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

2004 ◽  
Vol 38 (4) ◽  
pp. 983-991 ◽  
Author(s):  
Nidal Mahmoud ◽  
Grietje Zeeman ◽  
Huub Gijzen ◽  
Gatze Lettinga
Keyword(s):  
Retention Time ◽  
Effect Of Temperature ◽  
Primary Sludge ◽  
Sludge Retention Time

Preliminary Investigation of Primary Sludge Hydrolysis

2017 ◽  
Author(s):  
Regimantas Dauknys ◽  
Aušra Mažeikienė ◽  
Anna Haluza ◽  
Illia Halauniou ◽  
Victor Yushchenko
Keyword(s):  
Organic Matter ◽  
Retention Time ◽  
Nutrient Removal ◽  
Preliminary Investigation ◽  
Biological Nutrient Removal ◽  
Primary Sludge ◽  
Sludge Retention Time ◽  
Hydrolysis Process ◽  
Sludge Hydrolysis ◽  
Hydrolysis Of

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.

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

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.

scholarly journals Sludge retention time impacts on polyhydroxyalkanoate productivity in uncoupled storage/growth processes

2021 ◽  
pp. 149363
Author(s):  
Mariana Matos ◽  
Rafaela A.P. Cruz ◽  
Pedro Cardoso ◽  
Fernando Silva ◽  
Elisabete B. Freitas ◽  
...  
Keyword(s):  
Retention Time ◽  
Growth Processes ◽  
Sludge Retention Time

Effect of 200 days' sludge retention time on performance of a pilot scale submerged membrane bioreactor for high strength industrial wastewater treatment

2006 ◽  
Vol 53 (11) ◽  
pp. 269-276 ◽  
Author(s):  
C.T. Hay ◽  
D.D. Sun ◽  
S.L. Khor ◽  
J.O. Leckie
Keyword(s):  
Retention Time ◽  
Industrial Wastewater ◽  
Membrane Bioreactor ◽  
Hydraulic Retention Time ◽  
High Strength ◽  
Pilot Scale ◽  
Submerged Membrane Bioreactor ◽  
Sludge Retention Time ◽  
Organic Removal ◽  
Sludge Concentration

A high strength industrial wastewater was treated using a pilot scale submerged membrane bioreactor (MBR) at a sludge retention time (SRT) of 200 d. The MBR was operated at a high sludge concentration of 20 g/L and a low F/M ratio of 0.11 during 300 d of operation. It was found that the MBR could achieve COD and TOC overall removal efficiencies at more than 99 and 98% TN removal. The turbidity of the permeate was consistently in the range of 0.123 to 0.136 NTU and colour254 absorbance readings varied from 0.0912 to 0.0962 a.u. cm−1. The sludge concentration was inversely proportional to the hydraulic retention time (HRT), yielded excellent organic removal and extremely low sludge production (0.0016 kgVSS/day).

Effects of sulfate concentration and sludge retention time on the interaction between methane production and sulfate reduction for butyrate

1994 ◽  
Vol 30 (8) ◽  
pp. 45-54 ◽  
Author(s):  
O. Mizuno ◽  
Y. Y. Li ◽  
T. Noike
Keyword(s):  
Sulfate Reduction ◽  
Retention Time ◽  
Methane Production ◽  
Electron Flow ◽  
Degradation Pathway ◽  
Sulfate Concentration ◽  
High Concentration ◽  
Total Electron ◽  
Sludge Retention Time ◽  
Wide Range

The effects of sulfate concentration and COD/S ratio on the anaerobic degradation of butyrate were investigated by using 2.0 L anaerobic chemostat-type reactor at 35°C. The study was conducted over a wide range of the COD/S ratio (1.5 to 148) by varying COD concentrations (2500–10000 mg/L) and sulfate concentrations (68–1667 mg-S/L) in the substrate. The sludge retention time at each COD/S ratio was changed from 5 to 20 days. The interaction between methane producing bacteria (MPB) and sulfate-reducing bacteria (SRB) was evidently influenced by COD/S ratio in the substrate. When COD/S ratio was 6.0 or more, methane production was the predominate reaction and over 80% of the total electron flow was used by MPB. At the COD/S ratio of 1.5, SRB utilzed over 50% of the total electron flow. A large amount of sulfate reduction resulted in not only the decrease of methane production, but also the rapid increase of the bacterial growth. The degradation pathway of butyrate and the composition of bacterial populations in the reactor were also dominated by COD/S ratio. In sulfate depleted condition, butyrate was degraded to methane via acetate and hydrogen by MPB. On the other hand, butyrate was firstly degraded into sulfide and acetate in sulfate rich conditions by SRB, and the produced acetate was then degraded by acetate consuming MPB and SRB. The methanogenesis from acetate was inhibited by the high concentration of sulfide.

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