EFFECT OF EFFLUENT RECYCLE ON THE PERFORMANCE OF AN ANAEROBIC FILTER

Abstract Laboratory studies were conducted to demonstrate the effectiveness of diffused aeration for the removal of ammonia from the effluent of an anaerobic filter treating leachate. The effects of pH, temperature and air flow on the process were studied. The coefficient of desorption of ammonia, KD for the anaerobic filter effluent (TKN 75 mg/L with NH3-N 88%) was determined at pH values of 9, 10 and 11, temperatures of 10, 15, 20, 30 and 35°C, and air flow rates of 50, 120, and 190 cm3/sec/L. Results indicated that nitrogen removal from the effluent of anaerobic filters by ammonia desorption was feasible. Removals exceeding 90% were obtained with 8 hours aeration at pH of 10, a temperature of 20°C, and an air flow rate of 190 cm3/sec/L. Ammonia desorption coefficients, KD, determined at other temperatures and air flow rates can be used to predict ammonia removals under a wide range of operating conditions.

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Influence of Daily Variation of Flow and Pollution Load on the Performance of Submerged Anaerobic/Aerobic Biofilm System

Water Science & Technology ◽

10.2166/wst.1990.0196 ◽

1990 ◽

Vol 22 (3-4) ◽

pp. 153-160 ◽

Cited By ~ 2

Author(s):

T. Okubo ◽

M. Okada ◽

A. Murakami ◽

Y. Inamori

Keyword(s):

Organic Carbon ◽

Field Study ◽

Laboratory Study ◽

Hydraulic Retention Time ◽

Daily Variation ◽

Synthetic Wastewater ◽

Constant Flow ◽

Pollution Load ◽

Mean Values ◽

Anaerobic Filter

Effects of daily variation of flow on the performance of submerged anaerobic/aerobic biofilm systems were investigated both by laboratory study using synthetic wastewater and by field study using gray water. In laboratory study, concentration of dissolved organic carbon (DOC) in effluent from anaerobic filter fluctuated with daily variation of flow when average hydraulic retention time (HRT) was below 10 h. However, daily mean values of DOC under the varied flow was almost the same as those under constant flow within the same daily mean HRT. Aerobic filter linked to anaerobic filter reduced the concentration of DOC satisfactorily though the concentration in anaerobic filter increased under short HRT. In field study, percent removal of organic carbon by anaerobic filter was considerably smaller (20-30%) than that in laboratory study (90-95%) both at HRT of 20 h though it was improved up to 60-80% by aerobic filter. Effects of peaking factor of flow on the variation of DOC were evaluated by mathematical analysis. It seemed that the peaking factor hardly affected daily mean values of DOC within the same daily mean HRT though maximum values of DOC increased with the increase of peaking factor.

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Reductive transformation of tetrachloroethylene to ethylene and ethane by an anaerobic filter

Water Science & Technology ◽

10.2166/wst.1997.0583 ◽

1997 ◽

Vol 36 (6-7) ◽

pp. 125-132 ◽

Cited By ~ 3

Author(s):

Toshiya Komatsu ◽

Jun Shinmyo ◽

Kiyoshi Momonoi

Keyword(s):

Electron Donor ◽

Laboratory Scale ◽

Groundwater Contaminants ◽

Reductive Transformation ◽

Filter System ◽

Anaerobic Filter ◽

Anaerobic Microorganisms ◽

Chlorinated Ethylenes ◽

Start Up ◽

Low Concentrations

Tetrachloroethylene (PCE) is one of the most common groundwater contaminants in Japan. PCE can be completely dechlorinated to ethylene (ETY) and ethane (ETA) by anaerobic microorganisms in the presence of a suitable electron donor. This study was conducted to examine the feasibility of using an anaerobic filter for the degradation of PCE in a bioremediation process. Laboratory-scale anaerobic filters were operated at 25°C using ethanol as the electron donor. Rapid start-up of the reactors was achieved by using anaerobic completely PCE-dechlorinating enrichment cultures as the inoculum. During the continuous operating periods, low concentrations (2.8 mg/L) of PCE were almost completely dechlorinated to ETY and ETA at hydraulic retention times of 49-15 hours with 100 mgCOD/L of ethanol. PCE concentrations as high as 80 mg/L was dechlorinated to ETY with a relatively low supply (200 mgCOD/L) of ethanol. Results of this study suggest that the anaerobic filter system is a feasible bioremediation process for the cleanup of groundwater which is contaminated by chlorinated ethylenes.

