title: The role of stress agents as operating factors in formation and functioning of granular aerobic activated sludge at model domestic wastewater treatment.
abstract: Maintenance of the wastewater treatment plants and increasing the efficiency of existing aerobic biological reactors depend on the stability of activated sludge characteristics under varying wastewater parameters within significant limits and/or influence of some environmental factors. The steady microbial communities observed in biofilms and anaerobic granules of activated sludge can serve as successful samples of formation of the similar aerobic systems. The granular aerobic sludge obtained in the course of our researches is an ideal "plant" on treatment of biogenic pollution at both low and high concentrations. It demonstrates high ability for treatment and stability to adverse factors. To improve aerobic wastewater treatment characteristics, a possibility of using impact of stress conditions upon activated sludge has been studied. Under conditions of fractional hydrogen peroxide addition at diffused lighting, the granular aerobic activated sludge adapted to hydrogen peroxide has been obtained. This sludge has got good sedimentary properties and it differs from the control sample in the species diversity, improved treatment characteristics and also resistance to the stressor. It also endures an impact of one-time hydrogen peroxide addition up to 1.2-1.5 g H2O2/l. The conditions under which the steady aerobic granules of the diameter from 2 to 5 mm were formed with high treatment ability have been chosen. The granules were being stabilized at passages with hydrogen peroxide treatment and they endured up to 2.4-3.0 g/l of one-time H2O2 addition.
authors.affiliation: Faculty of Biotechnology and Industrial Ecology, D.I. Mendeleyev University of Chemical Technology of Russia, 9 Miusskaya square, Moscow, 125047, Russia.
authors.forename: Nikolay S
authors.initials: NS
authors.lastname: Khokhlachev
authors.forename: Sergei V
authors.initials: SV
authors.lastname: Kalenov
authors.forename: Olga S
authors.initials: OS
authors.lastname: Zanina
authors.forename: Dmitry V
authors.initials: DV
authors.lastname: Tyupa
authors.forename: Marina M
authors.initials: MM
authors.lastname: Baurina
authors.forename: Alexander Ye
authors.initials: AY
authors.lastname: Kuznetsov
mesh_terms: D000332:Aerobiosis; D057919:Biological Oxygen Demand Analysis; D012722:Sewage; D062065:Wastewater; D018508:Water Purification
chemical_list: D012722:Sewage; D062065:Wastewater