藻类－卤虫－对虾系统深度处理含盐含汞化工废水的模拟试验研究

PURIFICATION AND UNITITZATION OF SALT AND MERCURY CONTAINIG WASTEWATER FROM CHEMICAL INDUSTRY USING ALGAE-ARTEMIA-PRAWN SYSTEM

利用藻类－卤虫－对虾系统深度处理含盐含汞化工废水的模拟试验研究表明，该系统对ＢＯＤ＿５和ＣＯＤ去除率分别达９５．５％和８０．０％，对ＰＯ和Ｈｇ￣（２＋）去除率都在９８％以上，在卤虫密度５２．１个／Ｌ和３６．０个／Ｌ，藻类密度２５７２５．８万个／Ｌ和２０９２４．９万个／Ｌ，水中汞能被不同营养等级的生物累积，在水中汞浓度１．０×１０￣（－４）－３．０×１０￣（－４）ｍｇ／Ｌ范围内，藻类和卤虫对水中汞的浓缩倍数分别为７．５×１０￣２－７．８－１０￣３和２．１０×１０￣２－１．０４×１０￣４；卤虫吞食藻类，它对藻体中汞的浓缩倍数较低，变化范围在０．１－１．７之间；食染汞卤虫的对虾对汞的累积不明显。

The result of a simulation experiment on purification of salt and mercury containgwastewater using algae-artemia-prawn system showed that 95.5%and 80.8%of BOD_5 andCOD and over 98%of PO and Hg￣(2+) were removed.When artemia densities were 52.1and 36.0 ind./L with algae densities of 2.57×10￣8 and 2.09×10￣8 ind./L,the algae remov-ing ratios by artemia were 98.6%and 94.3%,respectively.The Hg in the water could beaccumulated by organisms in different nutrient levels. When the concentraltion of Hg was1.0×10￣(-4) to 3.0×10￣2mg/L, the concentration factors in algae and artemia were 7. 5×10￣2to 7.8×10￣3 and 2.1×10￣2 to 1.04× 10￣4.The Hg concentration factor in artemia was ratherlow,being 0.1─1.7.No evident of Hg accumulation in prawn was found.