厌氧选择性脱氮除硫的调控影响因素研究及微生物群落结构分析

发布时间：2018-04-22 18:31

本文选题：电子受体 + N/S　；参考：《西安建筑科技大学》2015年硕士论文

【摘要】：本文主要针对厌氧脱氮除硫工艺中,以降低硫化物和NO3-的出水浓度及提高单质硫和氮气的转化率为目标,主要研究了N/S、停留时间、电子受体类型、硫化物负荷和进水p H等调节因子对厌氧选择性脱氮除硫的影响,得出厌氧选择性脱氮除硫的调控条件。主要结论如下:(1)以NO3-为电子受体,去除硫化物最佳N/S 0.67,去除NO3-最佳N/S比为0.5~1.0,最佳产单质硫N/S为0.5,可见控制N/S为0.5~1.0可实现同步脱氮除硫;以NO2-为电子受体,去除硫化物最佳N/S为0.67,去除NO2-最佳N/S为0.2~1.0,去除率均达99%以上,脱氮不受抑制,NO2-的去除率高于NO3-的去除率,表明硫化物可以快速去除NO2-,是亚硝酸盐体系反硝化脱氮的适宜电子供体。(2)以NO3-为电子受体,水力停留时间24h,N/S为0.5选择性生成单质硫达24%,选择性生成硫酸盐为30%,选择性生成氮气N/S为1.0,产氮气量达58m L。以NO2-为电子受体,水力停留时间24h,N/S为0.67选择性生成单质硫达11.01%,选择性生成硫酸盐为53.58%,选择性生成氮气N/S值为2.0,产氮气量达74m L。表明电子受体对单质硫的选择性更明显,以NO3-为电子受体产生的单质硫高于以NO2-为电子受体。亚硝酸盐体系氮气产生规律与硝酸盐体系明显不同,表明二者转化途径可能不同,NO3-主要通过自养反硝化脱氮过程去除,而NO2-主要通过厌氧氨氧化、异养反硝化等作用去除。(3)当N/S为1.0~2.0条件下,进水硫化物浓度在150~350mg/L时,水力停留时间24h,出水硫化物浓度均小于4.2mg/L,去除率高达98%,当进水硫化物提高到400mg/L时,脱硫受到抑制。当N/S为0.5~0.67,进水硫化物浓度150~250mg/L,水力停留时间24h,出水NO3-浓度小于14mg/L,去除率均大于70%,进水硫化物浓度提高到300mg/L,脱氮受到抑制。表明提高硫化物负荷,进水硫化物浓度高于250mg/L时脱氮受到抑制,而进水硫化物浓度高于350mg/L时脱硫才受到抑制。(4)在进水硫化物浓度为250~400mg/L,N/S为1.0条件下,选择性生成单质硫最高达33.2%,选择性生成硫酸盐为36.04%,表明提高硫化物负荷有利于选择性生成单质硫。进水硫化物浓度为150~300mg/L,N/S为0.5条件下,选择性生成氮气最高达64m L,表明提高硫化物负荷,高N/S并不利于选择性生成氮气。(5)当进水硫化物浓度为200mg/L,水力停留时间24h,去除硫化物最佳进水p H=7.5~8.0,去除NO3-最佳进水p H=8.5~9.0。当进水硫化物浓度为300mg/L,水力停留时间48h,去除硫化物最佳进水p H=7.5~9.0,去除NO3-最佳进水p H=8.5~9.0。(6)对于不同硫化物负荷系统,最佳选择性生成单质硫进水p H=7.5~8.0,选择性生成单质硫最高达30%,对应选择性生成硫酸盐为10.21%。选择性生成氮气最佳进水p H=8.5~9.0,水力停留24h,产氮气量最大达60m L。(7)反应器内以形成Sulfurovum、Kluyvera为主的脱硫、脱氮功能微生物;反应器内优势菌种数量随着进水p H值的升高而减少,同时提高进水硫化物浓度和进水p H值,反应器群落多样性减小。
[Abstract]:In order to reduce the effluent concentration of sulfides and NO3- and increase the conversion of sulfur and nitrogen, the N / S, residence time and electron receptor type were studied in this paper. The influence of sulfide loading and influent pH on anaerobic selective denitrification and sulfur removal was studied and the control conditions of anaerobic selective nitrogen and sulfur removal were obtained. The main conclusions are as follows: (1) with no _ 3- as the electron receptor, the best N / S _ (0.67), the best N / S / S ratio and the N / S ratio are 0.5 ~ 1.0 and 0.5 respectively. It can be seen that the nitrogen and sulfur removal can be achieved by controlling N / S as 0.5 ~ (1.0), and no _ 2- as an electron receptor. The best N / S ratio for sulfides removal was 0.67, and the best N / S removal rate for no _ 2-N _ 2- was 0.2n ~ (-1), and the removal rates were all above 99%. The removal rate of no _ 2-- was higher than that of no _ 3-, and the removal rate of no _ 2- was higher than that of no _ 3-. The results show that sulfide can remove no _ 2-rapidly and is the suitable electron donor for denitrification and denitrification in nitrite system. The HRT was 0.5 h ~ (-1) to form sulfur, 30% sulfate, 1.0% N ~ (2 +), and 58 m / L N ~ (2 +), respectively. With no _ 2- as the electron acceptor, HRT = 0.67 N / S = 0.67 to form elemental sulfur, 53.58 sulfates, 2.0 N / S, and 74 mL N / L, selective formation of sulfate, N / S and N ~ (2 +), N _ (2 / S) and N ~ (2 +), N _ (2 / S) and N ~ (2 +) N / S = 0.67, respectively. The