【摘要】 通过化学沉淀法去除废纸造纸废水中的钙离子，比较了7种投药方案的除钙性能并优化药剂投加量，结果表明，方案7中Na₂CO₃+NaOH的投加模式除钙效果最好，既满足企业要求的钙离子降至300 mg/L以下，成本低于6.5元/t,还能保证处理后废水的pH为6.5～7.8。研究成果有效解决了造纸系统的钙积累产生的输水管道结垢、厌氧颗粒污泥钙化、沼气产率低等问题。更多还原

【Abstract】 This study removed calcium ions from the waste water of waste paper pulp and paper making by chemical precipitation method, compared the calcium removal performance of 7 dosing schemes and optimized the dosage of chemicals.The results show that the dosing mode of Na₂CO₃ and NaOH in Scheme 7 has the best calcium removal effect, which not only meets the enterprise′s requirement of reducing calcium ions to below 300 mg/L and the cost is less than 6.5 ￥/t, but also ensures that the pH of the treated waste water is between 6.5 and 7.8. The research results effectively solve the problems of calcium accumulation in the papermaking system, such as water pipe scaling, anaerobic granular sludge calcification and low biogas production rate, which is of great significance for the stable operation of the subsequent biochemical system.更多还原