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Characteristics of dissolved organic nitrogen in effluent from a biological nitrogen removal process using sludge alkaline fermentation liquid as an external carbon source.
Water Research ( IF 12.8 ) Pub Date : 2020-03-20 , DOI: 10.1016/j.watres.2020.115741
Haidong Hu 1 , Sijia Ma 1 , Xuxiang Zhang 1 , Hongqiang Ren 1
Affiliation  

The addition of sludge alkaline fermentation liquid (SAFL) to biological nutrient removal (BNR) processes has been widely shown to reduce the dissolved inorganic nitrogen (DIN) in the effluent. However, knowledge regarding the effect of using SAFL in a BNR as an additional carbon source on the characteristics of dissolved organic nitrogen (DON) in the effluent is limited. This study investigated the effect of SAFL addition on effluent DON features and microbial community dynamics in a BNR process treating municipal wastewater. The performance of SAFL was compared with other two reactors (i.e., without an external carbon source and with the addition of sodium acetate). The results showed that the addition of SAFL can significantly reduce effluent DON (p < 0.05). The effluent DON was slightly higher with SAFL than with sodium acetate, but the bioavailable DON of the two reactors was similar (1.06 ± 0.11 vs 1.04 ± 0.12 mg/L, respectively, p > 0.05). The SAFL addition led to a decreased percentage of low molecular weight DON (p < 0.05) as well as an increased ratio of fulvic-like and humic-like substances to proteins-like substances. Moreover, the SAFL addition resulted in a lower percentage of substances resembling proteins/amino sugars and a higher percentage of lignin-like molecules than sodium acetate. These features accounted for the low DON bioavailability. The SAFL promoted the increased abundance of Bacteroidetes, Chloroflexi, Comamonadaceae and Rhodocyclaceae, which could be associated with the decreased effluent DON and its bioavailability. This study indicates that using SAFL as a BNR carbon source not only improves the removal of DIN but also reduces effluent DON and specifically DON bioavailability. These results facilitate the acquisition of comprehensive knowledge regarding the use of SAFL as an alternative external carbon source in the BNR process.

中文翻译:

使用污泥碱性发酵液作为外部碳源的生物脱氮过程中废水中溶解的有机氮的特征。

污泥碱性发酵液(SAFL)添加到生物营养物去除(BNR)过程中已被广泛证明可以减少废水中的溶解性无机氮(DIN)。但是,关于在BNR中使用SAFL作为附加碳源对废水中溶解的有机氮(DON)的特性的影响的知识是有限的。这项研究调查了SAFL的添加对BNR处理市政废水的出水DON特性和微生物群落动态的影响。将SAFL的性能与其他两个反应器(即不使用外部碳源且添加乙酸钠)进行了比较。结果表明,添加SAFL可以显着减少废水中的DON(p <0.05)。SAFL的出水DON略高于乙酸钠,但是两个反应器的生物利用度DON相似(分别为1.06±0.11和1.04±0.12 mg / L,p> 0.05)。添加SAFL导致低分子量DON的百分比降低(p <0.05),以及像黄腐和腐殖质与蛋白质一样的物质的比例增加。此外,与乙酸钠相比,添加SAFL导致类似于蛋白质/氨基糖的物质的百分比降低,而类似木质素的分子的百分比升高。这些功能导致DON生物利用度低。SAFL促进了拟杆菌,绿弯曲菌,Comamonadaceae和Rhodocyclaceae的丰度增加,这可能与减少的DON排放量及其生物利用度有关。这项研究表明,使用SAFL作为BNR碳源不仅可以改善DIN的去除,还可以降低废水中的DON尤其是DON的生物利用度。这些结果有助于获得有关在BNR工艺中使用SAFL作为替代外部碳源的全面知识。
更新日期:2020-03-20
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