Effect of thermal pretreatment on the biogas production and microbial communities balance during anaerobic digestion of urban and industrial waste activated sludge

2016 ◽  
Vol 214 ◽  
pp. 184-191 ◽  
Author(s):  
Hajer Ennouri ◽  
Baligh Miladi ◽  
Soraya Zahedi Diaz ◽  
Luis Alberto Fernández Güelfo ◽  
Rosario Solera ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Microbial Communities ◽  
Industrial Waste ◽  
Biogas Production ◽  
Waste Activated Sludge ◽  
Thermal Pretreatment

scholarly journals Comparison of the impacts of thermal pretreatment on waste activated sludge using aerobic and anaerobic digestion

2018 ◽  
Vol 78 (8) ◽  
pp. 1772-1781 ◽  
Author(s):  
Hyungjun (Brian) Jo ◽  
Wayne Parker ◽  
Peiman Kianmehr
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Oxygen Demand ◽  
Waste Activated Sludge ◽  
Thermal Pretreatment ◽  
Decay Products ◽  
Anaerobic Biodegradability ◽  
Pretreatment Conditions ◽  
The Impact ◽  
Aerobic And Anaerobic

Abstract A range of thermal pretreatment conditions were used to evaluate the impact of high pressure thermal hydrolysis on the biodegradability of waste activated sludge (WAS) under aerobic and anaerobic conditions. It was found that pretreatment did not increase the overall extent to which WAS could be aerobically biodegraded. Thermal pretreatment transformed the biodegradable fraction of WAS (XH) to readily biodegradable chemical oxygen demand (COD) (SB) (16.5–34.6%) and slowly biodegradable COD (XB) (45.8–63.6%). The impact of pretreatment temperature and duration on WAS COD fractionation did not follow a consistent pattern as changes in COD solubilization did not correspond to the observed generation of SB through pretreatment. The pretreated WAS (PWAS) COD fractionations determined from aerobic respirometry were employed in anaerobic modeling and it was concluded that the aerobic and anaerobic biodegradability of PWAS differed. It was found that thermal pretreatment resulted in as much as 50% of the endogenous decay products becoming biodegradable in anaerobic digestion. Overall, it was concluded that the COD fractionation that was developed based upon the aerobic respirometry was valid. However, it was necessary to implement a first-order decay process that reflected changes in the anaerobic biodegradability of the endogenous products through pretreatment.

Effects of mixed alkali-thermal pretreatment on anaerobic digestion performance of waste activated sludge

2020 ◽  
Vol 259 ◽  
pp. 120940 ◽  
Author(s):  
Xuemei Zou ◽  
Ruijie Yang ◽  
Xu Zhou ◽  
Gang Cao ◽  
Rongshu Zhu ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Waste Activated Sludge ◽  
Thermal Pretreatment ◽  
Mixed Alkali

scholarly journals EFFECT OF THERMAL PRETREATMENT ON THE SOLUBILIZATION OF ORGANIC MATTERS IN A MIXTURE OF PRIMARY AND WASTE ACTIVATED SLUDGE

2015 ◽  
Vol 9 (1) ◽  
pp. 82-88 ◽  
Author(s):  
Ahmed M. Aboulfotoh ◽  
E.H. El Gohary and O.D. El Monayeri
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Treatment Time ◽  
Chemical Properties ◽  
High Energy ◽  
Gas Production ◽  
Waste Activated Sludge ◽  
Thermal Pretreatment ◽  
Treatment Methods ◽  
Pre Treatment

The increased demand for advanced techniques in anaerobic digestion over the last few years has led to the employment of various pre-treatment methods prior to anaerobic digestion to increase gas production. These pre-treatment methods alter the physical and chemical properties of sludge in order to make it more readily degradable by anaerobic digestion. Although the thermal pre-treatment presents high energy consumption, the main part of this energy to heat can be recovered from the biogas produced in the anaerobic process. In this research a mixture of primary and waste activated sludge was thermally pretreated at 100, 125, 150, 175 and 200o C in order to determine the effect of thermal pretreatment on improving the solubilization of sludge by increasing the soluble organic fraction (expressed as soluble COD and VFA). Experimental results proved that the solubilization ratio of sludge is depends on the treatment time and the applied temperature and the optimal temperature ranged between 175 and 200o C. The COD solubilization ratio (at 175o C) increased from 11.2% to 15.1% and 25.1% when the time of treatment increased from 60 min to 120 and 240 min respectively. The experimental data could be fitted to obtain an empirical model (Known as the enzyme-kinetic equation) relating the COD solubilization ratio of sludge and VFA concentration to the applied temperature and the heating time.

scholarly journals EFFECT OF THERMAL PRETREATMENT ON THE SOLUBILIZATION OF ORGANIC MATTERS IN A MIXTURE OF PRIMARY AND WASTE ACTIVATED SLUDGE

2015 ◽  
Vol 9 (1) ◽  
pp. 82-88 ◽  
Author(s):  
Ahmed M. Aboulfotoh ◽  
E.H. El Gohary and O.D. El Monayeri
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Treatment Time ◽  
Chemical Properties ◽  
High Energy ◽  
Gas Production ◽  
Waste Activated Sludge ◽  
Thermal Pretreatment ◽  
Treatment Methods ◽  
Pre Treatment

The increased demand for advanced techniques in anaerobic digestion over the last few years has led to the employment of various pre-treatment methods prior to anaerobic digestion to increase gas production. These pre-treatment methods alter the physical and chemical properties of sludge in order to make it more readily degradable by anaerobic digestion. Although the thermal pre-treatment presents high energy consumption, the main part of this energy to heat can be recovered from the biogas produced in the anaerobic process. In this research a mixture of primary and waste activated sludge was thermally pretreated at 100, 125, 150, 175 and 200o C in order to determine the effect of thermal pretreatment on improving the solubilization of sludge by increasing the soluble organic fraction (expressed as soluble COD and VFA). Experimental results proved that the solubilization ratio of sludge is depends on the treatment time and the applied temperature and the optimal temperature ranged between 175 and 200o C. The COD solubilization ratio (at 175o C) increased from 11.2% to 15.1% and 25.1% when the time of treatment increased from 60 min to 120 and 240 min respectively. The experimental data could be fitted to obtain an empirical model (Known as the enzyme-kinetic equation) relating the COD solubilization ratio of sludge and VFA concentration to the applied temperature and the heating time.

Methane-rich biogas production from waste-activated sludge with the addition of ferric chloride under a thermophilic anaerobic digestion system

RSC Advances ◽  
2015 ◽  
Vol 5 (48) ◽  
pp. 38538-38546 ◽  
Author(s):  
Bao Yu ◽  
Dongling Zhang ◽  
Aidang Shan ◽  
Ziyang Lou ◽  
Haiping Yuan ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Ferric Chloride ◽  
Biogas Production ◽  
Waste Activated Sludge ◽  
Thermophilic Anaerobic Digestion ◽  
System P ◽  
Favourable Environment

Three ferric salts, i.e. Fe(NO3)3, Fe2(SO4)3 and FeCl3 were introduced to test the potential effects on sludge thermophilic anaerobic digestion, and a favourable environment was created with the addition of FeCl3.

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