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Anaerobic Degradation of Individual Components from 5-Hydroxymethylfurfural Process-Wastewater in Continuously Operated Fixed Bed Reactors

Processes ◽

10.3390/pr9040677 ◽

2021 ◽

Vol 9 (4) ◽

pp. 677

Author(s):

Muhammad Tahir Khan ◽

Johannes Krümpel ◽

Dominik Wüst ◽

Andreas Lemmer

Keyword(s):

Levulinic Acid ◽

Anaerobic Degradation ◽

Fixed Bed ◽

Methane Yield ◽

Process Stability ◽

Anaerobic Process ◽

Anaerobic Filter ◽

Fixed Bed Reactors ◽

Process Wastewater ◽

By Products

Production of bio-based materials in biorefineries is coupled with the generation of organic-rich process-wastewater that requires further management. Anaerobic technologies can be employed as a tool for the rectification of such hazardous by-products. Therefore, 5-hydroxymethylfurfural process-wastewater and its components were investigated for their biodegradability in a continuous anaerobic process. The test components included 5-hydroxymethylfurfural, furfural, levulinic acid, and the full process-wastewater. Each component was injected individually into a continuously operating anaerobic filter at a concentration of 0.5 gCOD. On the basis of large discrepancies within the replicates for each component, we classified their degradation into the categories of “delayed”, “retarded”, and “inhibitory”. Inhibitory represented the replicates for all the test components that hampered the process. For the retarded degradation, their mean methane yield per 0.5 gCOD was between 21.31 ± 13.04 mL and 28.98 ± 25.38 mL. Delayed digestion was considered adequate for further assessments in which the order of conversion to methane according to specific methane yield for each component from highest to lowest was as follows: levulinic acid > furfural > 5-hydroxymethylfurfural > process-wastewater. Disparities and inconsistencies in the degradation of process-wastewater and its components can compromise process stability as a whole. Hence, the provision of energy with such feedstock is questionable.

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Effects of wastewater strength on the performance of an anaerobic filter

Journal of Fermentation Technology ◽

10.1016/0385-6380(86)90080-4 ◽

1986 ◽

Vol 64 (6) ◽

pp. 545-551 ◽

Cited By ~ 2

Author(s):

Susumu Hashimoto ◽

Masanori Fujita ◽

Jishui Qu ◽

Ji Zhang ◽

Akira Yamazaki

Keyword(s):

Anaerobic Filter

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Pharmaceutical Waste Treatment by Anaerobic Filter

Journal of the Environmental Engineering Division ◽

10.1061/jeegav.0001287 ◽

1982 ◽

Vol 108 (2) ◽

pp. 297-314

Author(s):

Elliot F. Sachs ◽

J. Charles Jennett ◽

Myrton C. Rand

Keyword(s):

Waste Treatment ◽

Anaerobic Filter ◽

Pharmaceutical Waste

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Characterization, Digestibility and Anaerobic Treatment of Leachates from Old and Young Landfills

Water Science & Technology ◽

10.2166/wst.1989.0218 ◽

1989 ◽

Vol 21 (4-5) ◽

pp. 145-155 ◽

Cited By ~ 23

Author(s):

R. Méndez ◽

J. M. Lema ◽

R. Blázquez ◽

M. Pan ◽

C. Forjan

Keyword(s):

Anaerobic Digestion ◽

Anaerobic Treatment ◽

Full Scale ◽

Operating Conditions ◽

Organic Load ◽

Anaerobic Filter ◽

Standards Of Living ◽

Landfill Sites

We have evaluated the utility of applying anaerobic digestion treatment to the leachates from two landfill sites receiving solid urban refuse from populations of similar standards of living. Both tips are located in the same area and have very similar climates, but they differ as regards the length of time they have been operated. The leachates from the older tip have much lower levels of organic load, 40% of which was refractory to the anaerobic digestion treatment applied. The digestibility of leachates was studied by using a semicontinuous suspended sludge system.It was possible to remove up to 65% of the soluble COD of leachates from the young tip by means of an anaerobic filter working at HRTs less than 2 days. This system proved to be highly stable when its operating conditions were subjected to perturbations similar to those likely to be suffered by a full-scale plant.

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