Reckitt Benckiser is a manufacturer of a variety of household cleaning and pesticide products, including rodenticides, sold widely under the D-Con brand. In recent years Reckitt Benckiser has formulated rodenticide products using what is known as a “second-generation” anti-coagulant, brodifacoum. The term second-generation refers to the lack of resistance in rodents, which has developed in some cases to earlier, “first-generation” anti-coagulant products, such as warfarin.
Case study - City of Montreal upgrade of Atwater and Des Baillets water treatment plants
Sidestream Venturi Injection—Basin Nozzle Manifold Contacting System. Montreal, Quebec, CanadaThe Problem: In 2001, a water quality audit revealed that two of the largest drinking water plants in the City of Montreal were out of compliance with Quebec’s latest water quality rules. In response to the audit, the city upgraded the 1,400 MLD Atwater and the 1,280 MLD Charles J. Des Baillets (Des Baillets ) Water Treatment Plants (WTPs) to comply with the water quality rules and meet the water quality...
Zirconium and chitosan coagulants for drinking water treatment – a pilot study
Scientists continuously search for alternative coagulants that would be able to outperform traditionally used aluminium (Al) and iron (Fe). Use of a novel metal coagulant zirconium (Zr) has been associated with enhanced organic matter reduction. On the other hand, eco-friendly non-metal solutions, such as chitosan, can provide non-toxic sludge and water with no metal residue. In fact, Zr and chitosan have been utilized in full-scale operation by several water plants in Norway providing over 50,000 recipients in...
A study of the reaction of ferrate with pentachlorophenol – kinetics and degradation products
Pentachlorophenol (PCP) is a persistent pollutant which has been widely used as a pesticide and a wood preservative. As PCP is toxic and is present in significant quantities in the environment, there is considerable interest in elimination of PCP from waters. One of the promising methods is the application of ferrate. Ferrate is an oxidant and coagulant. It can be applied as a multi-purpose chemical for water and wastewater treatment as it degrades a wide range of environmental pollutants. Moreover, ferrate is...
Removal of Hg(II) from aqueous solution using sodium humate as heavy metal capturing agent
An environmental friendly and economic natural biopolymer-sodium humate (HA-Na) was used to capture Hg(II) from aqueous solutions, and the trapped Hg(II) (HA-Na-Hg) was then removed by aluminium coagulation. The best Hg(II) capturing performance (90.60%) was observed under the following conditions: initial pH of 7.0, coagulation pH of 6.0, HA-Na dosage of 5.0 g L−1, Al2(SO4)3.18H2O dosage of 4.0 g L−1, initial Hg(II) concentration of 50 mg L−1 and capturing time of 30 min. The HA-Na compositions with the molecular...
Monitoring the fate of fluorescing substances recycled in ultrafiltration process backwash water
The fate of fluorescing substances during the recycling of membrane backwash water (MBWW) ahead of coagulation, flocculation and sedimentation (CFS) with ultrafiltration (UF) membranes has been investigated. Bench-scale UF membranes were used to generate MBWW from a CFS-treated surface water containing 21 mg/L dissolved organic carbon (DOC) registering a 0.95 cm–1 UV254 absorbance that had been coagulated with 100 mg/L with polyaluminum chloride. CFS settled water, when processed with UF, produced MBWW containing...