Avista Technologies formulates a variety of liquid coagulant/flocculant chemicals under the RoQuest® name. RoQuest® 3000 is an organic polymer while the RoQuest® 4000, 5000, and 6000 are a blend of organic coagulants and ferric sulfate.
RoQuest® formulations change the behavior of particles and colloids which normally exhibit negative charges in naturally occurring feed waters. Because like charges repel each other and unlike charges attract each other, the addition of the positively charged RoQuest® polymer allows the negatively charged particles to clump together. This creates larger particles which are more readily retained in the multimedia filter (MMF), resulting in improved MMF filtration.
Studies have proven that MMF performance without coagulant addition will remove approximately 35% - 50% of the feedwater particulates. A nominal dosage of a RoQuest® coagulant may allow the MMF to remove up to 98% of the particulates, resulting in improved effluent turbidity and reduced SDI values. The resulting improvement in filtrate quality positively effects the downstream filtration equipment including reduced cleaning frequencies and longer system run times of membrane systems.
Individual product datasheets for particular properties and application notes for each product. Technical support section which provides information on how coagulants work, a guide to selecting and optimising coagulant dosing.
The Avista Advisor 3 software is also available to allow you to estimate your required coagulant dose. Jar testing and pilot filtration study services are available, to confirm product effectiveness and dose rates.
Avista Technologies can carry out laboratory jar test studies to compare the relative effectiveness of the coagulants using particle counting and turbidity measurements or SDI. Pilot filters are available to allow side by side trials with various products.
Product approvals have been granted by water regulators, membrane manufactuers and industry bodies. Please contact your local representative for up to date information.
