Elimination of human enteric viruses during conventional waste water treatment by activated sludge

1986 ◽  
Vol 32 (12) ◽  
pp. 922-925 ◽  
Author(s):  
Pierre Payment ◽  
Sylvie Fortin ◽  
Michel Trudel
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Activated Sludge ◽  
Waste Water Treatment ◽  
Enteric Viruses ◽  
Sludge Treatment ◽  
Poliovirus Type ◽  
The Mean ◽  
Human Enteric Viruses ◽  
Type 3

The present study was undertaken to determine if viruses were selectively eliminated during waste water treatment. Human enteric viruses were detected at all steps of treatment in a conventional activated sludge waste water treatment plant. Liquid overlays and large volume sampling with multiple passages on BGM cells permitted the detection of poliovirus (serotypes 1, 2, and 3), coxsackievirus B (serotypes 1, 2, 3, 4, and 5), and echovirus (serotypes 3, 14, and 22), as well as reoviruses. The mean virus concentration was 95.1 most probable number of infectious units per litre (mpniu/L) in raw sewage, 23.3 in settled water, 1.4 in effluent after activated sludge treatment, and 40.3 mpniu/L in sludge samples. All samples of raw sewage and settled water, 79% of effluent water, and 94% of sludge samples contained viruses. The mean reduction was 75% after settling and 98% after activated sludge treatment. Poliovirus type 3 was rarely isolated after the activated sludge treatment, but was still detected in about one-third of the sludge samples. Reoviruses and coxsackieviruses were detected at similar rates from all samples and appear to be more resistant to the activated sludge treatment than poliovirus type 3. Poliovirus types 1 and 2 were present in almost every sample of raw sewage and settled water and still found in about half of the effluent and sludge samples, indicating a level of resistance similar to that of reoviruses and coxsackieviruses.

Application of Models in Developing Control Strategies for Activated Sludge Waste Water Treatment Plants

1984 ◽  
Vol 16 (5-7) ◽  
pp. 587-594 ◽  
Author(s):  
A Holmberg ◽  
J Forsström
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Activated Sludge ◽  
Control Strategies ◽  
Waste Water Treatment ◽  
Control Algorithms ◽  
Flow Rates ◽  
Simulation Techniques ◽  
Water Treatment Plants ◽  
Sludge Waste

This paper studies control of activated sludge plants using recycle and wastage flow rates as control variables. The behaviour of the control algorithms was studied using simulation techniques. The results indicate that the process is not sensitive to the recycle flow rate. Wastage flow control with the objective to keep the sludge concentration constant turned out to be promising.

Experiences with the World’s Largest Municipal Waste Water Treatment Plant Using Membrane Technology

2006 ◽  
Vol 1 (4) ◽  
Author(s):  
N. Engelhardt ◽  
W. Lindner
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Activated Sludge ◽  
Membrane Filtration ◽  
Anthropogenic Impacts ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Waste Water Treatment Plant ◽  
Economic Point

With the commissioning of the waste water treatment plant Nordkanal, which has been dimensioned for a design capacity of 80,000 population equivalents, new worldwide standards for the implementation of large membrane-activated sludge plants have been created both from a technical and from an economic point of view. The hitherto successful operation of this plant has already now contributed towards this technology becoming suitable for use in large waste water treatment plants. The now two years the waste water treatment plant Nordkanal has been in operation have once again demonstrated that even on a large scale, membrane-activated sludge plants are able to reliably produce purified effluent of excellent quality, while simultaneously providing a small-sized design. They prove advantageous everywhere small-sized designs are sought after and the purified effluent has to meet high or special requirements. Wherever purification requirements are intensified in the foreseeable future, whether with regard to the hygienisation of effluent, or in the framework of re-using purified waste water as industrial water or potable water or in order to protect natural drinking water resources from critical anthropogenic impacts, the membrane bioreactor process or membrane filtration is trend setting and will increasingly gain in importance.

scholarly journals Comparison of bioindicator eukaryotes of activated sludge biocenoses on two water-treatment plants: a case study

2017 ◽  
Vol 16 (1) ◽  
pp. 54-60 ◽  
Author(s):  
Farida Y. Achmadulina ◽  
Rustem K. Zakirov ◽  
Elena S. Balymova ◽  
Vera Denisova ◽  
Taťjána Brovdyová ◽  
...  
Keyword(s):  
Waste Water ◽  
Chemical Composition ◽  
Water Treatment ◽  
Activated Sludge ◽  
Waste Water Treatment ◽  
High Water ◽  
Water Treatment Plants ◽  
The City ◽  
Main Factor

Abstract Activated sludge biocenoses were compared on waste-water treatment plants in the city of Kazan, Russian Federation and the city of Teplice, Czech Republic. Based on Palia-Kovnatski index, Acanthamoeba in Kazan, Epistylis in Teplice, and Acanthamoeba and Centropyxis were dominant genera in both plants. The major subdominant generas identified were Arcella, Opercularia and Aspidisca. This indicates high nitrification ability, high water purification potential and matured activated sludge. Chemical composition of the waste-water was identified as the main factor determining the sludge biocenoses diversity. Higher sludge biodiversity (Shannon, Margalef, and Sorensen indexes) was found in Kazan corresponding to more concentrated inflow water.

Quainification and Characterisation of Nitrosomonas and Nitrobacter Using Monoclonal Antibodies

1994 ◽  
Vol 29 (7) ◽  
pp. 1-6 ◽  
Author(s):  
B. Sandén ◽  
C. Grunditz ◽  
Y. Hansson ◽  
G. Dalhammar
Keyword(s):  
Waste Water ◽  
Monoclonal Antibodies ◽  
Water Treatment ◽  
Activated Sludge ◽  
Waste Water Treatment ◽  
Enzyme Linked Immunosorbent Assay ◽  
Water Treatment Plants ◽  
Waste Water Treatment Plants ◽  
Activity Measurements ◽  
Pure Cultures

Nitrobacter and Nitrosomonas were isolated in pure cultures from two large waste water treatment plants in the Stockholm area. Using the hybridoma technique, monoclonal antibodies were produced specific for Nitrobacter and Nitrosomonas respectively. Using a competitive ELISA (enzyme linked immunosorbent assay) we can estimate cell numbers in pure cultures of the bacteria as well as in activated sludge. The antibody directed against Nitrobacter was tested with sludge from several waste water treatment plants in the Stockholm area and is able to recognise Nitrobacter, indicating a common epitope. There is a good correlation between activity measurements and cell number estimations in activated sludge indicating that we have the necessary tools to further develop a method for the quick and reliable detection and quantification of Nitrobacter and Nitrosomonas.

scholarly journals Denitrifying Bacterial Isolation from Activated Sludge of Swine Waste Water Treatment and Carbon Source and Temperature Demanded for Denitrification

1992 ◽  
Vol 63 (1) ◽  
pp. 38-46
Author(s):  
Norihide KAKIICHI ◽  
Yoshihiko ISHIZAKI ◽  
Shuhei TOMITA ◽  
Osamu TIO ◽  
Toshiyuki MATSUNAGA ◽  
...  
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Carbon Source ◽  
Activated Sludge ◽  
Waste Water Treatment ◽  
Swine Waste ◽  
Bacterial Isolation
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