A comparative study between mechanical, thermal and oxidative disintegration techniques of waste activated sludge

2002 ◽  
Vol 46 (10) ◽  
pp. 79-87 ◽  
Author(s):  
P. Camacho ◽  
S. Deleris ◽  
V. Geaugey ◽  
P. Ginestet ◽  
E. Paul
Keyword(s):  
Comparative Study ◽  
Activated Sludge ◽  
Contact Time ◽  
Waste Activated Sludge ◽  
Sludge Flocs ◽  
Oxidative Treatment ◽  
Mineral Fraction ◽  
Wide Range ◽  
Micro Organisms ◽  
Limiting Value

The release performances of an organic and mineral activated sludge matrix were studied for a wide range of disintegration treatments like mechanical, thermal, thermal-chemical and oxidative disintegration techniques. The maximal COD release was 35% of total COD after 24 hours contact time at 95°C. A limiting value of 60% COD release was obtained for 500 and 700 bars after 10 passes. Concerning the oxidative disintegration techniques (O3 and H2O2), a limiting value of around 60-65% of TOC release was observed. Therefore, it was hypothesised that thermal and mechanical treatments allow mainly for breaking apart the micro-organisms while the oxidative treatment destroys the sludge flocs and disrupts the micro-organisms. A release effect of the mineral fraction is observed only oxidative disintegration techniques.

A comparative study of waste activated sludge conditioning with Fe(II)-peroxymonosulfate oxidative process

2020 ◽  
Vol 11 ◽  
pp. 100434
Author(s):  
Wanqing Ding ◽  
Wenbiao Jin ◽  
Xu Zhou ◽  
Lan Wang ◽  
Yibin Xiu ◽  
...  
Keyword(s):  
Comparative Study ◽  
Activated Sludge ◽  
Waste Activated Sludge ◽  
Oxidative Process ◽  
Sludge Conditioning

scholarly journals Operational characteristics of an innovative device dedicated for the hydrodynamic disintegration of sewage sludge

2019 ◽  
Vol 116 ◽  
pp. 00105
Author(s):  
Monika Zubrowska-Sudol ◽  
Agnieszka Garlicka ◽  
Justyna Walczak ◽  
Katarzyna Sytek-Szmeichel ◽  
Aleksandra Mikołajczak ◽  
...  
Keyword(s):  
Energy Density ◽  
Sewage Sludge ◽  
Activated Sludge ◽  
Waste Activated Sludge ◽  
Disintegration Process ◽  
Sludge Flocs ◽  
Mechanical Disintegration ◽  
Operational Characteristics ◽  
New Apparatus

This paper presents the results of the first stage of the project, aimed at the assessment of the applicability of the new apparatus for disintegration of excess waste activated sludge. It was documented that the analysed device allows for disintegration of sewage sludge with an efficiency comparable to that obtained in other devices dedicated for mechanical disintegration of sewage sludge described in the literature. The disintegration process at energy density in a range of 35–210 kJ/l resulted in the release from activated sludge flocs of 219–515 mg SCOD/l for 35 kJ/l to 2138–4884 mg SCOD/l for 210 kJ/l.

Enhancing waste activated sludge dewaterability by reducing interaction energy of sludge flocs

2020 ◽  
pp. 110328
Author(s):  
Wenbo Yu ◽  
Yanlei Wan ◽  
Yu Wang ◽  
Yuwei Zhu ◽  
Shuangyi Tao ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Interaction Energy ◽  
Waste Activated Sludge ◽  
Sludge Flocs ◽  
Sludge Dewaterability

Waste activated sludge disintegration by hydroxyl and sulfate radical-based oxidation: a comparative study

2019 ◽  
Vol 5 (11) ◽  
pp. 2027-2040 ◽  
Author(s):  
Hanife Sari Erkan
Keyword(s):  
Hydrogen Peroxide ◽  
Comparative Study ◽  
Activated Sludge ◽  
Sulfate Radical ◽  
Waste Activated Sludge ◽  
Calcium Hypochlorite

To the best of my knowledge, this is the first study in the literature where hydrogen peroxide, calcium hypochlorite, peroxymonosulfate and peroxydisulfate were comparatively investigated in a study.

