ABSTRACT

The purpose of this study is to clarify the mechanism of the coupled hydrion with biology polysulfide in the simultaneous denitrification and desulfurization process. The coupled hydrion with biology polysulfide, uncoupled hydrion with biology polysulfide and no polysulfide experiments were performed in wastewater with two kinds of sulfide loads (100 and 200 mg/L). When the concentration of thiosulfate was suitable, the free H⁺ concentration (74.2 and 91.0 mg/L) and the proportion of Thiobacillus denitrificans (85.4% and 59.7%) were both higher under the two kinds of sulfide loading conditions (100 and 200 mg/L), and coupled hydrion with biology polysulfide was realized (the production of elemental sulfur is as high as 33 and 101 mg/L). Further analysis shown that the way of coupled hydrion with biology polysulfide were both: $2.0{\mathrm{S}}^{2-}+6{.4\mathrm{NO}}_3^{-}+30.1{\mathrm{H}}^{+}+21.7{\mathrm{e}}^{-}\to 1.0{\mathrm{S}}^{2-}+1{.0\mathrm{SO}}_4^{2-}+3.2{\mathrm{N}}_2+15.0{\mathrm{H}}_2\mathrm{O}$. In addition, for the coupled hydrion with biology polysulfide, more nitrates could be utilized to produce elemental sulfur S⁰, and the lower ratio of H⁺/S⁰ and ${\mathrm{SO}}_4^{2-}/{\mathrm{S}}^0$ were observed (S^2- = 100 mg/L: 2.3 and 0.9; S^2- = 200 mg/L: 0.9 and 0.03), which could promote the growth of Thiobacillus denitrificans and increase the proportion of Thiobacillus denitrificans. This maybe one of the reasons why coupled hydrion with biology polysulfide could be achieved.

摘要

本研究旨在阐明氢离子与生物多硫化物偶联在同时脱氮脱硫过程中的机理。在两种硫化物负荷（100 和 200 mg/L）的废水中进行了偶联氢离子与生物多硫化物、非偶联氢离子与生物多硫化物和无多硫化物的实验。当硫代硫酸盐浓度合适时，游离H ^{+浓度（74.2和91.0 mg/L）和}脱氮硫杆菌的比例（85.4%和59.7%）在两种硫化物负载条件下（100和200 mg/L）均较高，实现了氢离子与生物多硫化物的偶联（单质硫产量分别高达33和101 mg/ L)。进一步分析表明，氢离子与生物多硫化物的偶联方式有：$2.0{\mathrm{小号}}^{2-}+6{.4\mathrm{不}}_3^{-}+30.1{\mathrm{H}}^{+}+21.7{\mathrm{e}}^{-}\to 1.0{\mathrm{小号}}^{2-}+1{.0\mathrm{所以}}_4^{2-}+3.2{\mathrm{ñ}}_2+15.0{\mathrm{H}}_2\mathrm{○}$. 此外，对于与生物多硫化物偶联的氢离子，可以利用更多的硝酸盐来生产元素硫S ⁰，并且H ⁺ /S ⁰和${\mathrm{所以}}_4^{2-}/{\mathrm{小号}}^0$观察到（S ^2-  = 100 mg/L：2.3和0.9；S ^2-  = 200 mg/L：0.9和0.03），可促进脱氮硫杆菌的生长，提高脱氮硫杆菌的比例。这可能是氢离子与生物多硫化物偶联的原因之一。