New compact scrubber for odour removal in wastewater treatment plants

Abstract

This work presents the performances of a new odour scrubber. The reactor is packed with a new structure which enables co-current operations at high gas velocities. Energy consumption and removal efficiency of sulphur compounds by oxidative alkaline scrubbing were studied. The influence of both superficial gas (U(SG)) and liquid (U(SL)) velocities, ranging from 5.6 to 28 m.s(-1) and 0.016 to 0.055 m.s(-1) respectively, were quantified. Thus, the range of 0.5 to 5 liquid-to-gas mass ratio (L/G) was studied. A comparison has been made with a previous study on static mixers (SM) and with classical random packed towers (PT). It has been shown that superficial liquid and gas velocities have a significant influence on these parameters. Hydrogen sulphide (H2S) abatement reached values up to 99%. As concerns methylmercaptan (CH3SH), the maximal removal efficiency was 87%. As a result, if well scaled-up, our reactor can be a small single stage efficient apparatus for the elimination of low concentrations of sulphur compounds as H2S and CH3SH in high flow rates of polluted gas effluents.

Sewage Treatment Plants

“…Chemical scrubbing constitutes nowadays one of the most commonly implemented technologies in the odour control market due to its reasonably high performance, lower operating costs compared to other physical-chemical technologies and extensive experience in design and operation (Card, 2001;Sanchez et al 2006). Chemical scrubbing constitutes nowadays one of the most commonly implemented technologies in the odour control market due to its reasonably high performance, lower operating costs compared to other physical-chemical technologies and extensive experience in design and operation (Card, 2001;Sanchez et al 2006).…”

Removal of CH3SH with in‐situ generated ferrate(VI) in a wet‐scrubbing reactor

“…CH 3 SH absorption/oxidation in aqueous alkaline solution can be described by the following reactions: 27,38 At the gas-liquid interface:…”

“…Therefore, the contact time and pH of the scrubbing solution are two key parameters for odorants removal in this process. For example, in a compact scrubber with aqueous NaClO/NaOH washing solution, H 2 S with initial concentration of 10 ppm/v can achieve 99.5% removal at a residence time of 0.02 s, while CH 3 SH removal with initial concentration of 4 ppm/v was only 78% . In the photocatalytic wet scrubbing process, CH 3 SH absorption by the solution is a rate‐determining step at pH <11.5 .…”

A review on an electrochemically assisted-scrubbing process for environmental harmful pollutant's destruction

“…In general, the absorption of air or immiscible VOCs is higher at high flow rates [102][103][104]. The removal efficiency or absorption of isopropyl alcohol, acetone and ethyl acetate into a liquid was correlated with the flow rate by observing the difference in mass transfer coefficient and the Henry's constant [85,105].…”