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Study on Remediation of Oil Polluted Shallow Groundwater Using Surfactant-enhanced Air Sparing

Author: WangTianYe
Tutor: ZhangFengJun；ZhangFuGuo
School: Jilin University
Course: Environmental Engineering
Keywords: Sparging Groundwater remediation Enhanced by Surfactants
CLC: X523
Type: Master's thesis
Year: 2011
Downloads: 91
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Abstract

Due to the rapid development of the human society, the economic and material needs to continue to expand, the demand for energy is increasing. Oil as an important strategic materials, mining and utilization continue to expand, while accompanied by the improper exploitation of the oil pipeline leaks and waste discharge a range of issues, pose a serious threat to human health, ecological environment and social stability . Therefore, the research on the repair of oil pollution of shallow groundwater has become a hot issue in the current domestic and international environmental protection. Repair technology in a large number of contaminated sites, groundwater aeration (Air sparing, AS) is considered to be the most effective method to remove volatile organic contaminants in groundwater and the vadose zone. Traditional groundwater aeration also has many drawbacks, such as the air affect the narrow area, remove less effective in inhomogeneous media, little effect of the weak volatile pollutants removal, still has not been well solution. Therefore, how to take the appropriate enhancement means, to improve the traditional sparging technology, to improve its performance and removal, to become problems to be solved. Comprehensive research status contaminated sites through a series of simulation experiments in this paper, study AS method of repair technology in a number of non-homogeneous medium and its influencing factors, including the amount of aeration and aeration; and surface The active agent to strengthen the AS method studied the mechanism, including the enhanced removal efficiency of the surfactant selection and contaminants and their associated mechanism. (1) AS influencing factors by one-dimensional soil column experiments, and the experimental results show that showed a linear adsorption: ① of benzene and naphthalene in the gravelly sand, grit, sand and silt. The smaller the particle size of the sand media, the greater the adsorption of pollutants and pollutant sorption distribution coefficient Kd greater the adsorption effect is more significant, increase application AS method of governance is difficult. ② With the increase of the amount of aeration, the pollutant removal efficiency can be improved, but it the removal effect reaches a certain limit, and then increase the amount of aeration, and does not improve the efficiency of the removal of pollutants, but will make it somewhat decline. The experiments to determine the optimum amount of aeration 300ml/min. ③ As the reason of the solubility and dissolution rate in the aeration process naphthyl exist in solid form is trapped in the bottom of the soil column, and adsorbed on the medium, AS method compared to the removal of naphthalene and benzene there is a great difference in the application of AS handling such substances to try to increase the solubility of pollutants to the water phase, and accelerate its dissolution rate, more practical significance. (2) the SEAS, the choice of surface active agent is a need of special considerations. Surfactant solubilization capacity for organic pollutants, its own adsorption and elution of organic pollutants adsorption media a comprehensive study to determine suitable underground environment due to the special nature of the underground environment, The surface active agent, and applied to the the SEAS art. Four surfactants (Tween80, Tween20, SDBS SDB), the experimental results show that: ① four surfactant solubilization capacity size of target pollutants compared solubilization capacity of benzene: Tween80 gt ; Tween20 gt; SDB gt; SDBS; the solubilization capacity: naphthalene Tween 80 gt; Tween 20 gt; the SDB gt; of SDBS. (2) the adsorption capacity of the four kinds of surface active agent in the medium sand medium as follows: of SDBS GT; Tween20-GT; Tween80, GT; SDBs; ③ surfactant eluting ability to compare the organic pollutants adsorbed on the medium of the medium sand, terephthalic elution capacity: Tween 80 gt; Tween 20 gt; of SDBS; the the elution capacity: naphthalene of SDBS gt; Tween 80 gt; Tween 20. Through the experimental results, and ultimately determine the Tween80 as the SEAS art the most suitable surface active agents, and participate in subsequent experiments. (3) the SEAS technology one-dimensional simulation of the soil column, and traditional AS law comparison, to strengthen removal of organic pollutants benzene and naphthalene compared, results showed that: ① highly volatile (Henry's constant larger) organic pollutants benzene, SEAS technology effect their removal is not superior to conventional AS Law. Accordingly, volatile organic contaminants which apply to conventional AS Removal. ② For semi-volatile (Henry constant is small), organic pollutants naphthalene AS SEAS removal of the more traditional purposes of the law, there is significantly enhanced. Therefore, for the removal of a weak volatile organic pollutants, SEAS techniques are more appropriate. Yin ③ - the mixed surfactant SEAS technology the removal of volatile organic contaminants Prior to joining the single surfactant, but not significantly superior to the traditional AS method. Yin - non-hybrid SEAS technology for semi-volatile or less volatile organic pollutants, the removal was not as good as adding a single surfactant, and also lower than the efficiency of the removal of the traditional AS.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Water pollution and its control > Groundwater
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