Removal Characteristics of Dissolved Organic Nitrogen and Its Bioavailable Portion in a Postdenitrifying Biofilter: Effect of the C/N Ratio,Environmental Science & Technology

当前位置： X-MOL 学术 › Environ. Sci. Technol. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Removal Characteristics of Dissolved Organic Nitrogen and Its Bioavailable Portion in a Postdenitrifying Biofilter: Effect of the C/N Ratio
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2018-01-05 00:00:00 , DOI: 10.1021/acs.est.7b05115
Haidong Hu ₁ , Kewei Liao ₁ , Jinju Geng ₁ , Ke Xu ₁ , Hui Huang ₁ , Jinfeng Wang ₁ , Hongqiang Ren ₁

Affiliation

Addition of external carbon sources to postdenitrification biofilters (DNFs) is frequently used in municipal wastewater treatment plants to enhance dissolved inorganic nitrogen removal. However, little is known about its influence on the removal of dissolved organic nitrogen (DON). This study investigated the effect of the carbon-to-nitrogen (C/N) ratio (3, 4, 5, and 6) on the removal characteristics of DON and bioavailable DON (ABDON) in the pilot-scale DNFs treating real secondary effluent. Results showed that DNFs effluent DON accounted for 31.2–39.8% of the effluent total nitrogen. The maximum effluent DON and ABDON concentrations both occurred in DNF operated at a C/N ratio of 3. There was no significant difference in effluent DON concentrations in DNFs at C/N ratios of 4, 5, and 6; however, effluent ABDON and DON bioavailability significantly decreased with C/N ratios (p < 0.05, t-test). According to the chemical composition analysis, effluent DON at high C/N ratios tends to contain less % molecular weight < 1 kDa nitrogenous organic compounds and proteins/amino sugars-like nitrogenous organic formulas, which is likely responsible for its low bioavailability. Overall, this study indicates the benefit of a high C/N ratio during the DNF process in terms of controlling the DON forms that readily stimulate algal growth.

中文翻译：

脱硝后生物滤池中溶解有机氮的去除特征及其生物有效性部分：C / N比的影响

在市政废水处理厂中，经常将外部碳源添加到反硝化后生物滤池（DNF）中，以提高溶解性无机氮的去除率。然而，关于其对去除溶解有机氮（DON）的影响知之甚少。这项研究调查了碳氮比（C / N）（3、4、5和6）对中试规模DNF处理真实二级废水中DON和生物利用性DON（ABDON）去除特性的影响。结果表明，DNFs废水中的DON占废水中总氮的31.2–39.8％。在C / N为3的DNF中，最大的废水DON和ABDON浓度都发生了。在C / N为4、5和6的DNF中，DON的废水DON浓度没有显着差异。然而，p＜0.05，t检验）。根据化学成分分析，高C / N比的污水DON往往含有较少的分子量小于1 kDa的含氮有机化合物和类似蛋白质/氨基糖的含氮有机分子式，这可能是其低生物利用度的原因。总体而言，这项研究表明，在控制容易刺激藻类生长的DON形式方面，DNF过程中高C / N比的好处。

更新日期：2018-01-05

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11