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1. Comparison of ferrate and ozone pre-oxidation on disinfection byproduct formation from chlorination and chloramination

Author:
Jiang, Yanjun; Goodwill, Joseph E.; Tobiason, John E.; Reckhow, David A.
Source:
Water research 2019 v.156 pp. 110-124
ISSN:
0043-1354
Subject:
bromination; bromine; byproducts; chlorination; chlorine; chloropicrin; disinfection; haloacetic acids; iodine; organic matter; oxidants; ozone; water quality
Abstract:
... This study investigated the effects of ferrate and ozone pre-oxidation on disinfection byproduct (DBP) formation from subsequent chlorination or chloramination. Two natural waters were treated at bench-scale under various scenarios (chlorine, chloramine, each with ferrate pre-oxidation, and each with pre-ozonation). The formation of brominated and iodinated DBPs in fortified natural waters was ass ...
DOI:
10.1016/j.watres.2019.02.051

2. 2D kaolin ultrafiltration membrane with ultrahigh flux for water purification

Author:
Liu, Ting; Zhou, Huimin; Graham, Nigel; Yu, Wenzheng; Sun, Kening
Source:
Water research 2019 v.156 pp. 425-433
ISSN:
0043-1354
Subject:
cellulose acetate; cross-linking reagents; drinking water treatment; fouling; hydrophilicity; kaolin; lakes; nanosheets; organic matter; polyacrylamide; porosity; river water; surface water; ultrafiltration; water purification
Abstract:
... Membrane separation technology is an important option for the treatment of contaminated surface waters but the relatively high cost of materials and membrane fabrication represent a significant obstacle to the wider use of membrane processes. In this study, we describe the development and testing of a new kind of membrane made from two-dimensional (2D) kaolin nanosheets. The fabrication involved a ...
DOI:
10.1016/j.watres.2019.03.050

3. Dynamics and sources of colloids in shallow groundwater in lowland wells and fracture flow in sloping farmland

Author:
Zhang, Wei; Cheng, Jian-Hua; Xian, Qing-Song; Cui, Jun-Fang; Tang, Xiang-Yu; Wang, Gen-Xu
Source:
Water research 2019 v.156 pp. 252-263
ISSN:
0043-1354
Subject:
agricultural land; agricultural wastes; agricultural watersheds; aquifers; calcium carbonate; carbon; cations; colloids; dry season; groundwater; heavy metals; hydrochemistry; magnesium; mineral content; monitoring; organic matter; pH; pesticides; rain; regression analysis; soil; stable isotopes; structural equation modeling; temporal variation; water temperature; wells; wet season
Abstract:
... Field-scale studies of natural colloid mobilization and transport in finely fractured aquifer as well as the source identification of groundwater colloids are of great importance to the safety of shallow groundwater. In this study, the daily monitoring of fracture flow from a sloping farmland plot and the biweekly monitoring of three lowland shallow wells within the same catchment were carried out ...
DOI:
10.1016/j.watres.2019.03.012

4. Interactive effects of biotic and abiotic environmental stressors on carbamazepine toxicity in the non-biting midge Chironomus riparius

Author:
Heye, Katharina; Lotz, Thorsten; Wick, Arne; Oehlmann, Jörg
Source:
Water research 2019 v.156 pp. 92-101
ISSN:
0043-1354
Subject:
Chironomus riparius; anticonvulsants; ecotoxicology; freshwater ecosystems; hydrologic cycle; laboratory experimentation; larvae; midges; mortality; organic matter; population density; risk; temperature; toxicity
Abstract:
... The toxicity of contaminants in freshwater ecosystems can increase in combination with environmental stress, leading to a potential underestimation of risk in conventional assessments. The number of multiple-stress experiments in ecotoxicology is growing constantly, but pharmaceuticals have mostly been disregarded. As an omnipresent pharmaceutical in the water cycle, the antiepileptic drug carbama ...
DOI:
10.1016/j.watres.2019.03.007

5. Quantifying photo-production of triplet excited states and singlet oxygen from effluent organic matter

Author:
O'Connor, Meghan; Helal, Samantha R.; Latch, Douglas E.; Arnold, William A.
Source:
Water research 2019 v.156 pp. 23-33
ISSN:
0043-1354
Subject:
absorption; effluents; energy; hydrochemistry; molecular weight; organic matter; rivers; singlet oxygen; wastewater; wastewater treatment; Arizona; California; Minnesota
Abstract:
... The organic matter present in wastewater effluents (EfOM), is likely to have different properties than the organic matter present in the receiving water. The properties of EfOM will affect the fate of contaminants of emerging concern because EfOM is a source of photochemically produced reactive intermediates (PPRIs) capable of transforming contaminants. Effluent water samples were taken seasonally ...
DOI:
10.1016/j.watres.2019.03.002

6. Selective removal of bromide and iodide from natural waters using a novel AgCl-SPAC composite at environmentally relevant conditions

Author:
Ateia, Mohamed; Erdem, Cagri Utku; Ersan, Mahmut Selim; Ceccato, Marcel; Karanfil, Tanju
Source:
Water research 2019 v.156 pp. 168-178
ISSN:
0043-1354
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; activated carbon; bromides; bromination; bromine; byproducts; cytotoxicity; disinfection; energy-dispersive X-ray analysis; groundwater; haloacetic acids; iodides; organic matter; scanning electron microscopy; silver chloride; surface water; water treatment
Abstract:
... The removal of bromide (Br−) and iodide (I−) from source waters mitigates the formation of brominated and iodinated disinfection by-products (DBPs), which are more toxic than their chlorinated analogues. In this study, we report on our recently developed environmental-friendly method for the preparation of novel silver chloride/superfine activated carbon composite (AgCl-SPAC) to rapidly and select ...
DOI:
10.1016/j.watres.2019.03.028