Sludge reduction in an activated sludge sewage treatment process by lysis-cryptic growth using ClO2-ultrasonication disruption

2012 ◽  
Vol 68 ◽  
pp. 54-60 ◽  
Author(s):  
Jiatian Lin ◽  
Yongyou Hu ◽  
Guanghua Wang ◽  
Wangcheng Lan
Keyword(s):  
Activated Sludge ◽  
Treatment Process ◽  
Sewage Treatment ◽  
Sludge Reduction ◽  
Cryptic Growth

scholarly journals Unravelling diversity and metabolic potential of microbial consortia at each stage of leather sewage treatment

RSC Advances ◽  
2017 ◽  
Vol 7 (66) ◽  
pp. 41727-41737 ◽  
Author(s):  
Hebin Liang ◽  
Dongdong Ye ◽  
Lixin Luo
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Treatment Process ◽  
Sewage Treatment ◽  
Microbial Consortia ◽  
Biological Wastewater Treatment ◽  
Metabolic Potential ◽  
Ecological Functions ◽  
Wastewater Treatment Process ◽  
System P

Activated sludge is essential for the biological wastewater treatment process and the identification of active microbes enlarges awareness of their ecological functions in this system.

Evaluation of a new model for the reduction of excess sludge production by ozonation of return activated sludge: what solids COD fraction is affected?

2011 ◽  
Vol 63 (1) ◽  
pp. 156-163 ◽  
Author(s):  
Dominic Frigon ◽  
Siavash Isazadeh
Keyword(s):  
Activated Sludge ◽  
Metabolic Adaptation ◽  
Model Parameters ◽  
Specific Rate ◽  
Sludge Reduction ◽  
Growth Data ◽  
Active Biomass ◽  
Model Extension ◽  
Cryptic Growth ◽  
Sludge Production

This paper aims at clarifying the effect of ozone on the RAS solids to model activated sludge systems equipped with RAS-ozonation processes for the reduction of sludge production. A common hypothesis is that ozone only affects active biomass by promoting cryptic growth. Data from a pilot-scale study were used to test this and two other model extensions to IWA-ASM3. All model extensions were able to simulate the observed linear reduction in sludge production with increasing ozone dose when the MLVSS are kept constant. However, model simulations showed the inconsistency of the cryptic growth hypothesis with the extent of sludge reduction. The second tested model extensions assumes that ozone affects all the solids fractions (active biomass, endogenous residue, and influent inert particulate COD) equally. This extension could properly simulate the observed sludge reduction, but it failed to predict the trends in effluent BOD5, ATP/VSS, and nitrification rates. A third tested model extension, which performed better, assumes that biomass is inactivated at a specific rate higher than the specific rate of transformation by ozone of the other solids fractions. Finally, the predictions from this model extension were most accurate if either (i) the nitrifiers were inactivated at a lower rate then heterotrophs, (ii) the nitrifiers model parameters (e.g., maximum growth rate) were changed under ozone (i.e., metabolic adaptation, (iii) or both.

Distribution of ammonia-oxidizing bacteria in sewage activated sludge: analysis based on 16S rDNA sequence

2004 ◽  
Vol 50 (8) ◽  
pp. 9-14 ◽  
Author(s):  
T. Limpiyakorn ◽  
Y. Shinohara ◽  
F. Kurisu ◽  
O. Yagi
Keyword(s):  
Activated Sludge ◽  
16S Rdna ◽  
Treatment Process ◽  
Sewage Treatment ◽  
Pcr Amplification ◽  
Ammonia Oxidizing Bacteria ◽  
Conventional Activated Sludge ◽  
Process Configuration ◽  
Nitrosomonas Oligotropha ◽  
Activated Sludge Systems

This study carried out analysis of ammonia-oxidizing bacteria (AOB) communities in 12 sewage activated sludge systems standing in eight sewage treatment plants located in Tokyo. The systems were different in the treatment process configuration: anaerobic/anoxic/aerobic (A2O), anaerobic/aerobic (AO), and conventional activated sludge (AS) processes. AOB communities were analyzed by sequences of 16S rDNA amplicons, which were separated by denaturing gradient gel eletrophoresis (DGGE) after specific polymerase chain reaction (PCR) amplification. The results demonstrated that low ammonium concentrations in the influents of the 12 sewage activated sludge systems resulted in the dominance of Nitrosomonas oligotropha-like sequences. Further, Nitrosomonas europaea- and Nitrosomonas cryotolerans-like sequences were recovered from only one A2O system of which the influent contained higher ammonium and chloride concentrations than those of other systems. Nitrosomonas communis-like sequences were found in every A2O and AO system, but mostly not found in every AS system. In summary, influent characteristics and treatment process configuration affected the AOB communities in the 12 sewage activated sludge systems.

