Sorption of biodegradation end produ

Sorption of biodegradation end products of nonylphenol polyethoxylates onto activated sludge

Abstract： Nonylphenol(NP), nonylphenoxy acetic acid(NP1EC), nonylphenol monoethoxy acetic acid(NP2EC),nonylphenol monoethoxylate (NP1EO) and nonylphenol diethoxylate (NP2EO) are biodegradation end products (BEPs) of nonionic surfactant nonylphenolpolyethoxylates (NP nEO). In this research, sorption of these compounds onto model activated sludge was characterized. Sorption equilibrium experiments showed that NP, NP1EO and NP2EO reached equilibrium in about 12 h, while equilibrium of NP1EC and NP2EC were reached earlier, in about 4h. In sorption isotherm experiments, obtained equilibrium data at 28 ℃ fitted well to Freundlich sorption model for all investigated compounds. For NP1EC, in addition to Freundlich, equilibrium data also fitted well to Langmuir model.Linear sorption model was also tried, and equilibrium data of all NP, NP1EO, NP2EO and NP2EC except NP1EC fitted well to this model. Calculated Freundlich coefficient ( KF ) and linear sorption coefficient (KD) showed that sorption capacity of the investigated compounds were in order NP ＞ NP2EO ＞ NP1EO ＞ NP1EC≈ NP2EC. For NP,NP1EO and NP2EO, high values of calculated KF and KD indicated an easy uptake of these compounds from aqueous phase onto activated sludge. Whereas, NP1EC and NP2EC with Iow values of KF and KD absorbed weakly to activated sludge and tended to preferably remain in aqueous phase. 作 者： Nguyen Viet Hung    Masafumi Tateda    Michihiko Ike    Masanori Fujita    Shinji Tsunoi    Minoru Tanaka   作者单位： Nguyen Viet Hung,Michihiko Ike,Masanori Fujita(Department of Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan)

Masafumi Tateda(Department of Environmental Systems Technology, College of Technology, Toyama Prefectural University, 5180 Kurokawa, Kosugi, Imizu, Toyama,939-0398, Japan)

Shinji Tsunoi,Minoru Tanaka(Research Center for Environmental Preservation, Osaka University, 2-4 Yamada-oka, Suita,Osaka 565-0871, Japan) 

期 刊： 环境科学学报(英文版)  ISTICSCI   Journal： JOURNAL OF ENVIRONMENTAL SCIENCES  年，卷(期)： 2004, 16(4)  分类号： X13  Keywords： activated sludge    biodegradation end products    endocrine disruptor    nonylphenol polyethoxylates    sorption   

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