Sun Jingyi, Simsek Halis
Department of Agricultural and Biosystems Engineering, North Dakota State University, Fargo, ND, USA.
Department of Agricultural and Biosystems Engineering, North Dakota State University, Fargo, ND, USA.
J Environ Sci (China). 2017 Jul;57:346-355. doi: 10.1016/j.jes.2016.12.017. Epub 2017 Jan 15.
Effluent dissolved organic nitrogen (DON) is problematic in nutrient sensitive surface waters and needs to be reduced to meet demanding total dissolved nitrogen discharge limits. Bioavailable DON (ABDON) is a portion of DON utilized by algae or algae+bacteria, while biodegradable DON (BDON) is a portion of DON decomposable by bacteria. ABDON and BDON in a two-stage trickling filter (TF) wastewater treatment plant was evaluated using three different microalgal species, Selenastrum capricornutum, Chlamydomonas reinhardtii and Chlorella vulgaris and mixed cultured bacteria. Results showed that up to 80% of DON was bioavailable to algae or algae+bacteria inoculum while up to 60% of DON was biodegradable in all the samples. Results showed that C. reinhardtii and C. vulgaris can be used as a test species the same as S. capricornutum since there were no significant differences among these three algae species based on their ability to remove nitrogen species.
废水溶解有机氮（DON）在对营养物质敏感的地表水中是个问题，需要减少以满足严格的总溶解氮排放限值。生物可利用性DON（ABDON）是藻类或藻类+细菌利用的DON的一部分，而可生物降解DON（BDON）是细菌可分解的DON的一部分。使用三种不同的微藻物种，即羊角月牙藻、莱茵衣藻和小球藻以及混合培养的细菌，对两级滴滤池（TF）污水处理厂中的ABDON和BDON进行了评估。结果表明，高达80%的DON对藻类或藻类+细菌接种物具有生物可利用性，而所有样品中高达60%的DON是可生物降解的。结果表明，莱茵衣藻和小球藻可以与羊角月牙藻一样用作测试物种，因为基于这三种藻类去除氮物种的能力没有显著差异。
