SULFIDE TOXICITY IN ANAEROBIC SYSTEMS FED SULFATE AND VARIOUS ORGANICS

Citation
Ky. Maillacheruvu et al., SULFIDE TOXICITY IN ANAEROBIC SYSTEMS FED SULFATE AND VARIOUS ORGANICS, Water environment research, 65(2), 1993, pp. 100-109
Citations number
27
Categorie Soggetti
Limnology,"Environmental Sciences","Water Resources
Journal title
ISSN journal
10614303
Volume
65
Issue
2
Year of publication
1993
Pages
100 - 109
Database
ISI
SICI code
1061-4303(1993)65:2<100:STIASF>2.0.ZU;2-P
Abstract
Upflow anaerobic filters fed acetate and propionate, and completely mi xed, suspended growth reactors fed acetate, propionate, lactate, and g lucose were used to investigate the effect of electron donor and react or type on the interaction between sulfate-reducing bacteria (SRB) and methanogens. Organic loading rates of 0.25-0.50 g chemical oxygen dem and (COD)/L.d were used in suspended growth systems and 1.0-5.0 g COD/ L.d in filters. COD/sulfur ratios ranged from 20/1 to 2/1 for complete ly mixed reactors, and 20/1 to 8/1 for anaerobic filters. Results indi cated that organisms involved in the conversion of lactate and glucose into simpler products were not affected by sulfide toxicity. Levels o f 60-75 mg sulfur/L of hydrogen sulfide and 150-200 mg/L of dissolved sulfide (DS) caused stress in all suspended growth reactors; 100-150 m g sulfur/L of hydrogen sulfide and 200-400 mg DS/L could be tolerated in lactate and glucose systems, although with diminished COD and sulfa te removal. For similar loading conditions, lactate and glucose system s had higher DS levels than acetate and propionate systems. A cyclic p attern of variation of DS and hydrogen sulfide with volatile-acids COD (VACOD) was observed in long-term experiments with suspended growth r eactors. Anaerobic filters were able to tolerate higher DS and hydroge n sulfide levels than suspended growth reactors. A propionate-fed filt er could withstand more than 150 mg hydrogen sulfide/L of hydrogen sul fide and 1000 mg DS/L, and an acetate-fed filter could tolerate more t han 125 mg sulfur/L of hydrogen sulfide and 400 mg DS/L.