Investigation Of Nonylphenol In Surface Water Of City And Study Of Pollution Control Method By Sorption

As a kind of emerging organic pollutants, nonylphenol is ubiquitous in the environment especially in natural waters with significant endocrine disrupting effects and persistent toxicity. The current study focus on investigation of the pollution situation and biological toxicity, rather on the pollution control technology. The concentration of nonylphenol in surface water and sediment in the drinking water sources of H city was investigated in this paper, and also selective removal methods were used to study the adsorption of nonylphenol on different components of sediment. Furthermore, the adsorption properties of nonylphenol on different black carbon were tested to seek theoretical basis and technical support of nonylphenol pollution control in the environment. The main conclusions are as follows:(1) Self-made MC is a new, reusable and efficient extractor for nonylphenol extraction, with strong extraction ability, fast desorption speed and completely desorption ability.(2)The concentration of nonylphenol in surface water in H city is mainly related with pollution source, ranging between 0.66-3.60 g/L, which exceed the Canadian and American water quality guideline of nonylphenol (1.00μg/L). The concentration of nonylphenol in sediments ranged between 60.09μg/kg and 2568.47μg/kg, which are lower than other reported value at home and abroad. And they are positively related to the content of organic matter in sediments (R2= 0.85).(3) Treated by different methods, the content of organic matter in sediments was changed significantly, in which fulvic and humic are removed by NaOH and fulvic, and humic acid and humin are removed by H2O2. The adsorption capacity of sediments also changed, which decrease about 30% by NaOH treatment and 50% by H2O2 treatment. The Kom of sediments treated by H2O2 is 1 to 3 times that of original samples, indicating that the adsorption capacity of organic matter in sediments treated by H2O2 is higher than that treated by NaOH.(4) Compared with fly ash black carbon (FP), rice-straw black carbon (RP) has higher sorption capacity, and they increased much after acid treatment. The adsorption isotherm fitted by Freundlich and Dual-mode showed that, the adsorption capacity of FP and RP were 411.26 mg/kg and 895.37 mg/kg, and the Freundlich linear factors n were 0.90 and 0.77, respectively. After acid treatment, the nonlinear sorption capacity had been greatly improved, with n decreased to 0.55 and 0.39, the adsorption capacity increased to 3423.65 mg/kg and43507.13 mg/kg, respectively, and which increased by 7 times and 47 times. After methanol treatment, the adsorption capacity increased to 3817.06 mg/kg and 52949.24 mg/kg, and the n values decreased to 0.32 and 0.37. This is because after acid treatment, the specific surface area and micropore of the sediments increased greatly, large number of functional groups exposed, and adsorption sites increased. After methanol treatment, the nonlinear adsorption capacity increase as micropore increased further. The rice-straw black carbon treated by acid was an excellent adsorbent in controlling nonylphenol pollution.