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

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.

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Compared effects of “solid-based” hydrogen peroxide pretreatment on disintegration and properties of waste activated sludge

Chinese Chemical Letters ◽

10.1016/j.cclet.2021.08.002 ◽

2021 ◽

Author(s):

Hai-Chao Luo ◽

Wan-Qian Guo ◽

Qi Zhao ◽

Hua-Zhe Wang ◽

Nan-Qi Re

Keyword(s):

Hydrogen Peroxide ◽

Activated Sludge ◽

Waste Activated Sludge

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Improvement of anaerobic digestion of waste-activated sludge by using H2O2 oxidation, electrolysis, electro-oxidation and thermo-alkaline pretreatments

Environmental Science and Pollution Research ◽

10.1007/s11356-015-4677-2 ◽

2015 ◽

Vol 22 (19) ◽

pp. 14717-14726 ◽

Cited By ~ 36

Author(s):

Emna Feki ◽

Sonia Khoufi ◽

Slim Loukil ◽

Sami Sayadi

Keyword(s):

Anaerobic Digestion ◽

Activated Sludge ◽

Waste Activated Sludge ◽

H2o2 Oxidation ◽

Electro Oxidation

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Optimization of leachate treatment using persulfate/H2O2 based advanced oxidation process: case study: Deir El-Balah Landfill Site, Gaza Strip, Palestine

Water Science & Technology ◽

10.2166/wst.2015.468 ◽

2015 ◽

Vol 73 (1) ◽

pp. 102-112 ◽

Cited By ~ 8

Author(s):

Ahmed H. Hilles ◽

Salem S. Abu Amr ◽

Rim A. Hussein ◽

Anwar I. Arafa ◽

Olfat D. El-Sebaie

Keyword(s):

Reaction Time ◽

Advanced Oxidation Process ◽

Gaza Strip ◽

Oxygen Demand ◽

Operating Conditions ◽

Optimum Operating ◽

Leachate Treatment ◽

Operating Variables ◽

Treatment Processes ◽

N Removal

The objective of this study was to investigate the performance of employing H2O2 reagent in persulfate activation to treat stabilized landfill leachate. A central composite design (CCD) with response surface methodology (RSM) was applied to evaluate the relationships between operating variables, such as persulfate and H2O2 dosages, pH, and reaction time, to identify the optimum operating conditions. Quadratic models for the following two responses proved to be significant with very low probabilities (<0.0001): chemical oxygen demand (COD) and NH3-N removal. The obtained optimum conditions included a reaction time of 116 min, 4.97 g S2O82−, 7.29 g H2O2 dosage and pH 11. The experimental results were corresponding well with predicted models (COD and NH3-N removal rates of 81% and 83%, respectively). The results obtained in the stabilized leachate treatment were compared with those from other treatment processes, such as persulfate only and H2O2 only, to evaluate its effectiveness. The combined method (i.e., /S2O82−/H2O2) achieved higher removal efficiencies for COD and NH3-N compared with other studied applications.

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Adsorption of Fluorine from Aqueous Solution by Chitosan Magnetic Microspheres of Loading Lanthanum

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.634-638.367 ◽

2013 ◽

Vol 634-638 ◽

pp. 367-374 ◽

Cited By ~ 1

Author(s):

Jin Song Wang ◽

Feng Rong Fang ◽

Heng Yue ◽

Qing Wei Guo ◽

Zhen Cheng Xu

Keyword(s):

Reaction Time ◽

Removal Rate ◽

Fluoride Concentration ◽

Correlation Coefficients ◽

Freundlich Isotherm ◽

Magnetic Microspheres ◽

Optimum Operating ◽

Operating Parameters ◽

Sorption Data ◽

Effects Of Ph

The adsorption of fluoride by chitosan magnetic microspheres of loading lanthanum metal (CTS-La) was investigated in this study. The chitosan magnetic materials were prepared by organically-linking technique. The effects of pH, the reaction time, the initial concentration, dosage and temperature on the removal rate were studied to determine to the optimum operating parameters. The experimental results show that CTS-La is a black particle shape material with magnetism. The magnetic microspheres have high adsorption ability for fluoride, and the maximum removal of F- was 98.4% under the operating parameters of the initial fluoride concentration 10mg/L, pH=2-3,the reaction time 60minutes, dosage 0.1g, temperature 318K. . The equilibrium sorption data are fitted reasonably well in Langmuir and Freundlich isotherm model, and the correlation coefficients (R2) were Langmuir’s correlation and 0.9997 respectively.

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

Environmental Science Water Research & Technology ◽

10.1039/c9ew00663j ◽

2019 ◽

Vol 5 (11) ◽

pp. 2027-2040 ◽

Cited By ~ 2

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.

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