scholarly journals Inhibition of Activated Sludge Respiration by Heavy Metals

2020 ◽  
Vol 14 ◽  
Keyword(s):  
Waste Water ◽  
Heavy Metals ◽  
Heavy Metal ◽  
Water Treatment ◽  
Activated Sludge ◽  
Waste Water Treatment ◽  
Domestic Waste ◽  
Heavy Metal Concentrations ◽  
Water Treatment Plants ◽  
Different Types

Inhibition of the respiration microbial activity in the activated sludge caused by heavy metal concentrations (Cr, Cd, Cu and Ni) was studied by means of respirometric method using Strathtox respirometer (Strathkelvin Glasgow).The studied sludge samples were obtained from the two waste water treatment plants with different types of pollution (municipal waste water and domestic waste water)

Research Progress in Removing Heavy Metals from Waste Water via Bio-Sorption

2014 ◽  
Vol 587-589 ◽  
pp. 692-695
Author(s):  
Wei Sun
Keyword(s):  
Waste Water ◽  
Heavy Metals ◽  
Heavy Metal ◽  
Water Treatment ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Waste Water Treatment ◽  
Research Progress ◽  
Traditional Methods ◽  
Sorption Method

Bio-absorption has an unparalleled advantage over other traditional methods in removing and recycling heavy metal ions from waste water. Consequently, it has a promising future. In this paper, the traditional methods and the bio-sorption method via which heavy metals are removed from waste water are compared to summarize the mechanism of bio-sorption, the types of bio-sorbent, the factors that can influence bio-sorption and the state of its application in waste water treatment .

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.

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 Study of Within-year Changes of Hydrocoles Composition in Aeration Tanks in the Process of Waste Water Treatment

2012 ◽  
pp. 90-95
Author(s):  
Keyword(s):  
Waste Water ◽  
Heavy Metals ◽  
Water Treatment ◽  
Activated Sludge ◽  
Waste Water Treatment ◽  
Micro Organisms

Activated sludge micro/organisms classes’ composition has been studied in the annual regime of biological facilities operation. Dependence of heavy metals concentration influence on the hydrocoles’ composition has been shown.

Operational aspects on foaming in digesters caused by microthrix parvicella

1998 ◽  
Vol 38 (8-9) ◽  
pp. 29-34 ◽  
Author(s):  
Åsa Dillner Westlund ◽  
Eva Hagland ◽  
Maria Rothman
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Activated Sludge ◽  
Gas Phase ◽  
Waste Water Treatment ◽  
Gas Bubbles ◽  
Excess Sludge ◽  
Water Treatment Plants ◽  
Microthrix Parvicella ◽  
Operational Aspects

Foaming in the digesters has been observed several times at three large waste water treatment plants in Stockholm, Sweden. The foam is caused by the filamentous organism Microthrix parvicella, a hydrophobic filament which traps the gas bubbles and creates a foam. The foam in the digesters causes economical loss and a security hazard. Different solutions to prevent problems with foaming has been tried and applied. By increasing the sludge load in the biological stage the growth of Microthrix parvicella can be reduced. Decreasing the sludge level in the digesters or installing mixers in the gas phase can prevent the foam from blocking the gas pipe. Heating (70°C, 5 min) the excess sludge has in lab scale been shown to change the foam potential of activated sludge with a high content of Microthrix parvicella and could be used as a solution to prevent foaming.

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