摘要
煤制烯烃、煤制油、煤制天然气等新型煤化工对保障国家能源安全、适度增加油气替代、实现高效清洁利用具有重要意义。现代煤化工产生的未经处理的初级废水,其悬浮固体(SS)和总溶解固体(TDS)可达到500~5 000 mg/L,氨氮和化学需氧量(COD)浓度相对较低。经处理后所剩高含盐废水接近饱和,其TDS可达80 000 mg/L以上,已达膜处理的极限,无法达标排放,一般进行蒸发处理。系统分析阐述了煤化工高含盐废水的来源、特征以及目前国内外主要采取的4种蒸发处理技术,并对相关工艺进行简要阐述,分析和整理了不同处理技术方法的优缺点。
New type coal chemical industry,including coal-to-olefin,coal-to-oil,and coal-to-natural gas,is important to the safety of national energy and resource,the modest increase in gas-oil alternative,and the efficient and eco-friendly use of energy and resource. The recent coal chemical industry produces untreated wastewater with soilds,ammonia nitrogen and chemical oxygen( COD). The value of suspended solids( SS) and total dissolved solids( TDS) in wastewater can reach to500 to 5000 mg / L,whereas values of ammonia nitrogen and COD are relatively low. After treatment,the remaining wastewater with high salinity is close to saturation,where TDS is over 80 000 mg / L and higher than the limitation of membrane treatment.Thus,it could not be disposed directly into environment according to the standard. Instead,it is often treated by evaporating.This paper explains the source and the main characteristics of high salinity wastewater in coal chemical industry,as well as four evaporation technologies both in China and other countries. In addition to the description of processes of these four technologies,this paper also analysises and compares their advantages and disadvantages.
出处
《环境工程》
CAS
CSCD
北大核心
2016年第S1期432-436,共5页
Environmental Engineering
基金
神华集团公司2014年科技创新项目(SHJT-14-20)
关键词
煤化工
高含盐废水
蒸发处理
coal chemical industry
high salinity wastewater
evaporation treatment
