vitebsk WWTP: average sludge recirculation was 4.8 % of the inlet flowrate to the sedimentation tank and average SRT was 5 days. Obtained results showed that hydrolysis process allowed improving the ratio between organic matter and nutrients in wastewater.

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Role of sludge retention time in mitigation of nitrous oxide emission from a pilot-scale oxidation ditch

Bioresource Technology ◽

10.1016/j.biortech.2019.121961 ◽

2019 ◽

Vol 292 ◽

pp. 121961 ◽

Cited By ~ 6

Author(s):

Nan Zhou ◽

Chenyuan Dang ◽

Zhirong Zhao ◽

Shishi He ◽

Maosheng Zheng ◽

...

Keyword(s):

Nitrous Oxide ◽

Retention Time ◽

Pilot Scale ◽

Nitrous Oxide Emission ◽

Oxidation Ditch ◽

Sludge Retention Time

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Anaerobic stabilisation and conversion of biopolymers in primary sludge—effect of temperature and sludge retention time

Water Research ◽

10.1016/j.watres.2003.10.016 ◽

2004 ◽

Vol 38 (4) ◽

pp. 983-991 ◽

Cited By ~ 68

Author(s):

Nidal Mahmoud ◽

Grietje Zeeman ◽

Huub Gijzen ◽

Gatze Lettinga

Keyword(s):

Retention Time ◽

Effect Of Temperature ◽

Primary Sludge ◽

Sludge Retention Time

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Impact of sludge retention time on MBR fouling: role of extracellular polymeric substances determined through membrane autopsy

Biofouling ◽

10.1080/08927014.2017.1333112 ◽

2017 ◽

Vol 33 (7) ◽

pp. 556-566 ◽

Cited By ~ 6

Author(s):

Ana F. Silva ◽

Silvia Antunes ◽

Filomena Freitas ◽

Gilda Carvalho ◽

Maria A. M. Reis ◽

...

Keyword(s):

Retention Time ◽

Extracellular Polymeric Substances ◽

Sludge Retention Time

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Research on Developing Carbon Resource with Primary Sludge by Two-Stage Complete Mixing Ferment Process

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.236-238.381 ◽

2011 ◽

Vol 236-238 ◽

pp. 381-384

Author(s):

Bai Hang Zhao ◽

Jun Li ◽

Jian Ren

Keyword(s):

Carbon Source ◽

Retention Time ◽

Methanogenic Bacteria ◽

Two Stage ◽

Primary Sludge ◽

Separation Effect ◽

Sludge Retention Time ◽

Carbon Resource

Two-stage complete mixing ferment process was used for developing carbon source with primary sludge. The effects of hydrolysis retention time (HRT) and sludge retention time (SRT) on the ferment system were studied. The results showed that the effective HRT was between 32 h and 36 h, and the effective SRT was between 4 d and 7 d. Under above conditions, the average effluent SCOD was in the range of 980 mg/L and 1180 mg/L, and supernatant MLSS was in the range of 50 mg/L and 80 mg/L. And then, the separation effect of the sludge thickener was clearly. Acidogenic bacteria and methanogenic bacteria could be separated effectively in the conditions.

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