scholarly journals Virus removal by activated sludge treatment

1982 ◽  
Vol 18 (1) ◽  
pp. 27-32
Author(s):  
Etsuko SHIMOHARA ◽  
Shinroku SUGISHIMA
Keyword(s):  
Activated Sludge ◽  
Sludge Treatment ◽  
Virus Removal

Virus Removal by Activated Sludge Treatment

1985 ◽  
Vol 17 (10) ◽  
pp. 153-158 ◽  
Author(s):  
E. Shimohara ◽  
S. Sugishima ◽  
M. Kaneko
Keyword(s):  
Activated Sludge ◽  
Low Temperatures ◽  
Virus Inactivation ◽  
Batch Experiments ◽  
Anaerobic Conditions ◽  
Sludge Treatment ◽  
Virus Removal ◽  
Virus Survival ◽  
Activated Sludge Processes

Removal of poliovirus 1 by activated sludge treatment in batch experiments was investigated, virus counts were reduced by more than 99% under conditions of 0.2 to 0.4 kg BOD.kg MLSS−1.day−1 and MLSS concentrations of 1,000 to 2,000 mg.l−1. There were no distinct relationships between BOD-SS loadings or TOC of the effluent and virus inactivation rates. MLSS levels of more than 800 mg.l−1 were necessary for more than 99% reduction in viral counts. Although MLSS levels of more than 2,000 mg.l−1 reduced viral counts by 4 log values, factors such as low temperatures and anaerobic conditions which adversely affect the efficiency of activated sludge processes, resulted in prolonged virus survival.

scholarly journals Virus removal by activated sludge treatment

1980 ◽  
Vol 15 (2) ◽  
pp. 21-27
Author(s):  
Etsuko HAYASHI ◽  
Shinroku SUGISHIMA
Keyword(s):  
Activated Sludge ◽  
Sludge Treatment ◽  
Virus Removal

Behaviour of Mechanically Blended Return-Sludge in Absence of Substrate

1970 ◽  
Vol 5 (1) ◽  
pp. 34-54
Author(s):  
Shyam D. Bokil ◽  
Jatinder K. Bewtra
Keyword(s):  
Activated Sludge ◽  
Suspended Solids ◽  
Treatment Plant ◽  
Aeration Rate ◽  
Batch Experiments ◽  
Sludge Treatment ◽  
Waring Blender ◽  
Settling Characteristics

Abstract Nine sets of batch experiments, each of ten to twelve days duration, were conducted in the laboratory on return-sludge samples collected from activated sludge treatment plant at Windsor. The thickened sludge samples were blended daily in a waring blender and were continuously aerated in twelve-litres capacity jars. Parallel runs were made on control sludge samples which were not blended. Amongst the parameters varied were the speed and frequency of blending and the aeration rate. The effects of these variables on progressive bio-degradation of volatile suspended solids and the settling characteristics of the sludge were determined. Blended sludge showed significant improvement in the rate of bio-degradation and its settling characteristics as compared to the control unblended sludge

Deemulsification of Water-in-Oil Emulsion with Sludges

1987 ◽  
Vol 22 (3) ◽  
pp. 437-443 ◽  
Author(s):  
N. Kosaric ◽  
Z. Duvnjak
Keyword(s):  
Activated Sludge ◽  
Room Temperature ◽  
Petroleum Refinery ◽  
Treatment Plant ◽  
Granular Sludge ◽  
Activated Sludge Process ◽  
Sludge Treatment ◽  
Oil Emulsion ◽  
Water In Oil Emulsion ◽  
Aerobic Sludge

Abstract Aerobic sludge from a municipal activated sludge treatment plant, sludge from a conventional municipal anaerobic digester, aerobic sludge from an activated sludge process of a petroleum refinery, and granular sludge from an upflow sludge blanket reactor (USBR) were tested in the deemulsification of a water-in-oil emulsion. All sludges except the last one, showed a good deemulsification capability and could he used for a partial deemulsification of such emulsions. The rate and degree of the deemulsifications increased with an increase in sludge concentrations. The deemulsifications were faster at 85°C and required smaller amounts of sludge than in the case of the deemulsifications at room temperature. An extended stirring (up to a certain limit) in the course of the dispersion of sludge emulsion helped the deemulsification. Too vigorous agitation had an adverse effect. The deemulsification effect of sludge became less visible with an increase in the dilution of emulsion which caused an increase in its spontaneous deemulsification.

Application of Three Step-Biological Pond with the Use of Aquatic Plant for Post Treatment of Petroleum Wastewater in Vietnam

1991 ◽  
Vol 23 (7-9) ◽  
pp. 1503-1507 ◽  
Author(s):  
L. M. Triet ◽  
N. T. Viet ◽  
T. V. Thinh ◽  
H. D. Cuong ◽  
J. C. L. van Buuren
Keyword(s):  
Dissolved Oxygen ◽  
Activated Sludge ◽  
Residence Time ◽  
Aquatic Plants ◽  
Water Hyacinth ◽  
Aquatic Plant ◽  
Post Treatment ◽  
Cod Removal ◽  
Sludge Treatment ◽  
Purification Efficiency

The effluent from activated sludge treatment of petroleum wastewater was treated with the aid of a ponding system using aquatic plants (Water Hyacinth, Chlorella, Reed). A good result was obtained in this study. Pilot pond system shows that the purification efficiency depends on the residence time of about 14 days. The petroleum removal waa 97-98 %, the COD removal was from 88-93 %. The dissolved oxygen amount (with Chlorella) increased from 0.7 mg/l to 9.8 mg/l and the pH increased from 6.9 to 8-8.6. The application of 3 step biological pond with the use of Water Hyacinth, Chlorella, Reeds for post treatment of petroleum wastewater is appropriate in Vietnam.

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