Sewage Sludge Thermal Hydrolysis Process

2013 ◽  
Vol 827 ◽  
pp. 368-373
Author(s):  
Guang Li ◽  
He Ren ◽  
Jing Li ◽  
Xiang Kui Han ◽  
Lian Peng Wang
Keyword(s):  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Organic Acids ◽  
Temperature Rise ◽  
Suspended Solids ◽  
Concentration Change ◽  
Thermal Hydrolysis ◽  
Excess Sludge ◽  
Hydrolysis Process ◽  
Hydrolysis Temperature

In 110~190°C for 15~75min excess sludge thermal hydrolysis test, investigated the dissolution rate of the volatile suspended solids, Sludge SCOD, TCOD concentration change in composition of organic acids in the supernatant, and analysis the improvement of the anaerobic digestion performance. The results show that, with the increase of thermal hydrolysis temperature and extension of time, sludge supernatant on SCOD, VFA rising. At 190 °C, 75min conditions, SCOD, VFA reached the maximum 6674mg / L2630mg/ L; Sludge organic solids dissolved and the release of COD, etc. mainly in the first 45 min to complete, little change after 45min. When thermal hydrolysis temperature between 90~170°C, anaerobic digestion performance increase with temperature rise, When the temperature is higher than 170 °C, the sludge anaerobic digestion performance begins to decline.

Combination of High Pressure and Thermal Hydrolysis Pretreatment Effect on Sludge

2013 ◽  
Vol 838-841 ◽  
pp. 18-22
Author(s):  
Guang Li ◽  
Xiao Xia Jiao ◽  
Jing Li ◽  
Xiang Kui Han ◽  
Lian Peng Wang
Keyword(s):  
High Pressure ◽  
Anaerobic Digestion ◽  
Organic Acids ◽  
Suspended Solid ◽  
Volatile Suspended Solid ◽  
Thermal Hydrolysis ◽  
Supernatant Fluid ◽  
Excess Sludge ◽  
Characteristics Analysis ◽  
Hydrolysis Temperature

In 110-190°C for 15-75 min of excess sludge thermal hydrolysis experiment, inspected the volatile suspended solid dissolution rate, the concentration of sludge SCOD, TCOD, components of organic acids in the supernatant fluid changes,such as sewage thermal hydrolysis characteristics, analysis the effect to improve the performance of sludge anaerobic digestion. The results show that with the increase of thermal hydrolysis temperature and time, SCOD and VFA in the sludge supernatant on rising. Under the condition of 190°C,75min, SCOD and VFA reached a maximum of 6674 mg/L,2630 mg/L; Release of sludge organic dissolved solids,COD and other major completed in the first 45 min,after 45 min changed little; Thermal hydrolysis temperature was between 90~170°C,sludge anaerobic digestion performance increases with temperature,when the temperature was higher than 170°C,sludge anaerobic digestion performance began to decline.

Research on the stability of heavy metals (Cu, Zn) in excess sludge with the pretreatment of thermal hydrolysis

2015 ◽  
Vol 73 (4) ◽  
pp. 890-898 ◽  
Author(s):  
Huimin Wu ◽  
Meng Li ◽  
Lei Zhang ◽  
Chao Sheng
Keyword(s):  
Heavy Metals ◽  
Anaerobic Digestion ◽  
Chemical Speciation ◽  
Stable Form ◽  
Thermal Hydrolysis ◽  
Excess Sludge ◽  
The Stability ◽  
Cu And Zn

Thermal hydrolysis (TH) has been used to improve anaerobic digestion performance as well as the stability of heavy metals in sludge. Because the toxicity of heavy metals is closely related to both the concentration and the chemical speciation, more exhaustive studies on speciation distribution are urgently needed. This research aimed to investigate the effects of TH treatment (especially the time and temperature) on the concentration and stability of heavy metals in sludge, and to define the optimal TH conditions. The TH experiment indicated that the content of the stable form of Cu and Zn reached 83% and 47.4%, respectively, with TH at 210°C and 30 min. Compared with the raw sludge, the proportion of Cu and Zn increased by 11.88% and 7.3%, respectively. Results indicated that the heavy metals were combined with sludge in a more stable form with the pretreatment of TH, which improved the stability of heavy metals.

Minimisation of excess sludge production in a WWTP by coupling thermal hydrolysis and rapid anaerobic digestion

2005 ◽  
Vol 52 (10-11) ◽  
pp. 255-263 ◽  
Author(s):  
J. Chauzy ◽  
S. Graja ◽  
F. Gerardin ◽  
D. Crétenot ◽  
L. Patria ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Anaerobic Digestion ◽  
Pilot Plant ◽  
Hydraulic Retention Time ◽  
Wastewater Treatment Plants ◽  
Control Line ◽  
Thermal Hydrolysis ◽  
Excess Sludge ◽  
Anaerobic Digesters ◽  
Sludge Production

In many cases, reducing sludge production could be the solution for wastewater treatment plants (WWTP) that here difficulty evacuating the residuals of wastewater treatment. The aim of this study was to test the possibility of minimising the excess sludge production by coupling a thermal hydrolysis stage and an anaerobic digestion with a very short HRT. The tests were carried out on a 2,500 p.e. pilot plant installed on a recycling loop between the clarifier and the actived sludge basin. The line equipped with the full scale pilot plant produced 38% TSS less than the control line during a 10 week period. Moreover, the rapid anaerobic digestion removed, on average, more than 50% of the total COD load with a hydraulic retention time (HRT) of 3 days. Lastly, the dryness of the remaining excess sludge, sanitised by the thermal hydrolysis, was more than 35% with an industrial centrifuge. This combination of thermal hydrolysis and rapid anaerobic digestion equally permits a significant gain of compactness compared to traditional anaerobic digesters.

