AI Article Synopsis
- Biofilters effectively convert hydrogen sulphide (H2S) to sulphate in wastewater treatment, requiring optimal moisture and pH.
- Large volumes of weakly acidic leachate are produced, but after 150 days, the biofilter can generate concentrated sulphuric acid (over 5.5 M) while eliminating H2S efficiently (95% removal).
- Genetic profiling indicates the upper biofilter sections are best for H2S conversion, suggesting potential for recovering usable sulfur from the process.
Article Abstract
Biofilters are used for the conversion of odorous hydrogen sulphide to odourless sulphate in wastewater treatment plants under the right conditions of moisture and pH. One of the consequences of maintaining the suitable pH and moisture content is the production of large volumes of weakly acidic leachate. This paper presents a biofilter with a maximum H2S elimination capacity of 16.3 g m(-3) h(-1) and removal efficiency greater than 95 % which produces small volumes (1 mL of solution L(-1) of reactor day(-1)) of sulphuric acid with a concentration greater than 5.5 M after 150 days of continuous operation. The concentrated sulphuric acid was produced by intermittently trickling a minimum amount of nutrient solution down the upflow biofilter which created a moisture and pH gradient within the biofilter resulting in an environment at the top for the bacterial conversion of H2S, while sulphuric acid was accumulated at the base. Genetic diversity profiling of samples taken from different sections of the biofilter confirms that the upper sections of the biofilter had the best environment for the bacteria to convert H2S to sulphate. The formation of concentrated sulphuric acid presents an opportunity for the recovery of sulphur from the waste stream as a usable product.
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| http://dx.doi.org/10.1007/s11356-016-6858-z | DOI Listing |
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