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

Biodegradation of aniline

1997 ◽  
Vol 36 (10) ◽  
pp. 53-63 ◽  
Author(s):  
Shabbir H. Gheewala ◽  
Ajit P. Annachhatre
Keyword(s):  
Activated Sludge ◽  
Ammonia Oxidation ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Inhibitory Effect ◽  
Synthetic Wastewater ◽  
Nitrifying Bacteria ◽  
Aquatic Life ◽  
Oxidation Rates ◽  
Batch Tests

Discharge of aniline to the environment must be controlled as aniline is toxic to aquatic life and also exerts additional oxygen demand due to nitrification reaction involved during its biodegradation. Organic carbonaceous removal by heterotrophs during aniline biodegradation releases NH4+ which is the substrate for autotrophic nitrifying bacteria. However, aniline is toxic to nitrifying bacteria and severely inhibits their activity. Accordingly, batch and continuous studies were conducted to assess the biodegradation of aniline and its inhibitory effect on nitrification. Synthetic wastewater was used as feed with aniline as sole carbon source for mixed microbial population. Experiments were conducted at ambient temperatures of 30–32°C. An aerobic activated sludge Unit was operated at an HRT of about 13 hours and SRT of about 12 days. Biomass from aerobic activated sludge process treating domestic wastewater was acclimatized to synthetic wastewater Containing aniline. Removal efficiencies more than 95% were obtained for feed aniline concentrations upto 350 mg/l with insignificant inhibition of nitrification due to aniline. Ammonia oxidation rates of about 20–115 mgNH4N/l/d were observed. Batch tests were carried out to test the inhibitory effects of high initial aniline concentrations on nitritication. Carbonaceous removal by heterotrophs proceeded rapidly within 4–6 hours with nitrification picking up as soon as aniline concentration dropped below 3–4 mg/l. For higher initial aniline concentration more than 250 mg/l, complete nitrification did not take place even after aniline Concentration dropped below 3–4 mg/l.

scholarly journals Evaluation of the Inhibitory Effect of Cu2+, Al3+ and Zn2+ on the Activated Sludge

2015 ◽  
Vol 31 (2) ◽  
pp. 87-93
Author(s):  
Chang-Gyu Kim ◽  
Yo-Yong Kim ◽  
Ik-Beom Park ◽  
Jin-Ho Song ◽  
Woo-Kyong Nam ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Inhibitory Effect

On the effect of pharmaceuticals on bacterial nitrite oxidation

2004 ◽  
Vol 50 (5) ◽  
pp. 341-346 ◽  
Author(s):  
S.N. Dokianakis ◽  
M.E. Kornaros ◽  
G. Lyberatos
Keyword(s):  
Activated Sludge ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Reduction Rate ◽  
Inhibitory Effect ◽  
Significant Inhibition ◽  
Nitrite Reduction ◽  
Municipal Wastewater Treatment ◽  
Nitrite Oxidizing Bacteria ◽  
Municipal Wastewater Treatment Plants

Pharmaceuticals or their metabolites are partially excreted with urine or faeces ending up in raw sewage. Many of these substances are not biodegradable and their presence in influents of municipal wastewater treatment plants may cause adverse effects to sensitive biological processes such as nitrification, while on the other hand, they may go through the activated sludge process unreacted. The second step of nitrification, i.e. oxidation of nitrite to nitrate is particularly sensitive. Inhibition of this step under uncontrolled conditions may lead to accumulation of nitrite nitrogen in the plant effluent, a form of nitrogen which is particularly toxic. The effects caused by the presence of seven different pharmaceuticals to a culture of nitrite-oxidizing bacteria isolated from activated sludge are presented. These pharmaceuticals were ofloxacin, propranolol, clofibrate, triclosan, carbamazepine, diclofenac and sulfamethoxazole. Different effects were observed for each of the pharmaceuticals tested in this study. In the cases of ofloxacin and sulfamethoxazole significant inhibition was observed. Triclosan presented a substantial inhibitory effect on the substrate (nitrite) reduction rate. The long-term effect of triclosan on nitrite oxidizers was also examined in a CSTR reactor and conclusions were drawn regarding the reversibility of the inhibition caused by this compound.

Inhibitory effect of triclosan and nonylphenol on respiration rates and ammonia removal in activated sludge systems

2008 ◽  
Vol 70 (2) ◽  
pp. 199-206 ◽  
Author(s):  
Athanasios S. Stasinakis ◽  
Daniel Mamais ◽  
Nikolaos S. Thomaidis ◽  
Elena Danika ◽  
Georgia Gatidou ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Inhibitory Effect ◽  
Ammonia Removal ◽  
Respiration Rates ◽  
Activated Sludge Systems

The inhibitory effect of in situ extracellular polymeric substances on trimethoprim adsorption by activated sludge

Chemosphere ◽  
2021 ◽  
Vol 274 ◽  
pp. 129798
Author(s):  
You Ma ◽  
Pei-Kun Yuan ◽  
Yu Wu ◽  
Xin-Ying Cheng ◽  
Han Meng ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Extracellular Polymeric Substances ◽  
Inhibitory Effect

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.

Ammonium-oxidizing bacteria facilitate aerobic degradation of sulfanilic acid in activated sludge

2014 ◽  
Vol 70 (6) ◽  
pp. 1122-1128 ◽  
Author(s):  
Gang Chen ◽  
Maneesha P. Ginige ◽  
Anna H. Kaksonen ◽  
Ka Yu Cheng
Keyword(s):  
Activated Sludge ◽  
Oxygen Uptake Rate ◽  
Substrate Inhibition ◽  
Inhibitory Effect ◽  
Sulfanilic Acid ◽  
Ammonium Concentration ◽  
Microbial Culture ◽  
High Concentration ◽  
Mixed Microbial Culture ◽  
First Time

Sulfanilic acid (SA) is a toxic sulfonated aromatic amine commonly found in anaerobically treated azo dye contaminated effluents. Aerobic acclimatization of SA-degrading mixed microbial culture could lead to co-enrichment of ammonium-oxidizing bacteria (AOB) because of the concomitant release of ammonium from SA oxidation. To what extent the co-enriched AOB would affect SA oxidation at various ammonium concentrations was unclear. Here, a series of batch kinetic experiments were conducted to evaluate the effect of AOB on aerobic SA degradation in an acclimatized activated sludge culture capable of oxidizing SA and ammonium simultaneously. To account for the effect of AOB on SA degradation, allylthiourea was used to inhibit AOB activity in the culture. The results indicated that specific SA degradation rate of the mixed culture was negatively correlated with the initial ammonium concentration (0–93 mM, R2 = 0.99). The presence of AOB accelerated SA degradation by reducing the inhibitory effect of ammonium (≥10 mM). The Haldane substrate inhibition model was used to correlate substrate concentration (SA and ammonium) and oxygen uptake rate. This study revealed, for the first time, that AOB could facilitate SA degradation at high concentration of ammonium (≥10 mM) in an enriched activated sludge culture.

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