Treatment of a Landfill Leachate Containing Refractory Organics and Ammonium Nitrogen by the Microorganism-Attached Activated Carbon Fluidized Bed Process

1992 ◽  
Vol 26 (9-11) ◽  
pp. 1999-2002 ◽  
Author(s):  
N. Iwami ◽  
A. Imai ◽  
Y. Inamori ◽  
R. Sudo
Keyword(s):  
Activated Carbon ◽  
Mass Balance ◽  
Fluidized Bed ◽  
Landfill Leachate ◽  
Ammonium Nitrogen ◽  
High Concentration ◽  
Operation Period ◽  
Highly Effective ◽  
Fluidized Bed Process ◽  
Refractory Organics

The microorganism-attached activated carbon fluidized bed (MAACFB) process was applied to treat a landfill leachate containing refractory organics and a high concentration of ammonium nitrogen. The MAACFB process removed about 60 % and 70 % of refractory organics and nitrogen, respectively, from the landfill leachate simultaneously and steadily over a more than 700 days of operation period. A mass balance on organics around the MAACFB process revealed that more than 90 % of the removed organics may be biodegraded. It was suggested that the MAACFB process is highly effective in biodegrading the refractory organics in landfill leachate.

scholarly journals Effects of selection and compiling strategy of substrates in column-type vertical-flow constructed wetlands on the treatment of synthetic landfill leachate containing bisphenol A

2021 ◽  
Author(s):  
Rajani Ghaju Shrestha ◽  
Daisuke Inoue ◽  
Michihiko Ike
Keyword(s):  
Activated Carbon ◽  
Bisphenol A ◽  
Landfill Leachate ◽  
Low Cost ◽  
Oxygen Demand ◽  
Ammonium Nitrogen ◽  
Pollutant Removal ◽  
Vertical Flow ◽  
Batch Mode ◽  
Synthetic Leachate

Abstract A constructed wetland (CW) is a low-cost, eco-friendly, easy-to-maintain, and widely applicable technology for treating various pollutants in the waste landfill leachate. This study determined the effects of the selection and compiling strategy of substrates used in CWs on the treatment performance of a synthetic leachate containing bisphenol A (BPA) as a representative recalcitrant pollutant. We operated five types of lab-scale vertical-flow CWs using only gravel (CW1), a sandwich of gravel with activated carbon (CW2) or brick crumbs (CW3), and two-stage hybrid CWs using gravel in one column and activated carbon (CW4) or brick crumbs (CW5) in another to treat synthetic leachate containing BPA in a 7-d sequential batch mode for 5 weeks. CWs using activated carbon (CW2 and CW4) effectively removed ammonium nitrogen (NH4-N) (99–100%), chemical oxygen demand (COD) (93–100%), and BPA (100%), indicating that the high adsorption capacity of activated carbon was the main mechanism involved in their removal. CW5 also exhibited higher pollutant removal efficiencies (NH4-N: 94–99%, COD: 89–98%, BPA: 89–100%) than single-column CWs (CW1 and CW3) (NH4-N: 76–100%, COD: 84–100%, BPA: 51–100%). This indicates the importance of the compiling strategy along with the selection of an appropriate substrate to improve the pollutant removal capability of CWs.

A mass balance study on nitrification and deammonification in vertical flow constructed wetlands treating landfill leachate

2007 ◽  
Vol 56 (3) ◽  
pp. 117-123 ◽  
Author(s):  
G. Sun ◽  
D. Austin
Keyword(s):  
Mass Balance ◽  
Total Nitrogen ◽  
Landfill Leachate ◽  
Nitrogen Loss ◽  
Organic Content ◽  
Vertical Flow ◽  
Ammoniacal Nitrogen ◽  
High Concentration ◽  
Balance Study ◽  
Mass Balance Study

A laboratory-scale, mass-balance study was carried out on the transformation of nitrogenous pollutants in four vertical flow wetland columns. Landfill leachate containing low organic matter, but a high concentration of ammoniacal-nitrogen, was treated under dissolved oxygen concentrations close to saturation. Influent total nitrogen (TN) comprised ammoniacal-nitrogen with less than 1% nitrate and nitrite, negligible organic nitrogen, and very low BOD. Nitrification occurred in three of the four columns. There was a substantial loss of total nitrogen (52%) in one column, whereas other columns exhibited zero to minor losses (<12%). Nitrogen loss under study conditions was unexpected. Two hypotheses are proposed to account for it: (1) either the loss of TN is attributed to nitrogen transformation into a form (provisionally termed α-nitrogen) that is undetectable by the analytical methods used; or (2) the loss is caused by microbial denitrification or deammonification. By elimination and stoichiometric mass balance calculations, completely autotrophic nitrogen-removal over nitrite (CANON) deammonification is confirmed as responsible for nitrogen loss in one column. This result reveals that CANON can be native to aerobic engineered wetland systems treating high ammonia, low organic content wastewater.

