Thermal hydrolysis of waste activated sludge at Hengelo Wastewater Treatment Plant, The Netherlands

2014 ◽  
Vol 70 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Mathijs Oosterhuis ◽  
Davy Ringoot ◽  
Alexander Hendriks ◽  
Paul Roeleveld
Keyword(s):  
Activated Sludge ◽  
Treatment Plant ◽  
Waste Activated Sludge ◽  
Treatment Technique ◽  
Thermal Hydrolysis ◽  
Sludge Treatment ◽  
Water Board ◽  
Anaerobic Biodegradability ◽  
Hydrolysis Process ◽  
Hydrolysis Of

The thermal hydrolysis process (THP) is a sludge treatment technique which affects anaerobic biodegradability, viscosity and dewaterability of waste activated sludge (WAS). In 2011 a THP-pilot plant was operated, connected to laboratory-scale digesters, at the water board Regge en Dinkel and in cooperation with Cambi A.S. and MWH Global. Thermal hydrolysis of WAS resulted in a 62% greater volatile solids (VS) reduction compared to non-hydrolysed sludge. Furthermore, the pilot digesters could be operated at a 2.3 times higher solids loading rate compared to conventional sludge digesters. By application of thermal sludge hydrolysis, the overall efficiency of the sludge treatment process can be improved.

Influence on anaerobic digestion by intermediate thermal hydrolysis of waste activated sludge and co-digested wheat straw

2018 ◽  
Vol 72 ◽  
pp. 186-192 ◽  
Author(s):  
Michael Bjerg-Nielsen ◽  
Alastair James Ward ◽  
Henrik Bjarne Møller ◽  
Lars Ditlev Mørck Ottosen
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Wheat Straw ◽  
Waste Activated Sludge ◽  
Thermal Hydrolysis ◽  
Hydrolysis Of

Why applying THP on waste activated sludge makes sense: Psyttalia – Athens case study

2019 ◽  
Vol 14 (4) ◽  
pp. 921-930 ◽  
Author(s):  
D. Zikakis ◽  
J. Chauzy ◽  
I. Droubogianni ◽  
A. Georgakopoulos
Keyword(s):  
Activated Sludge ◽  
Energy Use ◽  
Substantial Reduction ◽  
Treatment Plant ◽  
Cost Savings ◽  
Waste Activated Sludge ◽  
Primary Sludge ◽  
Hydrolysis Process ◽  
Sludge Drying

Abstract In order to improve the energy footprint of Psyttalia wastewater treatment plant (WWTP) in Athens, the application of a thermal hydrolysis process (THP) was preferred to the option of constructing additional digesters. Since August 2015, approximately half of the generated waste activated sludge (WAS) has been treated by a Cambi B6-4 system, while the thickened primary sludge (PS) is by-passing the THP and is mixed with the hydrolysed WAS before entering the 4 digesters. The 4 other conventional digesters have treated the remaining sludge. The dewaterability of the mixed digested sludge has significantly been improved from 22% dry solids (DS) before THP installation, up to 31% DS after THP installation. This is providing substantial reduction of energy use and cost savings at the sludge drying plant of Psyttalia. In addition, biogas generation and digester efficiency (VSR) have been increased.

scholarly journals Thermal Hydrolysis of Sewage Sludge: A Case Study of a WWTP in Burgos, Spain

2021 ◽  
Vol 11 (3) ◽  
pp. 964
Author(s):  
José García-Cascallana ◽  
Xiomar Gómez Barrios ◽  
E. Judith Martinez
Keyword(s):  
Treatment Plant ◽  
Electricity Production ◽  
Thermal Hydrolysis ◽  
Mass Balances ◽  
Digested Sludge ◽  
Hydrolysis Process ◽  
Base Scenario ◽  
Mesophilic Digestion ◽  
Hydrolysis Of

An evaluation of the energy and economic performance of thermal hydrolysis technologies is carried out on a theoretical basis. The wastewater treatment plant (WWTP) of Burgos (Spain) was the base scenario of this evaluation. Energy and mass balances were established considering the registered data of primary and secondary thickened sludge in the WWTP for 2011 to 2016. These balances were analysed considering five different scenarios, taking as Scenario 1, the plant operating with conventional mesophilic digestion. The scenarios considered commercially available technologies. The best results were obtained when hydrolysis was applied to digested sludge and sludge from the Solidstream® process. These two scenarios showed the best performance regarding volatile solid removal and lower demand for live steam, achieving a higher amount of biogas available for valorisation using combined heat and power (CHP) units. The main advantage of the hydrolysis process is the decrease in the volume of digesters and the amount of dewatered sludge needing final disposal. The Solidstream® process allowed a 35% increase in biogas available for engines and a 23% increase in electricity production.

