Aerobic Sludge Digestion
Mostrando 1-12 de 12 artigos, teses e dissertações.
-
1. Effectiveness of Five Biosolids as Nitrogen Sources to Produce Single and Cumulative Ryegrass Harvests in Two Australian Soils
ABSTRACT Biosolids have been produced by various stabilization processes of sewage sludge, but little attention has been given to the effects of such treatments on their effectiveness to supply nitrogen for plant growth. Here, we investigated these effects by cultivating Lolium perenne (ryegrass) in two Australian soils, a sandy Spodosol and a clayey Oxisol.
Rev. Bras. Ciênc. Solo. Publicado em: 23/06/2016
-
2. Characterization and treatment of sludge originated from septic tanks / Caracterização e pré-tratamento de lodo de fossas e de tanques sépticos
Septic tanks are small structures used for partial treatment of wastewater produced from urban and rural areas. It utilization is justify mainly by simplicity of construction and for being a technology that requires low operational dedication. Although it is a technology vastly used in Brazil, there is not much information about the characteristics of the wa
Publicado em: 2009
-
3. Avaliação da aplicação de acido folico em tratamento aerobio de aguas residuarias. / Evaluation of application of folic acid in aerobic wastewater treatment .
They are deficiency of vitamins in sludge of biological wastewater treatment, especially the folic acid, that acts as micronutrient for certain bacteria and stimulating its growth. This work evaluated the effect of different concentrations of folic acid on the sludge in normal physiologic conditions and in endogenous respiration. The system was carried out b
Publicado em: 2007
-
4. Avaliação da partida de reator anaeróbio de fluxo ascendente e manta de lodo (UASB), em escala real, sob condições hidráulicas desfavoráveis / Start-up of a full-scale upflow anaerobic sludge blanket (UASB) reactor, treating domestic sewage, under unfavorable hydraulic conditions
Este estudo teve como objetivo avaliar a partida de reator anaeróbio de fluxo ascendente e manta de lodo (UASB), em escala real, no tratamento de esgoto sanitário, sob condições hidráulicas desfavoráveis. O reator UASB faz parte do sistema de tratamento da ETE Água Vermelha, e é seguido de um biofiltro aerado submerso e de uma unidade de desinfecçã
Publicado em: 2007
-
5. Enteric bacteria in aerobically digested sludge.
Indicator bacteria, Salmonella spp., and total aerobic bacteria were determined in samples of undigested sludge and sludge that had been treated by one or two stages of aerobic digestion. Aerobic sludge digestion reduced the level of indicator bacteria by 1 to 2 log10 per g. The level of Salmonella spp. was also reduced during aerobic treatment of sludge. In
-
6. Bacterial survival and association with sludge flocs during aerobic and anaerobic digestion of wastewater sludge under laboratory conditions.
The fate of indicator bacteria, a bacterial pathogen, and total aerobic bacteria during aerobic and anaerobic digestion of wastewater sludge under laboratory conditions was determined. Correlation coefficients were calculated between physical and chemical parameters (temperature, dissolved oxygen, pH, total solids, and volatile solids) and either the daily c
-
7. Recovery of indigenous enteroviruses from raw and digested sewage sludges.
We examined different types of raw sewage sludge treatment, including consolidation, anaerobic mesophilic digestion with subsequent consolidation, and aerobic-thermophilic digestion. Of these, the most efficient reduction in infectious virus titer was achieved by mesophilic digestion with subsequent consolidation, although a pilot-scale aerobic-thermophilic
-
8. Survival rates of parasite eggs in sludge during aerobic and anaerobic digestion.
The effects of mesothermic anaerobic or aerobic sludge digestion on survival of eggs from the roundworms Ascaris suum, toxocara canis, Trichuris vulpis, and Trichuris suis and from the rat tapeworm Hymenolepis diminuta were studied. Destruction of eggs throughout a 15-day treatment period, as well as their viabilities after reisolation, was analyzed. The lab
-
9. Inactivation of animal viruses during sewage sludge treatment.
Using a previously developed filter adsorption technique, the inactivation of a human rotavirus, a coxsackievirus B5, and a bovine parvovirus was monitored during sludge treatment processes. During conventional anaerobic mesophilic digestion at 35 to 36 degrees C, only minor inactivation of all three viruses occurred. The k' values measured were 0.314 log10
-
10. Survival of parasite eggs upon storage in sludge.
Destruction rates of parasite eggs in stored sludge were examined to help understand the fate of these agents of enteric diseases in sludge lagoons. Eggs from the roundworms, Ascaris spp., Toxocara spp., Trichuris spp., and the tapeworm, Hymenolepis spp., were treated with domestic sludges by aerobic or anaerobic processes. Sludge samples seeded with eggs we
-
11. Development of quantitative methods for the detection of enteroviruses in sewage sludges during activation and following land disposal.
The development and evaluation of methods for the quantitative recovery of enteroviruses from sewage sludge are reported. Activated sewage sludge solids were collected by centrifugation, and elution of the solid-associated virus was accomplished by mechanical agitation in glycine buffer at pH 11.0. Eluted viruses were concentrated either onto an aluminum hyd
-
12. Removal of Plant Nutrients by Means of Aerobic Stabilization of Sludge
In the conventional treatment of sewage, the solids are normally disposed of by anaerobic digestion. This leaves a considerable amount of plant nutrients, such as nitrogen and phosphate, as soluble compounds which will eventually find their way into the plant's final effluent, since the supernatant fluid from the digesters is normally returned to the raw sew