scholarly journals Enhancing the removal of hazardous pollutants from coke-making wastewater by dosing activated carbon to a pilot-scale activated sludge process

2017 ◽  
Vol 92 (9) ◽  
pp. 2325-2333 ◽  
Author(s):  
Eleanor Raper ◽  
Ana Soares ◽  
Jane Chen ◽  
Adam Sutcliffe ◽  
Eric Aries ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Activated Sludge ◽  
Pilot Scale ◽  
Activated Sludge Process ◽  
Hazardous Pollutants

ADVANCED TREATMENT OF PAPER MILL EFFLUENTS BY A TWO-STAGE ACTIVATED SLUDGE PROCESS

1994 ◽  
Vol 30 (3) ◽  
pp. 173-181 ◽  
Author(s):  
L. Knudsen ◽  
J. A. Pedersen ◽  
J. Munck
Keyword(s):  
Activated Sludge ◽  
Treatment Plant ◽  
Paper Mill ◽  
Pilot Scale ◽  
Activated Sludge Process ◽  
Two Stage ◽  
Paper Mills ◽  
Paper Mill Effluents ◽  
Scale Test ◽  
Oxygen Requirements

The work presented in this paper concerns the application of a two-stage aerobic activated sludge process for treatment of effluents from paper mills in Denmark. The paper describes both pilot-scale test results and fullscale experience with the process. The treatment process is characterised by a bigh-load first stage (2-4 kg COD/kg MLSSxd) followed by a low-load second stage to secure full nitrification and denitrification of remaining nitrogen compounds. The results of continuous pilot-scale tests show that it is possible to obtain a reduction of more than 85% of the incoming COD,01 and a 99% reduction of the incoming BOD5, resulting in an effluent quality of 230 mg CODsol/l and less than 10 mg BOD5/l. As indicated, practically all the biodegradable organic substances are removed by the process. The remaining fraction of soluble organics measured as COD is considered to be non-biodegradable by conventional biological treatment systems. The results produced in the pilot-scale tests are confirmed by the effluent qualities obtained in a full-scale treatment plant at another paper mill, involving an identical process concept. During the pilot-scale tests, special attention bas been paid to the removal of organic compounds, organic nitrogen as well as nutrients and nitrification. In addition, the sludge characteristics and the oxygen requirements have been considered.

Dimensioning of Aerated Grit Chambers and Use as a Highly Loaded Activated Sludge Process

1989 ◽  
Vol 21 (4-5) ◽  
pp. 13-22
Author(s):  
Jorg Londong
Keyword(s):  
Activated Sludge ◽  
Pilot Scale ◽  
Air Injection ◽  
Activated Sludge Process ◽  
Cross Section Area ◽  
Section Area ◽  
Degree Of Separation ◽  
Highly Loaded ◽  
Adsorption Stage

The aerated grit chamber has long been used to separate sand from sewage. Nevertheless, there are no definite and uniform recommendations for dimensioning, and there is little information in the literature about the degree of separation attainable. Thus, principles for dimensioning and the possible degree of separation are derived from measurements of large pilot scale plants, two-dimensional models, and existing aerated grit chambers. The following values for dimensioning were found in this work: a detention period of about 20 minutes; a width to depth ratio (w/d) of about 0.8; a minimal and maximal cross section area between 1 and about 7 m2; a flow velocity of 20 cm/s at the bottom of the aerated grit chamber. Simple formulae for the determination of the required amount of air can be given in relation to the w/d ratio, the depth of air injection and the kind of aeration used (fine or coarse bubble). The simultaneous use of an aerated grit chamber as an adsorption stage (highly loaded activated sludge process) is possible without additional air being required to maintain the velocity at the bottom of the grit chamber. For purely aerobic operation, however, the amount of air has to be increased.

The Performance of Microelectrolysis in Improving the Biodegradability Landfill Leachate

2013 ◽  
Vol 448-453 ◽  
pp. 1399-1402 ◽  
Author(s):  
Ling Zhao ◽  
Xiao Gu Cheng ◽  
Ping He Yin ◽  
Gang Lu ◽  
Jun Chang Suo
Keyword(s):  
Activated Carbon ◽  
Reaction Time ◽  
Activated Sludge ◽  
Landfill Leachate ◽  
Biological Treatment ◽  
Activated Sludge Process ◽  
Mass Ratio ◽  
Operational Conditions ◽  
A Value ◽  
Mature Landfill Leachate

The aim of this study was to check the effectiveness of microelectrolysis for the pretreatment of a municipal landfill leachate with the objective improving its overall biodegradability, evaluated in terms of BOD5/COD ratio, up to a value compatible with biological treatment. The best microelectrolysis operational conditions for achieving the desired COD values were: pH=2.0; granular activated carbon (GAC) =10 g/L; mass ratio of zero iron (Fe0)/GAC=2:1; reaction time=90 min. The BOD5/COD was significantly improved from 0.12 to 0.31, which allowed an almost 85% removal of COD by a sequential activated sludge process. The results show that the microelectrolysis is a promising technology to improve the biodegradability of mature landfill leachate.

