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Effects of sulfide on mixotrophic denitrification by Thauera-dominated denitrifying sludge
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2020-03-09 , DOI: 10.1039/c9ew01014a Zhensheng Liang 1, 2, 3, 4, 5 , Jianliang Sun 1, 2, 3, 4, 5 , Chungeng Zhan 1, 2, 3, 4, 5 , Siting Wu 1, 2, 3, 4, 5 , Liang Zhang 6, 7, 8, 9, 10 , Feng Jiang 4, 5, 11, 12
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2020-03-09 , DOI: 10.1039/c9ew01014a Zhensheng Liang 1, 2, 3, 4, 5 , Jianliang Sun 1, 2, 3, 4, 5 , Chungeng Zhan 1, 2, 3, 4, 5 , Siting Wu 1, 2, 3, 4, 5 , Liang Zhang 6, 7, 8, 9, 10 , Feng Jiang 4, 5, 11, 12
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Sulfide can be used as a complementary electron donor to enhance the denitrification efficiency when organic carbon is insufficient to reduce nitrate. However, sulfide is toxic to denitrifiers and may significantly reduce the denitrification efficiency. In this study, Thauera, well-known facultative denitrifiers, were successfully enriched in denitrifying sludge that was adapted to sulfide. The effects of sulfide on heterotrophic and autotrophic denitrification (mixotrophic denitrification) by the Thauera-dominated denitrifying sludge were investigated. The sludge was tolerant to the sulfide effects, and performed stably in mixotrophic nitrate reduction at a sulfide concentration of up to 72 mg S per L. The nitrate reduction rate reached 62.3 mg N per g VSS h−1. However, the nitrite reduction capacity of the sludge was low (up to 23.6 mg N per g VSS h−1). As a comparison, nitrate and nitrite reduction by the heterotrophic denitrifying sludge was significantly inhibited by sulfide, with 70% reduction. The sulfide inhibition of the denitrifying sludge was likely due to the toxicity of molecular hydrogen sulfide (H2Saq), because the inhibitory effects decreased at higher pH. Using a modified two-step denitrification model, the inhibitory effects of H2Saq on mixotrophic nitrate and nitrite reduction were well simulated. Cultivation of Thauera-dominated denitrifying sludge can improve nitrate reduction with sulfide effects, but nitrite accumulation should be considered when using sulfide as a complementary electron donor to treat wastewater with a low C/N ratio.
中文翻译：
硫化物对Thauera为主的反硝化污泥的混合营养反硝化作用的影响
当有机碳不足以还原硝酸盐时，硫化物可用作补充电子供体，以提高反硝化效率。但是，硫化物对反硝化剂有毒，可能会大大降低反硝化效率。在这项研究中，著名的兼性反硝化装置Thauera成功地富集了适用于硫化物的反硝化污泥。研究了硫化物对以Thauera为主的反硝化污泥进行异养和自养反硝化（混合养分反硝化）的影响。污泥可耐受硫化物的影响，并且在混合养分硝酸盐还原中的表现稳定，硫化物浓度高达每升72 mgS。硝酸盐还原速率达到62.3 mg N / g VSS h -1。但是，污泥的亚硝酸盐还原能力低（每g VSS h -1高达23.6 mg N ）。作为比较，异养反硝化污泥对硝酸盐和亚硝酸盐的还原被硫化物显着抑制，减少了70％。由于分子硫化氢（H 2 S aq）的毒性，反硝化污泥的硫化物抑制作用很可能是因为在较高的pH值下抑制作用降低了。使用改进的两步反硝化模型，很好地模拟了H 2 S aq对混合营养硝酸盐和亚硝酸盐还原的抑制作用。修罗的栽培主导的反硝化污泥可通过硫化作用改善硝酸盐的还原，但是当使用硫化物作为补充电子供体来处理低C / N比废水时，应考虑亚硝酸盐的积累。
更新日期：2020-04-24
中文翻译：
硫化物对Thauera为主的反硝化污泥的混合营养反硝化作用的影响
当有机碳不足以还原硝酸盐时，硫化物可用作补充电子供体，以提高反硝化效率。但是，硫化物对反硝化剂有毒，可能会大大降低反硝化效率。在这项研究中，著名的兼性反硝化装置Thauera成功地富集了适用于硫化物的反硝化污泥。研究了硫化物对以Thauera为主的反硝化污泥进行异养和自养反硝化（混合养分反硝化）的影响。污泥可耐受硫化物的影响，并且在混合养分硝酸盐还原中的表现稳定，硫化物浓度高达每升72 mgS。硝酸盐还原速率达到62.3 mg N / g VSS h -1。但是，污泥的亚硝酸盐还原能力低（每g VSS h -1高达23.6 mg N ）。作为比较，异养反硝化污泥对硝酸盐和亚硝酸盐的还原被硫化物显着抑制，减少了70％。由于分子硫化氢（H 2 S aq）的毒性，反硝化污泥的硫化物抑制作用很可能是因为在较高的pH值下抑制作用降低了。使用改进的两步反硝化模型，很好地模拟了H 2 S aq对混合营养硝酸盐和亚硝酸盐还原的抑制作用。修罗的栽培主导的反硝化污泥可通过硫化作用改善硝酸盐的还原，但是当使用硫化物作为补充电子供体来处理低C / N比废水时，应考虑亚硝酸盐的积累。
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