Dewaterability of Excess Activated Sludge with Fly Ash Conditioning

The coal fly ash (CFA)/coal fly ash modified by sulfuric acid (MCFA)-conditioned sludge dewaterability was investigated in this study. Specific resistance of filtration (SRF) was used to assess the sludge dewaterability. Extracellular polymeric substance (EPS) was determined in attempt to explain sludge conditioning process. The results showed that SRF of the sludge significantly decreased with coal fly ash addition, and the MCFA showed much stronger conditioning capacity than the raw coal fly ash. Under a MCFA dosage of 36g.L-1, the SRF of the sludge decreased from 1.18×1012 to 6.47×1010 m.kg1, and EPS concentration of the sludge decreased from 32.64 to 17.55mg.L-1. The sludge conditioning mechanisms with MCFA mainly included improving adsorption bridging and providing the water transmitting passages by skeleton builder.

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Sewage sludge conditioning with coal fly ash modified by sulfuric acid

Chemical Engineering Journal ◽

10.1016/j.cej.2010.02.021 ◽

2010 ◽

Vol 158 (3) ◽

pp. 616-622 ◽

Cited By ~ 105

Author(s):

Changya Chen ◽

Panyue Zhang ◽

Guangming Zeng ◽

Jiuhua Deng ◽

Yu Zhou ◽

...

Keyword(s):

Sulfuric Acid ◽

Fly Ash ◽

Sewage Sludge ◽

Coal Fly Ash ◽

Sludge Conditioning

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Phase Diagrams of (NH4)2SO4–Al2(SO4)3–H2O Ternary System: Effect of Sulfuric Acid and Its Application in Recovery of Aluminum from Coal Fly Ash

Journal of Chemical & Engineering Data ◽

10.1021/acs.jced.8b00740 ◽

2018 ◽

Vol 64 (2) ◽

pp. 557-566 ◽

Cited By ~ 8

Author(s):

Fanqi Meng ◽

Weizao Liu ◽

Guanrun Chu ◽

Hairong Yue ◽

Bin Liang ◽

...

Keyword(s):

Sulfuric Acid ◽

Fly Ash ◽

Ternary System ◽

Phase Diagrams ◽

Coal Fly Ash ◽

System Effect

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Improving Dehydration Property of Elutriation Sludge by CPAM and Modified Coal Fly Ash

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.955-959.2926 ◽

2014 ◽

Vol 955-959 ◽

pp. 2926-2930

Author(s):

Lin Pei Dong ◽

Ji Ling Zhan ◽

Xin Li

Keyword(s):

Molecular Weight ◽

Fly Ash ◽

Moisture Content ◽

Specific Resistance ◽

Coal Fly Ash ◽

Granular Sludge ◽

Aerobic Granular Sludge ◽

Joint Control ◽

Relative Molecular Weight ◽

Dehydration Effect

This article studied the dehydration effect of elutriation sludge produced in the process of cultivating aerobic granular sludge, which is a joint regulation of cationic polyacrylamide (CPAM) and modified coal fly ash, using sludge specific resistance(SRF) and moisture content of sludge extent as the target. The results show that the greater the relative molecular weight, the better effect is. CPAM whose relative molecular weight is 8 million is the best type when solo casted. When casted by15 mg/L, SRF is reduced to 0.43×108 S2/g, The 1 g/L coal fly ash and 15 mg/L 8 million CPAM joint control, SRF is reduced to 0.4×108 S2/g, moisture content is 72.04%. When using modified coal fly ash, the result is better. Modified coal fly ash can effectively promote the efficiency of CPAM as the coagulant aid. It can further reduce SRF and moisture content of the sludge. We can observe the effects modified coal fly ash joint CPAM has on elutriation sludge morphology by scanning electron microscopy (SEM).

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