The industrial wastewater from a company in Beijing has a total hardness of 533 mg/L(as CaCO3),a calcium hardness of 316 mg/L(as CaCO3),and a total alkalinity of 262 mg/L.Experiments were carried out using lime-soda ash method and double-alkali method respectively.The results indicated that,at room temperature(25 ℃),the optimal treatment efficiency for the lime-soda ash method was achieved with a lime dosage of 0.55 g/L and a soda ash dosage of 0.4 g/L.Moreover,for the double-alkali method,the optimal efficiency was attained with a sodium hydroxide dosage of 0.4 g/L and a soda ash dosage of 0.06 g/L.Both methods achieved hardness removal rates exceeding 85％.However,the double alkali method requires less reagent,thus offering greater economic benefits.
关键词
高硬度废水/石灰纯碱法/双碱法/烧杯实验/药剂最佳用量
Key words
high hardness wastewater/lime soda method/double alkali method/beaker experiment/optimum dosage of medicament
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