GUO Bo,TIAN Yu,FAN Chen,et al. Sludge Conditioning by Green Iron Nanoparticles/H2O2 Combined with Amphoteric Dewatering Agent [J].China Water & Wastewater,2020,36(13):62-67.
Sludge Conditioning by Green Iron Nanoparticles/H2O2 Combined with Amphoteric Dewatering Agent
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
13
Page:
62-67
Column:
Date of publication:
2020-07-01
- Abstract:
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Aiming at the difficult problem of sludge dewatering in wastewater treatment plants, Fenton-like reagent［green synthetic iron nanoparitcles (GS-Fe-NPs)/H2O2］ combined with amphoteric polymer sludge dewatering agent was used to condition the sludge.The influences of?H2O2 dosage, initial pH value, temperature, reaction time and?GS-Fe-NPs dosage on conditioning of sludge by the Fentonlike oxidization were investigated. When sludge initial pH was 6.82 (not adjusted), dosages of?GS-Fe-NPs and?H2O2 were 1.0 g/L and 3.0 g/L, temperature was 20 ℃ and reaction time was 1 hour, the sludge water content could be reduced to 70.3% after centrifugation. At the same time, the soluble COD (SCOD), polysaccharide and protein in the sludge supernatant increased by 8.8, 13.2 and 13.9 times respectively after conditioning, indicating that extracellular polymeric substance (EPS) of the sludge was effectively destroyed. Under the same operational conditions, the relative contents of hydroxyl radical (·OH) in the three treatment systems were measured, and the relative content from large to small wasGS-Fe-NPs/H2O2>nZVI/H2O2>Fe2+/H2O2, suggesting that the system of GS-Fe-NPs/H2O2 had the strongest oxidation capacity. It could further improve the dewatering performance of sludge effectively by adding dewatering agent PADS to the conditioned sludge.
Last Update:
2020-07-01