AI Article Synopsis
- The study assessed how adding iron (specifically ferric chloride) to sewage sludge impacts anaerobic digestion and reduces odor-causing gases like hydrogen sulfide (H2S) and volatile organic sulfur compounds (VOSCs).
- Samples from various wastewater treatment plants were tested in batch anaerobic digestion setups, showing that iron content correlated with better solid removal and digestion performance over a 30-day period.
- The addition of 1.25% w/w ferric chloride significantly improved digestion outcomes and minimized odors in the resulting biosolids, indicating its effectiveness as an odor control strategy in wastewater treatment operations.
Article Abstract
The role of iron addition to sewage sludge prior to anaerobic digestion was evaluated to determine the effect of iron on digestion performance and generation of odor-causing compounds. Hydrogen sulfide (H2S) and volatile organic sulfur compounds (VOSCs) were the odorous gases evaluated in this study. Samples were obtained from seven municipal wastewater treatment plants (WWTPs), and batch anaerobic digestion tests were conducted using primary and secondary sludges at 30 day solids retention time (SRT) under mesophilic conditions. Volatile solid removal (VSR) was highly predictable with background iron concentrations measured in the combined sludge. They were likely to increase as influent iron content increased. 1.25% w/w ferric chloride (FeCl3) was added to the anaerobic digester feed in order to simulate iron addition for sulfide control in full-scale WWTPs. The results showed that it had a positive impact on digestion performance with higher VSR and odor control with reduced H2S and TVOSCs in the headspace gas of dewatered biosolids considered in the tests. Ferric chloride is considered a beneficial additive as a strategy for an odor mitigation, not to mention more efficient digestion under anaerobic conditions.
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| http://dx.doi.org/10.2166/wst.2013.507 | DOI Listing |
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