给水处理工艺铊超标原因分析及控制方法探究  

Cause of Standard-exceeding of Thallium in Water Supply Treatment Process and Its Control Method

作　　者：张晓娜 何嘉莉 莫婉湫 巢猛 ZHANG Xiao-na;HE Jia-li;MO Wan-qiu;CHAO Meng(Dongguan Water Group Water Supply Co.Ltd.,Dongguan 523112,China)

机构地区：[1]东莞市水务集团供水有限公司,广东东莞523112

出　　处：《中国给水排水》2020年第21期35-41,共7页China Water & Wastewater

摘　　要：通过设计规模为120 m3/d的某中试发现,给水处理工艺中会出现清水池出水铊升高的现象,经分析发现,原因是砂滤料表面的锰氧化物富集重金属铊,滤池反冲洗过程导致滤料表面锰氧化物脱落,进入清水池。当水源水质发生变化时,水体中芳香性蛋白质类物质和溶解性微生物代谢产物类物质等荧光溶解性有机物浓度升高,这些有机物与清水池底泥中的重金属铊发生络合反应,从而导致清水池出水铊浓度升高。高锰酸钾、单过硫酸氢钾、二氧化氯以及次氯酸钠预氧化技术不能达到控制铊污染的效果。通过修复试验发现,采用酒石酸、丙二酸、柠檬酸和草酸等高浓度多元有机酸浸泡修复砂滤料后对重金属锰和铊去除效果明显;采用高浓度盐酸浸泡修复砂滤料,对重金属铊的去除效果显著;采用低浓度草酸加高浓度氯离子溶液浸泡修复砂滤料,可以显著提高对重金属铊的去除效果。In a water supply treatment process of a pilot test with a design capacity of 120 m3/d,it was found that thallium concentration in the product water of clear water tank increased.The reason was that manganese oxides on the surface of sand filter material were enriched with thallium,and the manganese oxide fell off and entered the clear water tank during the backwash process.When the water quality changed,the concentration of fluorescent dissolved organic matters(such as aromatic proteinaceous substances and soluble microbial metabolites)increased.The organic compounds could complex with thallium in the sediment of the clear water tank,resulting in an increase in the concentration of thallium.Preoxidation technologies of potassium permanganate,monopotassium persulfate,chlorine dioxide and sodium hypochlorite had no effect on controlling thallium pollution.The repair experiment indicated that high concentration multi-organic acids(such as tartaric acid,malonic acid,citric acid and oxalic acid)had obvious effects on the removal of manganese and thallium on the surface of the sand filter.High concentration hydrochloric acid had a remarkable effect on the removal of heavy metal thallium on the surface of the sand filter.Soaking treatment with low concentration oxalic acid and high concentration chloride ion solution could significantly improve the removal efficiency of heavy metal thallium.

关 键 词：锰砂 铊 原位修复 三维荧光光谱 

分 类 号：TU991[建筑科学—市政工程]