滨海砂土对可溶性油的吸附作用和影响因素研究

Absorption of Aqueous Oil by Beach Sand and Analysis of the Effective Factors

在现场自然地理、水文地质条件调查的基础上，对青岛海水浴场采集砂和海水样品进行主要物理化学性质分析，探讨吸附机理的影响因素，通过吸附试验建立砂样对可溶性油吸附的动力学方程和吸附等温线，经过批量试验确定温度、盐度和pH值对吸附量的影响。研究结果表明，砂土对可溶性油吸附的平衡吸附量为90～110mg／kg，吸附平衡时间为14～16h，符合Henry型直线等温物理吸附。对等温式进一步分析发现，当水相中可溶性油浓度低于一定数值时，不但不产生吸附，反而会使污染沙滩上的残留油分释放出来，造成二次污染。

Based on the field investigations of natural geography and hydro-geologic conditions, sand and seawater were sampled at Shilaoren Bathing Beach of Qingdao, and their major physical and chemical properties were analyzed. The kinetic equations and isotherms of aqueous oil on sand samples were obtained and the effective factors were evaluated with the distributions of temperature, salinity and pH in the coastal surface area taken into account. The results show that the equilibrium adsorbed dissolved oil was 90--110 mg/kg; the equilibrium period was 14--16 hours, and Henry type adsorption isotherm can be used to explain the process. Moreover, the sorption mechanism was believed to be physical through thermodynamic calculation. By further analysis of the isotherm, it was discovered that oil could be released from the sandy beach when the aqueous oil concentration was lower than certain values, causing secondary pollution.