Pilot Scale Evaluation of Pellet Fluidized Bed Process for the Conditioning of Alum Sludge

2013 ◽  
Vol 726-731 ◽  
pp. 530-534
Author(s):  
Gang Zhang ◽  
Li Qing Zhang
Keyword(s):  
Fluidized Bed ◽  
High Surface ◽  
Maximum Flow ◽  
Pilot Scale ◽  
High Concentration ◽  
Surface Loading ◽  
Water Treatment Process ◽  
Alum Sludge ◽  
Scale Experiment ◽  
Fluidized Bed Process

As a burgeoning technology based on conventional clarifier technology, pellet fluidized bed (PFB) technology has been widely applied in kinds of high SS water treatment process. In this paper, PFB process was used to thicken the alum sludge in a water plant in south China with scale of 1.0~2.5m3/h. The experimental results showed that, increasing flocculent (PAM) dosage could decrease outlet turbidity, and average up pellets settling behavior. Under the experimental condition, there exist negatively linear relationship between process maximum flow rate which ranged from 1.6m3/h to 2.2 m3/h and raw sludge concentration. Moreover, because of the improvement of pH environment and flocs chemical structure, additional lime dosage would enhance maximum surface loading and save PAM dosage. The pilot scale experiment proved that by applying PFB, alum sludge conditioning could achieve satisfied results characterised by high surface loading, low outlet turbidity, and high concentration thicken sludge with fine dewaterability.

The optimum medium of the suspended bio-medium aeration contactor process

1994 ◽  
Vol 29 (10-11) ◽  
pp. 183-188 ◽  
Author(s):  
C. F. Ouyang ◽  
C. M. Liaw
Keyword(s):  
Particle Size ◽  
Activated Carbon ◽  
Fluidized Bed ◽  
Shear Force ◽  
Biomass Concentration ◽  
Aeration Tank ◽  
High Biomass ◽  
The Media ◽  
Fluidized Bed Process ◽  
High Biomass Concentration

The purpose of this study is to modify the Fluidized Bed Process. Placing various particle diameters of granular activated carbon, (#20∼#30, #30∼#40, #40∼#50) as a medium in an aeration tank, in which microorganisms can attach and grow, improves the biomass concentration, volumetric loadings and removal efficiency. The continuous supply of substrates allows the thickness of bio-film on the medium to be shifted to a proper state. This is due to a friction force effect between the media and the shear force of the agitated flow. After studying the comparisons, it is concluded that the middle particle size (#30∼#40) is the best of the three particle diameters as a medium, in that it achieves a high biomass concentration, stable treatment and higher efficiency.

Removal of microcystin-LR from drinking water with TiO2-coated activated carbon

2004 ◽  
Vol 4 (5-6) ◽  
pp. 21-28
Author(s):  
S.-C. Kim ◽  
D.-K. Lee
Keyword(s):  
Drinking Water ◽  
Activated Carbon ◽  
Synergistic Effect ◽  
Fluidized Bed ◽  
Continuous Flow ◽  
High Surface ◽  
High Surface Area ◽  
Fluidized Bed Reactor ◽  
Exterior Surface ◽  
Tio2 Particles

TiO2-coated granular activated carbon was employed for the removal of toxic microcystin-LR from water. High surface area of the activated carbon provided sites for the adsorption of microcystin-LR, and the adsorbed microcystin-LR migrated continuously onto the surface of TiO2 particles which located mainly at the exterior surface in the vicinity of the entrances of the macropores of the activated carbon. The migrated microcystin-LR was finally degraded into nontoxic products and CO2 very quickly. These combined roles of the activated carbon and TiO2 showed a synergistic effect on the efficient degradation of toxic microcystin-LR. A continuous flow fluidized bed reactor with the TiO2-coated activated carbon could successfully be employed for the efficient photocatalytic of microcystin-LR.

Sign in / Sign up

Export Citation Format

Share Document