Effect of Fuzzy Control on Influent Variations in a Pilot-Scale Activated Sludge Process

1998 ◽  
Vol 31 (8) ◽  
pp. 509-514 ◽  
Author(s):  
Keisuke Iwahori ◽  
Koichiro Yamakawa ◽  
Masanori Fujita
Keyword(s):  
Fuzzy Control ◽  
Activated Sludge ◽  
Pilot Scale ◽  
Activated Sludge Process

Kinetic Model of Sequencing Batch Activated Sludge Process for Municipal Wastewater Treatment

1991 ◽  
Vol 23 (4-6) ◽  
pp. 1097-1106 ◽  
Author(s):  
H. Nakazawa ◽  
K. Tanaka
Keyword(s):  
Wastewater Treatment ◽  
Kinetic Model ◽  
Activated Sludge ◽  
Mathematical Models ◽  
Municipal Wastewater ◽  
Pilot Scale ◽  
Activated Sludge Process ◽  
Municipal Wastewater Treatment ◽  
Operational Conditions ◽  
Aeration Time

Mathematical models based on the kinetic aspect of the sequencing batch activated sludge process were developed to explain the characteristics of the process treating municipal wastewater. These models are a steady-state model dealing with the overall relationship between biomass concentrations in a reactor and operational conditions of the process, and a kinetic model dealing with the behaviors of biomass and substrate in a reactor within one cycle time of the process. Applying these mathematical models for the results of pilot-scale experiments for municipal wastewater treatment, reasonable parameters' values were obtained and the effects of operating strategies including the aeration time ratio and the solids retention time became clear for the process performance.

The sorption capacity of long-time aerated activated sludge demonstrated with 2,6-dimethylphenol

1999 ◽  
Vol 39 (8) ◽  
pp. 131-138 ◽  
Author(s):  
H. Gulyas ◽  
U. Heldt ◽  
I. Sekoulov
Keyword(s):  
Activated Carbon ◽  
Activated Sludge ◽  
Specific Surface ◽  
Sorption Capacity ◽  
Municipal Wastewater ◽  
Solid Phase ◽  
Tap Water ◽  
Treatment Plant ◽  
Pilot Scale ◽  
Hazardous Substance

The aim of this study was to evaluate the influence of the duration of activated sludge aeration on sorption capacity of the sludge for the hazardous substance 2,6-dimethylphenol (DMP). DMP was not degraded by normal activated sludge of a pilot scale treatment plant for municipal wastewater as shown by BOD measurements. Sludge aeration was performed for up to 50 days. In sorption assays the mixed liquor suspensions aerated for different times were added to solutions of DMP (10 to 50 mg/l) in tap water in order to give biomass concentrations of 1 g MLSS/l in the sorption assay. Also a sorption isotherm with different concentrations of activated sludge aerated for 50 days with a constant initial DMP concentration was recorded. In the experiments solid phase DMP concentrations of up to 20.9 mg DMP/g MLSS were found depending on aeration time of the activated sludge. Sorption equilibria were reached within short periods (about 10 min). DMP sorption capacity of activated sludge reached a maximum on the 43rd day of aeration and decreased afterwards. But the sorption capacity of sludge aerated for 43 days was significantly lower (about 40% removal of DMP at 1 g MLSS/l from an aqueous solution containing about 50 mg DMP/l) than the adsorption capacity of activated carbon (100% removal of DMP at 1 g activated carbon/l). On the other hand, activated sludge which had been aerated for an optimum period represents a rather good and cheap sorbent for the refractory DMP, considering the low specific surface of activated sludge compared to the specific surface of activated carbon. However, an appropriate method for removal of the sludge loaded with DMP has to be chosen in order to protect the environment against spreading of the hazardous compound DMP. A multistage biosorption process for DMP removal from industrial wastewater is suggested.

Effectiveness of the membrane bioreactor in the biodegradation of high molecular-weight compounds

1996 ◽  
Vol 34 (9) ◽  
pp. 197-203 ◽  
Author(s):  
H. Winnen ◽  
M. T. Suidan ◽  
P. V. Scarpino ◽  
B. Wrenn ◽  
N. Cicek ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Membrane Bioreactor ◽  
Municipal Wastewater ◽  
Extended Period ◽  
Membrane System ◽  
Pilot Scale ◽  
Synthetic Wastewater ◽  
Activated Sludge Process ◽  
Conventional Activated Sludge ◽  
Heterotrophic Microorganisms

The activated sludge process has been used extensively to treat municipal wastewater. The membrane bioreactor (MBR) process is a modification of the conventional activated sludge process where the clarifier is replaced with a membrane system for separation between the mixed liquor and the effluent. This paper presents the biological and physical performance data of a pilot-scale membrane bioreactor system, fed with a synthetic wastewater. At steady state, particularly high effluent quality was obtained and maintained for an extended period of time. Heterotrophic plate counting showed that the membrane retains heterotrophic microorganisms. Bacteriophage MS-2 was used to determine the retention of viruses. The membrane proved to retain the MS-2 virus.

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