results showed that the selectivity of electron receptors to elemental sulfur was more obvious than that of no _ 3- as electron receptors. The pattern of nitrogen production in nitrite system is obviously different from that in nitrate system, which indicates that the two transformation pathways may be different from each other, and no _ 2- may be removed mainly by autotrophic denitrification, while no _ 2- is mainly oxidized by anaerobic ammonia. Heterotrophic denitrification removal. 3) when N / S is 1.0 ~ (2.0), when the influent sulfide concentration is in 150~350mg/L, the HRT is 24 h, the effluent sulfide concentration is less than 4.2 mg / L, the removal rate is as high as 98%. When the influent sulfide is increased to 400mg/L, the desulfurization is inhibited. When N / S is 0.5 ~ 0.67, influent sulfide concentration is 150 ~ 250 mg / L, HRT is 24 h, effluent NO3- concentration is less than 14 mg / L, removal rate is more than 70%, influent sulfide concentration is increased to 300 mg / L, denitrification is inhibited. The results show that when sulphide concentration in influent is higher than 250mg/L, denitrification is inhibited when sulphide concentration is higher than 350mg/L, and desulfurization is inhibited only when influent sulfide concentration is higher than 350mg/L. The selective formation of elemental sulfur is up to 33.2 and the selective formation of sulphate is 36.04, which indicates that increasing the sulphide load is beneficial to the selective formation of elemental sulfur. When the influent sulfides concentration is 150 ~ 300mg / L ~ (-1) N / S = 0.5, the highest selective nitrogen generation is 64 mL, which indicates that the sulphide load is increased. When the influent sulfide concentration is 200 mg / L, the HRT is 24 h, the best influent water pH is 7.5% 8.0 and no 3- is 8.5% 9. 0 when the influent sulfide concentration is 200 mg / L and the hydraulic retention time is 24 h, the high N / S is not suitable for the selective formation of nitrogen gas. When the influent sulfide concentration is 300 mg / L, the HRT is 48 h, the best influent water for removing sulfides is 7.5U 9.0, and the best influent no _ 3- is 8.5 mg / L, 9.0.60) for different sulfides loading systems, The optimum selectivity for the formation of elemental sulfur in influent was 7.5 ~ 8.0, and the maximum of selective formation of elemental sulfur was 30. The corresponding selective formation of sulphate was 10.21. The optimum influent pH of selective nitrogen production was 8.5c9.0, the hydraulic retention was 24h, and the maximum nitrogen and gas production was 60m 路L ~ (7)) in the reactor, the desulfurization and denitrification function of Sulfurovum Kluyvera was formed, and the number of dominant bacteria in the reactor decreased with the increase of influent pH value. At the same time, the diversity of reactor community was reduced by increasing influent sulfide concentration and influent pH value.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703

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