Mild hydrogen peroxide interceded bacterial disintegration of waste activated sludge for efficient biomethane production

2022 ◽  
pp. 152873
Author(s):  
Preethi ◽  
J. Rajesh Banu ◽  
S. Kavitha ◽  
R. Yukesh Kannah ◽  
Sunita Varjani ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Activated Sludge ◽  
Waste Activated Sludge ◽  
Biomethane Production

scholarly journals Volatile Fatty Acids and Biomethane Recovery from Thickened Waste Activated Sludge: Hydrothermal Pretreatment’s Retention Time Impact

Processes ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 1580
Author(s):  
Farokh laqa Kakar ◽  
Ahmed El Sayed ◽  
Neha Purohit ◽  
Elsayed Elbeshbishy
Keyword(s):  
Fatty Acids ◽  
Activated Sludge ◽  
Retention Time ◽  
Volatile Fatty Acids ◽  
Oxygen Demand ◽  
Hydrothermal Pretreatment ◽  
Waste Activated Sludge ◽  
Optimum Conditions ◽  
Pretreatment Temperature ◽  
Biomethane Production

The main objective of this study was to evaluate the hydrothermal pretreatment’s retention time influence on the volatile fatty acids and biomethane production from thickened waste activated sludge under mesophilic conditions. Six different retention times of 10, 20, 30, 40, 50, and 60 min were investigated while the hydrothermal pretreatment temperature was kept at 170 °C. The results showed that the chemical oxygen demand (COD) solubilization increased by increasing the hydrothermal pretreatment retention time up to 30 min and stabilized afterwards. The highest COD solubilization of 48% was observed for the sample pretreated at 170 °C for 30 min. Similarly, the sample pretreated at 170 °C for 30 min demonstrated the highest volatile fatty acids yield of 14.5 g COD/Lsubstrate added and a methane yield of 225 mL CH4/g TCODadded compared to 4.3 g COD/Lsubstrate added and 163 mL CH4/g TCODadded for the raw sample, respectively. The outcome of this study revealed that the optimum conditions for solubilization are not necessarily associated with the best fermentation and/or digestion performance.

scholarly journals Towards a metagenomic understanding on enhanced biomethane production from waste activated sludge after pH 10 pretreatment

2013 ◽  
Vol 6 (1) ◽  
pp. 38 ◽  
Author(s):  
Mabel Ting Wong ◽  
Dong Zhang ◽  
Jun Li ◽  
Raymond Kin Hi Hui ◽  
Hein Min Tun ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Waste Activated Sludge ◽  
Biomethane Production

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 Effect of H2O2Oxidation/Alkaline Hydrolysis on Waste Activated Sludge Disintegration and Dewaterability

2018 ◽  
Vol 65 ◽  
pp. 05021 ◽  
Author(s):  
Gan Chin Heng ◽  
Mohamed Hasnain Isa ◽  
Ming Han Lim
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Time ◽  
Activated Sludge ◽  
Alkaline Hydrolysis ◽  
Optimum Operating ◽  
Waste Activated Sludge ◽  
Operating Parameters ◽  
Peroxide Oxidation ◽  
Operating Variables ◽  
H2o2 Oxidation

In the present study, the effect of hydrogen peroxide oxidation/alkaline hydrolysis was investigated on waste activated sludge (WAS), to enhance its disintegration and dewaterability. The effects of three operating parameters viz., pH, H2O2dose and reaction time, on the degree of WAS disintegration and dewaterability were assessed using response surface methodology. The optimum operating variables to achieve VSS removal 20%, CST reduction 20%, sCOD 6100 mg/L and EPS 455 mg/L were: pH 10.5, 1300 g H2O2/kg TS and 40 min reaction time. Results showed that WAS can be efficiently disintegrated and dewatered by H2O2 oxidation/alkaline hydrolysis for subsequent biological digestion.

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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