RoQuest™
Avista™ RoQuest™ coagulants are membrane compatible and improve the efficiency of multimedia filtration (MMF) equipment. Studies show that MMF equipment without coagulant addition will remove approximately 35%-50% of particulates. A nominal dosage of a RoQuest coagulant may allow MMF equipment to remove over 97% of particulates.
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All products are color coded for easy identification:
GLOBAL PRODUCTS
REGIONAL PRODUCTS
Coagulant|Global|RoQuest
RoQuest™ 3000
RoQuest™ 3000 is a liquid coagulant which contains a proprietary blend of organic polymers that is injected into the feedstream of multimedia and sand filters.
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Coagulant|Regional|RoQuest
RoQuest™ 4000
RoQuest™ 4000 liquid coagulant is an organic polymer and ferric sulfate blend used to enhance the removal of a broad spectrum of inorganic particulates, organics, silt, and colloids in multimedia filters.
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Coagulant|Regional|RoQuest
RoQuest™ 6000
RoQuest™ 6000 is a liquid blend of dual organic coagulants and ferric sulfate used to reduce turbidity and remove humic and fulvic acids in multimedia filters.
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Technical Support
Avista technical support helps to provide a thorough evaluation and diagnosis of site-specific challenges. This analysis results in a clear strategy to solve customer issues and properly apply the right chemicals. Once Avista chemicals are applied, ongoing data normalization is used to validate chemical performance and set cleaning procedures.
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Resources
Scale Inhibitors
Scaling within reverse osmosis (RO) systems is a serious matter. Not only does scaling drastically reduce system performance, but the abrasive scale deposits may also cause irreversible damage to the rejecting membrane surfaces.
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Cleaning Spiral Wound Membranes
All reverse osmosis (RO) systems foul over time. Symptoms of fouling include a decrease in normalized permeate flow, an increase in salt passage, or an increase in differential pressure.
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The Role of Coagulants in Reducing Colloidal Fouling
Micromedia filtration (MMF) is the most economical means of removing colloids from within reverse osmosis (RO) feedwater. However, to be effective, in-line coagulation is required upstream of the filters. With coagulation, colloid removal rates of 95% to 99% are typical.
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