Mixture based on peracetic acid and hydrogen peroxide is a more powerful oxidant than chlorine and chlorine dioxide. The reactivity of this oxidizing mixture with the polluting substances in the water: ammonium compounds, nitrites, iron, manganese, organic proteins is evaluated in this study. The results obtained after tasting this mixture, using various natural groundwater matrices shows an oxidation efficiency of over 90% of ammonium and nitrite content, between 40-70% of iron and 25-50% for manganese forms. The advantage of this oxidation mixture compared to thechlorine substances is that they do not form threehalomethane byproducts that have carcinogenic effect.
The assurance of the protection for the delivered drinking water against the secondary pathogenic increases in the distribution network will become a prime importance target for water treatment plants. In the waterworks there are used the multi barrier concept, and each treatment step will have to be optimized to obtain a maximum reduction of the compounds which are a health hazard to consumers. The optimization of the coagulation flocculation process in order to obtain an advanced reducing of suspensions, organic substances and microbiological constituents has a positive effect on the other technological phases such as decantation, filtration, disinfection, ensuring the risk reduction of bacterial growth in the distribution network.
Flocculants are chemicals that speed up the aggregation of destabilized particles by increasing the efficiency of their removal. Due to the impact that residual substances which are found in water treatment reagents has on consumers' health, replacing polyacrylamide flocculants has become a priority. In order to address this issue, a polysilicate type flocculant was evaluated in two steps. The first step was performed in laboratory conditions, on raw surface water, along with four types of coagulants: aluminium-sulfate, two different types of polyaluminum-chloride-hydroxide, and polyaluminum-chloride-hydroxydesulfate, which is a bi-component coagulant. The second step consisted of studies performed at an industrial level. During these studies, the polysilicate and the polyacrylamide type flocculants were compared, in combination with the polyaluminum-chloride-sulfate type coagulant. The purpose of these studies was to determine which one yielded better results, in terms of reducing turbidity and organic carbon deposits (TOC, DOC, BDOC) contained within raw surface water. The results obtained through these studies clearly showed that for potable water treatment, the polysilicate type flocculant was a superior replacement to the polyacrylamide type.
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