INDUSTRIAL EFFLUENT
An end to problem by-products?
NeutralacSLS45 improves effluent treatment and cuts costs at Rimex Metals
T
reating effluent was a major concern for sulphate oxide. The effluent containing calcium,
the Rimex Metals Group, a specialist in aluminium and sulphate ions is then passed
metal finishing and architectural metals. through an ultrasonic reactor, altering the reaction
In the UK it traditionally used low solids content chemistry and kinetics are so that the sodium
lime suspension to treat effluent, which is oxide is formed. Epofloc L1-R is then dosed to
collected in two separate sumps, one for ensure heavy metals removal and to start the
chromic acid based and the other for phosphoric flocculation process. The effluent is them
/sulphuric based effluent. pumped to a lamella settler for separation of
By replacing the incumbent lime suspension solids and liquid, a flocculant being added en
Neutralac is free
flowing and keeps
with the high solids content of Neutralac SLS45 route. Phosphate is finally removed by
its liquid qualities
from Lhoist UK in Buxton, Rimex has made precipitation with aluminium and calcium.
considerable savings and introduced a more The results are dependant on dosage rates but
environmentally friendly product. The effluent can be as high as up to 99.7% for sulphate and Neutralac has proved to be easier to handle,
containing chrome is reduced from hexavalent heavy metals and up to 99.9% for phosphate. easier to pump and dose and it has eliminated
chromium using sodium metabisulphite, the By introducing Neutralac SLS45, reagent costs the previous blockages.”
reaction time being pH dependent and working have been reduced by as much as 20%. Neutralac SLS45 is safer to handle than caustic
more rapidly under acidic conditions. Adrian Walker, colouring plant chemist at Rimex soda and other alkali products. Its solid content
All the effluent is dosed with an aluminium is delighted with the results: “We have also means high neutralisation potential and it reacts
reagent before being neutralised with Neutralac made logistical savings because a higher quickly reducing the reagent costs. Unlike other
SLS45. This is a two step process, with the final neutralisation equivalent can be transported for lime based products, Neutralac is free flowing
pH being around 11.5, found to be the optimum less and lower storage volume is needed. In and keeps its liquid qualities, making it easy to
pH for the formation of calcium aluminium turn this minimizes our carbon footprint. re-suspend, and is low settling. ■■■
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November 2009 Water & Wastewater Treatment 47
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