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Inhibition of hydrogen sulfide formation in a biogas reactor by means of iron compounds addition; Haemning af svovlbrintedannelse i biogasanlaeg ved tilsaetning af jernforbindelser

Technical Report:

Abstract

Addition of iron salts to a laboratory biogas reactor in order to educe hydrogen sulfide concentration in the gas phase has been tested. The effect of molar concentrations of iron (different counter-ions), of the hydraulic load and process temperature has been examined. Influence of iron compounds addition upon the bacterial flora composition (methane producing and sulfate reducing) as well the rate of sulfate reduction have been tested. Results were compared with data from the operating full-scale biogas plants in Denmark. Laboratory experiments proved the addition of iron sulfate to have no effect on the hydrogen sulfide level in gaseous phase, quite as expected. Addition of iron chlorides so, as to achieve a molar ratio iron/sulfide in the bioreactor to be 1:1, or surplus iron/sulfide, resulted generally in a reduction of H{sub 2}S concentration in the gas by 60-80 % compared to untreated controls. However further increasing concentrations of iron chloride did not further reduce the H{sub 2}S concentration in the produced biogas beyond 80 %. No measurable difference was observed while using Fe{sup 2+} instead of Fe{sup 3+} salts. The effect was independent on the reactor temperature as well, and followed similar patterns in the mesophilic and thermophilic bioreactors. Iron  More>>
Authors:
Publication Date:
Nov 01, 1993
Product Type:
Technical Report
Report Number:
NEI-DK-1748
Reference Number:
SCA: 090900; PA: DK-94:001744; EDB-95:013046; SN: 95001301494
Resource Relation:
Other Information: DN: EFP-92; PBD: Nov 1993
Subject:
09 BIOMASS FUELS; IRON COMPOUNDS; METHANE; CLEANING; SULFATES; ANAEROBIC DIGESTION; HYDROGEN SULFIDES; PH VALUE; BIOREACTORS; TEMPERATURE DEPENDENCE; BIOMASS CONVERSION PLANTS; 090900; PROCESSING
OSTI ID:
10105212
Research Organizations:
Dansk Teknologisk Inst., Taastrup (Denmark)
Country of Origin:
Denmark
Language:
Danish
Other Identifying Numbers:
Other: ON: DE95723848; CNN: Contract ENS-1383/92-0001; TRN: DK9401744
Availability:
OSTI; NTIS
Submitting Site:
DK
Size:
56 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Lund, B. Inhibition of hydrogen sulfide formation in a biogas reactor by means of iron compounds addition; Haemning af svovlbrintedannelse i biogasanlaeg ved tilsaetning af jernforbindelser. Denmark: N. p., 1993. Web.
Lund, B. Inhibition of hydrogen sulfide formation in a biogas reactor by means of iron compounds addition; Haemning af svovlbrintedannelse i biogasanlaeg ved tilsaetning af jernforbindelser. Denmark.
Lund, B. 1993. "Inhibition of hydrogen sulfide formation in a biogas reactor by means of iron compounds addition; Haemning af svovlbrintedannelse i biogasanlaeg ved tilsaetning af jernforbindelser." Denmark.
@misc{etde_10105212,
title = {Inhibition of hydrogen sulfide formation in a biogas reactor by means of iron compounds addition; Haemning af svovlbrintedannelse i biogasanlaeg ved tilsaetning af jernforbindelser}
author = {Lund, B}
abstractNote = {Addition of iron salts to a laboratory biogas reactor in order to educe hydrogen sulfide concentration in the gas phase has been tested. The effect of molar concentrations of iron (different counter-ions), of the hydraulic load and process temperature has been examined. Influence of iron compounds addition upon the bacterial flora composition (methane producing and sulfate reducing) as well the rate of sulfate reduction have been tested. Results were compared with data from the operating full-scale biogas plants in Denmark. Laboratory experiments proved the addition of iron sulfate to have no effect on the hydrogen sulfide level in gaseous phase, quite as expected. Addition of iron chlorides so, as to achieve a molar ratio iron/sulfide in the bioreactor to be 1:1, or surplus iron/sulfide, resulted generally in a reduction of H{sub 2}S concentration in the gas by 60-80 % compared to untreated controls. However further increasing concentrations of iron chloride did not further reduce the H{sub 2}S concentration in the produced biogas beyond 80 %. No measurable difference was observed while using Fe{sup 2+} instead of Fe{sup 3+} salts. The effect was independent on the reactor temperature as well, and followed similar patterns in the mesophilic and thermophilic bioreactors. Iron salts have different effect depending on the start concentration and hydraulic load. At high initial concentration > 2500 ppm H{sub 2}S and short retention time (15 days), higher concentrations of iron ions (molar Fe/S ratio 4:1 is more effective than 2:1) were found necessary in order to achieve less than 700 ppm H{sub 2}S in the gaseous phase. (EG)}
place = {Denmark}
year = {1993}
month = {Nov}
}