Neutralising industrial ef?uent The problem Acidic industrial ef?uent streams from chemical plants situated around Villers Saint Paul, north of Paris, in France are delivered to the ARKEMA wastewater treatment plant for puri?cation and subsequent discharge into the River Oise. The ef?uent input is treated with milk of lime to neutralise its acid content. The ef?uent input rate is irregular (between 1500 and 3000 m³ per day) and pollu

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