scholarly journals THE EFFECT OF HYDROTHERMAL PRETREATMENT ON THE ANAEROBIC DIGESTION OF THICKENED WASTE ACTIVATED SLUDGE AND SOURCE SEPARATED ORGANICS

2021 ◽  
Author(s):  
Ahmad Shabir Razavi
Keyword(s):  
Activated Sludge ◽  
Retention Time ◽  
Hydrothermal Pretreatment ◽  
Waste Activated Sludge ◽  
Pretreatment Condition ◽  
Wide Range ◽  
Biomethane Production ◽  
Pretreatment Conditions ◽  
The Impact ◽  
Severity Indexes

The objective of this study was to evaluate the impact of hydrothermal pretreatment of source separated organics (SSO) and thickened waste activated sludge (TWAS) on the solubilization and biomethane production. The feedstocks went through 15 different conditions in a wide range of temperature (150-240°C), retention time (5-30) min and severity indexes (3-5). The result of the study revealed that the effect of hydrothermal pretreatment can vary based on the feedstock primary properties and the optimum pretreatment condition. In this study, the optimum pretreatment conditions for highest solubilization and solid reduction of the SSO were 220°C and 10 minutes retention time, however, for highest methane production, it was 190°C for 20 minutes. In case of TWAS, the result revealed that the maximum biomethane production was achieved at pretreatment conditions of 160°C and 20 min, while, the highest solubilization and solid reduction was observed in 220°C and 10 minutes retention time.

Bioflocculation in Activated Sludge, an Analytic Approach

1992 ◽  
Vol 25 (4-5) ◽  
pp. 441-443 ◽  
Author(s):  
V. Urbain ◽  
J. C. Block ◽  
J. Manem
Keyword(s):  
Activated Sludge ◽  
Hydrophobic Interactions ◽  
Surface Characteristics ◽  
Positive Role ◽  
Sludge Flocs ◽  
Physico Chemical ◽  
Micro Organisms ◽  
Different Origins ◽  
Sludge Settleability

A study on the physico-chemical structure of activated sludge flocs was carried out to get a better insight in its relation with sludge settleability. For this purpose, sixteen sludges from different origins were analysed in order to provide information with regard to their settleability, biomass and exocellular composition, surface characteristics and internal hydrophobicity. The presence of filamentous micro-organisms was observed in all samples but was not always associated with poor settleability, supporting to some extent the idea of their role as a backbone in the flocs. The relations between variables were studied through their linear correlations. Exocellular polymers (ECP) were associated with poor settling conditions. The chemical composition of the ECP (the DNA fraction and the C/N ratio) had an influence on the surface characteristics of the flocs. Finally, sludge settleability was described with a mathematical model, opposing the ECP and the internal hydrophobicity of the flocs. The positive role of hydrophobic interactions, in term of settleability, should provide a new approach in the understanding of flocculation mechanisms in activated sludge.

scholarly journals THE EFFECT OF HYDROTHERMAL PRETREATMENT ON THE ANAEROBIC DIGESTION OF THICKENED WASTE ACTIVATED SLUDGE AND SOURCE SEPARATED ORGANICS

2021 ◽  
Author(s):  
Ahmad Shabir Razavi
Keyword(s):  
Activated Sludge ◽  
Retention Time ◽  
Hydrothermal Pretreatment ◽  
Waste Activated Sludge ◽  
Pretreatment Condition ◽  
Wide Range ◽  
Biomethane Production ◽  
Pretreatment Conditions ◽  
The Impact ◽  
Severity Indexes

The objective of this study was to evaluate the impact of hydrothermal pretreatment of source separated organics (SSO) and thickened waste activated sludge (TWAS) on the solubilization and biomethane production. The feedstocks went through 15 different conditions in a wide range of temperature (150-240°C), retention time (5-30) min and severity indexes (3-5). The result of the study revealed that the effect of hydrothermal pretreatment can vary based on the feedstock primary properties and the optimum pretreatment condition. In this study, the optimum pretreatment conditions for highest solubilization and solid reduction of the SSO were 220°C and 10 minutes retention time, however, for highest methane production, it was 190°C for 20 minutes. In case of TWAS, the result revealed that the maximum biomethane production was achieved at pretreatment conditions of 160°C and 20 min, while, the highest solubilization and solid reduction was observed in 220°C and 10 minutes retention time.

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