Microwave Thermal Hydrolysis Of Sewage Sludge As A Pretreatment Stage For Anaerobic Digestion

2008 ◽  
Author(s):  
W. Qiao ◽  
W. Wang ◽  
R. Xun ◽  
Kazuyuki Tohji ◽  
Noriyoshi Tsuchiya ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Thermal Hydrolysis ◽  
Hydrolysis Of

Partition and fate analysis of fluoroquinolones in sewage sludge during anaerobic digestion with thermal hydrolysis pretreatment

2017 ◽  
Vol 581-582 ◽  
pp. 715-721 ◽  
Author(s):  
Ning Li ◽  
Huajie Liu ◽  
Yonggang Xue ◽  
Hongyang Wang ◽  
Xiaohu Dai
Keyword(s):  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Thermal Hydrolysis

Retrofitting Thermal Hydrolysis Process into an Existing WRRF with Anaerobic Digestion and Combined Heat and Power: Benefits and Challenges

2015 ◽  
Vol 2015 (10) ◽  
pp. 5401-5415
Author(s):  
Stephanie Spalding ◽  
Perry Schafer ◽  
Charles B Bott ◽  
Katherine Linares ◽  
Jeffrey Layne
Keyword(s):  
Anaerobic Digestion ◽  
Combined Heat And Power ◽  
Thermal Hydrolysis ◽  
Hydrolysis Process

scholarly journals Effects of post anaerobic digestion thermal hydrolysis on dewaterability and moisture distribution in digestates

2019 ◽  
Vol 80 (7) ◽  
pp. 1338-1346 ◽  
Author(s):  
Oda K. Svennevik ◽  
Odd Egil Solheim ◽  
Greeley Beck ◽  
Geir H. Sørland ◽  
Kjell R. Jonassen ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Raw Materials ◽  
Free Water ◽  
Full Scale ◽  
Moisture Distribution ◽  
Thermal Hydrolysis ◽  
Water Fraction ◽  
Solids Concentration ◽  
Hydrolysis Process ◽  
The Impact

Abstract Organic waste fractions such as sewage sludge, food waste and manure can be stabilized by anaerobic digestion (AD) to produce renewable energy in the form of biogas. Following AD, the digested solid fraction (digestate) is usually dewatered to reduce the volume before transportation. Post-AD treatments such as the Post-AD thermal hydrolysis process (Post-AD THP) have been developed to improve the dewatering, but the mode of action is not well understood. In this study, samples from 32 commercial full-scale plants were used to assess the impact of Post-AD THP on a broad range of raw materials. Maximum dewatered cake solids after Post-AD THP was predicted by thermogravimetric analysis (TGA). Post-AD THP changed the moisture distribution of the samples by increasing the free water fraction. A consistent improvement in predicted dewatered cake solids was achieved across the 32 samples tested, on average increasing the dry solids concentration by 87%. A full-scale trial showed that dewatering Post-AD THP digestate at 80 °C improved dewatered cake solids above the predictions by TGA at 35 °C. In conclusion, dewatered cake solids were significantly improved by Post-AD THP, reducing the volume of dewatered cake for disposal.

Anaerobic digestion enhanced by thermal hydrolysis: First reference BIOTHELYS® at Saumur, France

2008 ◽  
Vol 3 (1) ◽  
Author(s):  
Julien Chauzy ◽  
Didier Cretenot ◽  
Anne Bausseron ◽  
Stéphane Deleris
Keyword(s):  
Anaerobic Digestion ◽  
Nutrient Removal ◽  
Steam Injection ◽  
Green Energy ◽  
Biological Nutrient Removal ◽  
Thermal Hydrolysis ◽  
Industrial Sludge ◽  
Biological Sludge ◽  
Hydrolysis Process ◽  
Hydrolysis Of

Veolia Water has developed during these last years its own THP (Thermal Hydrolysis Process) named BIOTHELYS® in order to enhance MAD (mesophilic anaerobic digestion) of municipal or industrial sludge. The first reference BIOTHELYS® has been installed at Saumur in France, an extended aeration biological nutrient removal facility, and commissioned in April 2006. The thermal hydrolysis of dewatered sludge is realised by steam injection at a temperature of 160°C for duration of circa 30 minutes. The THP reactors are paired in order to recover flash steam and heat sludge economically. The MAD of hydrolysed sludge is done within a HRT of 15 days and reaches volatile reduction of more than 45% on extended aeration biological sludge. BIOTHELYS® turns the MAD of extended aeration biological sludge into a very attractive solution while producing green energy with biogas. MAD is thus no more only reserved for mixed sludge but also for pure biological sludge when using THP.

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