title: Anaerobic degradation behavior of nonylphenol polyethoxylates in sludge.
abstract: Anaerobic biodegradation behavior of nonylphenol polyethoxylates (NPEOs) was investigated. Results showed that terminal electron acceptors, organic matters, initial concentration, and temperature had great influence on the anaerobic biodegradation of NPEOs. Anaerobic biodegradation of NPEOs could be enhanced by adding sulfate or nitrate while this process could be inhibited by adding organic matters. The maximum removal rate increased 1.24 microM d(-1) for each ten micromoles increase in initial concentration. The decrease in temperature caused a sharp decrease in the removal efficiency of NPEOs. The temperature coefficient (PHI) for the anaerobic biodegradation of NPEOs was 0.01 degrees C(-1). Nonylphenol (NP), the typical intermediate of NPEOs, could inhibit the anaerobic biodegradation of NPEOs only at high concentration. However, these environmental factors had no effect on the anaerobic biodegradation pathway of NPEOs. The accumulation of NP and short-chain NPEOs during NPEO biodegradation led to a significant increase in the estrogenic activity during the biodegradation period.
authors.affiliation: School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China.
authors.forename: Jian
authors.initials: J
authors.lastname: Lu
authors.forename: Qiang
authors.initials: Q
authors.lastname: Jin
authors.forename: Yiliang
authors.initials: Y
authors.lastname: He
authors.forename: Jun
authors.initials: J
authors.lastname: Wu
authors.forename: Wenying
authors.initials: W
authors.lastname: Zhang
authors.forename: Juan
authors.initials: J
authors.lastname: Zhao
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D003998:Dicarboxylic Acids / Q000378:metabolism*; D004784:Environmental Monitoring; D004785:Environmental Pollutants / Q000378:metabolism*; D010636:Phenols / Q000378:metabolism*; D011092:Polyethylene Glycols / Q000378:metabolism*; D012722:Sewage / Q000737:chemistry / Q000382:microbiology*; D013501:Surface-Active Agents / Q000378:metabolism*; D013696:Temperature; D013997:Time Factors
chemical_list: D003998:Dicarboxylic Acids; D004785:Environmental Pollutants; D010636:Phenols; D012722:Sewage; D013501:Surface-Active Agents; D011092:Polyethylene Glycols; C025256:nonylphenol