Effect of temperature on biogas yield increase and formation of refractory COD during thermal hydrolysis of waste activated sludge

2020 ◽  
Vol 171 ◽  
pp. 115383 ◽  
Author(s):  
Vahid Toutian ◽  
Matthias Barjenbruch ◽  
Tina Unger ◽  
Christian Loderer ◽  
Christian Remy
Keyword(s):  
Activated Sludge ◽  
Effect Of Temperature ◽  
Waste Activated Sludge ◽  
Thermal Hydrolysis ◽  
Biogas Yield ◽  
Yield Increase ◽  
Hydrolysis Of

Behaviour of Mechanically Blended Return-Sludge in Absence of Substrate

1970 ◽  
Vol 5 (1) ◽  
pp. 34-54
Author(s):  
Shyam D. Bokil ◽  
Jatinder K. Bewtra
Keyword(s):  
Activated Sludge ◽  
Suspended Solids ◽  
Treatment Plant ◽  
Aeration Rate ◽  
Batch Experiments ◽  
Sludge Treatment ◽  
Waring Blender ◽  
Settling Characteristics

Abstract Nine sets of batch experiments, each of ten to twelve days duration, were conducted in the laboratory on return-sludge samples collected from activated sludge treatment plant at Windsor. The thickened sludge samples were blended daily in a waring blender and were continuously aerated in twelve-litres capacity jars. Parallel runs were made on control sludge samples which were not blended. Amongst the parameters varied were the speed and frequency of blending and the aeration rate. The effects of these variables on progressive bio-degradation of volatile suspended solids and the settling characteristics of the sludge were determined. Blended sludge showed significant improvement in the rate of bio-degradation and its settling characteristics as compared to the control unblended sludge

Deemulsification of Water-in-Oil Emulsion with Sludges

1987 ◽  
Vol 22 (3) ◽  
pp. 437-443 ◽  
Author(s):  
N. Kosaric ◽  
Z. Duvnjak
Keyword(s):  
Activated Sludge ◽  
Room Temperature ◽  
Petroleum Refinery ◽  
Treatment Plant ◽  
Granular Sludge ◽  
Activated Sludge Process ◽  
Sludge Treatment ◽  
Oil Emulsion ◽  
Water In Oil Emulsion ◽  
Aerobic Sludge

Abstract Aerobic sludge from a municipal activated sludge treatment plant, sludge from a conventional municipal anaerobic digester, aerobic sludge from an activated sludge process of a petroleum refinery, and granular sludge from an upflow sludge blanket reactor (USBR) were tested in the deemulsification of a water-in-oil emulsion. All sludges except the last one, showed a good deemulsification capability and could he used for a partial deemulsification of such emulsions. The rate and degree of the deemulsifications increased with an increase in sludge concentrations. The deemulsifications were faster at 85°C and required smaller amounts of sludge than in the case of the deemulsifications at room temperature. An extended stirring (up to a certain limit) in the course of the dispersion of sludge emulsion helped the deemulsification. Too vigorous agitation had an adverse effect. The deemulsification effect of sludge became less visible with an increase in the dilution of emulsion which caused an increase in its spontaneous deemulsification.

Solids Concentrations in a Treatment Plant Effluent

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2543-2546
Author(s):  
M. Defrain ◽  
F. Schmidt
Keyword(s):  
Waste Water ◽  
Activated Sludge ◽  
Federal Republic ◽  
Treatment Plant ◽  
Analysis Procedure ◽  
Process Water ◽  
Federal Republic Of Germany ◽  
Output Variable ◽  
Sludge Treatment ◽  
Sewerage Network

In the calculations customarily used to dimension nitrification and denitrification plants in the Federal Republic of Germany, solids in the influent of the biological stage represent a significant output variable. Numerous modified methods based on nationally and internationally standardized analysis procedures are available to determine solids concentrations in waste-water. Tests showed that different values are measured depending on the method of analysis employed. Harmonization of the analysis procedure is advisable to ensure comparable conditions for the calculation of activated sludge tank volumes. The solids reaching a treatment plant originate from two main sources. Filterable materials are passed to the treatment plant via the preceding sewerage network with its industrial and commercial users, but are also carried by process water from sludge treatment. The influence of process water on wastewater composition is illustrated by reference to the Wuppertal-Buchenhofen treatment plant.

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