Kinetics for Sulfate Removal in Tannery Wastewater by Immobilized Activated Sludge

2011 ◽  
Vol 356-360 ◽  
pp. 1135-1138
Author(s):  
Chang Qing Zhao ◽  
Qin Huan Yang ◽  
Wu Yong Chen
Keyword(s):  
Activated Carbon ◽  
Activated Sludge ◽  
Granular Activated Carbon ◽  
Reduction Product ◽  
Dynamic Equations ◽  
Tannery Wastewater ◽  
Anaerobic Sludge ◽  
Sulfate Removal ◽  
Aerobic Sludge

The anaerobic activated sludge inoculated with an isolated SRB was immobilized on the granular activated carbon and the kinetics for the immobilized anaerobic sludge treating the sulfate in tannery wastewater was studied. Also, the aerobic activated sludge containing enriched SOB was immobilized and the kinetics for the sulfur conversion was studied with the immobilized aerobic sludge through treating sulfide (the reduction product of SO42-) in tannery wastewater. The results showed that the kinetics for treating SO42-with the immobilized SRB in the actual tannery wastewater could be expressed as follows: lnC =-0.04941 t+6.79764. The kinetics for the sulfur conversion with the immobilized SOB through treating the sulfide in the actual tannery wastewater could be expressed as follows: lnC =0.01109 t+3.09996. The established dynamic equations could predict the capacity of sulfate removal and sulfur conversion in tannery wastewater.

A Performance Study of Aerobic Sludge Digestion

1973 ◽  
Vol 8 (1) ◽  
pp. 26-35
Author(s):  
K.S. Hogg ◽  
J. Ganczarczyk
Keyword(s):  
Activated Sludge ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Climatic Conditions ◽  
Anaerobic Sludge ◽  
Process Conditions ◽  
Performance Study ◽  
Digested Sludge ◽  
Sludge Digestion ◽  
Aerobic Sludge

Abstract The aerobic sludge digestion system at the sewage treatment plant at Dunnville, Ontario was designed as a one-stage aeration process (by means of the Inka system) of moderately concentrated excess activated sludge (less than 1 percent of TS), followed by continuous sludge thickening and sludge drying lagoons for the final dewatering of the digestion product. An evaluation of this system was conducted in the summer of 1972. It included the study of sludge and supernatant characteristics, phosphorus balance and an economical comparison of the costs associated with this type of aerobic digestion and anaerobic sludge digestion for similar size (about 1.7 IMGD) activated sludge process plants. Results of the investigations disclosed that the aerobic digester with sludge loading of about 0.03 lb VS/cu ft/day and an average hydraulic detention time of only 9.2 days, operated satisfactorily at the summer climatic conditions of Southern Ontario. This process, however, could not be judged on the basis of volatile solids reduction, which proved to be only equal to 6 percent. This phenomenon was probably due to the solubility in water of a part of the mineral constituents of the sludge under the process conditions. The change in the sludge specific oxygen uptake rates from 8.9 to 2.75 mg 02/gVSS/hr at 25°C, was a more reliable indicator of the digested sludge characteristics. Supernatant quality (average COD of 170 mg/l and SS of 110 mg/l) and the dewaterability of the digested sludge (average resistance to filtration equal to 0.86 x 1013 m/kg) provided additional information of the digester’s performance.

scholarly journals Biotransformation of congo red in a UASB reactor under salinity conditions using immobilized redox mediator in granular activated carbon

2021 ◽  
Vol 6 (4) ◽  
pp. 17-34
Author(s):  
Glenda A. Espinoza ◽  
◽  
Verónica Almaguer-Cantú ◽  
Refugio B. García-Reyes ◽  
Edna R. Meza ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Congo Red ◽  
Granular Activated Carbon ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Substrate Consumption ◽  
Biotransformation Process ◽  
Decolorization Efficiency ◽  
Salinity Levels ◽  
Anaerobic Sludge Blanket

Azo dyes are susceptible to be treated by reductive biotransformation process under anaerobic conditions. The process can be accelerated by the addition of quinones and humic substances acting as redox mediators (RM). In this study, the anthraquinone-2-sulfonate (AQS) was immobilized on granular activated carbon (GAC) to evaluate the reductive biotransformation of congo red (CR) in an up-flow anaerobic sludge blanket reactor (UASB). The syudy was divided in five stages, where the reactors with immobilized RM and without RM were operated under different salinity levels (1% and 3%) and hydraulic retention times (HRT = 5 and 10 h). The reactor with immobilized RM (GAC-AQS) achieved a decolorization efficiency of 96.1% and substrate consumption of 98.8% with a HRT = 15 h and 1% of salinity. Nonetheless, with a salinity of 3% and the same HRT, the efficiency was similar (95.6%). The reactor provided with unmodified GAC achieved values below those observed in the reactor GAC-AQS, with decolorization efficiencies of 90.8% and 75.8%, and substrate consumption of 97.1% and 88.4%, for the stages IV and V, respectively. The microbial consortium sued was able to promote the biotransformation of azo dye and no inhibitory effects were identified.

Roles of magnetite and granular activated carbon in improvement of anaerobic sludge digestion

2018 ◽  
Vol 249 ◽  
pp. 666-672 ◽  
Author(s):  
Hong Peng ◽  
Yaobin Zhang ◽  
Dongmei Tan ◽  
Zhiqiang Zhao ◽  
Huimin Zhao ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Granular Activated Carbon ◽  
Anaerobic Sludge ◽  
Sludge Digestion ◽  
Anaerobic Sludge Digestion
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