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With the rapid development of economy in our country, the demand of cold rolled steel plate products is increased continuously and wastewater containing thin oil has become one of the main types of wastewater in iron and steel enterprises. It is crucial for reaching the standard of environmental protection and recycle of water resource in enterprises to efficiently and stably treat the wastewater containing thin oil. In the paper, the removal effect and operating characteristics of chemical oxygen demand (COD) in each process section are systematically analyzed through the data of over 700 water quality tests in one year based on the combination process of neutralization-coagulation flocculation-air flotation-bioactive sludge by taking the treatment system of wastewater containing thin oil in Cold Rolled Rare Earth Steel Plate Plant of Baotou Steel as research object. The results showed that the average removal rate of COD in pretreatment unit of flocculation-air flotation could reach 75.24% so that degradable organics could be efficiently removed; recalcitrant wastewater was further degraded with biological system and the COD of final effluent was stably lower than 70 mg/L. The study could provide data supports and practical references for stable operations, process optimization as well as operation and maintenance control of system of wastewater containing thin oil in cold rolling.

, authors=Jian Qiao, authorsList=Jian Qiao, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1294717630737309854, articleId=1294717628753404060, tenantId=1146029695717560320, journalId=1185652524569653253, language=CN, title=包钢冷轧稀油废水生物活性污泥系统运行研究, columnId=1185882040642716431, journalTitle=稀土钢, columnName=其他, runingTitle=null, highlight=null, articleAbstract=

随着我国经济快速发展，冷轧钢板产品需求持续增长，稀油废水已成为钢铁企业主要废水类型之一。高效稳定处理含稀油废水对企业环保达标与水资源循环利用至关重要。文章以包钢稀土钢冷轧板材厂稀油废水处理系统为研究对象，基于中和—混凝絮凝—气浮—生物活性污泥组合工艺，通过为期1年、700余次水质化验数据，系统分析各工艺段COD去除效果与运行特征。结果表明：絮凝气浮预处理单元COD平均去除率达75.24%，可高效去除易降解有机物；生物系统进一步降解难降解物质，最终外排水COD稳定低于70 mg/L。本研究可为冷轧稀油废水系统稳定运行、工艺优化与运维管控提供数据支撑与实践参考。

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乔健（1987-），男，辽宁省海城市人，硕士，工程师，现从事冷轧生产运行保障技术工作。

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乔健（1987-），男，辽宁省海城市人，硕士，工程师，现从事冷轧生产运行保障技术工作。

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