The Research Of Emergent Dispose For Organic Liquid Spills By Modified Bentonites

In the past few years, the widespread occurrence of organic liquid spill not only put large numbers of the public in the danger of exposure to organic pollutants, but also caused serious damages to the local ecological environment. So, the rapid elimination of the impact and quantity of organic liquid spill has become an important research topic. Studies have shown that the use of retention agent is a reliable and effective emergency treatment in the disposal of organic liquid spill. Typical organic liquid (benzene, chlorobenzene, nitrobenzene and diesel) were chosen as representative pollutants in this research. The retention capacity of organic liquid onto a series of modified bentonites and their mechanisms were investigated in this paper. Then a pilot-scale simulated experiment was conducted to provide the basis for the modified bentonites used in emergency treatment for a large -scale leakage of organic liquid.Results indicated that the retention capacity of modified bentonites for organic liquid (2.64-9.01 g/g) was much higher than that of conventional retention agents (0.28-1.17 g/g). The property of surfactants used as modifier impose a siginificant influence on the retention capacity of the modified bentonites, and CTMAB modified bentonites exhibited the highest efficiency in the sequestration of organic pollutants as compared to bentonites modified with DTMAB and TTAB. The surfactants used and their amounts had a significant influence on the retention capacity of modified bentonites, and bentonites synthesized by cetyltrimethylammonium (CTMAB) with a quantity of 100% CEC showed the highest efficiency in the retention of organic liquid. Meanwhile, results indicated that modifications by surfactants enhanced the hydrophobicity and interlayer spacing of the modified bentonites, making their retention capacities of organic liquid improved.Retention rate of organic liquid onto CTMAB-bentonite had a good linear relation with dosage ratio in the range of 0-250 g/L, and the best action time is 5 min. Pilot study tested the feasibility of emergency retention of liquid organic onto modified bentonites. In the simulated experiment, organic liquid could be retained effectively by retention emergency device with modified bentonites within 15 min, and the retention rate was over 80%, which shows a bright future in application.