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

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

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.

Improving dewaterability of waste activated sludge by combined conditioning with zero-valent iron and hydrogen peroxide

2014 ◽  
Vol 174 ◽  
pp. 103-107 ◽  
Author(s):  
Xu Zhou ◽  
Qilin Wang ◽  
Guangming Jiang ◽  
Xiwang Zhang ◽  
Zhiguo Yuan
Keyword(s):  
Hydrogen Peroxide ◽  
Activated Sludge ◽  
Zero Valent Iron ◽  
Waste Activated Sludge

Comparison of Aerobic and Anoxic-Aerobic Digestion of Waste Activated Sludge

1985 ◽  
Vol 17 (8) ◽  
pp. 1475-1478 ◽  
Author(s):  
A P. C. Warner ◽  
G. A. Ekama ◽  
G v. R. Marais
Keyword(s):  
Experimental Data ◽  
Activated Sludge ◽  
Waste Activated Sludge ◽  
Activated Sludge Process ◽  
Cycle Times ◽  
Waste Sludge ◽  
Volatile Solids ◽  
In Series ◽  
Flow Through ◽  
Theoretical Simulations

The laboratory scale experimental investigation comprised a 6 day sludge age activated sludge process, the waste sludge of which was fed to a number of digesters operated as follows: single reactor flow through digesters at 4 or 6 days sludge age, under aerobic and anoxic-aerobic conditions (with 1,5 and 4 h cycle times) and 3-in-series flow through aerobic digesters each at 4 days sludge age; all digesters were fed draw-and-fill wise once per day. The general kinetic model for the aerobic activated sludge process set out by Dold et al., (1980) and extended to the anoxic-aerobic process by van Haandel et al., (1981) simulated accurately all the experimental data (Figs 1 to 4) without the need for adjusting the kinetic constants. Both theoretical simulations and experimental data indicate that (i) the rate of volatile solids destruction is not affected by the incorporation of anoxic cycles and (ii) the specific denitrification rate is independent of sludge age and is K4T = 0,046(l,029)(T-20) mgNO3-N/(mg active VSS. d) i.e. about 2/3 of that in the secondary anoxic of the single sludge activated sludge stystem. An important consequence of (i) and (ii) above is that denitrification can be integrated easily in the steady state digester model of Marais and Ekama (1976) and used for design (Warner et al., 1983).

TREATABILITY OF 2,4-D PRODUCTION WASTEWATERS

1994 ◽  
Vol 30 (3) ◽  
pp. 73-78 ◽  
Author(s):  
O. Tünay ◽  
S. Erden ◽  
D. Orhon ◽  
I. Kabdasli
Keyword(s):  
Hydrogen Peroxide ◽  
Activated Sludge ◽  
Partial Oxidation ◽  
Chloride Concentration ◽  
Chemical Oxidation ◽  
Cod Removal ◽  
Optimum Conditions ◽  
Organic Loading ◽  
Activated Sludge System ◽  
Biological Treatability

This study evaluates the characterization and treatability of 2,4-D production wastewaters. Wastewaters contain 20000-40000 mg/l COD, 17000-30000 mg/l chloride and pH is around 1.0. Chemical oxidation with hydrogen peroxide provided almost complete COD removal. The optimum conditions are 3:1 H2O2/COD oxidant dosage, 3000 mg/l Fe3+ as catalyst and pH 3. Partial oxidation at 0.5:1 H2O2//COD ratio is also effective providing 67% COD removal. A batch activated sludge system is used for biological treatability. Dilution is needed to maintain a tolerable chloride concentration which increases through COD removal. pH also increased during COD removal. 85% COD removal is obtained for the 50% dilution at an organic loading of 0.3 day‒1 on a COD basis. Completely and partially oxidized wastewaters are also treated in the activated sludge down to 30 mg/l BOD5.

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