生物膜-活性污泥工艺强化硫化物自养反硝化技术
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摘要
研究采用生物膜-活性污泥组合工艺(IFAS)处理模拟市政污水,硫化物作为电子供体,推动自养反硝化脱氮。在厌氧无COD添加,NO_3~-、S_2~-的质量浓度分别为(100±10)、(80±5) mg/L,温度25℃,水力停留时间12 h的条件下,共运行140 d。结果表明,生物膜具为作用细菌在反应器中提供了稳定的生长场所,反应器稳定达到95%以上的TN去除率。硫氮摩尔比对硫化物最终产物有直接影响,适宜运行pH条件为8.0等结论。该技术可实现高效脱氮,有着反应可控性高、装置简易、反应建立时间短,且运行稳定、污泥产量少好等优点,适用于低碳氮比的市政污水处理及工业污水。
The integrated fixed-film activated sludge(IFAS) was used to treat simulated municipal wastewater and the sulfide was used as electron donor to promote autotrophic denitrification. The operation ran 140 d under the conditions of anaerobic non-COD addition, mass concentration of NO_3~- and S_2~- was(100±10) mg/L and(80±5) mg/L respectively, temperature was 25 ℃ and hydraulic retention time was 12 h. The results showed that, The fixed-film provided a stable growth site for the bacteria in the reactor, and the total nitrogen removal rate stabled at more than 95% of the reactor. The sulfur-nitrogen ratio(S/N) had a direct effect on the final product of the sulfide and the optimum p H for the operation was 8.0. The technology can realize high-efficiency denitrification, which has the advantages of high reaction controllability, simple experimental device, short reaction set-up time, stable operation and less sludge yield, and is suitable for the municipal sewage treatment and industrial sewage with low carbon and nitrogen ratio.
The integrated fixed-film activated sludge(IFAS) was used to treat simulated municipal wastewater and the sulfide was used as electron donor to promote autotrophic denitrification. The operation ran 140 d under the conditions of anaerobic non-COD addition, mass concentration of NO_3~- and S_2~- was(100±10) mg/L and(80±5) mg/L respectively, temperature was 25 ℃ and hydraulic retention time was 12 h. The results showed that, The fixed-film provided a stable growth site for the bacteria in the reactor, and the total nitrogen removal rate stabled at more than 95% of the reactor. The sulfur-nitrogen ratio(S/N) had a direct effect on the final product of the sulfide and the optimum p H for the operation was 8.0. The technology can realize high-efficiency denitrification, which has the advantages of high reaction controllability, simple experimental device, short reaction set-up time, stable operation and less sludge yield, and is suitable for the municipal sewage treatment and industrial sewage with low carbon and nitrogen ratio.
引文
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[14]王靓,袁怡,宋吟玲.硫化物型自养反硝化中NO2--N与S0的积累条件[J].环境科学与技术,2013,36(12):20-23.
[15]DOLEJS P,PACL魱K L,MACA J,et al.Effect of S/N ratio on sulfide removal by autotrophic denitrification.Applied microbiology and Biotechnology,2015,99(5):2383-2392.
[2]李小玥.硫自养反硝化处理氨氮废水工艺研究[D].北京:北京交通大学,2009.
[3]王建超,郝瑞霞,孟成成,等.3DBER-S反硝化脱氮性能及其菌群特征[J].环境科学研究,2015,28(2):310-317.
[4]POKORNA D,ZABRANSKA J.Sulfur-oxidizing bacteria in environmental technology[J].Biotechnology Advances,2015,33(6):1246-1259.
[5]刘苗苗.活性污泥投加粉末活性炭对硝化反硝化的影响研究[D].扬州:扬州大学,2017.
[6]LEE E.Y,LEE N Y,CHO K S,et al.Removal of hydrogen sulfide by sulfate-resistant Acidithiobacillus thiooxidans AZ11.Journal of Bioscience and Bioengineering,2006,101(4):309-314.
[7]贾磊,陈洪斌,王建翔,等.低浓度污水条件下MBBR启动及处理效果的中试[J].水处理技术,2007,33(7):57-60.
[8]CHEN C,WANG A,REN N,et al.High-rate denitrifying sulfide removal process in expanded granular sludge bed reactor.Bioresource Technology,2009,100(7):2316-2319.
[9]RANDALL C W,SEN D.Full-scale evaluation of an integrated fixed-film activated sludge(IFAS)process for enhanced nitrogen removal[J].Water science and Technology,1996,33(12):155-162.
[10]REGMI P,THOMAS W,SCHAFRAN G,et al.Nitrogen removal assessment through nitrification rates and media biofilm accumulation in an IFAS process demonstration study[J].Water research,2011,45(20):6699-6708.
[11]国家环境保护总局《水和废水监测分析方法》编委会.水和废水监测分析方法[M].4版.北京:中国环境科学出版社,2002.
[12]MORAES B D S,SOUZA T S O,FORESTI E.Effect of sulfide concentration on autotrophic denitrification from nitrate and nitrite in vertical fixed-bed reactors[J].Process Biochemistry,2012,47(9):1395-1401.
[13]SEN D,MITTA P,RANDALL C W.Performance of fixed film media integrated in the activated sludge reactors to enhance nitrogen removal[J].Water Science&Technology,1994,30(11):13-24.
[14]王靓,袁怡,宋吟玲.硫化物型自养反硝化中NO2--N与S0的积累条件[J].环境科学与技术,2013,36(12):20-23.
[15]DOLEJS P,PACL魱K L,MACA J,et al.Effect of S/N ratio on sulfide removal by autotrophic denitrification.Applied microbiology and Biotechnology,2015,99(5):2383-2392.