Immobilized-microbial bioaugmentation protects aerobic denitrification from heavy metal shock in an activated-sludge reactor

2020 ◽  
Vol 307 ◽  
pp. 123185 ◽  
Author(s):  
Xuan Yu ◽  
Juanjuan Shi ◽  
Aman Khan ◽  
Hui Yun ◽  
Pengyun Zhang ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Activated Sludge ◽  
Aerobic Denitrification ◽  
Activated Sludge Reactor

Enhanced heavy metal uptake by activated sludge cultures grown in the presence of biopolymer stimulators

1996 ◽  
Vol 34 (5-6) ◽  
pp. 267-272 ◽  
Author(s):  
Ken Fukushi ◽  
Duk Chang ◽  
Sam Ghosh
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Activated Sludge ◽  
G Protein ◽  
Metal Uptake ◽  
Heavy Metal Uptake ◽  
Culture Viability ◽  
Grown Culture

The objective of this research was to investigate the feasibility of developing improved activated sludge cultures capable of removing heavy metals. Cystine, peptone, and β-glycerophosphate (BGP) stimulated metal uptake without the significant reduction of culture viability otherwise experienced in the absence of these chemicals. The cystine-peptone-BGP-grown culture exhibited the highest removal of copper and cadmium of 5.67 and 2.53 mM/g protein, respectively.

scholarly journals Investigation of Heavy Metal Effects on the Anaerobic Co-Digestion Process of Waste Activated Sludge and Septic Tank Sludge

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Quang-Minh Nguyen ◽  
Duy-Cam Bui ◽  
Thao Phuong ◽  
Van-Huong Doan ◽  
Thi-Nham Nguyen ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Activated Sludge ◽  
Removal Efficiency ◽  
Biogas Production ◽  
Cod Removal ◽  
Septic Tank ◽  
Waste Activated Sludge ◽  
Digestion Process ◽  
Cod Removal Efficiency

The effect of copper, zinc, chromium, and lead on the anaerobic co-digestion of waste activated sludge and septic tank sludge in Hanoi was studied in the fermentation tests by investigating the substrate degradation, biogas production, and process stability at the mesophilic fermentation. The tested heavy metals were in a range of concentrations between 19 and 80 ppm. After the anaerobic tests, the TS, VS, and COD removal efficiency was 4.12%, 9.01%, and 23.78% for the Cu(II) added sample. Similarly, the efficiencies of the Zn(II) sample were 1.71%, 13.87%, and 16.1% and Cr(VI) efficiencies were 15.28%, 6.6%, and 18.65%, while the TS, VS, and COD removal efficiency of the Pb(II) added sample was recorded at 16.1%, 17.66%, and 16.03% at the concentration of 80 ppm, respectively. Therefore, the biogas yield also decreased by 36.33%, 31.64%, 31.64%, and 30.60% for Cu(II), Zn(II), Cr(VI), and Pb(II) at the concentration of 80 ppm, compared to the raw sample, respectively. These results indicated that Cu(II) had more inhibiting effect on the anaerobic digestion of the sludge mixture than Zn(II), Cr(VI), and Pb(II). The relative toxicity of these heavy metals to the co-digestion process was as follows: Cu (the most toxic) > Zn > Cr > Pb (the least toxic). The anaerobic co-digestion process was inhibited at high heavy metal concentration, which resulted in decreased removal of organic substances and produced biogas.

Aerobic denitrification by a heterotrophic nitrifying-aerobic denitrifying (HN-AD) culture enriched activated sludge

2016 ◽  
Vol 21 (6) ◽  
pp. 2113-2118 ◽  
Author(s):  
Kyoung-Jin Choi ◽  
Shan Zhang ◽  
Ji Hyeon Song ◽  
Sun-Jin Hwang
Keyword(s):  
Activated Sludge ◽  
Aerobic Denitrification

scholarly journals Systematic Multimodeling Methodology Applied to an Activated Sludge Reactor Model

2010 ◽  
Vol 49 (6) ◽  
pp. 2790-2799 ◽  
Author(s):  
Anca Maria Nagy ◽  
Gilles Mourot ◽  
Benoît Marx ◽  
José Ragot ◽  
Georges Schutz
Keyword(s):  
Activated Sludge ◽  
Reactor Model ◽  
Activated Sludge Reactor

Disturbance observer for estimation of oxygen uptake rate in an activated sludge reactor

2016 ◽  
Author(s):  
Francisco Jadilson dos Santos Silva ◽  
Euler C. T. de Macedo ◽  
Sebastian Y. C. Catunda ◽  
Carlos E. T. Dorea ◽  
Adrianus C. Van Haandel
Keyword(s):  
Oxygen Uptake ◽  
Activated Sludge ◽  
Uptake Rate ◽  
Disturbance Observer ◽  
Oxygen Uptake Rate ◽  
Activated Sludge Reactor

A comparison of NH4/NO3 control strategies for alternating activated sludge processes

1999 ◽  
Vol 39 (4) ◽  
pp. 93-102 ◽  
Author(s):  
L. J. S. Lukasse ◽  
K. J. Keesman ◽  
A. Klapwijk ◽  
G. van Straten
Keyword(s):  
Activated Sludge ◽  
Time Delays ◽  
Control Strategies ◽  
Treatment Plant ◽  
Biological Processes ◽  
Effluent Quality ◽  
N Removal ◽  
Activated Sludge Reactor ◽  
The Difference ◽  
Activated Sludge Processes

Four control strategies for N-removal in alternating activated sludge plants (ASP's) are compared: 1. timer-based, 2. switching the aeration on/off when depletion of nitrate/ammonium is detected, 3. switching the aeration on/off when ammonium crosses an upper/lower-bound, 4. the newly developed adaptive receding horizon optimal controller (ARHOC) as presented in Lukasse et al. (1997). The comparison is made by simulating the controllers' application to an alternating continuously-mixed activated sludge reactor preceded by a small anoxic reactor for predenitrification. The biological processes in the reactors are modelled by the activated sludge model no. 1. Realistic influent patterns, measured at a full-scale wastewater treatment plant, are used. The results show that three totally different controllers (timer-based, NH4-bounds based and ARHOC) can achieve a more or less equal effluent quality, if tuned optimally. The difference mainly occurs in the sensitivity to suboptimal tunings. The timer-based strategy has a higher aeration demand. The sensitivity of the ARHOC controller to sub-optimal tuning, known measurement time delays and changing plant loads is significantly less than that of the other controllers. Also its tuning is more natural and explicit.

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