臭氧氧化法在水处理厂中溶解有机氮及其可生物降解部分。
Dissolved organic nitrogen and its biodegradable portion in a water treatment plant with ozone oxidation.
机构信息
Department of Civil and Environmental Engineering, North Dakota State University, Dept. # 2470, P.O. Box 6050, Fargo, ND 58108-6050, USA.
Department of Agriculture and Biosystems Engineering, North Dakota State University, Fargo, ND 58108, USA.
出版信息
Water Res. 2014 May 1;54:318-26. doi: 10.1016/j.watres.2014.02.009. Epub 2014 Feb 12.
Biodegradability of dissolved organic nitrogen (DON) has been studied in wastewater, freshwater and marine water but not in drinking water. Presence of biodegradable DON (BDON) in water prior to and after chlorination may promote formation of nitrogenous disinfectant by-products and growth of microorganisms in the distribution system. In this study, an existing bioassay to determine BDON in wastewater was adapted and optimized, and its application was tested on samples from four treatment stages of a water treatment plant including ozonation and biologically active filtration. The optimized bioassay was able to detect BDON in 50 μg L(-1) as N of glycine and glutamic solutions. BDON in raw (144-275 μg L(-1) as N), softened (59-226 μg L(-1) as N), ozonated (190-254 μg L(-1) as N), and biologically filtered (17-103 μg L(-1) as N) water samples varied over a sampling period of 2 years. The plant on average removed 30% of DON and 68% of BDON. Ozonation played a major role in increasing the amount of BDON (31%) and biologically active filtration removed 71% of BDON in ozonated water.
溶解态有机氮（DON）的可生物降解性已在废水、淡水和海水中进行了研究，但在饮用水中尚未进行研究。在氯化前后，水中存在可生物降解的 DON（BDON）可能会促进氮类消毒剂副产物的形成和在配水系统中微生物的生长。在本研究中，对现有的测定废水 BDON 的生物测定法进行了改进和优化，并将其应用于包括臭氧氧化和生物活性过滤在内的水处理厂四个处理阶段的水样中进行了测试。优化后的生物测定法能够检测到 50μg/L（以 N 计的甘氨酸和谷氨酸溶液）的 BDON。在 2 年的采样期内，原水（以 N 计 144-275μg/L）、软化水（以 N 计 59-226μg/L）、臭氧氧化水（以 N 计 190-254μg/L）和生物过滤水（以 N 计 17-103μg/L）中 BDON 的含量变化较大。该水厂平均去除了 30%的 DON 和 68%的 BDON。臭氧氧化在增加 BDON 含量方面发挥了主要作用（增加了 31%），而生物活性过滤则去除了臭氧氧化水中 71%的 BDON。
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