Beneficial co-treatment of simple wet flue gas desulphurization wastes with freshwater sewage through development of mixed denitrification–SANI process

Investigation on thiosulfate-involved organics and nitrogen removal by a sulfur cycle-based biological wastewater treatment process

“…However, no in-depth investigations on the thiosulfate biological disproportionation in wastewater treatment have been found up to date. Moreover, we also actually found concerted accumulation of thiosulfate and sulfide (1:1 mg S/mg S) in a SO 4 2À /SO 3 2À -reducing reactor with organics added and completely utilized for chemolithotrophic denitrification in a thiosulfate-oxidizing reactor with nitrate dosed (Qian et al, 2015).…”

“…two autotrophic denitrification reactions driven by sulfide and thiosulfate respectively and one heterotrophic denitrification by organics when 30 mg N/L NaNO 3 was added to this anoxic reactor as the nitrate source. The setup achieved 80% COD removal and almost 100% nitrate removal under the steady-state condition when the sludge production was also in steady-state with a total sludge yield of 0.03 g VSS/g COD in the system (Qian et al, 2015).…”

“…Moreover, to reflect the pH in typical domestic wastewater treatment, also normally varied from 7.0 to 8.0, a pH range of 6.5e8.5 was selected in the four batch reactors in this Batch Test (see Table 1). An appropriate portion of the synthetic wastewater stock solution with Na 2 SO 4 (230 mg S/L) and Na 2 SO 3 (115 mg S/L) solutions was added together into each reactor to set its initial COD at about 420 mg/L and the molar ratio of SO Jiang et al, 2013) or its mixture with sulfate (Qian et al, 2015) and be further reduced to sulfide in BSR and disproportionated to sulfide and sulfate (Sass and Cypionka, 2004;Saafield and Bostick, 2009 (15) a The conc. unit is mg COD/L.…”

Modification of Y‐Zeolite with Zirconium for Enhancing the Active Component Loading: Preparation and Sulfate Adsorption Performance of ZrO(OH)2/Y‐Zeolite

“…As a result, the efficiency of sulfate removal by adding Ca 2+ is not high, at the same time, Ca 2+ in salt brine is an another impurity in chlor‐alkali industry. As for the biological treatment method, it may convert the sulfate to sulfide which is more toxic and also requires strict environmental conditions . As to membrane separation, it is highly costly and has a low efficiency when the concentration of sulfate is high …”

Biological Nitrogen Removal through Nitritation Coupled with Thiosulfate-Driven Denitritation

“…Sulfate and thiosulfate were detected by ion chromatography (IC). Sulfite concentration was obtained by titration as detailed in Qian et al 15. pH and temperature were monitored using a multi-meter electrode during each test (WTW multi 3420).…”