Enhancement of waste activated sludge disintegration and dewaterability by 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.

Download Full-text

Removal of phenolic endocrine disrupting compounds from waste activated sludge using UV, H2O2, and UV/H2O2 oxidation processes: Effects of reaction conditions and sludge matrix

The Science of The Total Environment ◽

10.1016/j.scitotenv.2014.05.149 ◽

2014 ◽

Vol 493 ◽

pp. 307-323 ◽

Cited By ~ 79

Author(s):

Ai Zhang ◽

Yongmei Li

Keyword(s):

Activated Sludge ◽

Endocrine Disrupting Compounds ◽

Waste Activated Sludge ◽

Reaction Conditions ◽

Oxidation Processes ◽

Endocrine Disrupting ◽

H2o2 Oxidation

Download Full-text

Enhancement of waste activated sludge disintegration and dewaterability by H2O2 oxidation

Civil, Offshore and Environmental Engineering ◽

10.1201/b21942-52 ◽

2016 ◽

pp. 263-266 ◽

Cited By ~ 1

Author(s):

G Heng ◽

K Chen ◽

M Isa

Keyword(s):

Activated Sludge ◽

Waste Activated Sludge ◽

H2o2 Oxidation

Download Full-text

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

Water Science & Technology ◽

10.2166/wst.1985.0068 ◽

1985 ◽

Vol 17 (8) ◽

pp. 1475-1478 ◽

Cited By ~ 6

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).

Download Full-text