The Inhibitory Effect of Salinity Anaerobic Microorganism Based on Kinetics Model

2015 ◽  
Vol 1092-1093 ◽  
pp. 651-654
Author(s):  
Xiao Ling Zou
Keyword(s):  
Activated Sludge ◽  
Granular Sludge ◽  
Inhibitory Effect ◽  
Kinetic Constants ◽  
Kinetics Model ◽  
Inhibition Kinetics ◽  
Anaerobic Microorganism ◽  
Velocity Constant ◽  
Anaerobic Microorganisms

This paper compares the inhibitory effect of high CaCl2and MgCl2content on anaerobic microorganism based on kinetics model. Salt inhibition kinetics experiments were performed at granular sludge and activated sludge in order to investigate salt inhibition effects on kinetic constants. Half-velocity constantvalues considerably increased when CaCl2or MgCl2concentration increased from 0 to 35g/L for granular sludge and activated sludge. Salt inhibition biokinetic coefficients (Kρ) were obtained by using Ghose and Tyagi model. For granular sludge,Kρof CaCl2was found to be 130.3 g/L, andKρof MgCl2was found to be 86 g/L. For activated sludge,Kρof CaCl2was found to be 92.8 g/L, andKρof MgCl2was found to be 77.6 g/L. Results showed that the inhibitory CaCl2limit was higher than the inhibitory MgCl2limit for anaerobic microorganisms.

scholarly journals Removal of crystal violet from aqueous solutions using an aerobic granular sludge system

2021 ◽  
Vol 3 (1) ◽  
pp. 55-60
Author(s):  
Costel Bumbac ◽  
◽  
Elena Elisabeta Manea ◽  
Olga Tiron
Keyword(s):  
Activated Sludge ◽  
Respiration Rate ◽  
Crystal Violet ◽  
Treatment Cycle ◽  
Granular Sludge ◽  
Inhibitory Effect ◽  
Aerobic Granular Sludge ◽  
Specific Test ◽  
Conventional Activated Sludge ◽  
The Matrix

The paper presents a set of comparative tests to evaluate the inhibitory effect of crystal violet on the respiration rate of microorganisms in conventional activated sludge and aerobic granular sludge. The tests were performed in similar conditions with the only variable of the type of sludge tested. The results emphasized that the aerobic granular sludge is less susceptible to the toxicity induced by crystal violet. The concentration of crystal violet that inhibits by 50% (CE50) the respiration rate of sludge microorganisms was determined to be, for the specific test conditions, 22.39 mg/L for the conventional activated sludge and 33.88 mg/L for the aerobic granular sludge. The paper also assesses the biodegradability potential of crystal violet from aqueous solution, in the presence of sodium acetate as co-substrate in a lab-scale sequential biological reactor with aerobic granular sludge. The experiments showed that most of the crystal violet is being initially absorbed in the matrix of the granules during the first minutes and subsequently is being removed with efficiencies above 95% within a treatment cycle of 8 hours.

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.

Single and joint inhibitory effect of nitrophenols on activated sludge

2021 ◽  
Vol 294 ◽  
pp. 112945
Author(s):  
Zhuowei Zhang ◽  
Yin Yu ◽  
Hongbo Xi ◽  
Yuexi Zhou
Keyword(s):  
Activated Sludge ◽  
Inhibitory Effect

Textile wastewater treatment: Aerobic granular sludge vs activated sludge systems

2014 ◽  
Vol 54 ◽  
pp. 337-346 ◽  
Author(s):  
Adriana Maria Lotito ◽  
Marco De Sanctis ◽  
Claudio Di Iaconi ◽  
Giovanni Bergna
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Granular Sludge ◽  
Textile Wastewater ◽  
Aerobic Granular Sludge ◽  
Textile Wastewater Treatment ◽  
Activated Sludge Systems

Comparison between kinetics of autochthonous marine bacteria in activated sludge and granular sludge systems at different salinity and SRTs

2019 ◽  
Vol 148 ◽  
pp. 425-437 ◽  
Author(s):  
Santo Fabio Corsino ◽  
Marco Capodici ◽  
Francesca Di Pippo ◽  
Valter Tandoi ◽  
Michele Torregrossa
Keyword(s):  
Activated Sludge ◽  
Marine Bacteria ◽  
Granular Sludge ◽  
Kinetics Of

Determination of Kinetic Constants of Activated Sludge Microorganisms

1985 ◽  
Vol 17 (2-3) ◽  
pp. 259-272 ◽  
Author(s):  
J. S. Čech ◽  
J. Chudoba ◽  
P. Grau
Keyword(s):  
Activated Sludge ◽  
Mixed Culture ◽  
Removal Rate ◽  
Mixed Cultures ◽  
Kinetic Constants ◽  
Type Reactor ◽  
Substrate Removal ◽  
Velocity Coefficient ◽  
Mixed Reactor

A respirometric method for measuring kinetic constants of activated sludge microorganisms by means of a simple respirometer was developed and tested by using two types of mixed culture. It has been found that both the maximum substrate removal rate and the half-velocity coefficient are basically lower with the mixed cultures cultivated in a completely-mixed reactor /filamentous/ than with those cultivated in a selector-type reactor /nonfilamentous/.

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