scholarly journals Effect of organic loading rate on the biological performance of the thermophilic anaerobic membrane bioreactor treating pulp and paper primary sludge

2021 ◽  
Author(s):  
A. Bokhary ◽  
M. Leitch ◽  
B. Q. Liao
Keyword(s):  
Membrane Bioreactor ◽  
Loading Rate ◽  
Pulp And Paper ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Primary Sludge ◽  
Anaerobic Membrane Bioreactor ◽  
Biological Performance

scholarly journals Effect of Organic Loading Rate on the Biological Performance of the Thermophilic Anaerobic Membrane Bioreactor Treating Pulp and Paper Primary Sludge

2021 ◽  
Author(s):  
Alnour Bokhary ◽  
Mathew Leitch ◽  
Baoqiang Liao
Keyword(s):  
Membrane Bioreactor ◽  
Loading Rate ◽  
Value Added ◽  
Pulp And Paper ◽  
Operating Conditions ◽  
Waste To Energy ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Primary Sludge ◽  
Anaerobic Membrane Bioreactor

Abstract Waste-to-energy or value-added products have been increasingly considered in many pulp and paper mills (PPMs) worldwide. However, developing appropriate conversion technologies is a major challenge in transforming PPMs wastes into biofuels or value-added biomaterials. In the present study, a long-term (320 d) anaerobic digestion of primary sludge of a thermomechanical pulp mill (TMP) was carried out for the first time in a thermophilic anaerobic membrane bioreactor (ThAnMBR). Effect of organic loading rate (OLR) in the range of 2.5–6.8 kg-COD/m3 d and hydraulic retention times (HRT) of 3–8 d on the process performance was investigated. Under various OLRs, stable biogas productions were obtained, and the best results were achieved with lower OLR (2.5 kg-COD/m3 d) and higher HRT (8 d), at biogas yields of 189 L biogas/kg MLSS fed. However, it was found that biogas production and sludge biomass degradation decrease when the organic loading rate increases. The proportion of sludge reduction ranged from 28.9 to 46.7% depending on the applied OLRs. Despite varying OLRs, stable membrane performance was obtained, where the required membrane flux was easily maintained during the reactor operation. In this study, also the properties of digestate and membrane permeates were studied under different operating conditions, and they fluctuated to some extent with OLR. ThAnMBR is a promising new technology for pulp and paper mill primary sludge treatment.

Fouling in a novel airlift oxidation ditch membrane bioreactor (AOXMBR) at different high organic loading rate

2013 ◽  
Vol 105 ◽  
pp. 69-78 ◽  
Author(s):  
Farshid Pajoum Shariati ◽  
Mohammad Reza Mehrnia ◽  
Mohammad Hossein Sarrafzadeh ◽  
Sara Rezaee ◽  
Alain Grasmick ◽  
...  
Keyword(s):  
Membrane Bioreactor ◽  
Loading Rate ◽  
Organic Loading Rate ◽  
Oxidation Ditch ◽  
Organic Loading ◽  
Airlift Oxidation Ditch

scholarly journals An Ana-Ano-MBR system for nutrient removal from brewery wastewater at various nitrate recirculation ratios

2019 ◽  
Vol 2 (2) ◽  
pp. 5-11
Author(s):  
Thien Nu Thai Van ◽  
Hung Viet Dang ◽  
Hoa Thi Thanh Nguyen
Keyword(s):  
Nutrient Removal ◽  
Phosphorus Removal ◽  
Membrane Bioreactor ◽  
Loading Rate ◽  
National Standards ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Brewery Wastewater ◽  
Operational Conditions ◽  
Low Phosphorus

Anaerobic and anoxic variations were combined with membrane bioreactor to form an Anaerobic/Anoxic configuration in MBR-based (Ana-Ano-MBR) system for improving the system performance in terms of organic degradation and nutrient removal from brewery wastewater. The model of Ana-Ano-MBR system made from polyacrylic with the capacity of 42 liters was operated with organic loading rate of 0.75 kgCOD/m3.day. The results showed that for the nitrate recycling ratios of 100, 200, 300%, average NH4+-N and TN removal efficiencies of the model were 95.1 and 76.6, 98.5 and 89.6, 98.9 and 90.2%, respectively, and the output values of NH4+-N and TN were within the limits of Vietnam National Standards (QCVN 40:2011/BTNMT, column A). Treatment efficiencies of COD and TP were over 90% and below 60%, respectively, during the whole experiment period. Low phosphorus removal efficiency was the drawback of Ana-Ano-MBR system due to the lack of appropriate system configuration and operational conditions for PAOs’ growth and activity.

Impact of Organic Loading Rate and DO on Filamentous Bulking Sludge and the Study of its Characteristics in Membrane Bioreactor

2010 ◽  
Vol 113-116 ◽  
pp. 1280-1284 ◽  
Author(s):  
Yu Tian ◽  
Xin Ying Su ◽  
Lin Chen ◽  
Tian Ling Jiang
Keyword(s):  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Loading Rate ◽  
Organic Loading Rate ◽  
Filamentous Bacteria ◽  
Organic Loading ◽  
High Substrate Concentration ◽  
Filamentous Bulking ◽  
And Control ◽  
The Impact

The membrane fouling behaviors and fouling mechanism of filamentous bulking sludge in membrane bioreactor (MBR) have been reported in recent studies. However, few studies have been conducted towards the causes and control of filamentous bulking sludge in MBR. In order to make clear the conditions of filamentous bacteria overgrowth in MBR, the impact of DO and organic loading rate on filamentous growth and its characteristics were investigated in this paper. The results showed that overgrowth of filamentous bacteria occurred under a relatively high substrate concentration (organic loading rate was 0.61 KgCOD/(KgMLSS•d), and DO was above 2 mg/L) in MBR. Nutrient removal effect can not be deteriorated under filamentous bulking sludge, with average 95, 57 and 92% removal efficiencies of COD, TN and TP respectively. The particle size of filamentous sludge was larger than that of normal sludge and the filamentous bacteria produced more SMP and EPS than floc forming bacteria.

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