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.

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.

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.

scholarly journals Enhancing the hydrolysis of excess sludge using thermophilic Bacillus sp. Hnu under different oxygen supply conditions

2013 ◽  
Vol 78 (8) ◽  
pp. 1135-1147 ◽  
Author(s):  
Wei Zheng ◽  
Ming Li ◽  
Zheng Li ◽  
Ying Xu ◽  
Guo Ya
Keyword(s):  
Oxygen Supply ◽  
Suspended Solid ◽  
Hydrolysis Rate ◽  
Volatile Suspended Solid ◽  
Bacillus Sp ◽  
Control Test ◽  
Excess Sludge ◽  
Aerobic Conditions ◽  
Thermophilic Bacillus ◽  
Hydrolysis Of

A thermophilic Bacillus strain was isolated from excess sludge in the present study. The 16S rDNA analysis indicated that this strain was a Bacillus sp. and has not been reported previously (named Bacillus sp. Hnu). The aim of this paper was to investigate the enhanced efficiency of excess sludge hydrolysis by the addition of thermophilic Bacillus sp. Hnu under different oxygen supply conditions. The results indicated that higher temperature and more oxygen supply was advantageous to the volatile suspended solid removal ratio with the same effect to that of protease activity. The maximum volatile suspended solid removal ratio was achieved at 21.5 %, 42.5 %, and 54.4 % after 108 h digestion at pH 6.9 and 60?C and increased by 17.2 %, 38 %, and 45.4 % under anaerobic, microaerobic, and aerobic conditions compared with the control test, respectively. The hydrolysis rate constants for the anaerobic, microaerobic, and aerobic conditions were 3, 4.8, and 7 times (40?C) and 3.5, 9.8, and 11.8 times (50?C) and 2.7, 7.2, and 10.3 times (60?C). Hydrolysis performance indicated that the Bacillus sp. Hnu could accelerate the hydrolysis rate. The kinetic study showed that the hydrolysis of sludge with Bacillus sp. Hnu and the control test followed the first-order kinetics except at 60?C.

scholarly journals Effect of Rotten Butter Shock Load on Anaerobic Digestion of Chicken Manure

2021 ◽  
Vol 41 (4) ◽  
pp. 362
Author(s):  
Gaweł Sołowski ◽  
Izabela Konkol ◽  
Marwa Shalaby
Keyword(s):  
Hydrogen Sulfide ◽  
Anaerobic Digestion ◽  
Flow Rate ◽  
Suspended Solid ◽  
Oxygen Flow Rate ◽  
Chicken Manure ◽  
Shock Load ◽  
Volatile Suspended Solid ◽  
Popular Method ◽  
Volatile Organic

Anaerobic digestion is a popular method for improving fertilizing properties, but there is no report on the effect of shock load with butter on anaerobic digestion of chicken manure. Therefore, this study aimed to investigate the anaerobic digestion of chicken manure with butter addition. The volatile suspended solid (VSS) was set at 20g VSS/L with different butter additions from 0 to 60 g VSS/L and different oxygen flow rate (OFR) from 0 to 2.5 mL/h. The results showed that ammonia ranged from 0.072 g/L to 0.082 g/L, while the volatile acids ranged from 425 mg/L to 325 mg/L. The volatile organic acid was significantly influenced by a change in OFR compared to ammonia, while a correlation between hydrogen and hydrogen sulfide was observed. The results showed that the highest hydrogen and methane production was obtained at butter addition of 30 g VSS/L with OFR 1.4 mL/h with volumes of 78 mL and 25 L respectively. In addition, hydrogen sulfide emissions induced rapid growth with increase in butter concentration.

scholarly journals ANALYSIS OF BIOGAS COMPONENT PRODUCTION DURING ANAEROBIC DIGESTION OF SOUR CABBAGE IN MICROAERATION CONDITIONS UNDER DIFFERENT pH CONDITIONS

2021 ◽  
Author(s):  
Gaweł Sołowski
Keyword(s):  
Anaerobic Digestion ◽  
Hydrogen Production ◽  
Flow Rate ◽  
Suspended Solid ◽  
Oxygen Flow Rate ◽  
Oxygen Flow ◽  
Volatile Suspended Solid ◽  
Flow Rates ◽  
Ph Conditions ◽  
Oxygen Addition

In the article, were checked influences of microaeration, pH, and VSS (Volatile Suspended Solid) for sour cab-bage anaerobic digestion. Results fermentation of sour cabbage under the condition of small oxygen addition are presented in this research can be classified as dark fermentation or hydrogenotrophic anaerobic digestion. The investigations were carried out for two concentrations 5 g VSS /L and 10 g VSS /L of sour cabbage at pH 6.0. The oxygen flow rates (OFR) for 5 g VSS /L were in the range of 0.53 to 3.3 mL/h for obtaining 2% to 8% of oxygen. In cases of low pH and microaeration, ethylene production was observed at a level below 0.05% in biogas. The highest volume of hydrogen for 5 g VSS/L was obtained for flow rate 0.58 O2 mL/h, giving hydrogen concentration in biogas in the range of 0 to 20%. For VSS 5 g/L and oxygen flow rate 0.58 mL/h; 0.021 L of hydrogen is produced per gram of VSS. In this case, VSS 10 g/L and oxygen flow rate 1.4 mL/h at pH 6.0, 0.03 L of hydrogen is generated per gram. Microaeration from 0.58 mL/h to 0.87 mL/h was propitious for hydrogen production at 5 g VSS/L of sour cabbage and 1.4 mL/h for 10 g/L. Another relevant factor is the volatile suspended solid factor of sour cabbage that caused optimal hydrogen production at VSS 89.32%.

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