废纸造纸废水化学沉淀法除钙研究  

Study on the decalcification from waste paper papermaking wastewater by precipitation

作　　者：战晓慧 张辉[1] 张小红 沈海涛 史惠祥[1] 姚熠 ZHAN Xiaohui;ZHANG Hui;ZHANG Xiaohong;SHEN Haitao;SHI Huixiang;YAO Yi(College of Environmental&Resouce Sciences,Zhejiang University,Hangzhou Zhejiang 310058;Zhejiang Jingxing Paper Co.,Ltd.,Jiaxing Zhejiang 314000;Jiaxing Environmental Science Research Institute Co.,Ltd.,Jiaxing Zhejiang 314000)

机构地区：[1]浙江大学环境与资源学院,浙江杭州310058 [2]浙江景兴纸业股份有限公司,浙江嘉兴314000 [3]嘉兴市环境科学研究所有限公司,浙江嘉兴314000

出　　处：《环境污染与防治》2020年第12期1484-1490,共7页Environmental Pollution & Control

基　　金：国家水体污染控制与治理科技重大专项(No.2017ZX07206-002);嘉兴市科技计划项目(No.2017AY33092)。

摘　　要：调研分析两家典型的废纸造纸企业废水处理系统的工艺和水质,利用朗格利尔指数和CaSO 4饱和指数分析结垢情况,可知两家企业中水系统的进水均易形成CaCO 3沉淀,不易形成CaSO 4沉淀。比较3种投药方案(方案1:投加Na 2CO 3;方案2:投加Ca(OH)2+Na 2CO 3;方案3:投加NaOH)的除钙性能,优化药剂投加量。结果表明,针对实际废水,方案1至方案3的最佳投加量为848 mg/L Na 2CO 3、666 mg/L Ca(OH)2+106 mg/L Na 2CO 3、360 mg/L NaOH。通过对比碳酸盐消耗量和Ca^2+去除量可判断,方案1、3的主要沉淀产物为CaCO 3,方案2的沉淀产物为CaCO 3和Ca 2(OH)2CO 3。Based on the investigation and analysis of the process and water quality of the wastewater treatment system of two typical waste paper papermaking enterprises,and the analysis of scale formation by Langley index and CaSO 4 saturation index,it could be seen that the inflow of the water system of the two enterprises trended to form CaCO 3 precipitation instead of CaSO 4 precipitation.The removal performance of Ca^2+by three dosing schemes(scheme 1:Na 2CO 3;scheme 2:Ca(OH)2+Na 2CO 3;scheme 3:NaOH)was compared,and the dosage was optimized.The optimal dosage for actual wastewater was 848 mg/L Na 2CO 3,666 mg/L Ca(OH)2+106 mg/L Na 2CO 3,360 mg/L NaOH.By comparing the consumption of carbonate and the removal of Ca^2+,the composition of precipitated products was preliminarily determined.The results showed that the precipitated products of scheme 1 and scheme 3 were CaCO 3 and scheme 2 were CaCO 3 and Ca 2(OH)2CO 3.

关 键 词：废纸造纸 除钙 化学沉淀 工艺研究 

分 类 号：X793[环境科学与工程—环境工程]