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611425 occurrences (No.13 in the rank) during 5 years in the PubMed. [no cache] 500 found

166) The ∑PFAs entering plant A decreased significantly in the final effluent of activated sludge process, while that in plant B increased significantly in the final effluent of sequencing batch reactor system.

--- ABSTRACT ---

PMID:23933955 DOI:10.1007/s11356-013-2044-8

2015 Environmental science and pollution research international

* Occurrence and fate of perfluorinated acids in two wastewater treatment plants in Shanghai, China.

- Perfluorinated acids (PFAs) have drawn much attention due to their environmental persistence, ubiquitous existence, and bioaccumulation potential. The discharge of wastewater effluent from municipal wastewater treatment plants (WWTPs) is a significant source of PFAs to the environment. In this study, wastewater and sludge samples were collected from two WWTPs in Shanghai, China, to investigate the contamination level and fate of PFAs in different stages of processing. The total concentrations of PFAs (∑PFAs) in influent from plants A and B were 2,452 and 292 ng L(-1), respectively. Perfluoropentanoic acid (1,520 ± 80 ng L(-1) in plant A and 89.2 ± 12.1 ng L(-1) in plant B) was the predominant PFA in influent waters, followed by perfluorooctanoic acid. The concentration of ∑PFAs ranged from 75.0 to 126.0 ng g(-1) dry weight in sludge samples from plant B, with perfluorooctanesulfonic acid as the predominant contaminant. The concentrations and fate of PFAs in different WWTPs vary. The ∑PFAs entering plant A decreased significantly in the final effluent of activated sludge process, while that in plant B increased significantly in the final effluent of sequencing batch reactor system. The concentration changes could be due to the sorption onto sludge, or the degradation of PFAs precursors.

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(1)36 the	(14)5 to	(27)2 RDW	(40)2 likelihood
(2)34 in	(15)4 after	(28)2 awareness	(41)2 maternal
(3)27 risk	(16)4 as	(29)2 bone	(42)2 morbidity
(4)21 null	(17)3 activity	(30)2 but	(43)2 number
(5)20 with	(18)3 among	(31)2 compared	(44)2 over
(6)16 by	(19)3 at	(32)2 concentrations	(45)2 pre-stimulus
(7)15 significantly	(20)3 cell	(33)2 drug	(46)2 production
(8)6 and	(21)3 level	(34)2 during	(47)2 rapidly
(9)6 expression	(22)3 levels	(35)2 fax	(48)2 use
(10)6 from	(23)3 physical	(36)2 functional	(49)2 vascular
(11)5 activation	(24)3 sensitivity	(37)2 hepatic
(12)5 odds	(25)2 MI	(38)2 if
(13)5 serum	(26)2 Math1	(39)2 interest

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--- WordNet output for increased --- =>力の増加 Overview of verb increase The verb increase has 2 senses (first 2 from tagged texts) 1. (86) increase -- (become bigger or greater in amount; "The amount of work increased") 2. (61) increase -- (make bigger or more; "The boss finally increased her salary"; "The university increased the number of students it admitted") Overview of adj increased The adj increased has 1 sense (first 1 from tagged texts) 1. (30) increased -- (made greater in size or amount or degree) --- WordNet end ---