Identification of persistent anionic surfactant-derived chemicals in sewage effluent and groundwater

Journal of Contaminant Hydrology, Journal Year: 1992, Volume and Issue: 9(1-2), P. 55 - 78

Published: Jan. 1, 1992

Language: Английский

---

The environmental fate of the primary degradation products of alkylphenol ethoxylate surfactants in recycled paper sludge

Chemosphere, Journal Year: 1999, Volume and Issue: 39(5), P. 745 - 752

Published: Aug. 1, 1999

Language: Английский

---

HPLC Determination of ethoxylated alcohol surfactants in wastewater

Journal of the American Oil Chemists Society, Journal Year: 1990, Volume and Issue: 67(2), P. 103 - 109

Published: Feb. 1, 1990

Abstract High performance liquid chromatography (HPLC) may be used for analysis of municipal wasterwater containing ethoxylated alcohol surfactants. After cleanup the sample by XAD‐2 resin, liquid‐liquid extraction, ion exchange and cobalt thiocyanate surfactant is derivatized with phenyl isocyanate to permit UV detection analyzed both normal phase reversedphase HPLC. The alkyl chain length distribution determined using reversed‐phase HPLC, while ethoxy limit quantification 0.1 ppm.

Language: Английский

---

Biodegradability of non-ionic surfactants

Springer eBooks, Journal Year: 1995, Volume and Issue: unknown, P. 204 - 230

Published: Jan. 1, 1995

Language: Английский

---

Surfactants Containing Hydrolyzable Bonds

Advances in polymer science, Journal Year: 2008, Volume and Issue: unknown, P. 57 - 82

Published: Jan. 1, 2008

Language: Английский

---

1. Chemistry of surfactants

Studies in interface science, Journal Year: 2001, Volume and Issue: unknown, P. 1 - 97

Published: Jan. 1, 2001

Language: Английский

---

Effects of Ozone/Hydrogen Peroxide Pretreatment on Aerobic Biodegradability of Nonionic Surfactants and Polypropylene Glycol

Environmental Science & Technology, Journal Year: 2000, Volume and Issue: 34(11), P. 2305 - 2310

Published: May 4, 2000

Studies were conducted which used the ozone/hydrogen peroxide (O3/H2O2) advanced oxidation process to pretreat three classes of compounds prior aerobic biological treatment. The study included ethylene oxide/propylene oxide (EO/PO) block copolymers, polypropylene glycols (PPGs), linear secondary alcoholethoxylates (LSAEs), and alkylphenolethoxylates (APEs). After preoxidation with ozone hydrogen (added at their stoichiometric ratio), 300 mg/L as COD samples bioassayed in batch bioassays a mixed liquor suspended solids concentration 1500 mg/L. It was found that unoxidized polypropylated (EO/PO copolymers PPGs) LSAEs tended be biorecalcitrant, while (APEs) partially biodegradable. Increasing oxidant dosages (i.e., plus peroxide) consistently increased both rate extent biodegradation these exception NP(EO)5, initially decreased biodegradability upon oxidation. Oxidant required enhance varied significantly between within surfactant. For example, average reach an 85% DOC removal 0.3 mg O3/mg compound (plus H2O2) for LSAEs, 1.0 mg/mg EO/PO PPGs, 5.0 APEs, respectively.

Language: Английский

---

Enhanced Desorption of Herbicides Sorbed on Soils by Addition of Triton X‐100

Journal of Environmental Quality, Journal Year: 2004, Volume and Issue: 33(3), P. 920 - 929

Published: May 1, 2004

ABSTRACT A study of the desorption atrazine (1‐chloro‐3‐ethylamino‐5‐isopropylamino‐2,4,6‐triazine) and linuron [1‐methoxy‐1‐methyl‐3‐(3,4‐dichlorophenyl)urea] adsorbed on soils with different organic matter (OM) clay contents was conducted in water presence non‐ionic surfactant Triton X‐100 at concentrations. The aim to gain insight into soil characteristics surfactant‐enhanced herbicides from soils. Adsorption isotherms water, all solutions for atrazine, 0.75 times critical micelle concentration (cmc) 1.50cmc fit Freundlich equation. All showed hysteresis. Hysteresis coefficients decreased increased or solutions. These variations were dependent OM contents. In soil–water–surfactant system always greater than soil–water but this only occurred concentrations higher 50cmc. For highest (100cmc), most hydrophobic herbicide (linuron) more 18‐fold respect an content 10.3% while 3‐fold. effect both very low a high content. results indicate potential use facilitate these water–surfactant system. They also contribute better understanding interactions molecules surfaces complex soil–herbicide–water

Language: Английский

---

Parvibaculum lavamentivorans converts linear alkylbenzenesulphonate surfactant to sulphophenylcarboxylates, alpha,beta-unsaturated sulphophenylcarboxylates and sulphophenyldicarboxylates, which are degraded in communities

Journal of Applied Microbiology, Journal Year: 2004, Volume and Issue: 96(3), P. 630 - 640

Published: March 1, 2004

The aims were to test whether Parvibaculum lavamentivoransT degraded commercial linear alkylbenzenesulphonate (LAS) surfactant via omega-oxygenation and beta-oxidation sulphophenylcarboxylates (SPCs), the organism was widespread reisolable, degradative community used 4-sulphocatechol 1,2-dioxygenase cleave aromatic ring from LAS.Heterotrophic P. converted LAS (side chain length C10-C13) SPCs (C4-C13), alpha,beta-unsaturated (C4-C13) sulphophenyldicarboxylates (SPdCs) (at least C8-C12). Identifications came high performance liquid chromatography (HPLC) separation, an electrospray interface mass spectrometry. No evidence for other paths found. degradation of in trickling filters inoculated with environmental samples always showed transient SPC intermediates presence lavamentivorans morphotype community. One new isolate obtained. A able mineralize contained 4-sulphocatechol-1,2-dioxygenase at specific activity.Parvibaculum degrades omega-oxygenation, oxidation shortening through yield a wide range SPCs. latter are bacterial communities which contain organisms like lavamentivorans, utilize sulphocatechol dioxygenase cleavage.There is one pathway degrade LAS. Any traces larger amounts effluent sewage works exposed acclimated pristine environments. These reactions can now be studied pure cultures.

Language: Английский

---

An optimization and modeling approach for H₂O₂/UV‐C oxidation of a commercial non‐ionic textile surfactant using central composite design

Journal of Chemical Technology & Biotechnology, Journal Year: 2009, Volume and Issue: 85(4), P. 493 - 501

Published: Dec. 7, 2009

Abstract BACKGROUND: Industrial surfactants are biologically complex organics that difficult to degrade and may cause ecotoxicological risks in the environment. Until now, many scientific reports have been devoted effective treatment of employing advanced oxidation processes, but there is no available experimental study dealing with optimization statistical design surfactant well‐established H 2 O /UV‐C process. RESULTS: Considering major factors influencing performance as well their interactions, reaction conditions required for complete a commercial non‐ionic textile surfactant, an alkyl ethoxylate, were modeled optimized using central composite design‐response surface methodology (CCD‐RSM). Experimental results revealed aqueous solution at initial chemical oxygen demand (COD) 450 mg L −1 , most appropriate achieve full mineralization pH 10.5 47 mmol time 86 min (corresponding UV dose 30 kWh m −3 ). CONCLUSION: CCD allowed development empirical polynomial equations (quadratic models) successfully predicted COD TOC removal efficiencies under all employed present work. The process variable time, followed by content found be main parameters affecting performance, whereas concentration had least influence on efficiencies. more important abatement compared abatement. Copyright © 2009 Society Chemical Industry

Language: Английский

---