title: [Synergistic effects of nano-sized magnetic particles and uncoupler to the characteristics of activated sludge].
abstract: For improving the performance and sludge settling property of an activated sludge reduction process with uncoupler, in this investigation, uncoupler and nano-sized magnetic particles were added simultaneously to a sequencing batch reactor for exploring their synergistic effects to the characteristics of activated sludge. The results showed that the volume reduction of sludge reached 41% with single 2,4,5-Trichlorophenol (TCP) Comparing with the control experiment, the biodegradability and settling properties of the activated sludge decreased. Under the actions of TCP combined with nano-sized magnetic particles, the volume reduction of sludge reached 34%, the removal efficiencies of COD, nitrogen, and phosphorus as well as the sludge settling property were not significantly influenced. After 31 d's operation, the dehydrogenase activity was improved by 10%-18% and exhibited an accumulative effect over time. It was observed with an optical microscope that the species and amounts of protozoon and metazoan increased and a compact structure of sludge floc was formed. The results also indicated that using nano-sized magnetic particles and uncoupler could restrict the yield of excess sludge and improve the performance of an activated sludge system.
authors.affiliation: Faculty of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China. gly6822@163.com
authors.forename: Li-ying
authors.initials: LY
authors.lastname: Gao
authors.forename: Bing
authors.initials: B
authors.lastname: Tang
authors.forename: Ling-yan
authors.initials: LY
authors.lastname: Liang
authors.forename: Shao-song
authors.initials: SS
authors.lastname: Huang
authors.forename: Feng-lian
authors.initials: FL
authors.lastname: Fu
authors.forename: Jian-zhong
authors.initials: JZ
authors.lastname: Luo
mesh_terms: D002733:Chlorophenols / Q000737:chemistry; D002947:Cities; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D009584:Nitrogen / Q000302:isolation & purification; D010758:Phosphorus / Q000302:isolation & purification; D012722:Sewage / Q000032:analysis / Q000737:chemistry*; D014475:Uncoupling Agents / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry
chemical_list: D002733:Chlorophenols; D058185:Magnetite Nanoparticles; D009584:Nitrogen; D010758:Phosphorus; D012722:Sewage; D014475:Uncoupling Agents; D062065:Wastewater; C009534:2,4,5-trichlorophenol