Research on the Impact of Precipitates Produced with Fe2+ as a Coagulant Plays on Water Quality

2014 ◽  
Vol 687-691 ◽  
pp. 4339-4342
Author(s):  
Ying Zhang ◽  
Lei Zhu ◽  
Jie Fan
Keyword(s):  
Water Quality ◽  
Activated Sludge ◽  
Significant Influence ◽  
Phosphorus Removal ◽  
Treatment Process ◽  
Sewage Treatment ◽  
Phosphate Content ◽  
Change Trend ◽  
The Impact

Fe2+ is widely used as a coagulant to enhance the primary SBR sewage treatment process. Based on SBR system, this paper studies the change trend of phosphate content in various stages by simulating the interaction between sewage and the precipitates produced with Fe2+ in the sediment as a coagulant. The results indicate that excluding the impact of activated sludge, the concentration of PO43+ increases in the end of the anaerobic stage with the increase of FePO4 cumulant in the sediment and there is an equimultiple relationship between the increase of the concentration of PO43+ in the effluent and the FePO4 dosage and that the accumulation of Fe (OH)3 can contribute to the subsequent sustainable phosphorus removal, but the cumulant increase of Fe (OH)3 has no significant influence on the effects of phosphorus removal.

Advanced sewage treatment process with excess sludge reduction and phosphorus recovery

2005 ◽  
Vol 39 (5) ◽  
pp. 902-910 ◽  
Author(s):  
W. Saktaywin ◽  
H. Tsuno ◽  
H. Nagare ◽  
T. Soyama ◽  
J. Weerapakkaroon
Keyword(s):  
Treatment Process ◽  
Sewage Treatment ◽  
Phosphorus Recovery ◽  
Sludge Reduction ◽  
Excess Sludge ◽  
Excess Sludge Reduction

Research Progress: Reduction of Excess Sludge by Ozone in the Sewage Biotreatment Process

2012 ◽  
Vol 610-613 ◽  
pp. 2410-2415
Author(s):  
Ya Feng Nie ◽  
Cai Hong Lu ◽  
Bo Liu ◽  
Xiu Wen Qu ◽  
Xiao Bo Bai
Keyword(s):  
Activated Sludge ◽  
Treatment Process ◽  
Sewage Treatment ◽  
Research Progress ◽  
Excess Sludge ◽  
Research Directions ◽  
Sewage Treatment Plants

The principle for the reduction of excess sludge by the ozone in the sewage treatment plants (STPs) was introduced and the change of characteristics of the ozonated sludge was analyzed in this paper. Furthermore, the effects of ozonation of activated sludge on the biotical treatment process in the STP were summarized. At last, the applications of this kind of technology in the worldwide range were enumerated and some further research directions were suggested.

Operation of a new sewage treatment process with technologies of excess sludge reduction and phosphorus recovery

2006 ◽  
Vol 53 (12) ◽  
pp. 217-227 ◽  
Author(s):  
W. Saktaywin ◽  
H. Tsuno ◽  
H. Nagare ◽  
T. Soyama
Keyword(s):  
Phosphorus Removal ◽  
Treatment Process ◽  
Sewage Treatment ◽  
Biomass Concentration ◽  
Phosphorus Recovery ◽  
Sludge Reduction ◽  
Excess Sludge ◽  
New Process ◽  
Crystallisation Process ◽  
Excess Sludge Reduction

This paper shows the potential application of a new sewage treatment process with technologies of excess sludge reduction and phosphorus recovery. The process incorporated ozonation for excess sludge reduction and crystallisation process for phosphorus recovery to a conventional anaerobic/oxic (A/O) phosphorus removal process. A lab-scale continuous operation experiment was conducted with the ratio of sludge flow rate to ozonation tank of 1.1% of sewage inflow under 30 to 40 mgO3/gSS of ozone consumption and with sludge wasting ratio of 0.34% (one-fifth of a conventional A/O process). Throughout the operational experiment, a 60% reduction of excess sludge production was achieved in the new process. A biomass concentration of 2,300 mg/L was maintained, and the accumulation of inactive biomass was not observed. The new process was estimated to give a phosphorus recovery degree of more than 70% as an advantage of excess sludge reduction. The slight increase in effluent COD was observed, but the process performance was maintained at a satisfactory level. These facts demonstrate an effectiveness of the new process for excess sludge reduction as well as for phosphorus recovery.

Waste activated sludge reduction using sonication and cryptic growth

2008 ◽  
Vol 10 (1) ◽  
pp. 64 ◽  
Author(s):  
Weiying Li ◽  
Guangming Zhang ◽  
Panyue Zhang ◽  
Huanzhi Liu
Keyword(s):  
Activated Sludge ◽  
Waste Activated Sludge ◽  
Sludge Reduction ◽  
Cryptic Growth
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