Staging of anaerobic processes for reduction of chronologically high concentrations of propionic acid.

The objective of this research was the reduction of chronic elevated propionate from a bench-scale, anaerobic completely stirred tank reactor (CSTR) without biomass recycle treating synthetic molasses wastewater. Pretreatment and posttreatment alternatives were specifically examined using a high-food-to-microorganism (F/M) con tact chamber as the preliminary operation unit in one case and an upflow anaerobic sludge blanket (UASB) reactor as the posttreatment unit in the second case. The high-F/M contact reactor unit, operated before the main reactor, was a two-stage (not a two-phase) configuration. After the feed contacted biomass that was recycled from the main reactor for a period of 1 day in a high-F/M contact reactor, the entire contents of the high-F/M contact reactor were transferred back to the main reactor. This brief contact operation resulted in a dramatic decrease in propionate concentrations in the effluent of the main reactor, which had been producing consistently high concentrations for approximately 4 months. After incorporation of the high-F/M contact reactor in the preliminary treatment step, the propionic acid concentration dropped significantly, from 1 050 mg/L to 300 mg/L. The results of this investiga tion showed that the contact time and F/M ratio in the high-F/M reactor were critical parameters in determining the efficacy of the two-stage configuration. In the second part of the study, the effluent from the main reactor (not incorporating a precontact reactor) was subjected to posttreatment by a UASB reactor filled with granular biomass. After an acclimation period of approximately 1 month, which provided a hydraulic retention time of 1 day in the UASB unit, the concentration of approximately 1 050 mg/L of propionic acid in the main reactor effluent fell to less than the quantification limit of 20 mg/L in the effluent of the UASB posttreatment unit. The overall success of both portions of the study seem to demonstrate the inappropriateness of using a one-stage CSTR process configuration for anaerobic metabolism of propionate derived from carbohydrate wastewaters.

Main Author: Duran, Metin.
Other Authors: Speece, R.
Language: English
Published: 1998
Online Access: http://ezproxy.villanova.edu/login?url=https://digital.library.villanova.edu/Item/vudl:175954
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dc_source_str_mv Water Environment Research 70(2), March-April 1998, 241-248.
author Duran, Metin.
author_s Duran, Metin.
spellingShingle Duran, Metin.
Staging of anaerobic processes for reduction of chronologically high concentrations of propionic acid.
author-letter Duran, Metin.
author_sort_str Duran, Metin.
author2 Speece, R.
author2Str Speece, R.
dc_title_str Staging of anaerobic processes for reduction of chronologically high concentrations of propionic acid.
title Staging of anaerobic processes for reduction of chronologically high concentrations of propionic acid.
title_short Staging of anaerobic processes for reduction of chronologically high concentrations of propionic acid.
title_full Staging of anaerobic processes for reduction of chronologically high concentrations of propionic acid.
title_fullStr Staging of anaerobic processes for reduction of chronologically high concentrations of propionic acid.
title_full_unstemmed Staging of anaerobic processes for reduction of chronologically high concentrations of propionic acid.
collection_title_sort_str staging of anaerobic processes for reduction of chronologically high concentrations of propionic acid.
title_sort staging of anaerobic processes for reduction of chronologically high concentrations of propionic acid.
description The objective of this research was the reduction of chronic elevated propionate from a bench-scale, anaerobic completely stirred tank reactor (CSTR) without biomass recycle treating synthetic molasses wastewater. Pretreatment and posttreatment alternatives were specifically examined using a high-food-to-microorganism (F/M) con tact chamber as the preliminary operation unit in one case and an upflow anaerobic sludge blanket (UASB) reactor as the posttreatment unit in the second case. The high-F/M contact reactor unit, operated before the main reactor, was a two-stage (not a two-phase) configuration. After the feed contacted biomass that was recycled from the main reactor for a period of 1 day in a high-F/M contact reactor, the entire contents of the high-F/M contact reactor were transferred back to the main reactor. This brief contact operation resulted in a dramatic decrease in propionate concentrations in the effluent of the main reactor, which had been producing consistently high concentrations for approximately 4 months. After incorporation of the high-F/M contact reactor in the preliminary treatment step, the propionic acid concentration dropped significantly, from 1 050 mg/L to 300 mg/L. The results of this investiga tion showed that the contact time and F/M ratio in the high-F/M reactor were critical parameters in determining the efficacy of the two-stage configuration. In the second part of the study, the effluent from the main reactor (not incorporating a precontact reactor) was subjected to posttreatment by a UASB reactor filled with granular biomass. After an acclimation period of approximately 1 month, which provided a hydraulic retention time of 1 day in the UASB unit, the concentration of approximately 1 050 mg/L of propionic acid in the main reactor effluent fell to less than the quantification limit of 20 mg/L in the effluent of the UASB posttreatment unit. The overall success of both portions of the study seem to demonstrate the inappropriateness of using a one-stage CSTR process configuration for anaerobic metabolism of propionate derived from carbohydrate wastewaters.
publishDate 1998
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dc.title Staging of anaerobic processes for reduction of chronologically high concentrations of propionic acid.
dc.creator Duran, Metin.
Speece, R.
dc.description The objective of this research was the reduction of chronic elevated propionate from a bench-scale, anaerobic completely stirred tank reactor (CSTR) without biomass recycle treating synthetic molasses wastewater. Pretreatment and posttreatment alternatives were specifically examined using a high-food-to-microorganism (F/M) con tact chamber as the preliminary operation unit in one case and an upflow anaerobic sludge blanket (UASB) reactor as the posttreatment unit in the second case. The high-F/M contact reactor unit, operated before the main reactor, was a two-stage (not a two-phase) configuration. After the feed contacted biomass that was recycled from the main reactor for a period of 1 day in a high-F/M contact reactor, the entire contents of the high-F/M contact reactor were transferred back to the main reactor. This brief contact operation resulted in a dramatic decrease in propionate concentrations in the effluent of the main reactor, which had been producing consistently high concentrations for approximately 4 months. After incorporation of the high-F/M contact reactor in the preliminary treatment step, the propionic acid concentration dropped significantly, from 1 050 mg/L to 300 mg/L. The results of this investiga tion showed that the contact time and F/M ratio in the high-F/M reactor were critical parameters in determining the efficacy of the two-stage configuration. In the second part of the study, the effluent from the main reactor (not incorporating a precontact reactor) was subjected to posttreatment by a UASB reactor filled with granular biomass. After an acclimation period of approximately 1 month, which provided a hydraulic retention time of 1 day in the UASB unit, the concentration of approximately 1 050 mg/L of propionic acid in the main reactor effluent fell to less than the quantification limit of 20 mg/L in the effluent of the UASB posttreatment unit. The overall success of both portions of the study seem to demonstrate the inappropriateness of using a one-stage CSTR process configuration for anaerobic metabolism of propionate derived from carbohydrate wastewaters.
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